Document:

<PAGE>

                            FIFTH AMENDMENT TO LEASE

     THIS FIFTH AMENDMENT TO LEASE (this "Amendment") is made by and between
CHEVRON U.S.A. INC., a Pennsylvania corporation ("Landlord") and TEXAS
MICRO-SYSTEMS, INC., a Texas corporation ("Tenant"), made effective the 17th day
of October, 1995.

                                   WITNESSETH:

     WHEREAS, Landlord and Tenant did enter into that certain lease (the
"Lease") dated December 11, 1992, as amended effective February 24, 1993, and
October 28, 1993, and July 10, 1995, and July 17, 1995 for certain leased space
situated in the Building known as 5959 Corporate Drive, Houston, Texas; and

     WHEREAS, Landlord and Tenant again desire to amend the Lease as set forth
herein;

     NOW THEREFORE, Landlord and Tenant in consideration of the premises and the
mutual benefits to be derived therefrom, do hereby covenant, stipulate and
agree, each with the other, to the following terms, covenants, conditions and
obligations as an amendment to the Lease:

     1.   All terms, covenants, obligations and conditions in this Amendment
          which conflict with a like provision in the Lease shall be controlling
          over and supersede any like provision in the Lease.

     2.   All terms, covenants, obligations and conditions in the Lease not
          superseded and/or amended by any provision in this Amendment shall
          remain in full force and effect. All defined terms in the Lease shall
          have the same meaning in this Amendment.

     3.   Tenant's preferential right to lease the two South Quadrants on the
          second level of the Building, as provided for in the Third Amendment
          to the Lease, dated July 10, 1995, is hereby extinguished and shall no
          longer exist.

     Made as of the date first written above.

LANDLORD                                     TENANT

CHEVRON U.S.A. INC.                          TEXAS MICRO-SYSTEMS, INC.

By       GARY SCHUMAN                        By       MICHAEL STEWART
  -------------------------------              --------------------------------

Its      Lease Manager                       Its      President
   ------------------------------               -------------------------------<PAGE>

                            SIXTH AMENDMENT TO LEASE

     THIS SIXTH AMENDMENT TO LEASE (this "Amendment") is made by and between
CHEVRON U.S.A. INC., a Pennsylvania corporation ("Landlord") and TEXAS MICRO
INC., a Delaware corporation, successor in interest to TEXAS MICRO-SYSTEMS,
INC., a Texas corporation ("Tenant"), made effective the 28th day of April,
1997.

                                   WITNESSETH:

     WHEREAS, Landlord and Tenant did enter into that certain lease (the
"Lease") dated December 11, 1992, as amended effective February 24, 1993, and
October 28, 1993, and July 10, 1995, and July 31, 1995, and October 17, 1995 for
certain leased space situated in the Building known as 5959 Corporate Drive,
Houston, Texas; and

     WHEREAS, Landlord and Tenant again desire to amend the Lease as set forth
herein;

     NOW THEREFORE, Landlord and Tenant in consideration of the premises and the
mutual benefits to be derived therefrom, do hereby covenant, stipulate and
agree, each with the other, to the following terms, covenants, conditions and
obligations as an amendment to the Lease:

     1.   All terms, covenants, obligations and conditions in this Amendment
          which conflict with a like provision in the Lease shall be controlling
          over and supersede any like provision in the Lease.

     2.   All terms, covenants, obligations and conditions in the Lease not
          superseded and/or amended by any provision in this Amendment shall
          remain in full force and effect. All defined terms in the Lease shall
          have the same meaning in this Amendment.

     3.   Tenant's preferential right to lease the Northeast Quadrant on the
          first floor of the Building, as provided for in Section 26.03 of the
          Lease, is hereby extinguished and shall no longer exist.

     Made as of the date first written above.

LANDLORD                                TENANT

CHEVRON U.S.A. INC.                     TEXAS MICRO-SYSTEMS, INC.

By       GARY SCHUMAN                   By       MICHAEL STEWART
  -----------------------------           --------------------------------
Its      Lease Manager                  Its      President and CEO
   ----------------------------            -------------------------------<PAGE>

                           SEVENTH AMENDMENT TO LEASE

     THIS SEVENTH AMENDMENT TO LEASE (this "Seventh Amendment") is made by and
between CHEVRON U.S.A. INC., a Pennsylvania corporation ("Landlord") and TEXAS
MICRO INC., a Delaware corporation ("Tenant"), effective the 12th day of
November, 1997.

                                   WITNESSETH:

     WHEREAS, Landlord and Tenant did enter into that certain lease (the
"Lease") dated December 11, 1992, and as amended effective February 24, 1993,
and October 28, 1993, and July 10, 1995, and July 31, 1995, and October 17, 1995
and April 28, 1997 for certain leased space situated in the Building known as
5959 Corporate Drive, Houston, Texas; and

     WHEREAS, Landlord and Tenant again desire to amend the Lease as set forth
herein;

     NOW THEREFORE, Landlord and Tenant in consideration of the premises and the
mutual benefits to be derived therefrom, do hereby covenant, stipulate and
agree, each with the other, to the following terms, covenants, conditions and
obligations as an amendment to the Lease:

     1.   All terms, covenants, obligations and conditions in this Amendment
          which conflict with a like provision in the Lease shall be controlling
          over and supersede any like provision in the Lease.

     2.   All terms, covenants, obligations and conditions in the Lease not
          superseded and/or amended by any provision in this Amendment shall
          remain in full force and effect. All defined terms in the Lease shall
          have the same definition in this Amendment.

     3.   Effective November 12, 1997, Article 1, Section 1.01 of the Lease is
          amended to include within the Premises approximately 8,349 square feet
          of Net Rentable Area located in the Basement of the Building (the
          "Additional Basement Space") as shown on Exhibit A attached hereto and
          incorporated herein.

     4.   The Base Rent is $4.00 per square foot of Net Rentable Area per annum
          through November 30, 1998 for the Additional Basement Space. Effective
          December 1, 1998 the Base Rent will increase to $4.50 per square foot
          of Net Rentable Area per annum.

     5.   Tenant will take the Additional Basement Space on an "AS IS" basis,
          agreeing that it is to be used for storage purposes only, and that no
          air-conditioning is to be provided to such Additional Basement Space.
          Landlord reserves the right to substitute for the Additional Basement
          Space an equally sized area of space in the Building (+/- 20%),
          effective thirty (30) days from Landlord's written notice thereof to
          Tenant. Any reasonable costs associated with the movement of
          furniture, equipment or other material then in storage due to such
          relocation shall be borne by

<PAGE>

          Landlord, but in no event will Landlord bear responsibility for said
          relocation costs in excess of $2,000.00.

     6.   Effective December 1, 1998, Tenant may cancel this Seventh Amendment,
          upon advance written notice delivered to Landlord no later than
          September 30, 1998.

     Made as of the date first written above.

LANDLORD                                TENANT

CHEVRON U.S.A. INC.                     TEXAS MICRO-SYSTEMS, INC.

By       GARY SCHUMAN                   By       MICHAEL STEWART
  -----------------------------           --------------------------------

Its      Lease Manager                  Its      CEO
   ----------------------------            -------------------------------

                                       2
<PAGE>

                                                                       EXHIBIT A

                        [Map of Lower Level of Facility]

                                       3<PAGE>

                                  AMENDMENT TO
                 THE TITAN CORPORATION STOCK OPTION PLAN OF 1994

            The Titan Corporation Stock Option Plan of 1994 (the "Plan") is
hereby amended as set forth below.

1.    Section 13 of the Plan is hereby amended to read in its entirety as
      follows:

      Notwithstanding any other provisions of this Plan, upon any Change in
Control (as defined hereinbelow), all then outstanding options and Stock
Appreciation Rights (as defined hereinbelow) will become fully vested and
exercisable and all restricted stock (as defined hereinbelow) will become fully
vested and all restrictions against sale or transfer or hypothecation thereof
shall lapse and expire. The term "Change in Control" shall mean:

                  (a) The acquisition by any individual, entity or group (within
            the meaning of Section 13(d)(3) or 14(d)(2) of the Securities
            Exchange Act of 1934, as amended (the "Exchange Act")) (a "Person")
            of beneficial ownership (within the meaning of Rule 13d-3
            promulgated under the Exchange Act) of 20% or more of either (i) the
            then-outstanding shares of common stock of the Company (the
            "Outstanding Company Common Stock") or (ii) the combined voting
            power of the then-outstanding voting securities of the Company
            entitled to vote generally in the election of directors (the
            "Outstanding Company Voting Securities"); provided, however, that,
            for purposes of this clause (a), the following acquisitions shall
            not constitute a Change of Control: (A) any acquisition directly
            from the Company, (B) any acquisition by the Company, (C) any
            acquisition by any employee benefit plan (or related trust)
            sponsored or maintained by the Company or any affiliated company or
            (D) any acquisition by any corporation pursuant to a transaction
            that complies with subclauses (i), (ii) and (iii) of clause (c) of
            this definition;

                  (b) Individuals who, as of February 17, 2000, constitute the
            Board (the "Incumbent Board") cease for any reason to constitute at
            least a majority of the Board; provided, however, that any
            individual becoming a director subsequent to the date hereof whose
            election, or nomination for election by the Company's stockholders,
            was approved by a vote of at least a majority of the directors then
            comprising the Incumbent Board shall be considered as though such
            individual were a member of the Incumbent Board, but excluding, for
            this purpose, any such individual whose initial assumption of office
            occurs as a result of an actual or threatened election contest with
            respect to the election or removal of directors or other actual or
            threatened solicitation of proxies or consents by or on behalf of a
            Person other than the Board.

                  (c) Consummation of a reorganization, merger, consolidation or
            sale or other disposition of all or substantially all of the assets
            of the Company (a "Business Combination"), in each case, unless,
            following such Business Combination, (i) all or substantially all of
            the individuals and entities that were
<PAGE>

            the beneficial owners of the Outstanding Company Common Stock and
            the Outstanding Company Voting Securities immediately prior to such
            Business Combination beneficially own, directly or indirectly, more
            than 60% of the then-outstanding shares of common stock and the
            combined voting power of the then-outstanding voting securities
            entitled to vote generally in the election of directors, as the case
            may be, of the corporation resulting from such Business Combination
            (including, without limitation, a corporation that, as a result of
            such transaction, owns the Company or all or substantially all of
            the Company's assets either directly or through one or more
            subsidiaries) in substantially the same proportions as their
            ownership immediately prior to such Business Combination of the
            Outstanding Company Common Stock and the Outstanding Company Voting
            Securities, as the case may be, (ii) no Person (excluding any
            corporation resulting from such Business Combination or any employee
            benefit plan (or related trust) of the Company or such corporation
            resulting from such Business Combination) beneficially owns,
            directly or indirectly, 20% or more of, respectively, the
            then-outstanding shares of common stock of the corporation resulting
            from such Business Combination or the combined voting power of the
            then-outstanding voting securities of such corporation, except to
            the extent that such ownership existed prior to the Business
            Combination, and (iii) at least a majority of the members of the
            board of directors of the corporation resulting from such Business
            Combination were members of the Incumbent Board at the time of the
            execution of the initial agreement or of the action of the Board
            providing for such Business Combination; or

                  (d) Approval by the stockholders of the Company of a complete
            liquidation or dissolution of the Company.

2.    This amendment shall be effective as of February 17, 2000, with respect to
      all awards granted under the Plan, whether on, before or after such
      effective date; provided, that notwithstanding the foregoing, this
      amendment shall not be effective if and to the extent that it would cause
      a Change in Control transaction ineligible for pooling-of-interests
      accounting under APB No. 16 that is intended to be, and would but for the
      application of the foregoing be, eligible for such accounting treatment.

3.    The Plan is in all other respects ratified and confirmed without
      amendment.

                                      -2-

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00005-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00005-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00005-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00005-of-00352.parquet"}]]