Exhibit 2.1

                            BUSINESS SALES AGREEMENT
                            ------------------------

                                August 21, 1997



     This BUSINESS SALE AGREEMENT (hereafter, this "Agreement") is made as of
the 21st day of August, 1997, by and between Alphatec USA, Inc., a California
corporation (including, unless otherwise specifically noted or unless the
context otherwise requires, Digital Testing Services, Inc., collectively
"SELLER"); and ISE Labs, Inc., a California corporation ("BUYER").


                              W I T N E S S E T H:


     WHEREAS, SELLER conducts the Contract Assembly Business (as such term is
defined below) at the Facility (as such term is defined below), and the
Integrated Circuit Test Business (as such term is defined below) at the Leased
Premises (as such term is defined below) through its wholly owned subsidiary
Digital Testing Services, Inc. ("DTS"); and

     WHEREAS, BUYER desires to acquire the Contract Assembly Business and the
Integrated Circuit Test Business from SELLER, upon the terms specifically
provided herein and in the exhibits attached hereto.

     NOW, THEREFORE, in consideration of the representations, warranties,
agreements and covenants hereinafter set forth and other good and valuable
consideration, the receipt of which is hereby acknowledged and agreed, the
parties agree as follows:

                                   ARTICLE 1
                                  DEFINITIONS
                                  -----------


1.1  Definitions.  For purposes of this Agreement, the following terms shall
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     have the following meanings:

     1.1.1  "Business" shall mean the "Integrated Circuit Test Business" and the
            "Contract Assembly Business."

     1.1.2  "Integrated Circuit Test Business" shall mean the business of
            providing testing services performed by DTS.

 
     1.1.3  "Facility" shall mean Alphatec USA, Inc.'s facility in Manteca,
            California including the Land (as such term is defined in Section
            2.2.3 hereof).

     1.1.4  "Contract Assembly Business" shall mean the business of contract
            assembly of electronic devices into electronic packages.

     1.1.5  "Leased Premises" shall mean the building located at 3600 Peterson
            Way, Santa Clara, CA 95054.

     1.1.6  "Closing Date" shall be September 15, 1997 or when all conditions to
            Closing specified in Article 6 are satisfied or waived.

     1.1.7  "Inventory" shall mean the piece parts and materials, spare parts,
            office supplies, and other items used in the Contract Assembly
            Business and listed, and items of a character similar to those
            listed, on Schedule 1.1.7 and owned by SELLER on the Closing Date.


                                   ARTICLE 2
                               PURCHASE AND SALE
                               -----------------


2.1  Business Purchases.  On the Closing Date, BUYER shall purchase from SELLER,
     ------------------                                                         
     and SELLER shall sell, transfer, assign and convey to BUYER:

     2.1.1  the Contract Assembly Business, such purchase and sale to include
            the transfer to BUYER of the Purchased Assets (as such term is
            defined in Section 2.2 hereof) and the assumption by BUYER of the
            Assumed Liabilities (as such term is defined in Section 2.4 hereof),
            and

     2.1.2  all of the outstanding securities of DTS.

2.2  Purchased Assets.  The purchase of the Assembly Business shall include the
     ----------------                                                          
     transfer to BUYER of the following assets:

     2.2.1  Inventory:  all the Inventory located at the Facility;
            ---------                                             

     2.2.2  Equipment:  the machinery and equipment of the Contract Assembly
            ---------                                                       
            Business as of the Closing Date and listed on Schedule 2.2.2 (the
            "Assembly Equipment");

     2.2.3  Land:  the real property owned by SELLER more particularly described
            ----                                                                
            in Schedule 2.2.3 hereof (the "Land"), together with all buildings
            and other real property improvements situated on the Land;

                                       2

 
     2.2.4   Know-How:  the trade secrets, tradenames, know-how and other
             --------                                                    
             intellectual property and proprietary information of SELLER related
             to the Contract Assembly Business;

     2.2.5   any and all cash and bank accounts of SELLER and its subsidiary and
             affiliated companies;

     2.2.6   accounts and notes receivable (other than intercompany receivables)
             (for purposes of this Subsection 2.2.6, accounts and notes
             receivable shall mean those receivables applicable to services
             performed and/or product shipped by SELLER including DTS at any
             time prior to 12:01 a.m. on the Closing Date, and are referred to
             herein as the "Receivables");

     2.2.7   except for the suppliers contracts referred to in Section 2.3.3,
             all claims and rights under all agreements, contracts, licenses,
             leases, franchises, instruments, documents, purchase and sale
             orders and other executory commitments, and all permits, consents,
             and certificates of any regulatory, administrative or other
             governmental agency or body;

     2.2.8   all rights under express or implied warranties from suppliers of
             SELLER;

     2.2.9   all leasehold interests of SELLER listed on Schedule 2.2.9 hereto;

     2.2.10  all other assets of the Business not specifically referred to in
             this Section 2.2, other than the Excluded Assets; and

     2.2.11  all THREE HUNDRED FIFTY THOUSAND shares of the issued and
             outstanding shares of Common Stock of DTS.

(collectively the "Purchased Assets"; provided, however, that the Purchased
Assets shall not include the Excluded Assets as such term is defined in Section
2.3 hereof).  BUYER shall take delivery and possession of the Purchased Assets
upon the Closing Date.

2.3  Excluded Assets.  Notwithstanding any other provision of this Agreement,
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     SELLER shall not transfer to Buyer any of the following:

     2.3.1   any and all intercompany accounts receivables and payables of
             SELLER and its subsidiary and affiliated companies;

     2.3.2   all insurance policies of SELLER pertaining to the Purchased Assets
             and all rights of SELLER of every nature and description under or
             arising out of such insurance policies;

                                       3

 
     2.3.3  all losses, carryovers and rights to receive refunds from suppliers
            or with respect to any and all taxes of SELLER including DTS of
            every nature and description, including interest payable with
            respect thereto;

     2.3.4  the books and records of account and all supporting vouchers,
            invoices and other records, and records and materials relating to
            any or all taxes of SELLER including DTS (provided that, following
            the Closing, SELLER shall grant BUYER access thereto during business
            hours on reasonable notice).

     If an asset of the Contract Assembly Business is not specifically listed as
     an Excluded Asset under Section 2.3 of this Agreement, it shall be deemed a
     Purchased Asset and shall be conveyed to Buyer pursuant to this Agreement.

2.4  Obligations.
     ----------- 

     2.4.1  Assumed Liabilities.
            ------------------- 

            2.4.1.1  Definition.  The Buyer covenants and agrees that it shall
                     ----------                                               
            only assume those liabilities of Alphatec USA, Inc. (excluding DTS)
            that are specifically listed on Schedule 2.4.1.1 (the "Assumed
            Liabilities"). Alphatec USA, Inc. (excluding DTS) covenants to and
            agrees with BUYER that all other liabilities and obligations of
            Alphatec USA, Inc. (excluding DTS) shall remain the sole obligation
            of Alphatec USA, Inc. and BUYER shall not be responsible for any
            other liabilities and obligations of Alphatec USA, Inc. (excluding
            DTS) or any of its parents or other affiliates.

            2.4.1.2  Unfilled Orders.  Any orders for assembly or testing by
                     ---------------                                        
            SELLER received or communicated in the ordinary course of business
            that had not been completed or shipped prior to 12:01 a.m. of the
            Closing Date, as listed on Schedule 2.4.1.2, shall be transferred to
            BUYER at the Closing and BUYER shall be responsible for filling such
            orders and shall be entitled to the revenues generated therefrom
            (including advance payments).

            2.4.1.3  Assignment and Assumption Agreement.  On the Closing Date,
                     -----------------------------------                       
            SELLER and BUYER shall execute an assignment and assumption
            agreement, substantially in the form of Exhibit 2.4.1.3 attached
            hereto (the "Assignment and Assumption Agreement"), as evidence to
            third parties of SELLER's assignment and transfer to BUYER of all of
            SELLER's right, title and interest to the Purchased Assets, and
            BUYER's assumption and agreement to thereafter fully and timely
            perform and discharge in accordance with their terms, the Assumed
            Liabilities.

     2.4.2  Liabilities and Obligations.  For the purposes of this Section 2.4,
            ---------------------------                                        
            the term "liabilities and obligations" means all liabilities,
            obligations, indebtedness,

                                       4

 
          losses, damages, deficiencies, or responsibilities, fixed or unfixed,
          now existing or hereafter arising, known or unknown, secured or
          unsecured, accrued, absolute, contingent or otherwise, whether caused
          by any action or failure to act, whether arising out of contract or
          tort (including negligence) or from any other cause.

2.5  Bill of Sale.  On the Closing Date, SELLER shall execute a bill of sale,
     ------------                                                            
     substantially in the form of Exhibit 2.5 hereto, conveying the Purchased
     Assets to BUYER ("Bill of Sale").

2.6  Land.  On the Closing Date, SELLER shall execute a deed, substantially in
     ----                                                                     
     the form of Exhibit 2.6 attached hereto, conveying the Land to BUYER (the
     "Deed").

2.7  Stock.  On the Closing Date, SELLER shall deliver a stock certificate for
     -----                                                                    
     350,000 shares of DTS Common Stock, duly endorsed to BUYER, representing
     all of the issued and outstanding shares of DTS.

2.8  Personnel; Employee Meetings.  From and after the date hereof,
     ----------------------------                                  
     representatives of BUYER shall be entitled to hold an initial meeting with
     the employees of Seller upon reasonable notice to SELLER to explain and
     answer questions, policies and benefits of employment under BUYER.
     Thereafter, until the Closing, SELLER shall cooperate with BUYER in
     communicating to the employees any additional information concerning
     employment under BUYER that the employees may seek, or which BUYER may
     desire to provide, and during normal working hours shall allow such
     additional meetings by representatives of BUYER with employees as BUYER may
     request.  SELLER shall be entitled to have one or more representatives
     attend all such meetings.


                                   ARTICLE 3
                                 PURCHASE PRICE
                                 --------------


3.1  Price.  Subject to the terms of this Agreement, as consideration for the
     -----                                                                   
     Purchased Assets, BUYER shall pay SELLER THIRTY MILLION DOLLARS
     ($30,000,000) (the "Purchase Price").

3.2  Allocation.  The Purchase Price shall be allocated as mutually agreed upon
     ----------                                                                
     by BUYER and SELLER as set forth in Exhibit 3.2 attached hereto.  Following
     the date hereof, the parties may modify Exhibit 3.2 by mutual written
     agreement.  BUYER and SELLER agree to prepare their respective federal,
     state, local and foreign tax returns in a manner consistent with such
     allocation and Section 9.12.

                                       5

 
3.3  Method of Payment.  The Purchase Price shall be paid in immediately
     -----------------                                                  
     available funds on the Closing Date.

3.4  Taxes.  BUYER shall pay all sales, use, transfer, registration, stamp, or
     -----                                                                    
     other similar taxes or duties (collectively "Transfer Taxes") arising out
     of or incurred in connection with the transfers of Purchased Assets
     pursuant to this Agreement.  Notwithstanding the foregoing, BUYER shall
     have no liability to SELLER with respect to any income taxes or any other
     taxes measured by the affairs of SELLER or SELLER's affiliates.


                                   ARTICLE 4
                         REPRESENTATIONS AND WARRANTIES


4.1  Of SELLER.  SELLER (which includes DTS) hereby represents and warrants to
     ---------                                                                
     BUYER as follows and agrees with BUYER that the following representations
     and warranties shall be true and correct on the Closing Date:

     4.1.1  SELLER Organization.  SELLER has been duly incorporated, and is
            -------------------                                            
            validly existing as a corporation in good standing under the laws of
            the State of California and has the corporate power to carry on its
            business as now conducted and has full power and authority under
            such laws to execute, deliver and perform this Agreement. Alphatec
            USA, Inc. owns all of the shares of capital stock of DTS, free and
            clear of all liens. The SELLER does not have any subsidiaries, other
            than DTS. SELLER is not required to be qualified in any other
            jurisdiction and all of the assets of the Business are located in
            California.

     4.1.2  Corporate Authority.  SELLER has full power and authority to enter
            -------------------                                               
            into this Agreement and the related agreements, to perform its
            obligations hereunder and thereunder, and to consummate the
            transactions contemplated hereby and thereby, including, without
            limitation, the execution and delivery of this Agreement, general
            conveyances, bills of sale, assignments, and other documents and
            instruments evidencing the conveyance of the Purchased Assets or
            delivered in accordance with this Agreement and agreements related
            hereto. No other proceedings on the part of SELLER or any affiliate
            are necessary to authorize this Agreement and the related agreements
            or to consummate the transactions contemplated hereby and thereby,
            except as may be required under the Hart-Scott-Rodino Antitrust
            Improvements Act of 1976, as amended ("HSR"). All corporate actions
            have been taken by SELLER and each affiliated party that are
            necessary for the due authorization, execution and delivery of this
            Agreement and the performance of the obligations of SELLER
            hereunder. This Agreement constitutes the legal, valid, and binding
            obligation of SELLER, enforceable against SELLER in accordance with
            its terms, subject

                                       6

 
            to any equitable principles limiting the right to obtain specific
            performance of certain obligations of SELLER hereunder. Except as
            provided in Schedule 4.1.2 hereto, the execution and delivery of
            this Agreement and such other agreements and instruments and the
            consummation of the transactions contemplated hereby and thereby do
            not and will not violate any law, regulation, rule, injunction or
            court order, or the provisions of SELLER's Articles of Incorporation
            or By-Laws, or of any note, indenture, mortgage, lease, license
            agreement or other agreement or instrument to which SELLER or any
            affiliated party is party or by which SELLER or any affiliated party
            is bound or of which SELLER or any affiliated party is maker, or
            result in the creation of any lien, charge or encumbrance upon the
            Purchased Assets or any asset of DTS to be sold hereunder.

     4.1.3  Land.  Alphatec USA, Inc. is the owner of the Land in fee simple,
            ----                                                             
            except for (i) easements that are a matter of public record, (ii)
            liens for taxes not yet due and payable and listed on Schedule
            4.1.3, and (iii) any items listed on Schedule 4.1.3 attached hereto.

     4.1.4  Consents.  Except as provided in Schedule 4.1.4, attached hereto, no
            --------                                                            
            consent, approval, waiver, license, authorization or declaration of,
            or filing or registration with, any person, firm, corporation or
            other entity, including, without limitation, any lender, mortgagee,
            governmental authority, bureau or agency is required in connection
            with the execution, delivery and performance by SELLER of this
            Agreement or the consummation of the transactions contemplated
            hereby, except for HSR.

     4.1.5  Litigation.  Other than complaints and threats of litigation
            ----------                                                  
            received from time to time from customers of SELLER, each of which
            is listed on Schedule 4.1.5, and as otherwise specifically provided
            in Schedule 4.1.5 hereto, to the best of the knowledge of the
            officers of SELLER, SELLER is not in violation of, or in default
            with respect to, any order, judgment or decree affecting the
            Business or the Purchased Assets that would materially impair the
            ability of BUYER to conduct the Business following the Closing Date,
            nor is it required to take remedial action in order to avoid such
            violation or default. There is no claim, investigation, litigation,
            action, suit, or proceeding, administrative or judicial, pending or
            threatened against SELLER or any officer or director of SELLER, or
            involving the Purchased Assets or assets of DTS, at law or in
            equity, before any federal, state, local, or foreign court, or
            regulatory agency, or other governmental authority, including,
            without limitation, any unfair labor practice or grievance
            proceedings or otherwise. SELLER has not received any complaints
            from any of its customers or suppliers within the last six months,
            which complaints could reasonably be expected individually or in the
            aggregate, to have a potential adverse effect on the Business,
            Purchased Assets, prospects, operations, employee relations, rights
            or condition of the SELLER.

                                       7

 
     4.1.6  Leases.  Schedule 4.1.6 contains a complete and correct list of all
            ------                                                             
            material leases under which SELLER is a party used in connection
            with the Business. For purposes of this Section 4.1.6 a "material"
            lease is a lease which provides for the payment of annual rent of
            $50,000 or more. SELLER has made, or will make, available to BUYER a
            complete and correct copy of each lease set forth in Schedule 4.1.6
            and each such lease is in full force and effect. All rents and
            additional rents due to date on each such lease have been paid
            except as disclosed in Schedule 4.1.6 and, in the case of the lease
            of real property, the lessee has had quiet enjoyment of the premises
            since the commencement of the original term of such lease.

     4.1.7  Employee Benefit Plans.  Schedule 4.1.7 contains a true and complete
            ----------------------                                              
            list of each plan contract, program and arrangement evidencing an
            employee benefit plan maintained, contributed to, or required to be
            contributed to, by SELLER (and any other entity that is under common
            control or affiliated with SELLER (an "ERISA Affiliate") within the
            meaning of Section 4001 of the Employee Retirement Income Security
            Act of 1984, as amended ("ERISA") and the rules and regulations
            promulgated thereunder and/or Sections 414(b), (c), (m) or (l) of
            the Internal Revenue Code of 1986, as amended the ("Code"), and the
            rules and regulations promulgated thereunder) for the benefit of any
            employee, director or agent employed, or retained with respect to
            the Contract Assembly Business in the United States ("Plan
            Beneficiaries"), whether or not any of the foregoing is funded,
            whether or not required by law, whether formal or informal, whether
            or not subject to ERISA, and whether or not legally binding
            (collectively, the "Benefit Plans"). SELLER has no formal plan or
            commitment, whether legally binding or not, to create any additional
            plan with respect to the Business or modify or change any existing
            Benefit Plan that would affect any Plan Beneficiary, except as
            required by applicable law, including the Tax Reform Act of 1986, as
            amended ("TRA"). SELLER has delivered to BUYER (i) true and complete
            copies of all documents embodying or relating to the Benefit Plans,
            all amendments to the Benefit Plans, and any trust or other funding
            arrangement, and (ii) a copy of the most recent summary plan
            description relating to each such Benefit Plan.

     4.1.8  Absence of Certain Changes and Events.  Since December 31, 1996,
            -------------------------------------                           
            there has not been any material adverse change in the financial
            condition, results of operation, assets, liabilities, business, or
            prospects of SELLER or any occurrence, circumstance, or combination
            thereof which reasonably could be expected to result in any such
            material adverse change;

     4.1.9  Undisclosed Liabilities.  There are no debts, liabilities or
            -----------------------                                     
            obligations with respect to SELLER or to which the Purchased Assets
            or assets of DTS are subject, liquidated, unliquidated, accrued,
            absolute, contingent, or otherwise,

                                       8

 
             that are not specifically identified in Schedule 2.4.1.1 or have
             been retained by SELLER.

     4.1.10  Inventory; Accounts Receivable.  All Inventory of Alphatec USA,
             ------------------------------                                 
             Inc. and all items to be delivered to Alphatec USA, Inc. or have
             been retained by SELLER for Inventory after the Closing that are
             subject to purchase commitments outstanding at the Closing, consist
             of items that are or upon delivery will be good and merchantable
             and of a quality and quantity presently usable and saleable in the
             ordinary course of business. All of the Receivables are good and
             fully collectible in the ordinary course of business and there are
             no claims, setoffs or counterclaims in existence with respect
             thereto.

     4.1.11  Properties.  SELLER has good, valid and marketable title to all
             ----------                                                     
             property and Purchased Assets and assets of DTS, tangible and
             intangible, purported to be owned by it, including the property and
             Purchased Assets and assets of DTS reflected on the SELLER
             Financial Statements (as defined in Section 4.1.27 herein). All
             such property and Purchased Assets and assets of DTS purported to
             be owned by SELLER are free and clear of all mortgages, liens,
             charges, security interests or other encumbrances of any nature
             whatsoever. All property and Purchased Assets and assets of DTS,
             including machinery and equipment, owned, leased or otherwise used
             by the SELLER are in good operating condition and repair,
             reasonable wear and tear excepted, and are suitable and adequate
             for use in the ordinary course of business and conform in all
             material respects to all applicable laws. All leases are binding,
             valid and enforceable in accordance with their terms subject to the
             effect, if any, of (i) applicable bankruptcy and other similar laws
             affecting the rights of creditors generally, and (ii) rules of law
             governing specific performance, injunctive relief and other
             equitable remedies, and there are no current defaults or events
             which have occurred with which the giving of notice or lapse of
             time or both would constitute a material default under any lease.
             After the Closing, BUYER will be entitled to the continued use and
             possession of the leased property by it, for the terms specified in
             such leases and for the purposes for which such property is used.
             There is no pending or threatened condemnation or similar
             proceeding affecting any of the real property owned or leased by
             SELLER.

     4.1.12  Taxes.
             ----- 

             4.1.12.1  All Taxes (as hereinafter defined) due or payable by
                       SELLER, and all interest and penalties thereon, whether
                       disputed or not, other than Taxes which are not yet due
                       and payable, have been paid in full. All Tax returns,
                       statements, reports, forms and other documents required
                       to be filed in connection therewith have been duly and
                       timely filed (and no extension of any filing date
                       applicable thereto has been requested or granted) and
                       were

                                       9

 
                    correct and complete in all respects.  All deposits required
                    by law to be made by SELLER with respect to employees' with
                    holding taxes have been duly made.  SELLER is not delinquent
                    in the payment of any Tax, assessment or governmental charge
                    or deposit, and SELLER does not have any Tax deficiency or
                    claim currently pending, outstanding or asserted against it,
                    and there is no basis for any such Tax deficiency or claim.
                    There is no audit currently pending regarding any Taxes and
                    SELLER has not extended the period in which any Tax could be
                    assessed or collected.

          4.1.12.2  No Tax is required to be withheld pursuant to Section 1445
                    of the Internal Revenue Code as a result of the transfers
                    contemplated by this Agreement, and SELLER is not a person
                    other than a United States person within the meaning of the
                    Code.  There are no liens for Taxes upon the Purchased
                    Assets and assets of DTS except liens for current immaterial
                    amounts of Taxes not yet due.  There is no contract,
                    agreement, plan or arrangement, including but not limited to
                    the provisions of this Agreement, covering any employee or
                    independent contractor or former employee or independent
                    contractor of SELLER that, individually or collectively,
                    could give rise to the payment by SELLER of any amount that
                    would not be deductible pursuant to Section 280G or Section
                    162 of the Code.  None of the assets (including the
                    Purchased Assets) of SELLER (i) is property that is required
                    to be treated as owned by any other person pursuant to the
                    so-called "safe harbor lease" provisions of former Section
                    168(f)(8) of the Code, (ii) directly or indirectly secures
                    any debt the interest on which is tax exempt under Section
                    103(a) of the Code or (iii) is "tax exempt use property"
                    within the meaning of Section 168(h) of the Code.  The
                    transactions contemplated herein are not subject to the tax
                    withholding provisions of Code Section 3406, or of
                    Subchapter A of Chapter 3 of the Code or of any other
                    provision of law in any jurisdiction.

          4.1.12.3  No governmental entity (a "Taxing Authority") responsible
                    for the imposition of any Tax (domestic or foreign) has
                    asserted jurisdiction to impose any Taxes upon SELLER.

          4.1.12.4  There is no contract, agreement, plan or arrangement,
                    including but not limited to the provisions of this
                    Agreement, covering any employee or independent contractor
                    or former employee or independent contractor of SELLER that,
                    individually or collectively, could give rise to the payment
                    by SELLER of any

                                       10

 
                    amount that would not be deductible pursuant to Section 280G
                    or Section 162 of the Code.  None of the assets (including
                    the Purchased Assets) of SELLER (i) is property this is
                    required to be treated as owned by any other person pursuant
                    to the so-called "safe harbor lease" provisions of former
                    Section 168(f)(8) of the Code, (ii) directly or indirectly
                    secures any debt the interest on which is tax exempt under
                    Section 103(a) of the Code or (iii) is "tax exempt use
                    property" within the meaning of Section 168(h) of the Code.
                    The transactions contemplated herein are not subject to the
                    tax withholding provisions of Code Section 3406, or of
                    Subchapter A of Chapter 3 of the Code or of any other
                    provision of law in any jurisdiction.  The SELLER is not and
                    has never been a member of a group permitted or required to
                    file consolidated Tax returns and is not party to any
                    agreement relating to the payment or sharing of liability
                    for Taxes.  SELLER has not filed a consent under Section
                    341(f) of the Code.

          4.1.12.5  For purposes of this Agreement, "Tax" (and, with correlative
                    meaning, "Taxes" and "Taxable") means (i) any net income,
                    alternative or add-on minimum tax, gross income, gross
                    receipts, sales, use, ad valorem, transfer, franchise,
                    profits, license, withholding, payroll, employment, excise,
                    severance, stamp, occupation, premium, property,
                    environmental or windfall profit tax, custom, duty or other
                    tax, governmental fee or other like assessment or charge of
                    any kind whatsoever, together with any interest or any
                    penalty, addition to tax or additional amount imposed by any
                    Taxing Authority responsible for the imposition of any such
                    tax (domestic or foreign), (ii) any liability for the
                    payment of any amounts of the type described in (i) as a
                    result of being a member of an affiliated, consolidated,
                    combined or unitary group for any Taxable period and (iii)
                    any liability for the payment of any amounts of the type
                    described in (i) or (ii) as a result of any express or
                    implied obligation to indemnify any other person.

  4.1.13  Compliance with Laws. SELLER has complied and is in compliance with
          --------------------
          all applicable foreign, federal, state, and local laws, statutes,
          licensing requirements, rules, and regulations, and judicial or
          administrative decisions applicable to the Business where the failure
          to so comply could have a material adverse effect on the results of
          operations or financial condition of SELLER, the Business or the
          Purchased Assets. SELLER has been granted all licenses, permits
          (temporary and otherwise), authorizations, and approvals from foreign,
          federal, state, and local government regulatory bodies necessary to
          carry on the

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              Business as currently conducted, all of which are currently valid
              and in full force and effect. All such licenses, permits,
              authorizations, and approvals shall be transferred to BUYER
              effective as of the Closing, and shall be valid and in full force
              and effect to the same extent as if SELLER were continuing
              operation of the Business. To the best of SELLER's knowledge,
              there is no order issued, investigation, or proceeding pending or
              threatened, or notice served with respect to any violation of any
              law, ordinance, order, writ, decree, rule, or regulation issued by
              any federal, state, local, or foreign court or governmental agency
              or instrumentality applicable to the Business.

     4.1.14   [Intentionally Omitted].

     4.1.15   Contracts and Commitments.
              ------------------------- 

              4.1.15.1  Set forth on Schedule 4.1.15.1 is a list of all
                        outstanding contracts, whether or not in writing, to
                        which SELLER is a party or to which any of the Purchased
                        Assets or DTS assets are subject that may: (i) involve
                        obligations (contingent or otherwise) of, or payments
                        to, SELLER in excess of $25,000; (ii) involve agreements
                        (written or unwritten) with suppliers and customers of
                        SELLER; (iii) involve the license of any proprietary
                        rights to or from SELLER; (iv) contain provisions
                        restricting and/or affecting the development,
                        manufacture, or distribution of the SELLER's products or
                        services; (v) relate to any aspect of the Business of
                        SELLER in which any other person who was or is an
                        officer, director, or employee of SELLER (or any person,
                        firm, partnership, trust, or corporation affiliated with
                        any such persons or any family members of such persons)
                        have a material interest; or (vi) involve agreements
                        (written or unwritten) on which the Business is
                        materially dependent.

              4.1.15.2  SELLER has performed all of its obligations under the
                        terms of each such contract, and is not in default
                        thereunder. No event or omission has occurred which but
                        for the giving of notice or lapse of time or both would
                        constitute a default by any party thereto under any such
                        contract, where such default by any party could have an
                        adverse impact on the results of operations or financial
                        condition or prospects of SELLER, the Business or the
                        Purchased Assets. Each such contract is valid and
                        binding on all parties thereto and in full force and
                        effect. SELLER has received no notice of default,
                        cancellation, or termination in connection with any such
                        contract.

                                       12

 
     4.1.16  Assets.  The Purchased Assets include all intellectual property,
             ------                                                          
             inventory and all other property in which SELLER has any right,
             title and interest. The Purchased Assets include all the assets
             necessary to operate the Business in the same manner as the
             Business was operated by SELLER prior to the Closing. The Purchased
             Assets are suitable for the purpose or purposes for which they are
             being used, are in good operating condition and in reasonable
             repair, and free from any known defects, except such minor defects
             as do not interfere with the continued use thereof. Each tangible
             Purchased Asset has been serviced and maintained in accordance with
             customary industry practices. Subject to normal wear and tear, such
             plants, facilities, machinery, and equip ment are capable of and
             are producing sound and merchantable products.

     4.1.17  [Intentionally Omitted].

     4.1.18  No Conflict or Default.  Neither the execution and delivery of this
             ----------------------                                             
             Agreement or the related agreements, nor compliance with the terms
             and provisions hereof and thereof, including without limitation,
             the consummation of the transactions contemplated hereby and
             thereby, will violate any statute, regulation, or ordinance of any
             governmental authority, or conflict with or result in the breach of
             any term, condition, or provision of the Articles of Incorporation
             or Bylaws of SELLER, as presently in effect, or of any agreement,
             deed, contract, mortgage, indenture, writ, order, decree, legal
             obligation, or instrument to which SELLER is a party or by which it
             or any of the Purchased Assets or assets of DTS are or may be
             bound, or constitute a default (or an event which, with the lapse
             of time or the giving of notice, or both, would constitute a
             default) thereunder.

     4.1.19  Labor Relations.
             --------------- 

             4.1.19.1  With respect to the Business, SELLER has complied with
                       Title VII of the Civil Rights Act of 1964, as amended,
                       the Fair Labor Standards Act, as amended, the
                       Occupational Safety and Health Act of 1970, as amended,
                       all applicable federal, state, and local laws, rules, and
                       regulations relating to employment, and all applicable
                       laws, rules and regulations governing payment of minimum
                       wages and overtime rates, and the withholding and payment
                       of taxes from compensation of employees.
  
             4.1.19.2  There are no labor controversies pending or threatened
                       between SELLER and any of its employees.

             4.1.19.3  SELLER has never entered into a collective bargaining
                       agreement or other labor union contract relating to the
                       Business and applicable to the employees.

                                       13

 
             4.1.19.4  There are no written employment or separation agreements,
                       or oral employment or separation agreements other than
                       those establishing an "at-will" employment relationship
                       between SELLER and any of the employees, except as set
                       forth in Schedule 4.1.19.4.

     4.1.20  Environmental Matters.  SELLER: (i) has obtained all applicable
             ---------------------                                          
             permits, licenses and other authorizations which are required under
             foreign, federal, state or local laws relating to pollution or
             protection of the environment, including laws relating to
             emissions, discharges, releases or threatened releases of
             pollutants, contaminants, or hazardous or toxic materials or wastes
             into ambient air, surface water, ground water, or land or otherwise
             relating to the manufacture, processing, distribution, use,
             treatment, storage, disposal, transport, or handling of pollutants,
             contaminants or hazardous or toxic materials or wastes by SELLER
             (or its agents); (ii) is in compliance with all terms and
             conditions of such required permits, licenses and authorization,
             and also is in compliance with all other limitations, restrictions,
             conditions, standards, prohibitions, requirements, obligations,
             schedules and timetables contained in such laws or contained in any
             regulation, code, plan, order, decree, judgement, notice or demand
             letter issued, entered, promulgated or approved thereunder; (iii)
             is not aware of nor has received notice of any event, condition,
             circumstance, activity, practice, incident, action or plan which is
             reasonably likely to interfere with or prevent continued compliance
             or which would give rise to any common law or statutory liability,
             or otherwise form the basis of any claim, action, suit or
             proceeding, based on or resulting from SELLER's (or any of its
             agents') manufacture, processing, distribution, use, treatment,
             storage, disposal, transport, or handling, or the emission,
             discharge, or release into the environment, of any pollutant,
             contaminant, or hazardous or toxic material waste; (iv) has taken
             all actions necessary under applicable requirements of Federal,
             state or local laws, rules or regulations to register any products
             or materials required to be registered by SELLER (or any of its
             agents) thereunder; and (v) is not aware of any contaminated soil
             or groundwater at any of the properties owned or operated, leased
             or previously owned or leased by SELLER. SELLER has disclosed to
             BUYER in writing (i) all permits relating to pollution or
             protection of the environment, including laws relating to
             emissions, discharges, releases or threatened releases of
             pollutants, contaminants, or hazardous or toxic materials or wastes
             into ambient air, surface water, ground water, or land or otherwise
             relating to the manufacture, processing, distribution, use,
             treatment, storage, disposal, transport, or handling of pollutants,
             contaminants or hazardous or toxic materials or wastes by SELLER
             (or its agents) its holds as of the date hereof, and (ii) all
             documents relating to tests previously conducted or to be conducted
             in the future for potential contamination at any of SELLER's
             facilities, whether owned or leased, including soil and water
             tests.

                                       14

 
4.1.21  Miscellaneous.
        ------------- 

        4.1.21.1  SELLER is (and following the Closing shall remain) solvent,
                  generally able to pay its debts as they become due and in a
                  position where SELLER has reasonably sufficient working
                  capital compared to SELLER's business plans, needs, and
                  expectations. In making this representation, SELLER
                  acknowledges that it is using such terms and financial
                  standards in every sense in which such terms and standards are
                  used in the Bankruptcy Code (Title 11 of the United States
                  Code) and in the Uniform Fraudulent Transfer Act and Uniform
                  Fraudulent Conveyance Act, as in effect in each applicable
                  jurisdiction.

        4.1.21.2  The consideration received by SELLER at the Closing is
                  reasonably equivalent to the value of the Purchased Assets and
                  the obligations of SELLER to BUYER in this Transaction. BUYER
                  has received no notice, knowledge or reason for inquiry from
                  SELLER (or, to the best of SELLER's knowledge and belief,
                  anyone else) of any information, fact, condition, event or
                  matter to contrary to such representations or otherwise
                  inconsistent with BUYER's good faith belief that BUYER is
                  paying in the ordinary and normal course of business a fair
                  and reasonable price for such Purchased Assets and
                  obligations.

Without limiting the generality of the foregoing, SELLER acknowledges that the
risk factors affecting the pricing of the Purchased Assets were independent of
SELLER's financial condition and circumstances, and BUYER did not unduly or
unfairly take advantage of SELLER's desire to sell the Purchased Assets. In all
respects, BUYER has conducted itself in good faith and consistent with
commercially reasonable standards for buyers in regularly conducted and
commercially reasonable sales.

        4.1.22  Proprietary Rights.
                ------------------ 

                4.1.22.1  SELLER owns all right, title and interest in and to or
                          is exclusively licensed or is otherwise entitled to
                          exercise, without restriction, all rights to all
                          patents, trademarks, trade names, service marks,
                          copyrights, mask works, trade secrets and other
                          intellectual property rights, and any applications or
                          registrations therefor, and all inventions, mask work
                          layouts, net lists, source code, object code,
                          schematics, technical drawings, technology, know-how,
                          processes, formulas, algorithms, computer software
                          programs, documentation, and all other tangible and
                          intangible information or material in any form, used
                          or currently proposed to be used in the Business or
                          which form part of the Purchased

                                       15

 
                          Assets, without any conflict with or infringement of
                          the rights of others and free and clear of any liens,
                          encumbrances or security interests (collectively, the
                          "Intellectual Property Rights") and has the right to
                          use, sell, license, assign, transfer, convey or
                          dispose thereof or the products, processes and
                          materials covered thereby.

                4.1.22.2  No person has asserted or threatened to assert any
                          claims with respect to the Intellectual Property
                          Rights (i) contesting the right of SELLER to use,
                          exercise, sell, license, transfer or dispose of any of
                          the Intellectual Property Rights or any products,
                          processes or materials covered thereby or (ii)
                          challenging the ownership, validity or enforceability
                          of any of the Intellectual Property Rights.

        4.1.23  Certain Payments. In connection with the Business, SELLER has
                ----------------
                not and no person directly or indirectly on behalf of it has
                made or received any payment that was not legal to make or
                receive.

        4.1.24  Books and Records. The books and records of SELLER to which
                -----------------
                BUYER and its accountants and attorneys have been given access
                are the true books and records of SELLER and truly and fairly
                reflect the underlying facts and transactions in all material
                respects.

        4.1.25  Complete Disclosure. The copies of all instruments, agreements,
                -------------------
                other documents and written information delivered by SELLER to
                BUYER or its accountants or counsel are and will be complete and
                correct in all material respects as of the date of delivery
                thereof. No representations or warranties made by SELLER in this
                Agreement, nor any document, written information, statement,
                financial statement, certificate or exhibit prepared and
                furnished or to be prepared and furnished by them or its
                representatives to BUYER pursuant hereto or the related
                agreements in connection with the transactions contemplated
                hereby or thereby, contains or will contain any untrue statement
                of a material fact, or omits or will omit to state a material
                fact necessary to make the statements or facts contained herein
                or therein not misleading.

        4.1.26  Customers and Suppliers. DTS is not aware nor has any reason to
                ------------------------
                believe that any of DTS' ten largest customers during the twelve
                months ended July 31, 1997 (determined on the basis of both
                revenues and bookings during such period) has terminated, or
                intends to materially reduce or terminate, the amount of its
                business with DTS, and DTS has no reason to believe that such
                termination or alteration would occur as a result of the
                consummation of the transactions contemplated by this Agreement
                or the related agreements.

                                       16

 
        4.1.27  Financial Statements. SELLER has furnished to BUYER a complete
                --------------------
                and accurate copy of its audited consolidated balance sheet as
                of December 31, 1994, December 31, 1995 and December 31, 1996
                and its audited consolidated statement of operations, cash flow
                and shareholders' equity for each of its fiscal years ended
                December 31, 1994, 1995, and 1996 (collectively, the "SELLER
                Audited Financial Statements"). The SELLER Audited Financial
                Statements have been prepared in accordance with generally
                accepted accounting principles ("GAAP") consistently applied and
                fairly present the consolidated financial position of SELLER as
                and at the dates thereof and SELLER's consolidated results of
                operations and cash flows for the periods then ended. The notes
                to the SELLER Audited Financial Statements as at and for each
                such period set forth in reasonable detail SELLER's accounting
                policies, principles and methods. SELLER has furnished to BUYER
                a complete and accurate copy of Alphatec USA, Inc.'s (including
                DTS) and DTS's on a stand alone basis, their respective
                unaudited balance sheet as of June 30, 1997 and their respective
                unaudited statement of operations, cash flow and shareholders'
                equity for the six months ended June 30, 1997 and has furnished
                to BUYER a balance sheet and statement of operations for
                Alphatec USA, Inc. (excluding DTS) as of July 31, 1997
                (collectively, the "SELLER Unaudited Financial Statements" and
                collectively with the SELLER Audited Financial Statements, the
                "SELLER Financial Statements"). The Company's revenue
                recognition policies comply with GAAP and no current or former
                customer has the right to return any products to the Company or
                has any right of set off or counterclaim against the Company.
                The SELLER Financial Statements have been prepared in accordance
                with GAAP consistently applied, except for the absence of
                footnotes, and fairly present the financial position of SELLER
                and each such entity individually and collectively as and at the
                dates thereof and SELLER's and each such entity's consolidated
                results of operations and cash flows for the periods then ended.

4.2  Of BUYER.  BUYER hereby represents and warrants to SELLER as follows and
     --------                                                                
     agrees with SELLER that the following representations and warranties shall
     be true and correct on the Closing Date:

     4.2.1  BUYER Organization.  At the Closing date BUYER will be duly
            ------------------                                         
            incorporated and will be validly existing as a corporation in good
            standing under the laws of the State of California, will have the
            corporate power to carry on its business as now conducted and will
            have full power and authority under such laws to execute, deliver
            and perform this Agreement.

     4.2.2  Corporate Authority. On or prior to the Closing Date, all corporate
            -------------------
            actions will have been taken by BUYER that are necessary to the due
            authorization or ratification of the execution and delivery of this
            Agreement and the performance of the BUYER hereunder. This Agreement
            constitutes the legal,

                                       17

 
            valid and binding obligation of BUYER, enforceable against BUYER in
            accordance with its terms, subject, as to the enforcement of
            remedies, to applicable bankruptcy, reorganization, insolvency,
            moratorium or other similar laws affecting the enforcement of
            creditors' rights generally from time to time in effect, and subject
            to any equitable principles limiting the right to obtain specific
            performance of certain obligations of BUYER hereunder. Except as
            required by BUYER's lenders, the entering into of this Agreement and
            the consummation of the transactions contemplated hereby do not and
            will not violate any law, regulation, rule, injunction or court
            order, or the provisions of BUYER'S Articles of Incorporation or By-
            Laws, or of any note, indenture, mortgage, lease license agreement
            or other agreement or instrument to which BUYER is a party or by
            which any of them is bound or of which any of them is maker.

     4.2.3  Consents.  Except for any filing that may be required under HSR or
            --------                                                          
            as required by BUYER'S lenders, no consent, approval, waiver,
            license, authorization or declaration of, or filing or registration
            with, any person, firm, corporation or other entity, including,
            without limitation, any lender, mortgagee, governmental authority,
            bureau or agency is required in connection with the execution,
            delivery and performance by BUYER of this Agreement or the
            consummation of the transaction contemplated hereby or thereby,
            except under the HSR Act.


                                   ARTICLE 5
                        CLOSING/PREPARATION FOR CLOSING
                        -------------------------------


5.1  Closing Date.  Subject to Article 6 hereof, the closing of the transactions
     ------------                                                               
     contemplated by this Agreement (the "Closing") shall be held at the offices
     of SELLER at the LEASED PREMISES at 11:00 a.m. on the Closing Date, or at
     such other time as may be mutually agreed to by the parties, unless the
     date for the Closing is extended by mutual agreement of the parties (the
     "Closing Date").

5.2  From the date of this Agreement until the Closing Date:

     5.2.1  BUYER'S Access to Premises and Information.  In order that BUYER may
            ------------------------------------------                          
            have full opportunity to make such investigation as it shall desire
            concerning the Business and the Purchased Assets, SELLER shall make
            available management personnel familiar with the conduct of the
            Business and the Purchased Assets and BUYER and its counsel,
            accountants and other representatives shall be afforded access
            during normal business hours to the properties, books, accounts,
            records, contracts and other documents of SELLER relating the
            Business and the Purchased Assets and the Assumed Obligations,
            wherever located and shall be permitted to make abstracts from and
            copies of

                                       18

 
            such books and records and documents. Prior to the Closing and if,
            for any reason the transactions contemplated by this Agreement are
            not consummated, thereafter until September 30, 2002, BUYER agrees
            that it will not disclose to any third person (other than its
            advisers or investors or lenders in respect of this transaction) or
            use for its own benefit any nonpublic confidential information
            relating to the Business that SELLER may have acquired during the
            course of its investigation and examination of the Business, whether
            acquired prior to or after the execution of this Agreement;
            provided, however, that nothing herein shall prohibit disclosure of
            --------  -------
            information (i) generally known to the public, or which becomes
            generally known to the public other than through a violation of this
            Agreement, (ii) in the possession of BUYER, or (iii) coming into the
            possession of BUYER will promptly return or destroy and cause its
            representatives to return or destroy any property, books, records or
            papers of SELLER and all abstracts and copies thereof which any of
            them may have in its possession. Because the breach or attempted or
            threatened breach of the obligations under this Section 5.2.1 will
            result in immediate and irreparable injury to SELLER for which
            SELLER will not have an adequate remedy at law, SELLER shall be
            entitled, in addition to all other remedies, to a decree of specific
            performance of this covenant and to a temporary and permanent
            injunction enjoining such breach, without posting bond or furnishing
            similar security.

     5.2.2  Conduct of Business in Ordinary Course.  SELLER shall cause the
            --------------------------------------                         
            Business to be operated in the ordinary course, consistent with past
            practice, except as may be consented to in writing by BUYER.

     5.2.3  Consents.  SELLER shall use its best efforts to obtain all consents
            --------                                                           
            of and authorizations by third parties and to make all filings with
            and give all notices to third parties that may be necessary or
            required in order to consummate the sale of the Purchased Assets,
            and shall take such additional actions as BUYER may request to
            cooperate so that the transactions contemplated by this Agreement
            may be expeditiously consummated.

     5.2.4  Other Discussions.  From the date hereof until the Closing, SELLER
            -----------------                                                 
            shall not, nor shall any of its representatives or affiliates on its
            behalf, discuss, communicate or negotiate with any other party,
            concerning the possible disposition of the Business or the Purchased
            Assets or the assets of DTS or of SELLER. If SELLER or any such
            representatives receives any inquiries from another party relating
            to any proposed disposition of the Business or the Purchased Assets
            following the date hereof, SELLER shall promptly (a) advise such
            party that SELLER is not entitled to enter into any such discussions
            or negotiations and (b) notify BUYER in writing of such inquiry.
            SELLER understands that BUYER is relying on this covenant in
            entering into this

                                       19

 
            Agreement and that BUYER is expending significant funds in order to
            purchase the Purchased Assets.

     5.2.5  Bulk Transfer Laws.  SELLER shall comply with the California Uniform
            ------------------                                                  
            Commercial Code - Bulk Transfers and any other applicable state bulk
            transfer laws (collectively, the "Bulk Sales Provisions"), if
            required, prior to the Closing and shall provide BUYER with written
            documentation of such compliance. If SELLER cannot timely comply
            with such bulk sales laws requirements BUYER hereby agrees to waive
            compliance with such laws and SELLER agrees to indemnify and hold
            BUYER's Indemnitees (as defined) harmless which they may suffer or
            incur by virtue of such non-compliance. Such indemnification shall
            survive the Closing and shall not be subject to the limitations on
            the amount of indemnification or duration provided in Article 8
            hereof.

     5.2.6  Purchase or Retirement of Bank Debt.  Prior to Closing, the BUYER
            -----------------------------------                              
            shall have the right, in its sole discretion, to purchase or retire
            up to all of the debt of SELLER owed to Silicon Valley Bank,
            Comerica/California and Comerica/International. Any and all amounts
            so purchased or retired by BUYER reduce the Purchase Price on a
            dollar-for-dollar basis. SELLER agrees to cooperate and enter into
            any agreements necessary to give effect to the foregoing covenant.

     5.2.7  Exhibits and Schedules to Agreement.  BUYER and SELLER shall each
            -----------------------------------                              
            deliver to the other their respective Exhibits and Schedules
            contemplated by this Agreement within eight days after executing
            this Agreement. SELLER's Exhibits and Schedules must be in a form
            reasonably satisfactory to BUYER, or BUYER shall have the right to
            terminate this Agreement without liability or obligation.


                                   ARTICLE 6
                             CONDITIONS TO CLOSING
                             ---------------------


6.1  BUYER.  The obligations of BUYER to close shall be subject to the
     -----                                                            
     satisfaction, or the waiver in writing by BUYER, on or prior to the Closing
     Date, of all of the following conditions:

     6.1.1  Deed.  BUYER shall have received the Deed, executed by SELLER.
            ----                                                          

     6.1.2  Bill of Sale.  BUYER shall have received the Bill of Sale, executed
            ------------                                                       
            by SELLER.

                                       20

 
     6.1.3  Assignment and Assumption.  BUYER shall have received the Assignment
            -------------------------                                           
            and Assumption Agreement, executed by SELLER.

     6.1.4  Representations and Warranties.  The representations and warranties
            ------------------------------                                     
            of SELLER contained in this Agreement shall be correct in all
            respects on and as of the Closing Date with the same force and
            effect as though such representations and warranties were made at
            the Closing; and each and all of the covenants to be performed by
            SELLER on or before the Closing Date pursuant to the terms hereof
            shall have been duly performed.

     6.1.5  No Liens.  The Purchase Assets, the assets of DTS and the Business
            --------                                                          
            shall be delivered to BUYER free and clear of all material liens,
            encumbrances, claims and the like.

     6.1.6  Performance of Agreement.  All covenants, conditions, and other
            ------------------------                                       
            obligations under this Agreement and the related agreements which
            are to be performed or complied with by the SELLER, including Board
            of Directors and stockholder approval, shall have been fully
            performed and complied with at or prior to the Closing.

     6.1.7  No Material Adverse Change.  There shall have been no material
            --------------------------                                    
            adverse change in the financial condition, business, or properties
            of SELLER which materially and adversely affects the conduct of the
            Business as presently being conducted or the financial condition,
            business, or properties of SELLER since June 30, 1997.

     6.1.8  Absence of Governmental or Other Objection.  There shall be no
            ------------------------------------------                    
            pending or threatened lawsuit challenging the transaction by any
            body or agency of the federal, state, or local government or by any
            third party, and the consummation of the transaction shall not have
            been enjoined by a court of competent jurisdiction as of the Closing
            and any applicable waiting period under any applicable federal law
            shall have expired.

     6.1.9  Evidence of Title.  BUYER shall have received evidence, at or prior
            -----------------                                                  
            to the Closing, satisfactory to it of SELLER's title to all of the
            Purchased Assets and right to fully convey all Purchased Assets free
            and clear of any lien, encumbrances or restrictions on transfer.

     6.1.10 HSR Act.  Any waiting period (and any extension thereof) applicable
            -------                                                            
            to the consummation of the sale of Purchased Assets under HSR shall
            have expired or been earlier terminated.

                                       21

 
     6.1.11  FIRPTA.  BUYER shall have received a properly executed Foreign
             ------                                                        
             Investment and Real Property Tax Act of 1980 ("FIRPTA")
             Notification Letter, in form and substance satisfactory to BUYER.

     6.1.12  Assets.  On the date of Closing, SELLER shall have at least
             ------                                                     
             $5,000,000 of fully and readily collectible accounts receivable and
             cash and cash equivalents on hand and shall provide to BUYER a
             Closing Date balance sheet indicating such amount.

     6.1.13  Evidence of Debt Extinguishment.  BUYER shall have received
             -------------------------------                            
             satisfactory written evidence that all intercompany accounts
             between SELLER and parent and SELLER and Alphatec Electronics
             Corporation have been properly eliminated and that any net
             intercompany receivables owing to Alphatec and DTS by their
             corporate parent or affiliate shall be properly recorded.

     6.1.14  BUYER Board Approval.  The Board of Directors of BUYER shall have
             --------------------                                             
             approved the transactions contemplated by this Agreement.

     6.1.15  Environmental Reports.  BUYER shall have received environmental
             ---------------------                                          
             reports prepared by a firm reasonably acceptable to BUYER, such
             reports to be in form and substance acceptable to BUYER. The costs
             and expenses of such reports and the associated investigation and
             testing shall be borne by SELLER.

     6.1.16  Employment Agreements.  Each of Sassan Raissi, Mike Sarvian, Tom
             ---------------------                                           
             Knecht and Del Gilliam shall have executed and delivered new
             employment and non-competition agreements with DTS (each an
             "Employment Agreement"). The terms of each Employment Agreement
             shall provide, among other things, that (i) such agreement
             supersedes and replaces all prior agreements between such employee
             and DTS with respect to employment and compensation matters and
             (ii) such employee releases and discharges DTS and ISE with respect
             to any claims with respect to compensation, including, without
             limitation, salary, bonuses, profit sharing and vacation accruals.


6.2  SELLER.  The obligations of SELLER to be performed at the Closing shall be
     ------                                                                    
     subject to the satisfaction, or the waiver in writing by SELLER, on or
     prior to the Closing Date of all of the following conditions:

     6.2.1  Payment.  SELLER shall have received payment of the Purchase Price
            -------                                                           
            specified in Section 3.1.

     6.2.2  Assignment and Assumption.  SELLER shall have received the
            -------------------------                                 
            Assignment and Assumption Agreement, executed by BUYER.

                                       22

 
     6.2.3  Representations and Warranties.  The representations and warranties
            ------------------------------                                     
            of BUYER contained in this Agreement shall be correct in all
            material respects on and as of the Closing Date with the same force
            and effect as though such representations and warranties were made
            at the Closing Date, and each and all of the covenants to be
            performed by BUYER on or before the Closing Date pursuant to the
            terms hereof shall have been duly performed.


                                   ARTICLE 7
                                   COVENANTS


7.1  Additional Documentation.  At any time and from time to time after the
     ------------------------                                              
     Closing Date, at BUYER's reasonable request and without further monetary
     consideration, SELLER will execute and deliver such other instruments of
     conveyance and transfer as BUYER reasonably may require more effectively to
     convey to, transfer to, and vest in BUYER, or to put BUYER in possession
     of, any or all of the assets and properties intended to be transferred,
     conveyed or assigned to BUYER pursuant to the provisions of this Agreement.

7.2  Assumption of Obligations.  To the extent that any of the commitments,
     -------------------------                                             
     leases, purchase orders and contracts of the Business are not assignable
     without the consent of another party and are "Assumed Liabilities," SELLER
     and BUYER each agree to use reasonable efforts to obtain such consent to
     the assignment hereof to BUYER.  If such consent shall not be obtained for
     any such commitments, leases, purchase orders or contracts, SELLER and
     BUYER shall make suitable arrangements, without cost to SELLER, whereby
     BUYER may nevertheless enjoy the benefits and rights of SELLER, and perform
     the obligations of SELLER, thereunder.


                                   ARTICLE 8
                                INDEMNIFICATION
                                ---------------


8.1  SELLER'S Indemnification.
     ------------------------ 

     8.1.1  SELLER agrees to indemnify and hold harmless BUYER, its affiliates
            and its officers, directors, employees and agents, successors and
            assigns (each a BUYER's Indemnitee" and collectively the "BUYER's
            Indemnitees") from any and all damages (including punitive damages),
            loses, expenses (including, without limitation, court costs,
            arbitration fees and attorneys' fees and expenses of investigation
            and all payments made pursuant to any agreement or legal requirement
            to indemnify, hold harmless or exonerate any person), claims
            (including amounts paid in settlement), demands, suits, causes of
            action,

                                       23

 
           proceedings, judgments, fines, penalties and other liabilities or
           obligations of any nature (including costs relating to the
           enforcement of this Article 8, contingent or non-contingent,
           liquidated or unliquidated, direct or indirect) (collectively,
           "Losses"), incurred or sustained by or asserted against any of the
           BUYER's Indemnitees with respect to or arising out of: (i) the
           failure or breach of any of the SELLER's representations and
           warranties made in Section 4.1 hereof to be true and correct in all
           respects as of the Closing Date; (ii) the SELLER's failure or refusal
           or inability to pay for all liabilities and obligations of SELLER,
           other than the Assumed Liabilities that BUYER has agreed to assume
           pursuant to Section 2.4 of this Agreement; and (iii) the breach of or
           failure by SELLER to observe or perform any obligation, covenant or
           agreement of SELLER under this Agreement; provided, however, that no
                                                     --------  -------
           BUYER's Indemnitee shall be entitled to indemnification for Losses
           under the provisions of this Section 8.1 unless and until the
           aggregate amount of all Losses of the BUYER's Indemnitees as a group
           under Section 8.1 shall have exceeded $100,000 in the aggregate, in
           which event the BUYER's Indemnitees in the aggregate shall be
           entitled to such indemnification only for all Losses in excess of
           such amount. The indemnification obligations of SELLER for a breach
           of its representations and warranties under this Section 8.1 shall
           survive the Closing for a period of three (3) years after the
           Closing.

    8.1.2  Notwithstanding any investigation conducted at any time with regard
           thereto by or on behalf of any party to this Agreement, all
           representations, warranties, obligations, covenants, and agreements
           of SELLER shall survive the execution, delivery, and performance of
           this Agreement, unless otherwise specifically set forth in this
           Agreement to the contrary. No investigation made by or on behalf of
           BUYER with respect to SELLER shall be deemed to affect BUYER's
           reliance on the representations, warranties, covenants and agreements
           made by SELLER contained in this Agreement and shall not be a waiver
           of BUYER's rights to indemnity as herein provided for the breach or
           inaccuracy of or failure to perform or comply with any of SELLER's
           representations, warranties, covenants or agreements under this
           Agreement. All representations and warranties of each party set forth
           in this Agreement shall be deemed to have been made again by such
           party at and as of the Closing. Nothing in this Agreement shall be
           construed as limiting in any way the remedies that may be available
           to a party in the event of fraud relating to the representations,
           warranties, agreements or covenants made by any other party in this
           Agreement. SELLER shall have liabilities and obligations for Losses
           with respect to claims submitted or notice of claims provided during
           the time period of survivability of the specific representation,
           warranty, covenant or agreement as set forth herein. Notwithstanding
           the expiration date of the representations, warranties, covenants and
           agreements set forth herein, if BUYER shall notify SELLER with
           respect to the submission of a claim during the time period of
           survivability of such representation, warranty, covenant or
           agreement,

                                       24

 
           SELLER's liability or obligation for Losses shall continue in full
           force and effect until settled to the other party's satisfaction with
           respect to those claims timely made.

8.2  BUYER's Indemnification.  BUYER agrees to indemnify and hold harmless
     -----------------------                                              
     SELLER, its affiliates and its officers, directors, employees and agents,
     successors and assigns (each a SELLER's "Indemnitee" and collectively,
     "SELLER's Indemnitees") from all Losses incurred or sustained by or
     asserted against any of SELLER's Indemnitees with respect to or arising out
     of: (i) the failure of the BUYER's representations to be true and correct
     in all material respects as of the Closing Date, provided, however, that
                                                      --------  -------      
     SELLER's Indemnitees shall be entitled to indemnification for Losses under
     this Section 8.2: (i) only if and when, and to the extent that, such Losses
     exceed $100,000 in the aggregate, in which event the BUYER's indemnitees in
     the aggregate shall be entitled to such indemnification only for all Losses
     in excess of such amount; (ii) the Assumed Liabilities; and (iii) the
     breach of or failure to observe or perform any obligation of BUYER required
     under this Agreement and the agreements contemplated hereby.  The
     indemnification obligations of BUYER pursuant to this Section 8.2 shall
     survive the Closing as follows:  With respect to clause (i), for three
     years thereafter, and with respect to clauses (ii) and (iii), until such
     time as the applicable statute of limitation has expired.

8.3  Notice and Defense.  Any party or parties seeking indemnification under
     ------------------                                                     
     this Article 8 (collectively, the "Indemnitee") shall, on each occasion
     that indemnification is sought, give prompt written notice within the
     prescribed survival period for such indemnification, of any claim, suit or
     demand that the Indemnitee believes will or may give rise to
     indemnification hereunder to BUYER, on behalf of all BUYER's Indemnitees,
     on the one hand, or to SELLER, on behalf of all SELLER's Indemnitees, on
     the other hand (the person to whom such notice of claim is given being
     referred to herein as the "Indemnitor").  Except as hereinafter provided,
     the Indemnitor shall be obligated to defend and to direct the defense
     against such claim, suit or demand, in its name or in the name of the
     Indemnitee at the Indemnitor's expense and with counsel of the Indemnitor's
     own choosing and, so long as the Indemnitor is conducting such defense, the
     Indemnitee shall not without the Indemnitor's written consent settle or
     compromise or by affirmative action extend the statue of limitations with
     respect to, and the Indemnitor shall have the right to settle or
     compromise, any such claim, suit or demand; provided, however, that the
                                                 --------  -------          
     Indemnitor shall not, without the Indemnitee's written consent, settle or
     compromise any claim or consent to any entry of judgment that does not
     include as an unconditional term thereof the giving by the claimant or the
     plaintiff to the Indemnitee of a release from all liability in respect of
     such claim, in form and substance reasonably satisfactory to the
     Indemnitee.  The Indemnitee shall, at the Indemnitor's expense, cooperate
     in the defense of any such claim, suit or demand.  If the Indemnitor,
     within a reasonable time after notice of a claim, fails to defend the
     Indemnitee, the Indemnitee shall be entitled to undertake the defense of,
     and to compromise or settle such claim at the expense of and for the
     account and risk of the

                                       25

 
     Indemnitor, utilizing counsel of the Indemnitee's own choosing.  No right
     or remedy conferred in this Article 8 is intended to be exclusive of any
     right or remedy available, now or hereafter, at law or in equity or
     otherwise, to the parties hereto.


                                   ARTICLE 9
                                 MISCELLANEOUS
                                 -------------


9.1  Cost.  All costs and expenses, including attorneys' fees, incident to this
     ----                                                                      
     Agreement and the transactions contemplated herein shall be paid by the
     party who incurred the same, whether or not the transactions contemplated
     herein or therein are consummated.  The parties hereto respectively
     represent and warrant that they have not dealt in any manner with a broker,
     agent or finder as regards the transaction set forth in this Agreement,
     except the BUYER has retained two agents.

9.2  No Third-Party Benefit.  The agreements contained herein are solely for the
     ----------------------                                                     
     benefit of the parties hereto.  No party, including employees, other than
     such corporations and natural person and their respective permitted
     assigns, shall be entitled to reply on this Agreement for any purpose.

9.3  Headings.  The titles of the Articles and sections of this Agreement are
     --------                                                                
     for convenience of reference only and are not to be considered in
     construing this Agreement.

9.4  Entire Agreement.  This Agreement and any documents specifically referred
     ----------------                                                         
     to herein constitute the entire understanding between the parties with
     respect to the subject matter hereof, superseding all negotiations, prior
     discussions and preliminary agreements.

9.5  Modification/Waiver.  SELLER and BUYER may by subsequent written agreement,
     -------------------                                                        
     with each party acting at its sole and absolute discretion: (i) extend the
     time for the performance of any of the obligations or other acts of the
     parties here; (ii) waive any inaccuracies in the representations contained
     in this Agreement; (iii) waive compliance with or modify any of the
     covenants contained in this Agreement; (iv) waive or modify performance of
     any of the obligations of any of the parties hereto; and (v) otherwise
     amend this Agreement.  Any agreement on the part of the party for any such
     extension, modification, waiver or amendment shall be validly and
     sufficiently authorized for the purpose of this Agreement if authorized by
     proper officers of such party.

9.6  Representations/Warranties.  There are no representations, warranties or
     --------------------------                                              
     obligations of any kind made in connection with the transactions
     contemplated hereby other than those expressed in this Agreement.  It is
     expressly understood and agreed that BUYER

                                       26

 
     and SELLER, and their respective affiliates, officers and/or agents, have
     not made any warranty or agreement, express or implied, except as are
     herein expressly incorporated, as to the tax consequences of this
     transaction or the tax consequences of any transaction pursuant to or
     arising out of this Agreement.

9.7  Assignment.  No party hereto may assign its rights or delegate its
     ----------                                                        
     responsibilities under this Agreement without the prior written consent of
     the other party hereto.  The terms of this Agreement shall, however, be
     binding and legally enforceable against all successors and assigns, by law
     or otherwise, including upon dissolution or merger.

9.8  Remedies of BUYER.  SELLER agree that the Purchased Assets are unique and
     -----------------                                                        
     not otherwise readily available to BUYER.  Accordingly, SELLER acknowledges
     that, in addition to all other remedies to which BUYER is entitled, BUYER
     shall have the right to enforce the terms of this Agreement by a decree of
     specific performance.

9.9  Notices.  All notices, requests, demands and other communications hereunder
     -------                                                                    
     shall be in writing and shall be deemed to have been duly given when
     delivered in person to the respective address listed below, or when faxed
     to the respective address listed below, or two (2) business days after
     mailed by certified mail, postage prepaid, return receipt requested to the
     address listed below:

     If to BUYER:

                    ISE LABS, INC.
                    2095 Ringwood Avenue
                    San Jose, CA  95131

     with a copy to BUYER's counsel:

                    Warren Lazarow, Esq.
                    Brobeck, Phleger & Harrison LLP
                    2200 Geng Road
                    Palo Alto, CA  94403

     If to SELLER:

                    ALPHATEC USA, INC.
                    3600 Peterson Way
                    Santa Clara, CA 95054
                    Fax:  (408) 567-1111
                    Attention:  President

9.10  Attorneys' Fees.  If any action at law or in equity is necessary to
      ---------------                                                    
     enforce or interpret the terms of this Agreement or to protect the rights
     obtained hereunder the prevailing

                                       27

 
      party shall be entitled to its reasonable attorneys' fees, costs, and
      disbursements in addition to any other relief to which it may be entitled.

9.11  Cooperation and Records Retention. SELLER and BUYER shall (i) each provide
      ---------------------------------                                         
      the other with such assistance as may reasonably be requested by them in
      connection with the preparation of any Tax return, statement, report, form
      or other document (hereinafter collectively a "Tax Return"), or in
      connection with any audit or other examination by any taxing authority or
      any judicial or administrative proceedings relating to liability for
      Taxes, (ii) each retain and provide the other, with any records or other
      information which may be relevant to any such Tax Return, audit or
      examination, proceeding or determination, and (iii) each provide the other
      with any final determination of any such audit or examination, proceeding
      or determination that affects any amount required to be shown on any Tax
      Return of the other for any period. Without limiting the generality of the
      foregoing, SELLER and BUYER shall retain, until the applicable statute of
      limitations (including any extensions) have expired, copies of all Tax
      Returns, supporting work schedules and other records or information which
      may be relevant to such Tax Returns for all tax periods or portions
      thereof ending before or including the Closing and shall not destroy or
      otherwise dispose of any such records without first providing the other
      party with a reasonable opportunity to review and copy the same. BUYER
      shall keep the original copies of the records at its facilities in
      California and elsewhere, if applicable, and, at SELLER's expense, shall
      provide copies of the Records to SELLER upon SELLER's request. SELLER
      shall provide BUYER with access to all of SELLER's books and records if
      BUYER requests them from time to time.

9.12  Section 338(h)(10) Election.
      --------------------------- 

      9.12.1  SELLER shall, at the request of BUYER, join with BUYER in making a
              timely election under Section 338(h)(10) of the Code and any
              corresponding elections under state and local tax laws
              (collectively, the "Election") with respect to the acquisition of
              the DTS shares. BUYER and SELLER shall cooperate with each other
              to take all actions necessary and appropriate (including filing
              such forms, returns, elections, schedules and other documents as
              may be required) to effect and preserve a timely Election in
              accordance with Section 338(h)(10) of the Code or any successor
              provisions (and all corresponding state and local tax laws). BUYER
              and SELLER shall report the acquisition of the DTS shares pursuant
              to this Agreement consistent with the Election.

      9.12.2  In connection with the Election, within 90 days after Closing,
              BUYER shall provide to SELLER a schedule which sets forth the
              proposed allocation of the Purchase Price (and any deemed
              assumption of liabilities for Tax purposes) among the assets of
              DTS (the "Allocation Schedule"). Such allocations shall be made in
              accordance with Section 338(h)(10) of the Code and any applicable
              Treasury Regulations. The parties shall report the deemed sale of
              assets of

                                       28

 
              DTS pursuant to the Election in a manner consistent with the
              Allocation Schedule.

9.13  Governing Law.  This Agreement shall be governed by and construed in
      -------------                                                       
      accordance with the laws of the State of California. The parties hereto
      consent and agree that the state and federal courts located within the
      State of California shall have exclusive jurisdiction over any dispute
      arising hereunder.

9.14  Equipment at Closing.  SELLER shall furnish an equipment list to BUYER by
      --------------------                                                     
      September 1, 1997. In the event that the equipment supplied at Closing is
      less than that set forth on the final equipment list at Closing, then
      BUYER shall be repaid the amount of the net book value of the equipment
      not supplied.

9.15  Purchase Price Escrow.  At BUYER's option, the purchase price may be held
      ---------------------                                                    
      in escrow with instructions to the escrow agent to discharge in order, the
      following indebtedness, liability or obligations of Alphatec USA or DTS:
      (i) to the extent not purchased or retired by BUYER pursuant to Section
      5.2.6, all debts of SELLER owed to Silicon Valley Bank,
      Comercia/California and Comerica/International, (ii) all accounts 
      payable--trade (excluding any accounts payable to affiliates) of DTS as of
      the Closing Date for the transaction, (iii) all accounts payable--trade
      (excluding any accounts payable to affiliates), short term capital lease,
      short term equipment loan, long term capital lease and long term equipment
      loan (excluding long term loan from affiliated entities), of Alphatec USA
      as of the Closing Date for the transaction, as reflected on the audited
      non-consolidated balance sheet of Alphatec USA as of such date, and (iv)
      all amounts due and owing to DTS employees under their profit sharing
      agreements as of the Closing Date for the proposed transaction.

9.16  Employee Benefits.  Prior to Closing, SELLER shall pay all accrued
      -----------------                                                 
      salaries and bonuses (including profit sharing) and accrued vacation
      amounts owed to all service providers of SELLER (including DTS).

                                       29

 
      IN WITNESS WHEREOF, the parties hereto have caused their respective names
to be hereunto subscribed as of the date and year first above written.
 
                                       ISE LABS, INC.               
                                                                    
                                                                    
                                       By:    /s/ Saeed Malik
                                             ----------------------------- 
                                       Name:  Saeed Malik                       
                                             ----------------------------- 
                                       Title: President                       
                                             ----------------------------- 
                                                                    
                                                                    
                                       ALPHATEC USA, INC.           
                                       for itself and on behalf of  
                                       Digital Testing Services, Inc.
                                                                    
                                                                    
                                       By:    /s/ William H. Dana
                                             ----------------------------- 
                                       Name:  William H. Dana
                                             ----------------------------- 
                                       Title: Vice President
                                             ----------------------------- 

                                       By:    /s/ R G Grammer  
                                             ----------------------------- 
                                       Name:  R G Grammer
                                             ----------------------------- 
                                       Title: President
                                             ----------------------------- 

 
                                  Exhibit 2.1

          The Registrant agrees to furnish supplementally a copy of any omitted 
Exhibits, Attachment and Schedules to the Commission upon request.