EXHIBIT 99.1


                                  July 21, 2003

Ralph V. Whitworth
Relational Investors, L.P.
11975 El Camino Real, Suite 300
San Diego, CA 92130

Dear Mr. Whitworth:

Upon receipt of an executed counterpart hereof, this letter will be an agreement
(the  "Agreement")  between  Relational  Investors,  L.P.  (the  "Partnership"),
Relational  Investors  LLC  ("Relational   Investors,"  and  together  with  the
Partnership and their  respective  "affiliates," as such term is defined or used
in Rule  145 of the  Securities  Act of  1993,  as  amended,  "Relational")  and
National  Semiconductor  Corporation  (the  "Company"),   with  respect  to  the
following matters:

1.   WITHDRAWAL  OF THE NOTICE OF  NOMINATION.  By letter  dated June 19,  2003,
     Relational  provided  written  notice of its intention to nominate Ralph V.
     Whitworth  ("Whitworth")  and David H. Batchelder for election to the Board
     of  Directors  of the Company (the  "Board") at the  Company's  2003 annual
     stockholders  meeting.  Effective  upon the  execution  and delivery of the
     Agreement by all parties  hereto,  Relational  irrevocably  withdraws  such
     nominations.

2.   MEETING WITH THE BOARD.

     (a)  Relational will be entitled to attend the regularly  scheduled meeting
          of the Board that most closely  precedes the  expiration of the notice
          period provided in Article II Section 9(a)(2) of the Company's by-laws
          for making  nominations  of persons  for  election to the Board at the
          Company's  2004  annual  meeting.   At  such  meeting  of  the  Board,
          Relational  shall be entitled to discuss  with the Board  Relational's
          concerns and  recommendations,  if any,  regarding the Company.  It is
          expected that Relational's presentations and discussion at the meeting
          would  last  for  approximately  one  and  one-half  hours,  and  that
          Relational would not attend the entire meeting.

     (b)  Until the 2004  annual  meeting of  stockholders,  representatives  of
          senior  management  and the Board of the Company will make  themselves
          available to meet with  representatives  of  Relational  at reasonable
          times and intervals; provided, however, that representatives of senior
          management  will be  available  for such  meetings  at least  once per
          fiscal quarter if requested by Relational.

     (c)  Relational  acknowledges  and agrees that the meetings  with the Board
          and  management  contemplated  by this  Section 2 will be conducted in
          compliance with Regulation FD and other applicable  federal securities
          law, so as not to trigger a requirement  that the Company disclose any
          material non-public information regarding the Company.

3.   2004 ANNUAL MEETING.

     (a)  If Relational  reasonably does not believe that the performance of the
          Company was satisfactory,  Relational shall have the right in its sole
          discretion,  upon providing  written notice that complies as to timing
          and  substance  as set forth  under  Article  II  Section  9(a) of the
          Company's by-laws, to nominate Whitworth for election to the Board, in
          which  case  the  Company  shall  include  Whitworth's  name  and  the
          information  required  by the  federal  securities  laws  both  in the
          Company's  2004 annual  meeting  proxy  statement and on the Company's
          proxy card relating to the Company's  2004 annual  meeting;  provided,
          however, that the Company reserves its right to oppose the election of
          Whitworth  to the Board at such annual  meeting.  The  Company  hereby
          acknowledges and agrees that the materials  submitted by Relational to
          nominate  Relational's  two  nominees  for election at the 2003 annual
          meeting of stockholders  are acceptable  instruments of nomination and
          that nominating materials substantially in the same form (with factual
          information  updated to the extent necessary to reflect changes or new
          information)  will be  accepted  by the  Company  in  connection  with
          Relational's  nomination  of Whitworth for election at the 2004 annual
          meeting.

     (b)  If  Relational  nominates  Whitworth  for  election at the 2004 annual
          meeting pursuant to Section 3(a) above,  Relational shall not nominate
          any other  candidates  for election to the Board at the Company's 2004
          annual meeting,  or participate in any solicitation of proxies for the
          election  of  directors  other  than  Whitworth  or  other  candidates
          recommended for election by the Board.

     (c)  If Relational  elects to nominate  Whitworth for election  pursuant to
          Section 3(a), the Company and Relational  shall each have the right to
          include a statement of no more than 500 words in the  Company's  proxy
          statement  in  support of their  respective  positions  regarding  the
          election of Whitworth.

     (d)  Notwithstanding Section 3(c), each of the Company and Relational would
          have  the  independent  right  to  publish  or  distribute  any  other
          additional  proxy  solicitation  materials  (subject  to Section  3(b)
          above)  regarding  the  Whitworth   nomination  and  their  respective
          positions concerning the election of directors.

     (e)  Relational  will have the reasonable  right to review all  preliminary
          and definitive proxy materials filed by the Company. In addition,  the
          Company  covenants  and agrees that the proxy  statement and all proxy
          cards used by the Company with  respect to the 2004 annual  meeting of
          stockholders  will  feature  Whitworth's  name in the same font  size,
          style and leading as used for the Company's nominees. In addition, the
          Company and Relational  shall consult with each other in designing the
          proxy  card such that it  accords  fair and  comparable  treatment  to
          Whitworth as is accorded to the other Company nominees, including with
          respect to  withholding  authority  and other  relevant  matters.  (f)
          Relational  represents that all statements and  information  regarding
          Whitworth provided for inclusion in the Company's proxy materials will
          be accurate and complete in all material respects and will comply with
          all applicable law.


4.   2005 ANNUAL MEETING.  If Whitworth is elected to the Board at the Company's
     2004 annual  meeting and if Relational  so requests,  (i) the Company shall
     include  Whitworth  as a  nominee  to the  Board on the  slate of  nominees
     recommended by the Board in the Company's  proxy statement and on its proxy
     card  relating  to the  Company's  2005  annual  meeting  of  stockholders,
     (ii) Relational  shall be  entitled  to review and  reasonably  approve the
     statements made regarding Whitworth in the Company's proxy materials, (iii)
     Whitworth's  name and the  information  regarding  Whitworth  will  receive
     comparable  treatment (as to  prominence,  location and  appearance) as the
     Company's nominees in the Company's proxy statement and proxy cards for the
     2005 annual  meeting,  and (iv) if Whitworth  is included in the  Company's
     proxy  statement  and proxy card,  Relational  shall not nominate any other
     candidates for election to the Board at the Company's 2005 annual  meeting,
     or participate in any solicitation of proxies for the election of directors
     other than Whitworth or other  candidates  recommended  for election by the
     Board.

5.   5%  OWNERSHIP.  If  Relational  ceases  to own 5% or more of the  currently
     outstanding  common  stock  of the  Company  at any  time,  this  Agreement
     automatically shall terminate and be of no further force or effect, without
     any further action by the Company or Relational.

6.   GOVERNING  LAW.  This  Agreement  shall be  governed  by and  construed  in
     accordance with the laws of the State of Delaware.

7.   INJUNCTIVE RELIEF; SPECIFIC PERFORMANCE.  The parties acknowledge and agree
     that an action  for breach of  contract  and an award of  monetary  damages
     alone would not be adequate to compensate the  non-breaching  party for the
     substantial  harm which would  result from any such breach or  violation of
     this  Agreement.   Accordingly,  the  parties  hereby  unconditionally  and
     irrevocably  agree  that in the  event of such a breach or  violation,  the
     non-breaching  party  shall be  entitled  to  injunctive  relief  and other
     remedies  (including,  without limitation,  seeking specific performance of
     the terms of this  Agreement),  in addition to any other rights or remedies
     available  at  law or in  equity,  all  of  which  shall  be  deemed  to be
     cumulative and not alternative or exclusive.

8.   COMPLETE AGREEMENT; AMENDMENT; WAIVER; GOVERNING LAW; EXECUTION; AUTHORITY.
     This Agreement  represents the complete and final  agreement of the parties
     with respect to its subject matter and  supersedes all prior  negotiations,
     discussions,  agreements  or  understandings  with  respect to such subject
     matter.  The parties further  acknowledge  that each party is not executing
     this Agreement in reliance on any promise,  representation  or warranty not
     contained  in this  Agreement.  This  Agreement  may be  amended  only by a
     written agreement executed by each of the parties thereto. No breach of any
     provision  herein may be waived unless such waiver is in writing and signed
     by the  party to be bound.  This  document  may be  executed  by  facsimile
     signature and in multiple counterparts, each of which shall be deemed to be
     an original, but all of which shall constitute one and the same agreement.



If you are in agreement with the foregoing,  please so signify by signing in the
space provided below.

                                        Very truly yours,

                                        NATIONAL SEMICONDUCTOR CORPORATION


                                        By:       //S// JOHN M. CLARK III
                                        John M. Clark, III
                                        Senior Vice President, General
                                        Counsel and Secretary


Accepted and agreed as of the date set forth above.

RELATIONAL INVESTORS, L.P.,
a Delaware limited partnership

By:      RELATIONAL INVESTORS LLC,
         a Delaware limited liability company

Its:     General Partner


         By:       //S// RALPH V. WHITWORTH
                  Ralph V. Whitworth
                  Principal



RELATIONAL INVESTORS LLC,
a Delaware limited liability company


By:      //S// RALPH V. WHITWORTH
         Ralph V. Whitworth
         Principal