1

                                                                    Exhibit 10.5



                   THIRD AMENDMENT AND MODIFICATION AGREEMENT


     THIRD AMENDMENT AND MODIFICATION AGREEMENT dated as of September 14, 1998
(this "Amendment") by and among HADCO CORPORATION, a Massachusetts corporation
(the "Borrower"); the direct and indirect subsidiaries of the Borrower listed on
the signature pages hereto (collectively, the "Guarantors"); BANKBOSTON, N.A.,
AS AGENT (the "Agent") and BANKBOSTON, N.A., individually, and the other lending
institutions (collectively, the "Banks") listed on SCHEDULE 1 to the Amended and
Restated Revolving Credit Agreement dated as of December 8, 1997 (as amended and
in effect from time to time, the "Credit Agreement") among the Borrower, the
Banks and the Agent. Terms not otherwise defined herein which are defined in the
Credit Agreement shall have the respective meanings assigned to such terms in
the Credit Agreement, as amended hereby.

     WHEREAS, the Borrower has requested that the Agent and the Banks amend
certain provisions of the Credit Agreement; and

     WHEREAS, upon the terms and subject to the conditions contained herein, the
Agent and the Banks are willing to amend such provisions of the Credit
Agreement;

     NOW, THEREFORE, in consideration of the mutual agreements contained in the
Credit Agreement, the other Loan Documents and this Amendment and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby agree as follows:

     ss.1. AMENDMENT OF ss.1.1 OF THE CREDIT AGREEMENT. Section 1.1 of the
Credit Agreement is hereby amended by:


                    (a)  inserting the following new definitions in the order
     required by alphabetical order:

          "ACCOUNTS RECEIVABLE. All rights of the Borrower or any of the
     Guarantors to payment for goods sold, leased or otherwise marketed in the
     ordinary course of business and all rights of the Borrower or any of the
     Guarantors to payment for services rendered in the ordinary course of
     business and all sums of money or other proceeds due thereon pursuant to
     transactions with account debtors, except for that portion of the sum of
     money or other proceeds due thereon that relate to sales, use or property
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     taxes in conjunction with such transactions, recorded on books of account
     in accordance with generally accepted accounting principles."

          "AGENCY ACCOUNT AGREEMENTS. See ss.8.17.1."

          "APPLICABLE BASE RATE USAGE FEE MARGIN. For any fiscal quarter or
     portion thereof, one-half of one percent (0.50%) per annum; PROVIDED,
     HOWEVER, that in the event that the ratio of Consolidated Funded Debt
     (calculated as of the last day of such fiscal quarter or portion thereof)
     to EBITDA (calculated for the four fiscal quarters ending on the last day
     of such fiscal quarter or portion thereof and, in connection with any
     Permitted Acquisition of a Target pursuant to ss.9.5.2(b), including, if
     and to the extent approved in writing by the Majority Banks, EBITDA of such
     Target on a PRO FORMA basis) meets the requirements set forth in the chart
     below, the Applicable Base Rate Usage Fee Margin shall, commencing with
     (but not before) the date (the "Base Rate Usage Fee Margin Adjustment
     Commencement Date") which is ten (10) days after the date on which the
     Borrower delivers to the Banks the financial statements referred to in
     ss.8.4(a) or (b) for such fiscal quarter or portion thereof and ending with
     the date (the "Base Rate Usage Fee Margin Adjustment Termination Date")
     which is nine (9) days after the next date on which the Borrower delivers
     to each of the Banks the financial statements referred to in ss.8.4(a) or
     (b), be the percentage set forth opposite the applicable ratio of
     Consolidated Funded Debt to EBITDA in the table below; PROVIDED, HOWEVER,
     that in connection with any Permitted Acquisition pursuant to ss.9.5.2(b),
     the next Base Rate Usage Fee Margin Adjustment Termination Date shall be
     deemed to be one day prior to the Permitted Acquisition Funding Date for
     such Permitted Acquisition, and the next Base Rate Usage Fee Margin
     Adjustment Commencement Date (with the Applicable Base Rate Usage Fee
     Margin to be based upon the ratio contained in the Permitted Acquisition
     Ratio Compliance Certificate for such Permitted Acquisition) shall be the
     Permitted Acquisition Funding Date for such Permitted Acquisition:


     Ratio of Consolidated Funded                            Applicable Base
            Debt to EBITDA                                Rate Usage Fee Margin
            --------------                                ---------------------

     Greater than or equal to 3.5:1.0                             0.50%
     Greater than or equal to 3.0:1.0                             0.25%
     but less than 3.5:1.0
     Less than 3.0:1.0                                            0.0%

     If any financial statements referred to above are not delivered within the
     time periods specified in ss.8.4(a) or, as the case may be, ss.8.4(b),
     then, until such financial statements are delivered, the Applicable Base
     Rate Usage Fee Margin as at the end of the fiscal period that would have
     been covered thereby shall, for the purposes of this definition, be deemed
     to be 

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     0.50%. In addition, at all times while a Default or Event of Default shall
     have occurred and be continuing, the Applicable Base Rate Usage Fee Margin
     shall, for the purposes of this definition, be deemed to be 0.50%."

                    (b)  amending the definition of "Applicable Commitment Fee
     Percentage" by inserting, immediately after the text "to EBITDA (calculated
     for the four fiscal quarters ending on the last day of such fiscal quarter
     or portion thereof" and immediately before the text ") meets the
     requirements set forth in the chart below," the text: "and, in connection
     with any Permitted Acquisition of a Target pursuant to ss.9.5.2(b),
     including, if and to the extent approved in writing by the Majority Banks,
     EBITDA of such Target on a PRO FORMA basis".

                    (c)  amending the definition of "Applicable Eurodollar Rate
     Margin" by inserting, immediately after the text "to EBITDA (calculated for
     the four fiscal quarters ending on the last day of such fiscal quarter or
     portion thereof" and immediately before the text ") meets the requirements
     set forth in the chart below," the text: "and, in connection with any
     Permitted Acquisition of a Target pursuant to ss.9.5.2(b), including, if
     and to the extent approved in writing by the Majority Banks, EBITDA of such
     Target on a PRO FORMA basis".

                    (d)  inserting the following new definition in the order
     required by alphabetical order:

          "APPLICABLE EURODOLLAR RATE USAGE FEE MARGIN. For any fiscal quarter
     or portion thereof, three-quarters of one percent (0.75%) per annum;
     PROVIDED, HOWEVER, that in the event that the ratio of Consolidated Funded
     Debt (calculated as of the last day of such fiscal quarter or portion
     thereof) to EBITDA (calculated for the four fiscal quarters ending on the
     last day of such fiscal quarter or portion thereof and, in connection with
     any Permitted Acquisition of a Target pursuant to ss.9.5.2(b), including,
     if and to the extent approved in writing by the Majority Banks, EBITDA of
     such Target on a PRO FORMA basis) meets the requirements set forth in the
     chart below, the Applicable Eurodollar Rate Usage Fee Margin shall,
     commencing with (but not before) the date (the "Eurodollar Rate Usage Fee
     Margin Adjustment Commencement Date") which is ten (10) days after the date
     on which the Borrower delivers to the Banks the financial statements
     referred to in ss.8.4(a) or (b) for such fiscal quarter or portion thereof
     and ending with the date (the "Eurodollar Rate Usage Fee Margin Adjustment
     Termination Date") which is nine (9) days after the next date on which the
     Borrower delivers to each of the Banks the financial statements referred to
     in ss.8.4(a) or (b), be the percentage set forth opposite the applicable
     ratio of Consolidated Funded Debt to EBITDA in the table below; PROVIDED,
     HOWEVER, that in connection with any Permitted Acquisition pursuant to
     ss.9.5.2(b), the next Eurodollar Rate Usage Fee Margin Adjustment
     Termination Date shall be deemed to be one day prior to the Permitted
     Acquisition Funding Date 

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                                      -4-


     for such Permitted Acquisition, and the next Eurodollar Rate Usage Fee
     Margin Adjustment Commencement Date (with the Applicable Eurodollar Rate
     Usage Fee Margin to be based upon the ratio contained in the Permitted
     Acquisition Ratio Compliance Certificate for such Permitted Acquisition)
     shall be the Permitted Acquisition Funding Date for such Permitted
     Acquisition:


     Ratio of Consolidated Funded                         Applicable Eurodollar
            Debt to EBITDA                                Rate Usage Fee Margin
            --------------                                ---------------------

     Greater than or equal to 2.0:1.0                            0.750%
     Less than 2.0:1.0                                           0.625%

     If any financial statements referred to above are not delivered within the
     time periods specified in ss.8.4(a) or, as the case may be, ss.8.4(b),
     then, until such financial statements are delivered, the Applicable
     Eurodollar Rate Usage Fee Margin as at the end of the fiscal period that
     would have been covered thereby shall, for the purposes of this definition,
     be deemed to be 0.75%. In addition, at all times while a Default or Event
     of Default shall have occurred and be continuing, the Applicable Eurodollar
     Rate Usage Fee Margin shall, for the purposes of this definition, be deemed
     to be 0.75%."

                    (e)  deleting the definition of "Balance Sheet Date" in its
     entirety and substituting in lieu thereof the following definition:

          "BALANCE SHEET DATE. October 25, 1997."

                    (f)  inserting, in the order required by alphabetical order,
     the following new definitions:

          "BKB CONCENTRATION ACCOUNT. See ss.8.17.1. "

          "BORROWER STOCK PLEDGE AGREEMENT. The Stock Pledge Agreement dated or
     to be dated on or prior to the Third Amendment Effective Date between the
     Borrower and the Agent and in form and substance satisfactory to the Agent
     and the Banks."

          "BORROWING BASE. At the relevant time of reference thereto, an amount
     determined by the Agent by reference to the most recent Borrowing Base
     Report, commercial finance and collateral audit reports delivered by the
     Borrower to the Agent pursuant to ss.2.10, the most recent appraisal of the
     Eligible Fixed Assets delivered to the Banks and the Agent pursuant to
     ss.8.4(f) and other information obtained by or provided to the Agent, as
     adjusted pursuant to the provisions below, which is equal to the sum of:

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                                      -5-


          (a) 85% of Eligible Accounts Receivable for which invoices have been
     issued and are payable; PLUS

          (b) 70% of Eligible Foreign Accounts Receivable for which invoices
     have been issued and are payable; PLUS

          (c) 40% of the net book value (determined on a first-in first-out
     basis at the lower of cost or market) of Eligible Inventory; PLUS     

          (d) a percentage to be determined from time to time by the Agent in
     its sole discretion (but not to exceed, in any event, 40%) of the net book
     value (determined on a first-in, first-out basis at the lower of cost or
     market) of Eligible Foreign Inventory; PLUS

          (e) 45% of the Determined Value of Eligible Fixed Assets; MINUS

          (f) Reserves; MINUS

          (g) The aggregate amount of the outstanding obligations of the
     Borrower in respect of the "UDC ERA" and the UDC REDPP" obligations
     referenced on SCHEDULE 9.1.

     The Agent may, in its commercially reasonable discretion (except with
     respect to modification of the lending formula with respect to Eligible
     Foreign Inventory, which modification shall be in the Agent's sole
     discretion and for the benefit of the Banks), from time to time, upon
     fifteen (15) days' prior notice to the Borrower, (x) reduce the lending
     formula with respect to Eligible Accounts Receivable or Eligible Foreign
     Accounts Receivable to the extent that the Agent determines that: (i) the
     dilution with respect to the Accounts Receivable for any period has
     increased in any material respect or may be reasonably anticipated to
     increase in any material respect above historical levels, or (ii) the
     general creditworthiness of account debtors or other obligors of the
     Borrower or any Guarantor has materially declined or (y) reduce the lending
     formula(s) with respect to Eligible Inventory, Eligible Foreign Inventory
     or, as the case may be, Eligible Fixed Assets, to the extent that the Agent
     determines that: (i) the number of days of the turnover of the inventory of
     the Borrower or any Guarantor for any period has changed in any material
     adverse respect, (ii) the liquidation value of the Eligible Fixed Assets
     or, as the case may be, the Eligible Inventory or Eligible Foreign
     Inventory, or any category thereof, has materially decreased, or (iii) the
     nature and quality of the inventory of the Borrower or any Guarantor or, as
     the case may be, of the assets comprised in Eligible Fixed Assets, has
     deteriorated in any material respect or the mix of such inventory has
     changed materially. In determining whether to reduce the lending
     formula(s), the Agent may consider events, conditions, contingencies or
     risks which are also considered in determining Eligible Accounts
     Receivable, Eligible Foreign Accounts Receivable, Eligible Inventory,

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                                      -6-


     Eligible Foreign Inventory or Eligible Fixed Assets or in establishing the
     Reserves."

          "BORROWING BASE REPORT. A Borrowing Base Report signed by the
     treasurer or chief financial officer of the Borrower and in substantially
     the form of EXHIBIT F hereto."

          (g) deleting the definition of CCIR International in its entirety and
     substituting in lieu thereof the following new definition:

               "CCIR INTERNATIONAL. Continental Circuits International, Inc., a
          Barbados corporation."

          (h) deleting the comma (",") immediately before the word "Corp. " in
     the definition of "CCIR of California" and in the definition of "CCIR of
     Texas."

          (i) inserting the following new definitions in the order required by
     alphabetical order:

          "COLLATERAL. All of the property, rights and interests of the Borrower
     and the Guarantors that are or are intended to be subject to the security
     interests and mortgages created by the Security Documents."

          "DETERMINED VALUE. At the relevant time of reference thereto, the
     lesser of (i) the net book value of Eligible Fixed Assets, determined in
     accordance with generally accepted accounting principles, and (ii) the
     appraised value of such assets on an orderly liquidation basis determined
     by the most recent appraisal thereof conducted pursuant to ss.8.4(f);
     PROVIDED that, until the first appraisal has been completed pursuant to
     ss.8.4(f), the Determined Value of Eligible Fixed Assets shall be the net
     book value of such assets as of the Third Amendment Effective Date,
     determined in accordance with generally accepted accounting principles. To
     the extent that any Eligible Fixed Asset is encumbered by a lien or
     encumbrance which is a Permitted Lien not securing the Obligations, the
     amount of the Indebtedness secured by such lien or encumbrance shall be
     deducted from the value determined in accordance with the immediately
     preceding sentence of this definition of the term "Determined Value"."

          "DYNAFLEX. A corporation (i) to be named Dynaflex, Inc. or a name of
     reasonably similar description and (ii) to be incorporated under the laws
     of the State of Delaware in connection with the Restructuring Transaction
     as a wholly owned Subsidiary of Hadco Santa Clara."

          "ELIGIBLE ACCOUNTS RECEIVABLE. The aggregate of the unpaid portions of
     Accounts Receivable (net of any credits, rebates, offsets, holdbacks or
     other adjustments or commissions payable to third parties that are
     adjustments to such Accounts Receivable) (i) that the Borrower 

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                                      -7-


     reasonably and in good faith determines to be collectible and not in
     dispute; (ii) that are with account debtors or other obligors that (A) are
     not Affiliates of the Borrower, (B) are not the United States government or
     any agency or instrumentality thereof unless the Borrower shall have
     complied, upon the Agent's request therefor, with all requirements and
     procedures of the federal Assignment of Claims Act to the satisfaction of
     the Agent, (C) purchased the goods or services giving rise to the relevant
     Account Receivable in an arm's length transaction, (D) are not insolvent or
     involved in any case or proceeding, whether voluntary or involuntary, under
     any bankruptcy, reorganization, arrangement, insolvency, adjustment of
     debt, dissolution, liquidation or similar law of any jurisdiction and (E)
     are, in the Agent's reasonable judgment, creditworthy; (iii) that are in
     payment of obligations that have been fully performed, do not consist of
     progress billings or bill and hold invoices and are not subject to dispute
     or any other similar claims that would reduce the cash amount payable
     therefor; (iv) that are not subject to any pledge, restriction, security
     interest or other lien or encumbrance other than those created by the Loan
     Documents; (v) in which the Agent, for the benefit of the Banks and the
     Agent, has a valid and perfected first priority security interest; (vi)
     that are not outstanding for more than ninety (90) days past the earlier to
     occur of (A) the date of the respective invoices therefor and (B) the date
     of shipment thereof in the case of goods or the end of the calendar month
     following the provision thereof in the case of services; (vii) that are not
     due from an account debtor or other obligor located in Minnesota or any
     other jurisdiction in which a failure to receive a certificate of authority
     to do business is not subject to subsequent cure unless the Borrower or the
     applicable Guarantor (A) has received a certificate of authority to do
     business and is in good standing in such state or (B) has filed a notice of
     business activities report with the appropriate office or agency of such
     state for the current year; (viii) that are not due from any single account
     debtor or other obligor if more than fifteen percent (15%) of the aggregate
     amount of all Accounts Receivable owing from such account debtor or other
     obligor would otherwise not be Eligible Accounts Receivable; (ix) that are
     payable in Dollars; (x) that are not payable from an office outside of the
     United States; and (xi) that are not secured by a letter of credit unless
     the Agent has a prior, perfected security interest in such letter of
     credit. General criteria for Eligible Accounts Receivable may be
     established and revised for the benefit of the Banks from time to time by
     the Agent in the exercise of its commercially reasonable discretion."

          "ELIGIBLE FIXED ASSETS. Those fixed assets (excluding all leaseholds)
     owned by the Borrower or any of the Guarantors at the relevant time of
     reference thereto, which are properly insured in accordance with the
     provisions of ss.8.7, (a) which are not subject to any pledge, restriction,
     security interest or other lien or encumbrance other than those created by
     the Loan Documents or, in the case of fixed assets 

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     consisting of Real Estate, Permitted Liens, and (b) in which the Agent, for
     the benefit of itself and the Banks, has a properly perfected first
     priority security interest or mortgage lien; PROVIDED, HOWEVER, that for
     the period from the Third Amendment Effective Date through and including
     October 26, 1998, Real Estate which would otherwise constitute Eligible
     Fixed Assets shall be considered to be Eligible Fixed Assets even if the
     Agent does not have a properly perfected first priority mortgage lien
     thereon; and PROVIDED FURTHER that equipment located at the Borrower's
     facility in Owego, New York and subject to the lease arrangements described
     on SCHEDULE 9.1 as "UDC ERA" and "UDC REDPP", which would otherwise be
     considered Eligible Fixed Assets, shall be considered Eligible Fixed Assets
     notwithstanding the interest of the Tioga County Industrial Development
     Agency therein pursuant to such lease arrangements. General criteria for
     Eligible Fixed Assets may be established and revised for the benefit of the
     Banks from time to time by the Agent in the exercise of its commercially
     reasonable discretion."

          "ELIGIBLE FOREIGN ACCOUNTS RECEIVABLE. The aggregate of the unpaid
     portions of Accounts Receivable (net of any credits, rebates, offsets,
     holdbacks, withholding taxes or other adjustments or commissions payable to
     third parties that are adjustments to such Accounts Receivable) (i) that
     the Borrower reasonably and in good faith determines to be collectible and
     not in dispute; (ii) that are with account debtors or other obligors that
     (A) are not Affiliates of the Borrower, (B) purchased the goods or services
     giving rise to the relevant Account Receivable in an arm's length
     transaction, (C) are not insolvent or involved in any case or proceeding,
     whether voluntary or involuntary, under any bankruptcy, reorganization,
     arrangement, insolvency, adjustment of debt, dissolution, liquidation or
     similar law of any jurisdiction and (D) are, in the Agent's reasonable
     judgment, creditworthy; (iii) that are in payment of obligations that have
     been fully performed, do not consist of progress billings or bill and hold
     invoices and are not subject to dispute or any other similar claims that
     would reduce the cash amount payable therefor; (iv) that are not subject to
     any pledge, restriction, security interest or other lien or encumbrance
     other than those created by the Loan Documents; (v) in which the Agent, for
     the benefit of the Banks and the Agent, has a valid and perfected first
     priority security interest; (vi) that are not outstanding for more than
     ninety (90) days past the earlier to occur of (A) the date of the
     respective invoices therefor and (B) the date of shipment thereof in the
     case of goods or the end of the calendar month following the provision
     thereof in the case of services; (vii) that are not due from any single
     account debtor or other obligor if more than fifteen percent (15%) of the
     aggregate amount of all Accounts Receivable owing from such account debtor
     or other obligor would otherwise not be Eligible Foreign Accounts
     Receivable; (viii) that are payable in Dollars by a Subsidiary of a
     corporation or other entity incorporated or organized under the laws of a
     state of the United 

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                                      -9-


     States of America or of the District of Columbia. General criteria for
     Eligible Foreign Accounts Receivable may be established and revised for the
     benefit of the Banks from time to time by the Agent in the exercise of its
     commercially reasonable discretion."

          "ELIGIBLE FOREIGN INVENTORY. With respect to the Borrower or any of
     the Guarantors, work in progress and raw materials inventory owned by the
     Borrower or such Guarantor in an aggregate amount (based on the net book
     value thereof determined on a first-in, first-out basis at the lower of
     cost or market) not to exceed forty percent (40%) of the net book value
     (determined on a first-in, first-out basis at the lower of cost or market)
     of all work in progress and raw materials inventory owned by the Borrower
     and the Guarantors, whether domestic or foreign; PROVIDED that Eligible
     Foreign Inventory shall not include any inventory (i) held on consignment,
     or not otherwise owned by the Borrower or such Guarantor, or of a type no
     longer sold by the Borrower or such Guarantor, (ii) which has been returned
     by a customer or is damaged or subject to any legal encumbrance other than
     Permitted Liens, (iii) which is not in the possession of the Borrower or
     such Guarantor unless the Agent has received a waiver, consent or other
     documentation deemed necessary or appropriate by the Agent from the party
     in possession of such inventory in form and substance satisfactory to the
     Agent, (iv) which is held by the Borrower or such Guarantor on property
     leased by the Borrower or such Guarantor, unless the Agent has received a
     waiver from the lessor of such leased property and, if any, sublessor
     thereof in form and substance satisfactory to the Agent, (v) as to which
     any or all actions deemed necessary or appropriate by the Agent in its sole
     discretion (after consultation, at the Borrower's expense, with such legal
     counsel, whether foreign or U.S. based, as the Agent may deem necessary or
     appropriate) in order properly to create and perfect the Agent's security
     interest therein, and to ensure the Agent's first priority interest therein
     and the Agent's ability to enforce such security interest, for the benefit
     of the Banks and the Agent, have not been taken, (vi) which has been
     shipped to a customer of the Borrower or such Guarantor regardless of
     whether such shipment is on a consignment basis, (vii) which is not located
     in the United States of America, or (viii) which the Agent reasonably deems
     to be obsolete or not marketable. General criteria for Eligible Foreign
     Inventory may be established and revised for the benefit of the Banks from
     time to time by the Agent in the exercise of its commercially reasonable
     discretion."

          "ELIGIBLE INVENTORY. With respect to the Borrower or any of the
     Guarantors, work in progress and raw materials inventory owned by the
     Borrower or such Guarantor; PROVIDED that Eligible Inventory shall not
     include any inventory (i) held on consignment (unless the Borrower or such
     Guarantor shall have taken all steps deemed necessary or appropriate by the
     Agent in its sole discretion to ensure the Agent's first priority perfected
     security interest in such inventory, including, without 

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                                      -10-



     limitation, the filing in the jurisdictions in which such inventory is to
     be located of UCC-1 financing statements by the Agent as secured party and
     the Borrower or such Guarantor as debtor and of consignment financing
     statements pursuant to ss.ss.9-114 and 2-326 of the Uniform Commercial Code
     as in effect in the Commonwealth of Massachusetts or any other applicable
     jurisdiction showing the Borrower or such Guarantor as consignor and the
     consignee of such consignment inventory as consignee, the prior written
     notification of any secured creditors of such consignees (with such notice
     to be in form and substance satisfactory to the Agent and in compliance
     with ss.ss.9-114 and 2-326 of the Uniform Commercial Code as in effect in
     the Commonwealth of Massachusetts or any other applicable jurisdiction),
     and such other actions or documents as the Agent may request), or not
     otherwise owned by the Borrower or such Guarantor, or of a type no longer
     sold by the Borrower or such Guarantor, (ii) which has been returned by a
     customer or is damaged or subject to any legal encumbrance other than
     Permitted Liens, (iii) which is not in the possession of the Borrower or
     such Guarantor unless the Agent has received a waiver, consent or other
     documentation deemed necessary or appropriate by the Agent from the party
     in possession of such inventory in form and substance satisfactory to the
     Agent, (iv) which is held by the Borrower or such Guarantor on property
     leased by the Borrower or such Guarantor, unless the Agent has received a
     waiver from the lessor of such leased property and, if any, sublessor
     thereof in form and substance satisfactory to the Agent, understanding,
     however, that the Agent may, in its sole discretion, excuse such a waiver
     for inventory held at the leased facility located at 4 Hampshire Drive,
     Hudson, New Hampshire, (v) as to which appropriate Uniform Commercial Code
     financing statements showing the Borrower or such Guarantor as debtor and
     the Agent, for the benefit of the Banks and the Agent, as secured party
     have not been filed in the proper filing office or offices in order to
     perfect the Agent's security interest therein, (vi) which has been shipped
     to a customer of the Borrower or such Guarantor regardless of whether such
     shipment is on a consignment basis, (vii) which is not located within the
     United States of America, or (viii) which the Agent reasonably deems to be
     obsolete or not marketable. General criteria for Eligible Inventory may be
     established and revised for the benefit of the Banks from time to time by
     the Agent in the exercise of its commercially reasonable (except as
     otherwise set forth in clause (i) above) discretion."

          "FIXED CHARGE COVERAGE RATIO. For any four consecutive fiscal quarters
     of the Borrower, the ratio of (a)(i) EBITDA for such period, MINUS (ii)
     Capital Expenditures made by the Borrower or any of its Subsidiaries during
     such period, but excluding, for each period of four consecutive fiscal
     quarters ending on or before the end of the Borrower's third fiscal
     quarter, 1999, $30,000,000 of Capital Expenditures made or to be made with
     respect to Continental Circuits' inner layer facility located in Phoenix,
     Arizona and its quick turn facility located in Austin, 

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                                      -11-


     Texas, MINUS (iii) cash taxes paid by the Borrower or any of its
     Subsidiaries during such period to (b)(i) principal payments on
     Indebtedness made by the Borrower or any of its Subsidiaries during such
     period PLUS (ii) Consolidated Total Interest Expense of the Borrower and
     its Subsidiaries."

          (j) deleting the definition of "Guarantor" in its entirety and
     substituting in lieu thereof the following new definition:

          "GUARANTORS. (i) Hadco Santa Clara; Hadco Phoenix, CCIR of Texas,
     until the consummation of the Restructuring Transaction, CCIR of
     California, and immediately following the Restructuring Transaction,
     Dynaflex; and (ii) any other direct or indirect Subsidiary of the Borrower
     (other than Hadco FSC, New Zycon, Hadco Scotland, Hadco Ireland, Hadco
     Malaysia, Hadco Singapore, New Continental or CCIR International)."

          (k) inserting the following new definitions in the order required by
     alphabetical order:

          "HADCO IRELAND. A wholly owned Subsidiary of the Borrower to be
     incorporated under the laws of Ireland."

          "HADCO PHOENIX STOCK PLEDGE AGREEMENT. The Stock Pledge Agreement
     dated or to be dated on or prior to the Third Amendment Effective Date
     between Hadco Phoenix and the Agent and in form and substance satisfactory
     to the Agent and the Banks."

          "HADCO SANTA CLARA STOCK PLEDGE AGREEMENT. The Stock Pledge Agreement
     dated or to be dated on or prior to the Third Amendment Effective Date
     between Hadco Santa Clara and the Agent and in form in substance
     satisfactory to the Agent and the Banks. "

          "HADCO SCOTLAND. Hadco Scotland Limited, a Scottish limited company
     and wholly owned Subsidiary of the Borrower."

          "HADCO SINGAPORE. A wholly owned Subsidiary of the Borrower or one of
     the Borrower's Subsidiaries to be incorporated under the laws of
     Singapore."

          "INTERIM CONCENTRATION ACCOUNTS. See ss.8.17.1."

          (l) deleting the definition of "Loan Documents" in its entirety and
     substituting in lieu thereof the following new definition:

          "LOAN DOCUMENTS. This Credit Agreement, the Notes, the Letter of
     Credit Applications, the Letters of Credit, the Security Documents, the
     Agent's Side Letter, the Third Amendment Side Letter, the Post-Closing

   12

                                      -12-


     Letter, any interest rate protection agreements entered into with any of
     the Banks in connection herewith and any other documents, instruments and
     agreements executed from time to time in connection therewith."

          (m) inserting the following new definitions in the order required by
     alphabetical order:

          "MORTGAGED PROPERTY. Any Real Estate which is subject to any
     Mortgage."

          "MORTGAGES. The several mortgages and/or deeds of trust, dated or to
     be dated on, prior to or after the Third Amendment Effective Date, from any
     of the Borrower and the Guarantors to the Agent with respect to the fee and
     leasehold interests of the Borrower and the Guarantors in the Real Estate
     and in form and substance satisfactory to the Banks and the Agent."

          "OPERATING ACCOUNT. The Borrower's Account No. 525-67832 with BKB."

          "RESERVES. As determined by the Agent, such amounts as the Agent may
     from time to time establish and revise in the exercise of its commercially
     reasonable discretion (a) to reflect events, conditions, contingencies or
     risks which do or may (i) adversely affect in any material respect either
     (A) any Collateral, the rights of the Agent or any of the Banks in any
     Collateral or its value or (B) the security interest and other rights of
     the Agent or any of the Banks in the Collateral (including the
     enforceability, perfection and priority thereof) or (ii) adversely affect
     in any material respect the assets (other than any Collateral) or business
     or financial condition of the Borrower or any of its Subsidiaries or (b) to
     reflect the belief of the Agent that any Borrowing Base Report or other
     collateral report or financial information furnished by or on behalf of the
     Borrower to the Agent or any of the Banks is or may have been incomplete,
     inaccurate or misleading in any material respect."

          "RESTRUCTURING TRANSACTION. The restructuring transaction pursuant to
     which (a) Dynaflex is to be incorporated, (b) those assets of CCIR of
     California pertaining to CCIR of California's "Dynaflex" operations are to
     be transferred to Dynaflex, (c) Dynaflex is to become a wholly owned
     Subsidiary of Hadco Santa Clara and (d) CCIR of California is to be merged
     into the Borrower."

          "SECURITY AGREEMENT. The Security Agreement, dated or to be dated on
     or prior to the Third Amendment Effective Date, among the Borrower, the
     Guarantors and the Agent and in form and substance satisfactory to the
     Banks and the Agent."

   13

                                      -13-


          "SECURITY DOCUMENTS. The Guaranties, the Security Agreement, the
     Mortgages, the Stock Pledge Agreements, the Agency Account Agreements, and
     all other instruments and documents, including without limitation, Uniform
     Commercial Code financing statements, required to be executed or delivered
     pursuant to any Security Documents."

          (n) deleting the definition of "Stock Pledge Agreement" in its
     entirety and substituting in lieu thereof the following new definition:

          "STOCK PLEDGE AGREEMENTS. The Borrower Stock Pledge Agreement, the
     Hadco Santa Clara Stock Pledge Agreement and the Hadco Phoenix Stock Pledge
     Agreement."

          (o) amending the definition of "Swing Line Settlement Date" by
     deleting from the end of clause (d) thereof the text "of the Total
     Commitment," and substituting in lieu thereof the text "of the lesser of
     the Total Commitment and the Borrowing Base,".

          (p) inserting the following new definitions in the order required by
     alphabetical order:

          "THIRD AMENDMENT. The Third Amendment and Modification Agreement dated
     as of September 14, 1998 among the Borrower, the Guarantors, the Agent and
     the Banks."

          "THIRD AMENDMENT EFFECTIVE DATE. The "Effective Date", as defined in
     the Third Amendment."

          "THIRD AMENDMENT SIDE LETTER AGREEMENT. The letter agreement dated as
     of the Third Amendment Effective Date between the Agent and the Borrower
     with respect to the payment of fees and other conditions agreed upon by the
     Agent and the Borrower."

     ss.2. AMENDMENT OF ss.2.1 OF THE CREDIT AGREEMENT. Section 2.1 of the
Credit Agreement is hereby amended by deleting the text "PROVIDED that the sum
of the outstanding amount of the Loans (after giving effect to all amounts
requested) PLUS the Maximum Drawing Amount and all Unpaid Reimbursement
Obligations shall not at any time exceed the Total Commitment;" and substituting
in lieu thereof the following text: "PROVIDED that the sum of the outstanding
amount of the Loans (after giving effect to all amounts requested) PLUS the
Maximum Drawing Amount and all Unpaid Reimbursement Obligations shall not at any
time exceed the lesser of (i) the Total Commitment and (ii) the Borrowing
Base;".

     ss.3. AMENDMENT OF ss.2.9.1(a) OF THE CREDIT AGREEMENT. Section 2.9.1(a) of
the Credit Agreement is hereby amended by deleting the text "exceed the Total
Commitment," at the end of clause (i) of the proviso thereof and 

   14

                                      -14-


substituting in lieu thereof the text "exceed the lesser of the Total Commitment
and the Borrowing Base".

     ss.4. ADDITION OF ss.ss.2.10 AND 2.11 OF THE CREDIT AGREEMENT. The Credit
Agreement is hereby amended by inserting, immediately after ss.2.9.3 of the
Credit Agreement and immediately before ss.3 of the Credit Agreement, the
following new ss.ss.2.10 and 2.11:

          "2.10. CHANGE IN BORROWING BASE. The Borrowing Base shall be
     determined monthly (or at such other interval as may be specified pursuant
     to ss.8.4(h)) by the Agent by reference to the Borrowing Base Report,
     commercial finance and collateral audit reports delivered to the Banks and
     the Agent pursuant to ss.8.9.3, and the appraisals of Eligible Fixed Assets
     delivered to the Banks and the Agent pursuant to ss.8.4(f) and other
     information obtained by or provided to the Agent. The Agent shall give to
     the Borrower and the Banks written notice (which notice may be given by
     facsimile) of any change in the Borrowing Base determined by the Agent. In
     the case of a reduction in the lending formula with respect to Eligible
     Accounts Receivable or Eligible Inventory, such notice shall be effective
     15 days after its receipt by the Borrower, and in the case of any change in
     the general criteria for Eligible Accounts Receivable or Eligible
     Inventory, such notice shall be effective 15 days after its receipt by the
     Borrower. In the case of a change in the Borrowing Base resulting from a
     change in the Determined Value of Eligible Fixed Assets based upon the
     results of any such appraisal or reappraisal, such notice shall be
     effective 30 days after its receipt by the Borrower. Prior to the time that
     such notice becomes effective, the Borrowing Base shall be computed as it
     would have been computed in the absence of such notice.

          2.11. REPAYMENTS OF LOANS AFTER EVENT OF DEFAULT. Following the
     occurrence and during the continuance of a Default or an Event of Default
     of which the account officers of the Agent active on the Borrower's account
     have knowledge, all funds transferred to the BKB Concentration Account or
     to the Operating Account and for which the Borrower has received credits
     may, in the Agent's sole discretion, be applied to the Obligations in
     accordance with ss.13.4. "

     ss.5. AMENDMENT OF ss.3.2 OF THE CREDIT AGREEMENT. Section 3.2 of the
Credit Agreement is hereby amended by deleting the first sentence thereof in its
entirety and substituting in lieu thereof the following text:

          "If at any time the sum of the outstanding amount of the Loans
     (including Swing Line Loans), the Maximum Drawing Amount and all Unpaid
     Reimbursement Obligations exceeds the lesser of (i) the Total Commitment
     and (ii) the Borrowing Base, then the Borrower shall immediately pay the
     amount of such excess to the Agent for the 

   15

                                      -15-


     respective accounts of the Banks and, if applicable, the Swing Line
     Lender."

     ss.6. AMENDMENT OF ss.4.1.1 OF THE CREDIT AGREEMENT. Section 4.1.1 of the
Credit Agreement is hereby amended by deleting the proviso at the end of the
first sentence thereof and substituting in lieu thereof the following text:

     "PROVIDED, HOWEVER, that, after giving effect to such request (a) the sum
     of the aggregate Maximum Drawing Amount and all Unpaid Reimbursement
     Obligations shall not exceed $15,000,000 at any time and (b) the sum of (i)
     the Maximum Drawing Amount on all Letters of Credit, (ii) all Unpaid
     Reimbursement Obligations, and (iii) the amount of all Loans outstanding
     (after giving effect to all amounts requested) shall not exceed the lesser
     of (x) the Total Commitment and (y) the Borrowing Base."

     ss.7. AMENDMENT OF ss.5.1 OF THE CREDIT AGREEMENT. Section 5.1 of the
Credit Agreement is hereby amended by:


          (a) inserting, immediately after the text "(the "Agent's Side
     Letter")" and immediately before the text "in accordance with the terms and
     conditions thereof.", the following text: "and in the Third Amendment Side
     Letter Agreement."

          (b) inserting, at the end thereof, the following text:

          "The Borrower further agrees to pay to the Agent for the PRO RATA
     account of each Bank in accordance with such Bank's Commitment Percentage a
     usage fee calculated (a) at the rate per annum equal to the Applicable
     Eurodollar Rate Usage Fee Margin on the sum of the average daily amount,
     during each calendar quarter or portion thereof, commencing with the Third
     Amendment Effective Date, of the Maximum Drawing Amount PLUS all Unpaid
     Reimbursement Obligations PLUS the outstanding amount of all Eurodollar
     Rate Loans PLUS the outstanding amount of all Swing Line Loans which are
     Fixed Rate Loans and (b) at a rate per annum equal to the Applicable Base
     Rate Usage Fee Margin on the sum of the average daily amount, during each
     calendar quarter or portion thereof, commencing with the Third Amendment
     Effective Date, of the outstanding amount of all Base Rate Loans PLUS the
     outstanding amount of all Swing Line Loans which are not Fixed Rate Loans.
     Such usage fee shall be payable quarterly in arrears on the first day of
     each calendar quarter for the immediately preceding calendar quarter or
     portion thereof commencing on the first such date following the Third
     Amendment Effective Date."

     ss.8. AMENDMENT OF ss.6 OF THE CREDIT AGREEMENT. Section 6 of the Credit
Agreement is hereby deleted in its entirety and the following new ss.6 is hereby
inserted in lieu thereof:

   16

                                      -16-


          "ss.6. COLLATERAL SECURITY AND GUARANTIES.

     ss.6.1. SECURITY OF BORROWER. The Obligations shall be secured by a
perfected first priority security interest (subject only to Permitted Liens
entitled to priority under applicable law) in substantially all of the assets of
the Borrower, whether now owned or hereafter acquired, pursuant to the terms of
the Security Documents to which the Borrower is a party.

     ss.6.2. GUARANTIES AND SECURITY OF GUARANTORS. The Obligations shall also
be guaranteed by each Guarantor pursuant to the terms of its Guaranty. The
Obligations of the Guarantors under the Guaranties shall in turn be secured by a
perfected first priority security interest (subject only to Permitted Liens
entitled to priority under applicable law) in substantially all of the assets of
each such Guarantor, whether now owned or hereafter acquired, pursuant to the
terms of the Security Documents to which such Guarantor is a party."

     ss.9. AMENDMENT OF ss.7.3 OF THE CREDIT AGREEMENT. Section 7.3 of the
Credit Agreement is hereby deleted in its entirety, and the following new ss.7.3
is hereby substituted in lieu thereof:

          "7.3. TITLE TO PROPERTIES; LEASES. Except as indicated on SCHEDULE 7.3
     hereto, the Borrower and its Subsidiaries own all of the assets reflected
     in the consolidated balance sheet of the Borrower and its Subsidiaries, as
     at the Balance Sheet Date, or acquired since that date (except property and
     assets sold or otherwise disposed of in the ordinary course of business
     since that date), subject to no rights of others, including any mortgages,
     leases, conditional sales agreements, title retention agreements, liens or
     other encumbrances except Permitted Liens. Without limiting the foregoing,
     the Borrower and the Guarantors own all of the trademarks, copyrights,
     patents and other intellectual property rights reflected in such
     consolidated balance sheet, subject to no rights of others, including any
     mortgages, leases, conditional sales agreements, title retention
     agreements, liens or other encumbrances other than licenses thereof to
     third parties for fair market value."

     ss.10. AMENDMENT OF ss.7.5 OF THE CREDIT AGREEMENT. Section 7.5 of the
Credit Agreement is hereby amended by deleting the first sentence thereof in its
entirety and substituting in lieu thereof the following text:

          "7.5. NO MATERIAL CHANGES, ETC. Except as set forth on SCHEDULE 7.5
     hereto and in the press release of the Borrower dated August 19, 1998 and
     distributed to the Agent and the Banks on the Third Amendment Effective
     Date, since the Balance Sheet Date, there has occurred no materially
     adverse change in the financial condition or business of the Borrower and
     its Subsidiaries, as shown on or reflected in the consolidated balance
     sheet of the Borrower and its Subsidiaries as at the Balance Sheet Date,
     for the year then ended, or the consolidated 

   17

                                      -17-


     statements of income for the fiscal year of the Borrower then ended, other
     than changes in the ordinary course of business that have not had any
     materially adverse effect, either individually or in the aggregate, on the
     business or financial condition of the Borrower and its Subsidiaries,
     considered as a whole."

     ss.11. AMENDMENT OF ss.7.6 OF THE CREDIT AGREEMENT. Section 7.6 of the
Credit Agreement is hereby amended by inserting the following new sentence at
the end thereof:

     "Attached hereto as SCHEDULE 7.6 is a true, correct and complete list of
     all patents, patent applications, federally registered copyrights,
     trademarks, trademark applications, trade names and other intellectual
     property owned by any of the Transaction Parties as of the Third Amendment
     Effective Date."

     ss.12. AMENDMENT OF ss.7.17 OF THE CREDIT AGREEMENT. Section 7.17 of the
Credit Agreement is hereby amended by inserting, immediately before the period
(".") at the end thereof, the text "or as a condition to the recording of any
Mortgage".

     ss.13. AMENDMENT OF ss.7.18 OF THE CREDIT AGREEMENT. Section 7.18 of the
Credit Agreement is hereby deleted in its entirety and the following new ss.7.18
is hereby substituted in lieu thereof:

          "7.18. SUBSIDIARIES, ETC. Hadco Santa Clara, New Zycon, Hadco FSC,
     Hadco Scotland, Hadco Phoenix, New Continental and, following the
     incorporation thereof, Hadco Ireland are or, as the case may be, will be
     the only direct Subsidiaries of the Borrower, and the Borrower owns or, in
     the case of Hadco Ireland, will, following the incorporation thereof, own
     one hundred percent (100%) of the capital stock of each such entity. (As of
     the Effective Date, it is not known whether Hadco Singapore, following the
     incorporation thereof, will be a direct or indirect subsidiary of the
     Borrower). Hadco Malaysia and (following the consummation of the
     Restructuring Transaction) Dynaflex are the only Subsidiaries of Hadco
     Santa Clara, and Hadco Santa Clara owns or (with respect to Dynaflex,
     following the consummation of the Restructuring Transaction) will own one
     hundred percent (100%) of the capital stock of each such entity. CCIR of
     Texas, CCIR International and (until the consummation of the Restructuring
     Transaction) CCIR of California are the only Subsidiaries of Hadco Phoenix,
     and Hadco Phoenix owns one hundred percent (100%) of the capital stock of
     CCIR of Texas and CCIR International and will own, until the consummation
     of the Restructuring Transaction, one hundred percent (100%) of the capital
     stock of CCIR of California. None of New Zycon, New Continental, Hadco FSC,
     Hadco Scotland, CCIR of California, CCIR of Texas, Hadco Malaysia or CCIR
     International has any Subsidiaries, and following the incorporation
     thereof, none of Dynaflex, Hadco Ireland or Hadco Singapore will have 

   18

                                      -18-

     any Subsidiaries. Except as set forth on SCHEDULE 7.18 hereto, none of the
     Transaction Parties is engaged in any joint venture or partnership with any
     other Person."

     ss.14. ADDITION OF ss.ss.7.21 AND 7.22 TO THE CREDIT AGREEMENT. The Credit
Agreement is hereby amended by inserting, immediately after ss.7.20 of the
Credit Agreement and immediately before ss.8 of the Credit Agreement, the
following new ss.ss.7.21 and 7.22:

          "7.21. PERFECTION OF SECURITY INTERESTS, ETC. Except for those items
     set forth on SCHEDULE 7.21 hereto (and only for the time periods permitted
     by SCHEDULE 7.21), all filings, assignments, pledges and deposits of
     documents or instruments have been made and all other actions have been
     taken that are necessary or advisable, under applicable law, to establish
     and perfect the Agent's security interest in the Collateral. The Collateral
     and the Agent's rights with respect to the Collateral are not subject to
     any setoff, claims, withholdings or other defenses except for the rights of
     holders of Permitted Liens. The Borrower or one of the Guarantors is the
     owner of the Collateral free from any lien, security interest, encumbrance
     and any other claim or demand, except for Permitted Liens."

          "7.22. BANK ACCOUNTS. SCHEDULE 7.22 sets forth the account numbers and
     location of all Interim Concentration Accounts and other bank accounts of
     the Borrower or any of the other Transaction Parties."

     ss.15. AMENDMENT OF ss.8.4 TO THE CREDIT AGREEMENT. Section 8.4 of the
Credit Agreement is hereby amended by:

          (a) inserting, at the end of subsection (e) thereof, immediately
     before the semicolon (";"), the text "and contemporaneously with the
     delivery of the financial statements referred to in subsections (a) and (b)
     of this ss.8.4, projections, satisfactory in form and substance to the
     Agent, for the four consecutive fiscal quarters of the Borrower immediately
     following the quarter(s) for which such financial statements are to be
     delivered";

          (b) deleting the word "and" at the end of subsection (e) thereof;

          (c) inserting new subsection (f), (g) and (h) immediately after
     subsection (e) and immediately before existing subsection (f) thereof, with
     the following text:

          "(f) as soon as practicable, but in any event not later than
          forty-five (45) days after request by the Agent made after determining
          in its discretion that an appraisal or reappraisal of the value of
          Eligible Fixed Assets of the Borrower or any Guarantor is necessary to
          insure the accuracy of the Borrowing Base, an 

   19

                                      -19-


          appraisal or reappraisal, as the case may be, of the value of such
          Eligible Fixed Assets, which appraisal or reappraisal shall be
          conducted at the expense of the Borrower or such Guarantor by an
          appraiser selected by the Agent in form and substance satisfactory to
          the Agent;

          (g) within fifteen (15) days after the end of each fiscal month, an
          Accounts Receivable aging report satisfactory in form and substance to
          the Agent;

          (h) within fifteen (15) days after the end of each fiscal month or at
          such earlier time as the Agent may reasonably request, a Borrowing
          Base Report setting forth the Borrowing Base as at the end of such
          calendar month or other date so requested by the Agent; and".

          (d) deleting the letter reference "(f)" at the beginning of existing
     subsection (f) and substituting in lieu thereof the letter "(i)".

     ss.16. ADDITION OF ss.ss.8.5.4 AND 8.5.5 TO THE CREDIT AGREEMENT. The
Credit Agreement is hereby amended by inserting, immediately after ss.8.5.3 and
immediately before ss.8.6 of the Credit Agreement, new ss.ss.8.5.4 and 8.5.5
with the following text:

          "8.5.4. NOTIFICATION OF CLAIMS AGAINST COLLATERAL. The Borrower will,
     immediately upon becoming aware thereof, notify the Agent in writing of any
     setoff, claims (including, with respect to the Real Estate, environmental
     claims), withholdings or other defenses to which any of the Collateral, or
     the Agent's rights with respect to the Collateral, are subject."

   
          "8.5.5. NOTIFICATION OF ADDITIONAL INTELLECTUAL PROPERTY RIGHTS.
     Promptly upon acquisition, creation or, as the case may be, application for
     registration or registration of any thereof or upon approval by the
     intellectual property committee of the Borrower to file an application or
     registration thereof, the Borrower will notify the Agent in writing of any
     patents, patent applications, patent application disclosures filed with any
     patent office or which the intellectual property committee of the Borrower
     has approved for filing as a patent application, registered copyrights or
     mask works, applications for registration of copyrights or mask works,
     trademark and service mark registrations, trademark and service mark
     registration applications, trademarks, service marks and trade names for
     which the intellectual property committee of the Borrower has approved
     filing trademark registration applications, and unregistered mask works
     all of the foregoing whether a foreign or United States right and 
     whether owned by 
    
   20

                                      -20-


     the Borrower or any of the other Transaction Parties, to the extent not
     listed on SCHEDULE 7.6. The Borrowers will promptly notify the Agent in
     writing of its abandonment of any of the foregoing."

     ss.17. AMENDMENT OF ss.8.7 OF THE CREDIT AGREEMENT. Section 8.7 of the
Credit Agreement is hereby amended by deleting the period (".") at the end
thereof and substituting in lieu thereof the following text: "and of the
Security Agreement. The Borrower will, and will cause each of the Guarantors to,
maintain insurance on the Mortgaged Properties in accordance with the terms of
the Mortgages."

     ss.18. ADDITION OF ss.ss.8.9.3, 8.9.4 AND 8.9.5 TO THE CREDIT AGREEMENT.
The Credit Agreement is hereby amended by inserting, immediately after ss.8.9.2
of the Credit Agreement and immediately before ss.8.10 of the Credit Agreement,
the following new ss.ss.8.9.3, 8.9.4 and 8.9.5:

          "ss.8.9.3. COLLATERAL REPORTS. No more frequently than four times
     during each calendar year, or more frequently as determined by the Agent if
     an Event of Default shall have occurred and be continuing, upon the request
     of the Agent, the Borrower will obtain and deliver to the Agent, or, if the
     Agent so elects, will cooperate with the Agent in the Agent's obtaining, a
     report of an independent collateral auditor satisfactory to the Agent
     (which may be affiliated with one of the Banks) with respect to the
     Accounts Receivable and inventory components included in the Borrowing
     Base, which report shall indicate whether or not the information set forth
     in the Borrowing Base Report most recently delivered is accurate and
     complete in all material respects based upon a review by such auditors of
     the Accounts Receivable (including verification with respect to the amount,
     aging, identity and credit of the respective account debtors and the
     billing practices of the Borrower or the applicable Guarantor) and
     inventory (including verification as to the value, location and respective
     types). All such collateral value reports shall be conducted and made at
     the expense of the Borrower.

          ss.8.9.4. APPRAISALS. No more frequently than once each calendar year,
     or more frequently if required by the Agent to evaluate the value of
     Eligible Fixed Assets if an Event of Default shall have occurred and be
     continuing or if required by any statute, rule, regulation, or governmental
     authority or internal policy of the Agent, the Borrower will, upon the
     request of the Agent, obtain and deliver to the Agent appraisal reports in
     form and substance and from appraisers satisfactory to the Agent, stating
     (i) the then current fair market, orderly liquidation and forced
     liquidation values of all or any portion of the equipment or real estate
     owned by the Borrower or any of the other Transaction Parties and (ii) the
     then current business value of each of the Borrower and the other
     Transaction Parties. All such appraisals shall be conducted and made at the
     expense of the Borrower.

   21

                                      -21-


          ss.8.9.5. ENVIRONMENTAL ASSESSMENTS. Upon the occurrence and during
     the continuance of any Event of Default, the Agent may in its discretion
     and shall, if required by any statute, rule, regulation, governmental
     authority or internal policy of the Agent, from time to time, for the
     purpose of assessing and ensuring the value of any Mortgaged Property,
     obtain one or more environmental assessments or audits of such Mortgaged
     Property prepared by a hydrogeologist, an independent engineer or other
     qualified consultant or expert approved by the Agent to evaluate or confirm
     (i) whether any Hazardous Substances are present in the soil or water at
     such Mortgaged Property and (ii) whether the use and operation of such
     Mortgaged Property complies with all Environmental Laws. Environmental
     assessments may include without limitation detailed visual inspections of
     such Mortgaged Property including any and all storage areas, storage tanks,
     drains, dry wells and leaching areas, and the taking of soil samples,
     surface water samples and ground water samples, as well as such other
     investigations or analyses as the Agent deems appropriate. All such
     environmental assessments shall be conducted and made at the expense of the
     Borrower."

     ss.19. ADDITION OF ss.ss.8.16, 8.17, 8.18 AND 8.19 TO THE CREDIT AGREEMENT.
The Credit Agreement is hereby amended by inserting, immediately after ss.8.15
of the Credit Agreement and immediately before ss.9 of the Credit Agreement, the
following new ss.ss.8.16, 8.17, 8.18 and 8.19:

          "ss.8.16. FISCAL YEAR. The Borrower will maintain October 25, 1997 as
     the end of its 1997 fiscal year and the end of its fourth fiscal quarter,
     1997, and will cause each of its fiscal quarters ending thereafter to end
     precisely thirteen (13) calendar weeks following the date on which the
     preceding fiscal quarter of the Borrower ended."

          "ss.8.17. BANK ACCOUNTS.

               ss.8.17.1. GENERAL. The Borrower agrees, upon the request of the
          Agent, to establish a depository account (the "BKB Concentration
          Account") under the control of the Agent for the benefit of the Banks
          and the Agent, in the name of the Borrower and the other Transaction
          Parties. The Borrower agrees to cause all account debtors and other
          obligors of the Borrower or any of the other Transaction Parties, to
          remit all cash proceeds of Accounts Receivable to (i) concentration
          depository or other accounts ("Interim Concentration Accounts") with
          financial institutions which have entered into agency account
          agreements and, if applicable, lock box agreements with the Agent
          (collectively, the "Agency Account Agreements") with respect to such
          accounts, with each such agreement to be in form and substance
          satisfactory to the Agent, or (ii) the BKB Concentration Account or
          the Operating Account. On or prior to the Third Amendment Effective
          Date or by such other date for the obtaining of Agency Account
          Agreements as 

   22

                                      -22-


          may be specified in SCHEDULE 8.19, the Borrower (a) will deliver to
          the Agent fully executed Agency Account Agreements with respect to the
          Interim Concentration Accounts pursuant to which the Borrower or one
          of the Transaction Parties shall direct all depository institutions
          with Interim Concentration Accounts, upon notice from the Agent (which
          notice the Agent hereby agrees shall only be given following the
          occurrence and during the continuance of a Default or Event of
          Default), to cause all funds of the Borrower and the other Transaction
          Parties held in such Interim Concentration Accounts to be transferred
          daily to, and only to, the BKB Concentration Account, (b) will at all
          times ensure that immediately upon the Borrower's or any of the other
          Transaction Parties' receipt of any funds constituting cash proceeds
          of any Collateral, all such amounts shall have been deposited in an
          Interim Concentration Account, the Operating Account or the BKB
          Concentration Account, and (c) acknowledges and agrees that following
          the occurrence and during the continuance of an Event of Default,
          neither the Borrower nor any of the other Transaction Parties shall
          have any right to withdraw or otherwise have access to funds in the
          BKB Concentration Account or the Operating Account unless otherwise
          permitted pursuant to ss.2.11.

               ss.8.17.2. ACKNOWLEDGMENT OF APPLICATION. The Borrower hereby
          agrees that following the occurrence and during the continuance of a
          Default or an Event of Default all amounts received by the Agent in
          the BKB Concentration Account and the Operating Account will be the
          sole and exclusive property of the Agent, for the accounts of the
          Banks and the Agent, to be applied, in accordance with ss.2.11."

          "8.18. ADDITIONAL MORTGAGED PROPERTY. At any time following the Third
     Amendment Effective Date, upon written request of the Agent, the Borrower
     shall, and shall cause any of the other Transaction Parties to, forthwith
     (but in any event within 45 days following any such request therefor)
     deliver to the Agent for the benefit of the Banks a fully executed mortgage
     or deed of trust over any Real Estate owned or leased but not mortgaged to
     the Agent on the Third Amendment Effective Date or as required pursuant to
     SCHEDULE 8.19, each in form and substance satisfactory to the Agent,
     together with such title insurance policies, surveys, evidences of
     insurance with the Agent named as loss payee and additional insured, legal
     opinions and other documents and certificates with respect to such Real
     Estate as the Agent may reasonably request. If, after the Third Amendment
     Effective Date, the Borrower or any of the other Transaction Parties
     acquires or leases additional Real Estate, the Borrower shall, or shall
     cause such other Transaction Party to, promptly notify the Agent in writing
     thereof and in each case to the extent requested by the Agent, forthwith
     (but in any event within 45 days following any such request therefor)
     deliver to the Agent for the benefit of 

   23

                                      -23-


     the Banks a fully executed mortgage or deed of trust over such Real Estate,
     in form and substance satisfactory to the Agent, together with such title
     insurance policies, surveys, evidences of insurance with the Agent named as
     loss payee and additional insured, legal opinions and other documents and
     certificates with respect to such real estate as the Agent may reasonably
     request. The Borrower further agrees that, following the taking of such
     actions with respect to such Real Estate, the Agent shall have, for the
     benefit of the Banks, a valid and enforceable first priority mortgage or
     deed of trust over such Real Estate, free and clear of all defects and
     encumbrances except for Permitted Liens."

          "ss.8.19. THIRD AMENDMENT POST-CLOSING REQUIREMENTS. The Transaction
     Parties shall complete, or shall cause the completion of, all of the
     conditions, actions and items set forth on SCHEDULE 8.19 on or before the
     respective due dates therefor set forth on SCHEDULE 8.19. Such conditions,
     actions and items shall not be deemed waived by virtue of the fact that
     they are not completed on the Third Amendment Effective Date."

     ss.20. AMENDMENT OF ss.9.1 OF THE CREDIT AGREEMENT. Section 9.1 of the
Credit Agreement is hereby amended by:

          (a) deleting the dollar amount "$50,000,000" from each of subsections
     (f) and (g) thereof and substituting in lieu thereof the dollar amount
     "$30,000,000";

          (b) deleting the dollar amount "$55,000,000" in clause (iii) of
     subsection (i) thereof and substituting in lieu thereof the dollar amount
     "$65,000,000";

          (c) deleting the word "and" immediately before clause (iv) of
     subsection (i) thereof;

          (d) inserting, immediately before the semicolon (";") at the end of
     clause (iv) of subsection (i) thereof, the following text:

          "(v) CCIR International to the Borrower in an aggregate amount not to
     exceed $2,000,000; and (vi) Hadco Scotland, Hadco Singapore and/or Hadco
     Ireland to the Borrower in an aggregate amount for all such entities not to
     exceed $5,000,000".

     ss.21. AMENDMENT OF ss.9.2 OF THE CREDIT AGREEMENT. Section 9.2 of the
Credit Agreement is hereby amended by:

          (a) deleting, from the introductory paragraph thereof, immediately
     before clause (v) thereof the text "or");

   24

                                      -24-


          (b)  inserting, in the introductory paragraph thereof, immediately
     after clause (v) thereof and immediately before the proviso set forth
     therein, the following new clause (vi):

               "(vi) enter into or permit to exist any arrangement or agreement,
     enforceable under applicable law, which directly or indirectly prohibits
     the Borrower or any of the other Transaction Parties from creating or
     incurring any lien, encumbrance, mortgage, pledge, charge, restriction or
     other security interest other than in favor of the Agent for the benefit of
     the Banks and the Agent under the Loan Documents and other than customary
     anti-assignment provisions in leases and licensing agreements entered into
     by the Borrower or such other Transaction Party in the ordinary course of
     its business, provisions restricting Hadco Malaysia to the extent contained
     in the credit facility with Bank Bumiputra Malaysia Berhad permitted by
     ss.9.1 and the Indenture;

          (c)  inserting the text "other than Mortgaged Properties" in 
     subsection (d) thereof immediately after the text "liens on properties";

          (d)  inserting the text "other than Mortgaged Properties" in 
     subsection (e) thereof immediately after the text "and other like liens on
     properties";

          (e)  inserting the text "other than Mortgaged Properties" in 
     subsection (f) thereof immediately after the text "encumbrances on Real 
     Estate";

          (f)  inserting the following text immediately before the semicolon
     (";") at the end of subsection (f) thereof: "and encumbrances on Mortgaged
     Properties to the extent agreed upon by the Agent and set forth as
     exceptions in the title policies delivered by the Borrower or any Guarantor
     to the Agent with respect to such Mortgaged Properties and in compliance
     with the terms and conditions of this Credit Agreement";

          (g)  inserting the text "other than Mortgaged Properties" in 
     subsection (h) thereof immediately after the text "mortgages on real or 
     personal property".

     ss.22. AMENDMENT OF ss.9.3(f) OF THE CREDIT AGREEMENT. Section 9.3(f) of
the Credit Agreement is hereby deleted in its entirety, and the following new
subsection (f) is hereby substituted in lieu thereof:

          "(f) Investments consisting of (i) (A) the Guaranties or (B)
Guaranties issued by the Guarantors of the Borrower's obligations under the
Subordinated Notes, and (ii) Investments by the Borrower in (A) any of the
Guarantors, (B) Hadco FSC in an aggregate amount not to exceed $2,000,000, (C)
New Zycon or New Continental in an aggregate amount not to exceed $50,000, (D)
CCIR International in an aggregate amount not to exceed 

   25

                                      -25-


$2,000,000, and (E) Hadco Ireland, Hadco Singapore and Hadco Scotland in an
aggregate amount for all such entities not to exceed $5,000,000;"

     ss.23. AMENDMENT OF ss.9.5 OF THE CREDIT AGREEMENT. Section 9.5 of the
Credit Agreement is hereby amended by:

          (a) deleting from ss.9.5.2(a) thereof the text "the Borrower may make
     one or more asset or stock acquisitions in an amount not to exceed
     $25,000,000 in any individual case or $50,000,000 in the aggregate" and
     substituting in lieu thereof the following text: "the Borrower may make one
     or more asset or stock acquisitions in an amount not to exceed $30,000,000
     in the aggregate".

          (b) deleting from the beginning of ss.9.5.2(b) thereof the text
     "subject to the requirements of this ss.9.5.2(b), the Borrower may effect
     asset or stock acquisitions in addition to those otherwise permitted by
     this ss.9.5.2 to the extent that" and substituting in lieu thereof the
     following text: "subject to the requirements of this ss.9.5.2(b), the
     Borrower may, if and to the extent approved in advance by the Majority
     Banks in writing, effect asset or stock acquisitions in addition to those
     otherwise permitted by this ss.9.5.2 to the extent that".

          (c) deleting from ss.9.5.2(b) thereof the text "and PROVIDED FURTHER
     that, contemporaneously with the closing of such Permitted Acquisition, any
     newly acquired Subsidiary shall, pursuant to documentation in form and
     substance satisfactory to the Agent and the Agent's Special Counsel, become
     a party to and Guarantor under, and be bound by all of the terms and
     conditions of, a Guaranty in the form of EXHIBIT E hereto and shall provide
     to the Agent, in addition to such Guaranty, such evidence of corporate
     authorization, legal opinions and other documentation as the Agent may
     request." and substituting in lieu thereof the following text:

          "and PROVIDED FURTHER that, contemporaneously with the closing of such
          Permitted Acquisition, the Borrower shall (i) take such action as may
          be necessary or advisable in the opinion of the Agent to pledge or
          cause to be pledged to the Agent, for the benefit of the Banks and the
          Agent, on a perfected, first-priority basis all of the capital stock
          or other equity interests of such Subsidiary pursuant to a pledge
          agreement in form and substance satisfactory to the Agent, which such
          pledge agreement shall be a Stock Pledge Agreement and a Security
          Document hereunder, (ii) cause such Subsidiary to guaranty all of the
          Obligations hereunder pursuant to a Guaranty in the form of EXHIBIT E,
          which Guaranty shall be a Guaranty and Security Document hereunder,
          (iii) cause such Subsidiary to take all steps as may be necessary or
          advisable in the opinion of the Agent to grant to the Agent, for the
          benefit of the Banks and the Agent, a first priority, perfected
          security 

   26

                                      -26-


          interest in substantially all of its assets as collateral security for
          such guaranty, pursuant to security documents, mortgages, pledges and
          other documents in form and substance satisfactory to the Agent, each
          of which documents shall be Security Documents hereunder; and (iv)
          deliver to the Agent all such evidence of corporate authorization,
          legal opinions (including local counsel opinions where applicable),
          and other documentation as the Agent may request."


     ss.24. AMENDMENT OF ss.9.10 OF THE CREDIT AGREEMENT. Section 9.10 of the
Credit Agreement is hereby amended by deleting the section heading and inserting
"9.10 AGREEMENTS WITH RESPECT TO CERTAIN SUBSIDIARIES OF THE BORROWER," and by
inserting the following sentence at the end of ss.9.10:

          "Neither the Borrower nor any of the other Transaction Parties shall
          (a) without limiting the Indebtedness and Investment limitations set
          forth in ss.ss.9.1(i), 9.3(f) and 9.3(g), transfer assets to Hadco
          Scotland, Hadco Ireland, Hadco Singapore (following the incorporation
          thereof) or Hadco Malaysia in an aggregate amount exceeding, for all
          such entities, $2,000,000 or (b) permit Hadco Scotland, Hadco Ireland,
          Hadco Singapore (following the incorporation thereof) or Hadco
          Malaysia at any one time to own, hold or have an interest in, property
          or assets, whether tangible or intangible and including cash and cash
          equivalents, in excess of those reasonably required for the conduct of
          each such entity's business operations in the ordinary course."

     ss.25. ADDITION OF ss.ss.9.12 AND 9.13 TO THE CREDIT AGREEMENT. The Credit
Agreement is hereby amended by inserting, immediately after ss.9.11 of the
Credit Agreement and immediately before ss.10 of the Credit Agreement, the
following new ss.ss.9.12 and 9.13:

               "9.12. BANK ACCOUNTS. The Borrower will not, and will not permit
          any of the other Transaction Parties to, (i) establish any bank
          accounts other than those Interim Concentration Accounts and other
          accounts, all listed on SCHEDULE 7.22, without the Agent's prior
          written consent, (ii) violate directly or indirectly any Agency
          Account Agreement or other bank agency or lock box agreement in favor
          of the Agent for the benefit of the Banks and the Agent with respect
          to such account, (iii) deposit into any of the payroll accounts listed
          on SCHEDULE 7.22 any amounts in excess of amounts necessary to pay
          current payroll obligations from such accounts, (iv) at any time
          deposit or maintain in the accounts designated on SCHEDULE 7.22 as
          "Imprest" accounts an aggregate amount for all such accounts in excess
          of $100,000, (v) at any time maintain in any accounts opened by or on
          behalf of Hadco Malaysia, Hadco Singapore, Hadco Ireland, Hadco FSC or
          Hadco 

   27

                                      -27-


          Scotland and listed on SCHEDULE 7.22 an aggregate amount for all such
          accounts in excess of $700,000, (vi) at any time deposit or maintain
          in Account No. 00015321 with State Street Bank & Trust Company,
          designated on SCHEDULE 7.22 as "TC East Freight" an aggregate amount
          in excess of $20,000, (vii) deposit or maintain in any of the accounts
          listed on SCHEDULE 7.22 and designated as "Dependent Care", "Santa
          Clara Voluntary Disability Plan-Contributions" or "Santa Clara
          Voluntary Disability Plan-Distributions" any amounts in excess of
          amounts necessary for the Borrower or such Transaction Party to meet
          its state or federally mandated obligations with respect to dependent
          care tax credits or, as the case may be, disability plans, or (viii)
          at any time deposit or maintain in any of the accounts designated on
          SCHEDULE 7.22 as "Rabbi Trust-Money Market" and "Rabbi
          Trust-Disbursements" any amounts in excess of those to be distributed
          to employees of Hadco Santa Clara in connection with the Zycon
          Employee Distribution upon the vesting of their interests therein
          (with the aggregate of such amounts to be distributed being less than
          $2,000,000 as of the Third Amendment Effective Date). Upon request of
          the Agent, the Borrower shall, within ten (10) business days following
          any request therefor, document for the Agent the flow of funds to and
          from the accounts referenced in (iv) and (v) hereof."

               "9.13. CREATION OF SUBSIDIARIES. None of the Transaction Parties
          shall create any Subsidiary (not existing on the Third Amendment
          Effective Date and other than Subsidiaries disclosed in ss.7.18
          hereof) unless (a) one hundred percent (100%) of the capital stock or
          other equity interests of such Subsidiary are owned by a Guarantor or
          the Borrower, (b) prior to the formation of such Subsidiary, the
          Borrower shall notify the Agent and the Banks thereof in writing, and
          (c) contemporaneously with the formation of such Subsidiary, the
          Borrower shall, or shall cause such other Transaction Party to, (i)
          take all steps as may be necessary or advisable in the opinion of the
          Agent to pledge to the Agent, for the benefit of the Banks and the
          Agent, on a perfected, first-priority basis, all of the capital stock
          or other equity interests of such Subsidiary (except that 65% (or such
          larger percentage as may be permitted without creating material
          adverse tax consequences for the Borrower under the Code) of the
          capital stock of Hadco Singapore, Hadco Ireland, Hadco Scotland, Hadco
          FSC, CCIR International and Hadco Malaysia shall be pledged) pursuant
          to a pledge agreement in form and substance satisfactory to the Agent,
          which such pledge agreement shall be a Stock Pledge Agreement and a
          Security Document hereunder, (ii) cause any such Subsidiary which is
          or is to become a Guarantor to guaranty all of the Obligations
          hereunder pursuant to a guaranty in the 

   28

                                      -28-


          form of EXHIBIT E hereto, which such guaranty shall be a Guaranty and
          a Security Document hereunder, (iii) cause any such Subsidiary which
          is or is to become a Guarantor to take all steps as may be necessary
          or advisable in the opinion of the Agent to grant to the Agent, for
          the benefit of the Banks and the Agent, a first priority, perfected
          security interest in substantially all of its assets as collateral
          security for such guaranty, pursuant to security documents, mortgages,
          pledges and other documents in form and substance satisfactory to the
          Agent, each of which documents shall be Security Documents hereunder,
          and (iv) deliver to the Agent all such evidence of corporate or other
          authorization, legal opinions (including local counsel opinions where
          applicable) and other documentation as the Agent may request."

     ss.26. AMENDMENT OF ss.10.1 OF THE CREDIT AGREEMENT. Section 10.1 of the
Credit Agreement is hereby deleted in its entirety, and the following new
ss.10.1 is hereby substituted in lieu thereof:

          "10.1. FUNDED DEBT TO EBITDA. The Borrower will not, as at the end of
     any fiscal quarter of the Borrower set forth in the table below, permit the
     ratio of (a) Consolidated Funded Debt as at such quarter end to (b) EBITDA
     for the four consecutive fiscal quarters then ended to be greater than the
     ratio set forth opposite such fiscal quarter in the table below:



              Fiscal Quarters                       Ratio
              ---------------                       -----

     3rd FQtr '98, 4th FQtr '98, 1st FQtr '99,     
        2nd FQtr '99                               4.00:1.0
     3rd FQtr '99                                  3.50:1.0
     4th FQtr '99 and each fiscal quarter          3.25:1.0
        ending thereafter

          The calculation of such ratio shall include, on a PRO FORMA basis and
     if and to the extent approved by the Majority Banks (which approval shall
     require, INTER ALIA, the Agent's and the Banks' receipt of audited
     financial statements for any Target acquired in accordance with
     ss.9.5.2(b), together with an unqualified audited opinion letter from
     Arthur Andersen LLP or another nationally recognized accounting firm
     satisfactory to the Agent and the Majority Banks, or which financial
     statements or opinion letter shall otherwise be satisfactory to the Agent
     and the Majority Banks), EBITDA for such period of any Target acquired in
     compliance with ss.9.5.2(b), regardless of whether such acquisition is by
     way of stock purchase, asset purchase or pooling of interests."

   29

                                      -29-


     ss.27. AMENDMENT OF ss.10.2 TO THE CREDIT AGREEMENT. Section 10.2 of the
Credit Agreement is hereby deleted in its entirety, and the following new
ss.10.2 is hereby substituted in lieu thereof:

          "10.2. EBIT TO INTEREST EXPENSE. (a) For the four consecutive fiscal
     quarters of the Borrower ended August 1, 1998, the Borrower will not permit
     the ratio of (a) EBIT for such fiscal quarters to (b) Consolidated Total
     Interest Expense for such fiscal quarters to be less than 3.0:1.0, and (b)
     thereafter, the Borrower will not, as at the end of any fiscal quarter of
     the Borrower set forth in the table below, permit the ratio of EBIT for
     such fiscal quarter to Consolidated Total Interest Expense for such fiscal
     quarter to be less than the ratio set forth opposite such fiscal quarter in
     the table below (with such requirement not to be in effect for any quarter
     prior to the second fiscal quarter, 1999):


           Fiscal Quarter                                      Ratio
           --------------                                      -----

     2nd FQtr '99                                             1.5:1.0
     3rd FQtr '99                                             1.9:1.0
     4th FQtr '99                                             2.2:1.0
     1st FQtr '00 and thereafter                              2.5:1.0"

     ss.28. AMENDMENT OF ss.10.4 OF THE CREDIT AGREEMENT. Section 10.4 of the
Credit Agreement is hereby amended by deleting the first sentence thereof in its
entirety and substituting in lieu thereof the following new sentence:

          "The Borrower will not permit the Fixed Charge Coverage Ratio (a) for
     the four consecutive fiscal quarters of the Borrower ended August 1, 1998
     to be less than 0.69:1.0; and (b) for any other period of four consecutive
     fiscal quarters of the Borrower commencing with the four consecutive fiscal
     quarters ending with the third fiscal quarter, 1999 of the Borrower (with
     such requirement not to be in effect for the four consecutive fiscal
     quarter period ending with the fourth fiscal quarter, 1998 or the first or
     second fiscal quarters, 1999), to be less than 1.10:1.00."

     ss.29. ADDITION OF ss.ss.10.5 AND 10.6 TO THE CREDIT AGREEMENT. The Credit
Agreement is hereby amended by inserting, immediately after ss.10.4 of the
Credit Agreement and immediately before ss.11 of the Credit Agreement, the
following new ss.ss.10.5 and 10.6:

          "10.5. EBITDA TO INTEREST EXPENSE. The Borrower will not permit the
     ratio of EBITDA for any fiscal quarter ending in the table set forth below
     to Consolidated Total Interest Expense for such fiscal quarter to be less
     than the ratio set forth opposite such fiscal quarter in the table 

   30


                                      -30-

     below (with such requirement not to be in effect for any fiscal quarter of
     the Borrower after the first fiscal quarter, 1999):

             Fiscal Quarter                                        Ratio
             --------------                                        -----

     3rd FQtr '98                                                 1.70:1.0
     4th FQtr '98                                                 2.70:1.0
     1st FQtr '99                                                 3.15:1.0"

          "10.6. CAPITAL EXPENDITURES. The Borrower will not make, or permit any
     of its Subsidiaries to make, Capital Expenditures in any fiscal quarter of
     the Borrower commencing with the third fiscal quarter, 1998 through and
     including its fourth fiscal quarter, 1999, that exceed, in the aggregate,
     $22,500,000 PLUS, in the case of the fourth fiscal quarter, 1998, and the
     first, second, third and fourth fiscal quarters, 1999, of the Borrower,
     fifty percent (50%) of any amount permitted to be, but not actually,
     utilized during the immediately preceding fiscal quarter."

     ss.30. ADDITION OF ss.12.5 TO THE CREDIT AGREEMENT. The Credit Agreement is
hereby amended by inserting, immediately after ss.12.4 of the Credit Agreement
and immediately before ss.13 of the Credit Agreement the following new ss.12.5:

          "ss.12.5. BORROWING BASE REPORT. The Agent shall have received the
     most recent Borrowing Base Report required to be delivered to the Agent in
     accordance with ss.8.4(h) and, if requested by the Agent, a Borrowing Base
     Report dated within five (5) days of the Drawdown Date of such Loan or of
     the date of issuance, extension or renewal of such Letter of Credit."

     ss.31. AMENDMENT OF ss.13.1 OF THE CREDIT AGREEMENT. Section 13.1 of the
Credit Agreement is hereby amended by:

          (a) inserting, in subsection (b) thereof, immediately after the text
     "the Agent's Fee," and immediately before the text "or other sums due
     hereunder," the text "the usage fees,"

          (b) inserting, immediately before the semicolon (";") at the end of
     subsection (c) thereof the text: "or any of the covenants contained in any
     of the Security Documents".

          (c) deleting subsection (j) thereof in its entirety, and substituting
     the following new subsection (j) in lieu thereof:

               "(j) if any of the Loan Documents shall be cancelled, terminated,
          revoked or rescinded or the Agent's security interests, mortgages or
          liens in a substantial portion of the Collateral shall 

   31

                                      -31-


          cease to be perfected, or shall cease to have the priority
          contemplated by the Security Documents, in each case otherwise than in
          accordance with the terms thereof or with the express prior written
          agreement, consent or approval of the Banks, or any action at law,
          suit or in equity or other legal proceeding to cancel, revoke or
          rescind any of the Loan Documents shall be commenced by or on behalf
          of the Borrower or any of its Subsidiaries party thereto or any of
          their respective stockholders, or any court or any other governmental
          or regulatory authority or agency of competent jurisdiction shall make
          a determination that, or issue a judgment, order, decree or ruling to
          the effect that, any one or more of the Loan Documents is illegal,
          invalid or unenforceable in accordance with the terms thereof;"

          (d) amending subsection (m) thereof by inserting after the text "there
     shall occur" the text: "any material damage to, or loss, theft or
     destruction of, a substantial portion of the Collateral, whether or not
     insured or there shall occur";

          (e) deleting subsection (o) in its entirety and substituting in lieu
     thereof the following new subsection (o):

               "(o) the Borrower or any of the other Transaction Parties shall
          be indicted for a state or federal crime, or any civil or criminal
          action shall otherwise have been brought or threatened against the
          Borrower or any of the other Transaction Parties, a punishment for
          which in any such case could include the forfeiture of any assets
          (which phrase shall not be deemed to include any payment of money
          damages in connection with a criminal action or a civil suit not
          related to any forfeiture action) of the Borrower or such other
          Transaction Party included in the Borrowing Base or any assets of the
          Borrower or such other Transaction Party not included in the Borrowing
          Base but having a fair market value in excess of $1,000,000;"

     ss.32. ADDITION OF ss.13.4 TO THE CREDIT AGREEMENT. The Credit Agreement is
hereby amended by inserting, immediately after ss.ss.13.3 of the Credit
Agreement and immediately before ss.14 of the Credit Agreement, the following
new ss.13.4:

          "13.4 DISTRIBUTION OF COLLATERAL PROCEEDS. In the event that the Agent
     receives proceeds as contemplated by ss.2.11 or in the event that,
     following the occurrence and during the continuance of any Default or Event
     of Default, the Agent or any Bank, as the case may be, receives any monies
     in connection with the enforcement of any the Security Documents, or
     otherwise with respect to the realization upon any of the Collateral, such
     monies shall be distributed for application as follows:
   32

                                      -32-


               (a) First, to the payment of, or (as the case may be) the
          reimbursement of the Agent for or in respect of all reasonable costs,
          expenses, disbursements and losses which shall have been incurred or
          sustained by the Agent in connection with the collection of such
          monies by the Agent, for the exercise, protection or enforcement by
          the Agent of all or any of the rights, remedies, powers and privileges
          of the Agent under this Credit Agreement or any of the other Loan
          Documents or in respect of the Collateral or in support of any
          provision of adequate indemnity to the Agent against any taxes or
          liens which by law shall have, or may have, priority over the rights
          of the Agent to such monies;

               (b) Second, to all Swing Line Loans, in such order or preference
          as the Agent may determine;

               (c) Third, to all other Obligations in such order or preference
          as the Majority Banks may determine; PROVIDED, HOWEVER, that (i)
          distributions shall be made (A) PARI PASSU among Obligations with
          respect to the Agent's fees payable pursuant to ss.5.1 and all other
          Obligations (other than with respect to the Swing Line Loans) and (B)
          with respect to each type of Obligation owing to the Banks, such as
          interest, principal, fees and expenses, among the Banks PRO RATA, and
          (ii) the Agent may in its discretion make proper allowance to take
          into account any Obligations not then due and payable;

               (d) Fourth, upon payment and satisfaction in full or other
          provisions for payment in full satisfactory to the Banks and the Agent
          of all of the Obligations, to the payment of any obligations required
          to be paid pursuant to ss.9-504(1)(c) of the Uniform Commercial Code
          of the Commonwealth of Massachusetts; and

               (e) Fifth, the excess, if any, shall be returned to the Borrower
          or to such other Persons as are entitled thereto."

     ss.33. AMENDMENT OF ss.15.1(c) OF THE CREDIT AGREEMENT. Section 15.1(c) of
the Credit Agreement is hereby amended by inserting, at the end thereof, the
following additional sentence:

          "Such actions include the designation of the Agent as "secured party",
     "mortgagee" or the like on all financing statements and other documents and
     instruments, whether recorded or otherwise, relating to the attachment,
     perfection, priority or enforcement of any security interests, mortgages or
     deeds of trust in collateral security intended to secure the payment or
     performance of any of the Obligations, all for the benefit of the Banks and
     the Agent."

   33

                                     -33-


     ss.34. AMENDMENT OF ss.16 OF THE CREDIT AGREEMENT. Section 16 of the Credit
Agreement is hereby amended by:

          (a) deleting the word "and" immediately before clause (f) thereof;

          (b) inserting, immediately before the period (".") at the end thereof,
     the following text:

               "and (g) any fees, costs, expenses and bank charges, including
          bank charges for returned checks, incurred by the Agent in
          establishing, maintaining or handling agency accounts, lock box
          accounts and other accounts for the collection of any of the
          Collateral".

     ss.35. AMENDMENT OF ss.17 OF THE CREDIT AGREEMENT. Section 17 of the Credit
Agreement is hereby amended by:

          (a) deleting the word "or" in front of clause (c) thereof;

          (b) inserting, immediately before the proviso contend therein the
     following text:

               "or (d) the renewal or withdrawal of any provisional credits
          granted by the Agent upon the transfer of funds from lock box, bank
          agency or concentration accounts or in connection with the provisional
          honoring of checks or other items;".

     ss.36. REDUCTION OF TOTAL COMMITMENT PURSUANT TO SS.2.3 OF THE CREDIT
AGREEMENT. The Borrower hereby notifies the Agent and the Banks of the exercise
of its right pursuant to ss.2.3 of the Credit Agreement to reduce the Total
Commitment by $100,000,000 to $300,000,000, effective as of the Effective Date
(as hereinafter defined). In connection with such reduction, each of the Agent
and the Majority Banks hereby waives the requirement of ss.2.3 of the Credit
Agreement that the Borrower give seven (7) Business Days prior written notice to
the Agent of its intention to reduce the Total Commitment, and hereby agrees
that this Amendment shall constitute the notice from the Agent to the Banks of
such reduction required by ss.2.3 of the Credit Agreement. The Borrower hereby
agrees to pay to the Agent, for the respective accounts of the Banks, on the
Effective Date, the full amount of any commitment fee accrued on the amount of
such reduction of the Total Commitment.

     ss.37. REPLACEMENT OF SCHEDULES 1 AND 7.3 AND EXHIBIT C TO THE CREDIT
AGREEMENT; ADDITION OF SCHEDULES 7.6, 7.21, 7.22 AND 8.19 AND EXHIBIT F;
REVISION OF SCHEDULES 9.1 AND 9.2. SCHEDULES 1 and 7.3 and EXHIBIT C to the
Credit Agreement are hereby deleted in their entirety, and SCHEDULES 1 and 7.3
and EXHIBIT C attached hereto are hereby respectively substituted in lieu
thereof. SCHEDULES 7.6, 7.21, 7.22 and 8.19 and EXHIBIT F 

   34

                                      -34-

attached hereto are hereby respectively added as schedules and exhibits to the
Credit Agreement. SCHEDULE 9.1 to the Credit Agreement is hereby amended by
supplementing the reference to the "Bank Line of Credit" of Hadco Malaysia to
permit Indebtedness under such Bank Line of Credit in an aggregate amount not to
exceed $5,000,000 or the equivalent thereof in other applicable currencies at
any time. SCHEDULE 9.1 and SCHEDULE 9.2 to the Credit Agreement are hereby
amended by adding thereto the two items listed on SCHEDULE 7.3 hereto under the
heading "Additions since Balance Sheet Date of October 25, 1997".

     ss.38. CONDITIONS TO EFFECTIVENESS. This Amendment shall be deemed to be
effective as of September 14, 1998 (the "Effective Date") (PROVIDED, HOWEVER,
that ss.ss.27 and 28 shall be deemed to be effective as of July 30, 1998), upon
the Agent's receipt of the following, each in form and substance satisfactory to
the Agent:

          (a) facsimile copies of original counterparts (to be followed promptly
     by original counterparts) or original counterparts of (i) this Amendment,
     duly executed by each of the Borrower, the Guarantors, the Agent and the
     Majority Banks, and (ii) each of the Security Documents (as defined in the
     Credit Agreement, as amended hereby), each duly executed by the Borrower
     and/or each Guarantor party thereto;

          (b) payment to the Agent in cash, for the account of each Bank, (i) an
     amendment fee of $375,000, $187,500 of which has already been paid and
     distributed to the Banks and (ii) the amount of the commitment fee accrued
     on the $100,000,000 reduction of the Total Commitment pursuant to ss.36;

          (c) a duly executed Secretary's certificate of the Secretary or
     Assistant Secretary of the Borrower and each Guarantor certifying (and
     where applicable, attaching copies of) the Borrower's or such Guarantor's
     (i) Charter documents; (ii) By-laws; (iii) resolutions of its Board of
     Directors authorizing the transactions contemplated hereby; and (iv) the
     incumbency of officers entitled to sign this Amendment and the Security
     Documents on behalf of the Borrower or such Guarantor, as the case may be;

          (d) good standing certificates for each of the Borrower and the
     Guarantors from its jurisdiction of incorporation and from each
     jurisdiction in which such entity has qualified to do business as a foreign
     corporation;

          (e) favorable legal opinions from Hamilton & Dahmen, LLP and New York
     local counsel;

          (f) duly executed UCC-1 financing statements showing the Borrower
     and/or the Guarantor as debtors in each such jurisdiction;

   35

                                      -35-


          (g) stock certificates and duly executed blank stock powers with
     respect to all shares of capital stock pledged pursuant to any of the Stock
     Pledge Agreements other than those stock certificates and stock powers
     referenced in ss.ss.8-10 of SCHEDULE 8.19 hereto;

          (h) intentionally omitted;

          (i) an initial Borrowing Base Report;

          (j) an initial Accounts Receivable aging report;

          (k) a duly executed Perfection Certificate (as defined in the Security
     Agreement) from each of the Borrower and each Guarantor; and

          (l) such other documents, agreements and items as the Agent may
     require, including, without limitation, execution and delivery, together
     with performance of the agreements and delivery of the items specified
     therein, of a fee letter satisfactory in form and substance to the Agent,
     duly executed by the Agent and the Borrower.

     ss.39. REPRESENTATIONS AND WARRANTIES; NO DEFAULT; AUTHORIZATION. Each of
the Borrower and the Guarantors hereby represents and warrants to each of the
Agent and the Banks as follows:

          (a) Each of the representations and warranties of the Borrower and the
     Guarantors contained in the Credit Agreement, the other Loan Documents or
     in any document or instrument delivered pursuant to or in connection with
     the Credit Agreement, the other Loan Documents or this Amendment was true
     as of the date as of which it was made, and no Default or Event of Default
     has occurred and is continuing as of the date of this Amendment or would
     occur after giving effect to the transactions contemplated by this
     Amendment; and

          (b) This Amendment has been duly authorized, executed and delivered by
     the Borrower and each of the Guarantors, and shall be in full force and
     effect upon the satisfaction of the conditions set forth in ss.38 hereof,
     and the agreements of the Borrower and each of the Guarantors contained
     herein, in the Credit Agreement as herein amended, or in the other Loan
     Documents respectively, constitute the legal, valid and binding obligations
     of the Borrower and each of the Guarantors party hereto or thereto,
     enforceable against the Borrower or such Guarantor, in accordance with
     their respective terms, except as enforceability is limited by bankruptcy,
     insolvency, reorganization, moratorium or other laws relating to or
     affecting generally the enforcement of creditors' rights and except to the
     extent that availability of the remedy of specific performance or
     injunctive relief is subject to the discretion of the court before which
     any proceeding therefor may be brought.

   36

                                      -36-


     ss.40. RATIFICATION, ETC. Except as expressly amended hereby, the Credit
Agreement, the other Loan Documents and all documents, instruments and
agreements related thereto are hereby ratified and confirmed in all respects and
shall continue in full force and effect. All references in the Credit Agreement
or such other Loan Documents or in any related agreement or instrument to the
Credit Agreement or such other Loan Documents shall hereafter refer to such
agreements as amended hereby, pursuant to the provisions of the Credit
Agreement.

     ss.41. NO PRESENT CLAIMS. In order to eliminate any possibility that any
past conditions, acts, omissions, events, circumstances or matters would impair
or otherwise adversely affect any of the rights, interests, contracts,
collateral security or remedies of the Agent or any of the Banks, each of the
Borrower and the Guarantors hereby acknowledges and agrees that: (i) neither it
nor any of the other Transaction Parties has any claim or cause of action
against the Agent, any of the Banks or any of their directors, officers,
employees or agents; (ii) neither it nor any of the other Transaction Parties
has any offset right, counterclaim or defense of any kind against any of its
obligations, indebtedness or liabilities to the Agent and/or the Banks,
including, without limitation, the Obligations; and (iii) each of the Agent and
the Banks has heretofore properly performed and satisfied in a timely manner all
of its obligations to each of the Borrower and the other Transaction Parties.

     ss.42. EXPENSES. Without limiting the expense reimbursement requirements
set forth in ss.16 of the Credit Agreement, the Borrower agrees to pay on demand
all costs and expenses, including reasonable attorneys' fees, of the Agent
incurred in connection with this Amendment.

     ss.43. NO IMPLIED WAIVER, ETC. Except as expressly provided herein, nothing
contained herein shall constitute a waiver of, impair or otherwise affect any of
the Obligations, any other obligations of the Borrower or any of the Transaction
Parties or any right of the Agent or the Banks consequent thereon. The waivers
and consents provided herein are limited strictly to their terms. Neither the
Agent nor any of the Banks shall have any obligation to issue any further waiver
or consent with respect to the subject matter hereof or any other matter.

     ss.44. COUNTERPARTS. This Amendment may be executed in one or more
counterparts, each of which shall be deemed an original but which together shall
constitute one and the same instrument.

     ss.45. GOVERNING LAW. THIS AMENDMENT SHALL FOR ALL PURPOSES BE GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS
(WITHOUT REFERENCE TO CHOICE OR CONFLICTS OF LAWS).

   37

                                      -37-


     IN WITNESS WHEREOF, the parties hereto have executed this Amendment as a
document under seal as of the date first above written.


                                HADCO CORPORATION



                                By:  /s/ Timothy P. Losik
                                     -------------------------------------------
                                     Name: Timothy P. Losik
                                     Title: Senior VP, CFO, Treasurer

                                BANKBOSTON, N.A., individually and as Agent



                                By:  /s/ Jeffrey G. Millman
                                     -------------------------------------------
                                     Name: Jeffrey G. Millman
                                     Title:  Vice President


                                ABN AMRO BANK N.V.



                                By:  /s/ Bruce W. Swords / Dave A. Carroll
                                     -------------------------------------------
                                     Name: Bruce W. Swords   Dave A. Carroll
                                     Title: Vice President      Officer

                                THE BANK OF TOKYO - MITSUBISHI TRUST COMPANY



                                By:  /s/ Jim Brown
                                     -------------------------------------------
                                     Name: Jim Brown
                                     Title: Vice President

                                THE FIRST NATIONAL BANK OF CHICAGO



                                By:  /s/ Robert McMillan
                                     -------------------------------------------
                                     Name: Robert McMillan
                                     Title: Corporate Banking Officer

   38


                                      -38-


                                KEYBANK NATIONAL ASSOCIATION.


                                By:  /s/ Lawrence A. Mack
                                     -------------------------------------------
                                     Name: Lawrence A. Mack
                                     Title: Senior Vice President


                                BANK OF AMERICA NATIONAL TRUST AND 
                                SAVINGS ASSOCIATION


                                By:  /s/ Brian K. Chin
                                     -------------------------------------------
                                     Name: Brian K. Chin
                                     Title: Vice President


                                THE BANK OF NOVA SCOTIA


                                By:  /s/ Terrence M. Pitcher
                                     -------------------------------------------
                                     Name: Terrence M. Pitcher
                                     Title: Vice President


                                THE FUJI BANK, LIMITED


                                By:  /s/ Teiji Teramoto
                                     -------------------------------------------
                                     Name: Teiji Teramoto
                                     Title: Vice President & Manager


                                SUNTRUST BANK, ATLANTA


                                By:  /s/ Melissa Swint
                                     -------------------------------------------
                                     Name: Melissa Swint
                                     Title: Operations Officer

                                By:  /s/ W. David Wisdom
                                     -------------------------------------------
                                     Name: W. David Wisdom
                                     Title: Group Vice President


                                THE INDUSTRIAL BANK OF JAPAN, LIMITED


                                By: 
                                     -------------------------------------------
                                     Name:
                                     Title:
   39

                                      -39-

                                FIRST UNION NATIONAL BANK, 
                                successor by merger to CORESTATES BANK, N.A.



                                By:  /s/ Robert A. Brown
                                     -------------------------------------------
                                     Name: Robert A. Brown
                                     Title: Vice President

                                STATE STREET BANK AND TRUST COMPANY



                                By:  /s/ Bruce S. Daniels
                                     -------------------------------------------
                                     Name: Bruce S. Daniels
                                     Title: Vice President

                                MELLON BANK, N.A.



                                By:  /s/ R. Jane Westrich
                                     -------------------------------------------
                                     Name: R. Jane Westrich
                                     Title: Vice President

                                THE SANWA BANK, LIMITED



                                By: 
                                     -------------------------------------------
                                     Name:
                                     Title:

                                USTRUST



                                By:  /s/ Daniel G. Eastman
                                     -------------------------------------------
                                     Name: Daniel G. Eastman
                                     Title: Vice President


   40

                                      -40-


Each of the undersigned hereby acknowledges the foregoing Amendment as of the
Effective Date and agrees that its obligations under the Guaranty to which it is
a party will extend to the Agreement, as so amended, and the other Loan
Documents, as so amended.


                                      HADCO SANTA CLARA, INC.



                                      By: /s/ Timothy P. Losik
                                         --------------------------------------
                                         Title: Senior VP, CFO, Treasurer


                                      HADCO PHOENIX, INC.


                                      By: /s/ Timothy P. Losik
                                         --------------------------------------
                                         Title: Senior VP, Treasurer


                                      CCIR OF CALIFORNIA CORP.


                                      By: /s/ Timothy P. Losik
                                         --------------------------------------
                                         Title: CFO, Treasurer


                                      CCIR OF TEXAS CORP.


                                      By: /s/ Timothy P. Losik
                                         --------------------------------------
                                         Title: CFO, Treasurer