FIRST AMENDMENT TO OPTION AND
                          AGREEMENT AND PLAN OF MERGER

     This  First  Amendment  to Option  and  Agreement  and Plan of Merger  (the
"Amendment")  is entered  into as of August 29,  2002 by and among (i)  National
Semiconductor  Corporation,  a Delaware  corporation  ("National"),  (ii) Nintai
Acquisition Sub, Inc., a California corporation and a wholly-owned subsidiary of
National  ("Merger Sub"),  (iii)  DigitalQuake,  Inc., a California  corporation
("DigitalQuake"), and (iv) Paul A. Lessard and Michael G. Fung (the "Founders").
National,  Merger Sub,  DigitalQuake and the Founders are sometimes  hereinafter
referred to as the "Parties."

     WHEREAS,  the  Parties  entered  into an Option and  Agreement  and Plan of
Merger dated as of February 8, 2002 (the "Agreement"); and

     WHEREAS,  the  Parties  now  wish to  amend  the  Agreement  in the  manner
described in this Amendment; and

     WHEREAS, the board of directors of DigitalQuake has approved this Amendment
by resolutions adopted at a special meeting held on August __, 2002; and

     WHEREAS,  concurrently  with  the  execution  of this  Amendment  and as an
inducement  to  National  to enter  into  this  Amendment,  the  holders  of all
outstanding shares of DigitalQuake capital stock have approved the Agreement, as
amended  by this  Amendment,  and the Merger (as  defined in the  Agreement)  by
unanimous written consent; and

     WHEREAS,  concurrently  with  the  execution  of this  Amendment  and as an
inducement  to  DigitalQuake  and the  Founders  to enter  into this  Amendment,
National has  delivered a Merger  Option  Notice (as defined in the  Agreement),
which specifies an anticipated Closing Date of August 29, 2002; and

     WHEREAS, the Parties believe this Amendment will benefit each of them.

     NOW, THEREFORE,  for good and valuable  consideration,  receipt of which is
hereby acknowledged, the Parties hereto agree as follows:

          1.   The  definition of "Closing Date" in Section 1.1 of the Agreement
               shall be revised to state in its entirety as follows:

          ""Closing  Date"  means the date  specified  by National in the Merger
     Option Notice, subject to the terms and conditions of this Agreement."

          2.   The  definition of "Excess  Transaction  Costs" in Section 1.1 of
               the  Agreement  shall be  revised  to state  in its  entirety  as
               follows:


          "Excess  Transaction  Costs"  means (i) any fees and expenses of legal
     counsel, accountants and any other advisors,  representatives,  consultants
     or finders  incurred by  DigitalQuake  in excess of $120,000 in  connection
     with  the  negotiation,  preparation,  execution  and  performance  of this
     Agreement,  the Series B Purchase Agreement, the Technology Development and
     Licensing  Agreement and the transactions  contemplated hereby and thereby,
     excluding any fees or expenses  payable to Toan Tran,  and (ii) all amounts
     greater  than  $300,000  payable  to  Toan  Tran  in  connection  with  the
     negotiation,  preparation, execution and performance of this Agreement, the
     Series B Purchase  Agreement,  the  Technology  Development  and  Licensing
     Agreement and the transactions contemplated hereby and thereby."

          3.   The  definition of "Financial  Statements"  in Section 1.1 of the
               Agreement shall be revised to state in its entirety as follows:

          ""Financial Statements" means the unaudited balance sheets and related
     statements of income,  cash flow and shareholders'  equity for DigitalQuake
     as of and for the years ended December 31, 2001 and 2000, and as of and for
     the six  months  ended  June 30,  2002 and  2001,  together  with any notes
     thereon, all of which are attached as Schedule 1.1(c)."

          4.   The  following  definition  shall be added to Section  1.1 of the
               Agreement:

          ""Restricted   DigitalQuake   Common   Stock"  shall  mean  shares  of
     DigitalQuake  Common Stock issued upon  exercise of a  DigitalQuake  Option
     that  are not  Vested  Shares  (within  the  meaning  of the  terms  of the
     applicable  DigitalQuake  Option) and that do not become  Vested  Shares by
     virtue of any  acceleration  of vesting  triggered  by the Merger under the
     terms of the applicable DigitalQuake Option."

          5.   Section  2.4 of the  Agreement  shall be  revised to state in its
               entirety as follows:

          "2.4 Actions Following Exercise of the Option.  Immediately  following
     National's  exercise  of the  Merger  Option,  each of the  parties to this
     Agreement  shall take all actions  necessary or desirable to consummate the
     Merger by the date specified by National in the Merger Option Notice."

          6.   Section 3.2  of the  Agreement  shall be  revised to state in its
               entirety as follows:

          "3.2  Conversion  of  DigitalQuake   Common  Stock  and   DigitalQuake
     Preferred  Stock.

               (a)  At the Effective Time,  each share of DigitalQuake  Series A
                    Preferred Stock issued and outstanding  immediately prior to
                    the  Effective  Time  shall,  by  virtue of the  Merger  and
                    without  any  action on the part of the holder  thereof,  be
                    canceled and  extinguished  and converted  into the right to
                    receive in cash, without interest, $1.00.

               (b)  At the Effective Time,  each share of DigitalQuake  Series B
                    Preferred Stock issued and outstanding  immediately prior to
                    the Effective Time (other than shares of DigitalQuake Series
                    B  Preferred  Stock  held by  National  or its  Subsidiaries
                    (which shall be canceled pursuant to Section 3.7)) shall, by
                    virtue of the Merger and  without  any action on the part of
                    the  holder  thereof,   be  canceled  and  extinguished  and
                    converted  into  the  right  to  receive  in  cash,  without
                    interest, $1.78.


               (c)  At the Effective  Time,  each share of  DigitalQuake  Common
                    Stock,  including shares of Restricted  DigitalQuake  Common
                    Stock,  issued  and  outstanding  immediately  prior  to the
                    Effective  Time (other than  shares of  DigitalQuake  Common
                    Stock held by National or its  Subsidiaries  (which shall be
                    canceled  pursuant to Section 3.7) and other than Dissenting
                    Shares (as defined  herein))  shall, by virtue of the Merger
                    and without any action on the part of the holder thereof, be
                    canceled and  extinguished  and converted  into the right to
                    receive in cash, without interest:

                    (i)  immediately  following  the  Effective  Time, an amount
                         equal to the quotient of (A) the Adjusted Consideration
                         (as  defined  below)  divided by (B) the sum of (x) the
                         total  number of shares of  DigitalQuake  Common  Stock
                         outstanding   three  days  before  the   Closing   Date
                         (including    shares   held   by   National   and   its
                         Subsidiaries)  plus (y) the  total  number of shares of
                         DigitalQuake  Common Stock issuable upon  conversion of
                         shares  of  DigitalQuake   Preferred  Stock  (including
                         shares   held  by   National   and  its   Subsidiaries)
                         outstanding three days before the Closing Date plus (z)
                         the total number of shares of DigitalQuake Common Stock
                         subject  to  DigitalQuake  Options,  warrants  or other
                         convertible   securities   (including   those  held  by
                         National and its  Subsidiaries)  outstanding three days
                         before the Closing Date (such amount, the "Adjusted Per
                         Share Price");  provided,  however, that ten percent of
                         the  Adjusted  Per Share Price  shall be  withheld  and
                         deposited  into escrow  pursuant to Section 3.4 hereof.
                         The amount of the Adjusted Per Share Price withheld and
                         deposited into escrow from all holders of  DigitalQuake
                         Common Stock and  DigitalQuake  Preferred  Stock (other
                         than National) and deposited into escrow, together with
                         the amounts  withheld  from the  Optionees  pursuant to
                         clause  (y)(I) of Section  3.4(a) and clause  (y)(I) of
                         Section 3.4(b), is referred to herein as the "Indemnity
                         Escrow  Amount."  For purposes of this  Agreement,  the
                         "Adjusted  Consideration"  means  an  amount  equal  to
                         Twenty   Million   Six   Hundred    Thousand    Dollars
                         ($20,600,000)  reduced by the Excess Transaction Costs,
                         if any;

                    (ii) on the date that is thirty (30) days after the issuance
                         by National of a statement of operations as part of its
                         standard  quarterly  earnings  press  release  for  the
                         quarterly  period  ending  August 24,  2003,  an amount
                         equal to 94% of (A) the amount  specified  in the table
                         below under the  heading  "Aggregate  Earn-Out  Amount"
                         corresponding  to the  aggregate  amount of Revenue (as
                         defined   below)   recognized   by  National  from  the
                         Effective  Time  through  August 24, 2003 from sales of
                         products incorporating DQ Technology (as defined below)
                         set forth in the table below under the heading "Revenue
                         Amount"  divided by (B) the sum of (x) the total number

                         of  shares of  DigitalQuake  Common  Stock  outstanding
                         three days before the  Closing  Date (other than shares
                         held by  National  and its  Subsidiaries)  plus (y) the
                         total  number of shares of  DigitalQuake  Common  Stock
                         issuable  upon  conversion  of shares  of  DigitalQuake
                         Preferred Stock (other than shares held by National and
                         its  Subsidiaries)  outstanding  three days  before the
                         Closing  Date  plus (z) the  total  number of shares of
                         DigitalQuake   Common  Stock  subject  to  DigitalQuake
                         Options,   warrants  or  other  convertible  securities
                         (other   than   those   held   by   National   and  its
                         Subsidiaries) outstanding three days before the Closing
                         Date; and


              Revenue Amount                    Aggregate Earn-Out Amount
              --------------                    -------------------------

        Greater than $14,000,000                     $   1,400,000

        $7,000,000 to $14,000,000                    $     500,000

          Less than $7,000,000                       $           0


                    (iii)on  the  date  that  is  thirty  (30)  days  after  the
                         issuance by National of a statement  of  operations  as
                         part of its standard  quarterly  earnings press release
                         for the  quarterly  period  ending  August 29, 2004, an
                         amount equal to 94% of (A) the amount  specified in the
                         table  below  under  the  heading  "Aggregate  Earn-Out
                         Amount"   corresponding  to  the  aggregate  amount  of
                         Revenue  recognized by National from the Effective Time
                         through   August  29,   2004  from  sales  of  products
                         incorporating  DQ  Technology  set  forth in the  table
                         below under the heading "Revenue Amount" divided by (B)
                         the  sum  of  (x)  the   total   number  of  shares  of
                         DigitalQuake Common Stock outstanding three days before
                         the  Closing  Date  (other than shares held by National
                         and its  Subsidiaries)  plus (y) the  total  number  of
                         shares  of  DigitalQuake  Common  Stock  issuable  upon
                         conversion of shares of  DigitalQuake  Preferred  Stock
                         (other   than   shares   held  by   National   and  its
                         Subsidiaries) outstanding three days before the Closing
                         Date   plus  (z)  the   total   number   of  shares  of
                         DigitalQuake   Common  Stock  subject  to  DigitalQuake
                         Options,   warrants  or  other  convertible  securities
                         (other   than   those   held   by   National   and  its
                         Subsidiaries) outstanding three days before the Closing
                         Date.

              Revenue Amount                    Aggregate Earn-Out Amount
              --------------                    -------------------------

        Greater than $66,000,000                     $   3,000,000

        $33,000,000 to $66,000,000                   $   1,000,000

        Less than $33,000,000                        $           0


                         For purposes of this Section  3.2(c),  "Revenue"  shall
                         mean those sales by National and its Subsidiaries that,
                         according to generally accepted  accounting  principles
                         and National's  revenue  recognition  policies,  may be
                         recognized  as revenue  and that have been  reported as
                         revenue  in  a  quarterly   statement   of   operations
                         published  by National as part of a quarterly  earnings
                         press   release,   and  "DQ   Technology"   shall  mean
                         DigitalQuake's   (i)  present  scaler  technology  with
                         third-  or  fourth-generation  scaler  algorithms,   or
                         future  generations  thereof;  (ii)  80 MHz  to  160MHz
                         triple analog-digital  converter and phase-locked loop,
                         or  future  generations  thereof;  (iii)  digital-video
                         interface receiver, or future generations thereof; (iv)
                         high-definition    content   protection,    or   future
                         generations  thereof;  or (v)  high-resolution  digital
                         phase-locked loop, or future generations  thereof.  For
                         the sake of clarity,  the Parties  understand and agree
                         that  DigitalQuake  will be credited the full amount of
                         Revenue   generated   by   the   sale   of  a   product
                         incorporating  DQ  Technology  even where DQ Technology
                         comprises only a portion of such product.


               (d)  The amounts  described in clauses (a) - (c) shall be paid in
                    accordance  with Section 3.6;  provided,  however,  that the
                    aggregate amount payable to each Principal Employee pursuant
                    to  clause  (i) of  paragraph  (c)  above  shall be  further
                    subject to Section 3.5; and provided  further that  payments
                    with  respect to shares of  Restricted  DigitalQuake  Common
                    Stock shall be subject to Section  3.4(e) and payments  with
                    respect to such shares and any other shares of  DigitalQuake
                    Common  Stock  that are  subject  to  forfeiture,  rights of
                    repurchase   at  the   exercise   price  or  other   vesting
                    restrictions as of the date hereof or the Closing Date shall
                    be subject to Section 3.9.

               (e)  On behalf of the  Shareholders  and holders of  DigitalQuake
                    Options on the Closing  Date,  Paul Lessard (or in the event
                    that Paul  Lessard is no longer  employed by  National,  the
                    next-highest level manager of DigitalQuake immediately prior
                    to the  Effective  Time  who  continues  to be  employed  by
                    National)  shall  have  access  to  National's   proprietary
                    financial information system,  EXPERTs, for the sole purpose
                    of monitoring  Revenue (as defined in this Section 3.2), and
                    not  for  the  purpose  of  reviewing  or  monitoring  other
                    National sales data or revenues.

               (f)  Notwithstanding   the  earn-out  components  of  the  Merger
                    consideration,   the  parties   understand  and  agree  that
                    National  shall  be  entitled  to  operate  DigitalQuake  in
                    accordance with National's  business judgment  following the
                    Merger without  liability to  DigitalQuake,  the Founders or
                    the  Shareholders  for  failure  to  maximize  the  payments
                    contemplated  by  clauses  (ii) and  (iii)  of this  Section
                    3.2(c).

               (g)  Concurrently with the making of the payments contemplated by
                    clauses (ii) of Section 3.2(c),  if any,  National shall pay
                    to Toan Tran an amount equal to 6% of the product of clauses
                    (A) and (B) of clause  (ii) of  Section  3.2(c)  (the  "2003
                    Gross Earn-Out  Amount Per Share")  multiplied by the number
                    of shares of DigitalQuake Common Stock (other than shares of
                    Restricted    DigitalQuake    Common   Stock)    outstanding
                    immediately  prior  to  the  Effective  Time.  In  addition,
                    concurrently with the making of the payments contemplated by
                    clauses (iii) of Section 3.2(c),  if any, National shall pay
                    to Toan Tran an amount equal to 6% of the product of clauses
                    (A) and (B) of clause  (iii) of  Section  3.2(c)  (the "2004
                    Gross Earn-Out  Amount Per Share")  multiplied by the number
                    of shares of DigitalQuake Common Stock (other than shares of
                    Restricted    DigitalQuake    Common   Stock)    outstanding
                    immediately prior to the Effective Time."

          7. The following paragraphs shall be added to the end of Section 3.4:

          "(d) Earn-Out Payments on DigitalQuake Options. For each Digital Quake
     Option that is not exercised  prior to the Effective  Time,  National shall
     make  the  following  payments  on  the  following  dates,  subject  to the
     limitations set forth below:

                    (i)  on the date that is thirty (30) days after the issuance
                         by National of a statement of operations as part of its
                         standard  quarterly  earnings  press  release  for  the
                         quarterly  period  ending  August 24,  2003,  an amount
                         equal to (A) the amount  payable  with  respect to each
                         share of DigitalQuake  Common Stock pursuant to Section
                         3.2(c)(ii) above multiplied by (B) the number of shares
                         of   DigitalQuake   Common   Stock   subject   to  such
                         DigitalQuake  Option immediately prior to the Effective
                         Time,  reduced by the amount of any  withholding  taxes
                         that may be required on such  payment  (which  National
                         shall  cause  DigitalQuake  to  duly  withhold  for the
                         amount of such Optionee); provided that with respect to
                         any DigitalQuake  Option that is not fully vested as of
                         the  Effective  Time  (after  taking  into  account any
                         acceleration  of vesting  triggered by the Merger under
                         the  terms  of  the  applicable  DigitalQuake  Option),
                         National  shall have no obligation to make a payment to
                         the former holder of such DigitalQuake  Option pursuant
                         to this clause (i) unless the holder  remains  employed
                         by DigitalQuake or National and otherwise satisfies the
                         requirements for continued  vesting of the DigitalQuake
                         Option in question  through  the date of such  payment;
                         and

                    (ii) on the date that is thirty (30) days after the issuance
                         by National of a statement of operations as part of its
                         standard  quarterly  earnings  press  release  for  the
                         quarterly  period  ending  August 29,  2004,  an amount
                         equal to (A) the amount  payable  with  respect to each
                         share of DigitalQuake  Common Stock pursuant to Section
                         3.2(c)(iii)  above  multiplied  by (B)  the  number  of
                         shares of  DigitalQuake  Common  Stock  subject to such
                         DigitalQuake  Option immediately prior to the Effective
                         Time,  reduced by the amount of any  withholding  taxes
                         that may be required on such  payment  (which  National
                         shall  cause  DigitalQuake  to  duly  withhold  for the
                         amount of such Optionee); provided that with respect to
                         any DigitalQuake  Option that is not fully vested as of
                         the  Effective  Time  (after  taking  into  account any
                         acceleration  of vesting  triggered by the Merger under
                         the  terms  of  the  applicable  DigitalQuake  Option),
                         National  shall have no obligation to make a payment to
                         the former holder of such DigitalQuake  Option pursuant
                         to this clause (ii) unless the holder remains  employed
                         by DigitalQuake or National and otherwise satisfies the
                         requirements for continued  vesting of the DigitalQuake
                         Option in question through the date of such payment.

               (e)  Restricted   DigitalQuake   Common  Stock.   Notwithstanding
                    Section 3.2(c)(i) above, in the case of shares of Restricted
                    Digital  Quake  Common  Stock,  in lieu of the payment  that
                    National  otherwise  would be required  to make  immediately
                    following  the  Effective  Time  pursuant  to  such  Section
                    3.2(c)(i),  National shall make semi-annual cash payments to
                    the former holders of such shares of Restricted DigitalQuake
                    Common Stock  beginning six months after the Effective Time.
                    Each  such  payment  shall  be in an  amount  equal  to  the
                    Adjusted Per Share Price  multiplied by the Restricted Stock
                    Semi-Annual  Increment  provided  that  the  holder  remains
                    employed by DigitalQuake or National and otherwise satisfies
                    the  requirements  for continued  vesting of the  Restricted
                    DigitalQuake  Common  Stock in question (as set forth in the
                    DigitalQuake  Option  pursuant  to which  such  shares  were
                    issued) through the date of such payment.  "Restricted Stock
                    Semi-Annual  Increment" shall mean the number of shares,  if
                    any, of Restricted DigitalQuake Common Stock that would have
                    vested  during the  six-month  period  ending on the date of
                    such  payment if such shares had  remained  outstanding  and
                    continued  to vest  in  accordance  with  the  terms  of the
                    DigitalQuake  Option  pursuant  to which  they were  issued.
                    After  semi-annual  payments  have been made with respect to
                    all shares of Restricted DigitalQuake Common Stock held by a
                    holder  immediately  prior to the Effective Time, no further
                    semi-annual  payments to such holder shall be  required.  In
                    addition, any semi-annual payments with respect to shares of
                    Restricted DigitalQuake Common Stock shall cease immediately
                    upon the  termination of the holder's  employment.  Further,
                    notwithstanding  clauses  (ii) and (iii) of Section  3.2(c),
                    National  shall have no  obligation to make a payment to the
                    former  holder of shares of Restricted  DigitalQuake  Common
                    Stock  pursuant  to clause  (ii) or (iii) of Section  3.2(c)
                    unless  the  holder  remains  employed  by  DigitalQuake  or
                    National  and  otherwise   satisfies  the  requirements  for
                    continued  vesting  of the  Restricted  DigitalQuake  Common
                    Stock under the terms of the DigitalQuake Option pursuant to
                    which such  shares  were  granted  through  the date of such
                    payment.


               (f)  Finder's  Fee  on  Earn-Out  Amounts  Paid  on  DigitalQuake
                    Options   and   Restricted    DigitalQuake   Common   Stock.
                    Concurrently  with the making of the  payments to holders of
                    DigitalQuake  Common  Stock  contemplated  by clause (ii) of
                    Section  3.2(c),  National  shall pay to Toan Tran an amount
                    equal to 6% of the 2003  Gross  Earn-Out  Amount  Per  Share
                    multiplied  by the  sum of  (x)  the  number  of  shares  of
                    DigitalQuake  Common Stock subject to  DigitalQuake  Options
                    with  respect to which  National is required to make payment
                    pursuant to clause (i) of Section 3.4(d) plus (y) the number
                    of shares  of  Restricted  DigitalQuake  Common  Stock  with
                    respect  to  which  National  is  required  to make  payment
                    pursuant to Section 3.4(e).  In addition,  concurrently with
                    the making of the payments to holders of DigitalQuake Common
                    Stock  contemplated  by  clause  (iii)  of  Section  3.2(c),
                    National shall pay to Toan Tran an amount equal to 6% of (A)
                    the 2004 Gross Earn-Out  Amount Per Share  multiplied by (B)
                    the sum of (x) the number of shares of  DigitalQuake  Common
                    Stock subject to DigitalQuake  Options with respect to which
                    National is required to make payment pursuant to clause (ii)
                    of  Section   3.4(d)  plus  (y)  the  number  of  shares  of
                    Restricted  DigitalQuake  Common Stock with respect to which
                    National  is required  to make  payment  pursuant to Section
                    3.4(e)."

          8.   Clauses  (b) and (c) of  Section  3.5 of the  Agreement  shall be
               revised to state in their entirety as follows:

               "(b) The second  installment  payable to each Principal  Employee
                    with   respect  to  his   DigitalQuake   Common   Stock  and
                    DigitalQuake  Option(s)  shall be due and  payable on August
                    24, 2003; and

               (c)  The third  installment  payable to each  Principal  Employee
                    with   respect  to  his   DigitalQuake   Common   Stock  and
                    DigitalQuake  Option(s)  shall be due and  payable on August
                    29, 2004."

          9.   Section 3.6(a) of the Agreement  shall be revised to state in its
               entirety as follows:

               "(a) As soon as practicable after the Effective Time, each Person
                    holding a certificate or certificates representing shares of
                    DigitalQuake  Common Stock or  DigitalQuake  Preferred Stock
                    issued and  outstanding  immediately  prior to the Effective
                    Time  shall  deliver  such   certificate(s),   a  letter  of
                    transmittal in the form attached hereto as Exhibit E-1 and a
                    Form W-9 or Form W-8 (or a  suitable  substitute  form),  as
                    applicable,  to the  Surviving  Corporation  or its transfer
                    agent.  In the event  that any such  holder no longer has in
                    his or her  possession any such  certificate(s)  (other than
                    certificates  representing  shares  of  DigitalQuake  Common
                    Stock held in escrow by DigitalQuake), such holder shall, in
                    lieu  of  surrendering  such   certificate(s),   deliver  to
                    Surviving  Corporation  an affidavit of that fact  whereupon
                    National may, in its sole discretion,  require the holder of
                    such lost  certificate(s)  to  deliver a bond in such sum as

                    National  may  reasonably  direct as  indemnity  against any
                    claim  that  may  be  made  against  National  or any of its
                    Affiliates  with  respect to the  certificate.  Each  Person
                    owning shares of DigitalQuake Common Stock held in escrow by
                    DigitalQuake   in   accordance   with   the   terms  of  the
                    DigitalQuake  Option  pursuant  to which  such  shares  were
                    issued  shall  deliver a letter of  transmittal  in the form
                    attached  hereto as  Exhibit  E-2 and a Form W-9 or Form W-8
                    (or a suitable substitute form), as applicable, to Surviving
                    Corporation or its transfer agent.  Thereupon, in each case,
                    each such  holder  shall be  entitled to receive in exchange
                    therefor cash  consideration in the amount and in the manner
                    described  in Section 3.2,  3.4(e) and Section 3.5,  without
                    interest,  and Surviving  Corporation shall pay and National
                    shall  cause  Surviving   Corporation  to  pay  such  amount
                    promptly to the holder."

          10.  The first sentence of the first  unnumbered  paragraph of Article
               IV of the Agreement  shall be revised to state in its entirety as
               follows:

          "DigitalQuake  and each of the Founders jointly and severally make the
     following  representations and warranties to National and Merger Sub, which
     representations  and  warranties are true and correct as of the date hereof
     and will be true and correct as of the Closing Date, except as set forth in
     the disclosure  schedule  delivered by  DigitalQuake to National and Merger
     Sub on the date hereof, as the same shall be updated on the August 29, 2002
     [the date of the Amendment] with respect to events or circumstances arising
     between the date hereof and August 29, 2002 (the "Disclosure Schedule")."

          11.  The first  sentence  of  Section  8.1 of the  Agreement  shall be
               revised to state in its entirety as follows:

          "All  representations  and  warranties  of  National  and  Merger  Sub
     contained  in this  Agreement  and in the First  Amendment  to  Option  and
     Agreement  and Plan of Merger  entered  into as of August  29,  2002 by and
     among   National,   Merger  Sub,   DigitalQuake,   and  the  Founders  (the
     "Amendment")  shall be true and correct in all material  respects at and as
     of the Closing Date as if such  representations and warranties were made at
     and as of the Closing Date (without giving effect to any  limitations  with
     respect  to  materiality  set  forth  therein)  except  as would not have a
     Material Adverse Effect on National or Merger Sub."

          12.  The first  sentence  of  Section  9.1 of the  Agreement  shall be
               revised to state in its entirety as follows:

          "All representations and warranties of DigitalQuake  contained in this
     Agreement  and in the  Amendment  shall be true and correct in all material
     respects  at and as of the  Closing  Date  as if such  representations  and
     warranties  were made at and as of the Closing Date (without  giving effect
     to any limitations with respect to materiality set forth therein)."

          13.  The following paragraph shall be added as a newly created Section
               9.13:


          "9.13  Consents of Holders of  Restricted  DigitalQuake  Common Stock.
     DigitalQuake  shall have  delivered  to National  consents  from all of the
     holders of shares of Restricted  DigitalQuake  Common Stock issued prior to
     the Effective Time  approving of the treatment of such shares  contemplated
     by the Agreement, as amended by the Amendment,  and the termination of such
     holders'  rights under the  DigitalQuake  Option(s)  pursuant to which such
     shares were issued."

          14.  The following  sentence shall be added to the end of Section 14.5
               of the Agreement:

          "Upon the Effective  Time,  this Agreement and the Agreement of Merger
     shall supersede all DigitalQuake Options,  which DigitalQuake Options shall
     automatically be terminated as of the Closing, including without limitation
     any  provisions  thereof  relating to  DigitalQuake's  rights to repurchase
     shares of Restricted DigitalQuake Common Stock issued upon exercise of such
     DigitalQuake Options."

          15.  Each of Exhibit A,  Exhibit B, Exhibit C, Exhibit F and Exhibit G
               to the Agreement  shall be replaced in its entirety by Exhibit A,
               Exhibit  B,   Exhibit  C,   Exhibit  F  and   Exhibit  G  hereto,
               respectively. Exhibit E to the Agreement shall be replaced in its
               entirety by Exhibit E-1 and Exhibit E-2 hereto.  Schedule  1.1(c)
               to the  Agreement  shall be replaced in its  entirety by Schedule
               1.1(c) hereto.

          16.  DigitalQuake  and the Founders  represent and warrant as follows:
               DigitalQuake  has all necessary power and authority to enter into
               this  Amendment and has taken all corporate  action  necessary to
               consummate  the  transactions  contemplated  by the  Agreement as
               amended  hereby and to perform its  obligations  thereunder.  The
               execution and delivery of this  Amendment and the  performance by
               DigitalQuake  of its  obligations  under the Agreement as amended
               hereby  and the  consummation  of the  transactions  contemplated
               thereby,  including the Merger, have been unanimously approved by
               the  Board  of  Directors   and   unanimously   approved  by  the
               shareholders of DigitalQuake.  Certified resolutions of the Board
               of  Directors  and  written   consents  of  the  shareholders  of
               DigitalQuake  have been provided to National,  there have been no
               changes  to  such  resolutions  or  written  consents,  and  such
               resolutions and written consents remain in full force and effect.
               Each of the Founders  has all  necessary  power and  authority to
               enter into this  Amendment and has taken all action  necessary to
               consummate  the  transactions  contemplated  by the  Agreement as
               amended hereby and to perform its  obligations  thereunder.  This
               Amendment has been duly  executed and  delivered by  DigitalQuake
               and the Founders and is a legal,  valid and binding obligation of
               DigitalQuake,  and the Founders, enforceable against each of them
               in accordance with its terms,  except that  enforceability may be
               limited by the effect of bankruptcy, insolvency,  reorganization,
               moratorium  or other  similar laws  relating to or affecting  the
               rights of creditors.

          17.  National and Merger Sub represent and warrant as follows: Each of
               National  and Merger Sub has all  requisite  corporate  power and
               authority,  and has  taken  all  corporate  action  necessary  to
               execute  and  deliver   this   Amendment,   to   consummate   the
               transactions  contemplated by the Agreement as amended hereby and
               to perform its obligations  thereunder.   This Amendment has been
               duly  executed  and  delivered by each of National and Merger Sub
               and is a legal,  valid and binding  obligation  of  National  and
               Merger Sub,  enforceable  against each of them in accordance with
               its  terms,  except  that  enforceability  may be  limited by the
               effect of bankruptcy, insolvency,  reorganization,  moratorium or
               other  similar  laws  relating  to or  affecting  the  rights  of
               creditors.


          18.  The  effectiveness  of  this  Amendment  is  subject  to (a)  the
               delivery  by  DigitalQuake  to  National  concurrently  with  the
               execution  and delivery  hereof of certified  resolutions  of the
               Board of Directors and written  consents of the  shareholders  of
               DigitalQuake  unanimously approving the execution and delivery of
               this  Amendment  and  the  performance  by  DigitalQuake  of  its
               obligations  under  the  Agreement  as  amended  hereby  and  the
               consummation of the transactions contemplated thereby,  including
               the  Merger,  (b) the  delivery  by  Merger  Sub to  DigitalQuake
               concurrently  with the execution and delivery hereof of copies of
               the  resolutions of the Board of Directors and written consent of
               the sole  shareholder  of Merger Sub  unanimously  approving  the
               execution and delivery of this  Amendment and the  performance by
               Merger  Sub of its  obligations  under the  Agreement  as amended
               hereby  and the  consummation  of the  transactions  contemplated
               thereby,  including  the Merger,  (c) the delivery by National to
               DigitalQuake  of  a  Merger  Option  Notice  which  specifies  an
               anticipated  Closing  Date of August 29,  2002,  (d)  delivery by
               DigitalQuake  to National of consents  from all of the holders of
               shares of Restricted  DigitalQuake  Common Stock to the treatment
               of such shares contemplated by the Agreement,  as amended hereby,
               (e) the  delivery  by the  parties  to  Latham &  Watkins  of the
               Agreement  of  Merger  attached  as  Exhibit  A to hold in escrow
               pending  receipt of notice from  National  that the  Agreement of
               Merger should be dated and submitted to the Secretary of State of
               the State of  California  for  filing,  and (f) the  delivery  by
               DigitalQuake to National of Non-Compete  Agreements signed by the
               individuals listed or described on Schedule 1.1(d) and Employment
               Agreements  signed  by the  individuals  listed or  described  on
               Schedule 1.1(b).  Prior to such deliveries,  this Amendment shall
               have no force or effect.

          19.  This Amendment may be executed in one or more  counterparts,  and
               by different  parties  hereto in separate  counterparts,  each of
               which when executed shall be deemed to be an original,  including
               counterparts  transmitted  by  facsimile,  but all of which taken
               together shall constitute one and the same agreement. Capitalized
               terms used  herein  without  definition  shall have the  meanings
               given to such terms in the Agreement.

          20.  On and after the date hereof, each reference in the Agreement and
               in any of the Ancillary  Agreements to the "Agreement" shall mean
               the Agreement as amended hereby.  Except as specifically  amended
               above, the Agreement shall remain in full force and effect and is
               hereby  ratified  and  confirmed.  The  execution,  delivery  and
               effectiveness  of this Amendment  shall not,  except as expressly
               provided  herein,  operate  as a waiver  of any  right,  power or
               remedy  of any  party  hereto,  nor  constitute  a waiver  of any
               provision of the Agreement.


                            [Signature page follows]



     IN WITNESS  WHEREOF,  the parties  hereto have executed  this  Amendment or
caused this Amendment to be duly executed on its behalf by its officer thereunto
duly authorized, as of the day and year first above written.

                                NATIONAL SEMICONDUCTOR CORPORATION,
                                a Delaware corporation


                                By: //S// DONALD MACLEOD
                                Name:
                                Its:


                                NINTAI ACQUISITION SUB, INC.,
                                a California corporation


                                By: //S// DONALD MACLEOD
                                Name:
                                Its:


                                DIGITALQUAKE, INC.,
                                a California corporation


                                By: //S// PAUL A. LESSARD
                                Name:
                                Its:


                                PAUL A. LESSARD

                                //S// PAUL A. LESSARD



                                MICHAEL G. FUNG

                                //S// MICHAEL G. FUNG