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                                                                   EXHIBIT 10.26

                                PLEDGE AGREEMENT

THIS AGREEMENT is made on this 9th day of November 2000 by and between S3
Incorporated, a company incorporated in Delaware with its headquarters at 2841
Mission College Blvd., Santa Clara, California 95054 ("Pledgor"), and Chinatrust
Commercial Bank, a bank incorporated under the laws of the Republic of China
("ROC"), licensed to operate the banking business and having its principal place
of business at 3 Sung Shou Road, Taipei, Taiwan, R.O.C. ("Pledgee"), in its
capacity as the security agent acting for the interest of all banks ("Bank")
under the Credit Agreement (as defined below).

                                   WITNESSETH:

WHEREAS, the Pledgee (acting by and through its New York branch) together with
the other banks named therein have entered into a Credit Agreement dated 9
November 2000 with the Pledgor under which the Banks have agreed to extend a
loan in the aggregate principal amount of Seven Million United States Dollars
(US$70,000,000) (the "Credit Agreement") to the Pledgor on the condition, among
other things, that the Pledgor shall provide to the Pledgee and create a pledge
thereon (i) on the date hereof, 85,000,000 unrestricted common shares of the
Company (as defined below) owned by the Pledgor (the "Shares") with a Collateral
Value equivalent to at least 200% of the loan amount on the Initial Drawdown
Date and (ii) from time to time pursuant to Section 5(b) or 5(c) hereof,
additional Shares owned by the Pledgor (all such Shares pledged by the Pledgor
to the Pledgee hereunder the "Pledged Shares"), in each case, as a continuing
security to the Pledgee securing the due and punctual payment and performance by
the Pledgor of its obligations and liabilities under the Credit Agreement;

NOW, THEREFORE, in consideration of the foregoing and of the covenants and
agreements herein contained, the parties hereto agree as follows:

1.      DEFINITIONS

        In addition to the terms defined above and elsewhere herein as used in
        this Agreement, the following terms shall have their respective meanings
        as follows:

        "Company" means United Microelectronics Corp., a corporation duly
        organized

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        and validly existing under the laws of the ROC and having its principal
        place of business at 300 No.3, Li-hsin RD. II, Science-Based Industrial
        Park, Hsinchu, Taiwan, R.O.C.

        "Initial Drawdown Date" means 10 November 2000.

        "Collateral Value" means total value of the Pledged Shares calculated
        based on the closing price per Pledged Share as quoted on the Taiwan
        Stock Exchange, converted into U.S. Dollars at the Spot Rate.

        "Secured Obligations" means any and all liabilities and obligations of
        the Pledgor under the Credit Agreement, including, without limitation,
        the principal, interest, commissions, charges, fees and expenses payable
        under the Credit Agreement.

        "Spot Rate" means the amount of New Taiwan Dollars that may be purchased
        with one United States Dollar, as reported in The Asian Wall Street
        Journal for the date of such determination.

        "Taiwan Business Day" means any day that is a trading day of the Taiwan
        Stock Exchange.

        "TSCDC" means Taiwan Securities Central Depositary Corporation.

2.      INTERPRETATION

        (a) Singular, Plural and Gender

        Where applicable:

        (i)    words denoting the singular include the plural;

        (ii)   words denoting the plural include the singular; and

        (iii)  words denoting a gender include each gender.

        (b) Headings

        Headings in this Agreement are for convenience and identification of
        articles only and do not affect interpretation.

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3.    PLEDGE

        (a)    As a continuing security for the Secured Obligations, the Pledgor
               hereby pledges in favor of the Pledgee all of its rights, title
               and interests in and to (i) the Shares and (ii) any and all
               additional Shares of the Company that may be provided and pledged
               pursuant to Section 5(b) or 5(c) hereof, to constitute a valid
               and perfected pledge over the Pledged Shares.

        (b)    The Pledgee will, on the date hereof, create and register a
               pledge over the Shares through the book-entry system of TSCDC in
               favor of the Pledgee in accordance with the book-entry rules of
               TSCDC. It is hereby agreed upon by the parties hereto that the
               book entry regarding the pledge as contemplated hereby made by
               TSCDC as aforesaid shall replace the endorsement and delivery of
               physical share certificates evidencing the Shares.

        (c)    From time to time, the Pledgor shall do such things and execute
               such documents as the Pledgee may further request to effectuate a
               valid first priority pledge over the Pledged Shares, including,
               without limitation, notifying and registering the same with the
               Company.

4.      REPRESENTATION AND WARRANTIES OF PLEDGOR

        The Pledgor hereby represents and warrants as follows:

        (a)    the Pledgor legally and beneficially owns the Pledged Shares free
               and clear of any lien, charge or encumbrance of any kind, other
               than the pledge created under this Agreement;

        (b)    the execution, delivery and performance of this Agreement by the
               Pledgor will not contravene or violate any law, regulation,
               constitutive documents or agreement to which the Pledgor is
               subject or to which its property may be subject;

        (c)    the pledge created hereunder constitutes a valid and perfected
               first priority security interest over the Pledged Shares, legally
               binding and enforceable against the Pledgor; and

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        (d)    all governmental and other consents that are required to have
               been obtained by the Pledgor with respect to this Agreement and
               the grant of the pledge and security interest have been obtained
               and are in full force and effect and all conditions of any such
               consent have been complied with.

5.      UNDERTAKINGS

        (a)    The Pledgor undertakes that without the Pledgee's prior written
               consent, it shall not:

               (i)    sell, transfer, assign or otherwise dispose of or purport
                      to sell, transfer, assign or otherwise dispose of any of
                      the Pledged Shares; or

               (ii)   create or suffer to exist any mortgage, pledge, charge,
                      lien or other security interest over any of the Pledged
                      Shares.

        (b)    In the event the Pledgee determines and notifies the Pledgor that
               the Collateral Value at any time falls to 175% of the then total
               outstanding and unpaid principal amount of the loan extended
               under the Credit Agreement (the "Outstanding Amount"), as
               calculated and determined by the Pledgee in good faith, the
               Pledgor shall, within three (3) Taiwan Business Day following the
               date on which the Pledgee so notifies the Pledgor, provide
               additional Shares owned by the Pledgor to make up the shortage so
               that the Collateral Value shall reach 200% of the Outstanding
               Amount. The Pledgor shall create and register a pledge over the
               additional Shares being provided as Pledged Shares on such
               delivery date through the book-entry system of TSCDC.

               As an alternative, the Pledgor may partially prepay the
               Outstanding Amount (subject to the terms of the Credit Agreement)
               so as to reduce said amount to a level at which the Collateral
               Value is again 200% of the Outstanding Amount.

        (c)    In the event the Collateral Value falls to or below 130% of the
               Outstanding Amount, as calculated and determined by the Pledgee
               in good faith, the Pledgor shall, within one (1) Taiwan Business
               Day following the date on which the Collateral Value falls to or
               below 130% of the Outstanding

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               Amount, either provide additional Shares owned by the Pledgor to
               make up the shortage or, alternatively, partially prepay the
               Outstanding Amount so that the Collateral Value shall reach 200%
               of the Outstanding Amount. The Pledgor shall create and register
               a pledge over the additional Shares being provided as Pledged
               Shares on such delivery date through the book-entry system of
               TSCDC.

               As an alternative, the Pledgor may partially prepay the
               Outstanding Amount (subject to the terms of the Credit Agreement)
               so as to reduce said amount to a level at which the Collateral
               Value is again 200% of the Outstanding Amount.

        (d)    In the event the Pledgor fails to make up the shortage as
               specified in Section 5(b) or 5(c), the Pledgee shall be entitled
               to exercise its rights hereunder (including, without limitation,
               the right to sell the Pledged Shares pursuant to the terms hereof
               without notice.)

6.      DIVIDENDS AND PROFITS

        (a)    Profits, dividends and other distributions of income or capital
               in respect of the Pledged Shares distributed in cash by the
               Company shall be paid to the Pledgee, unless the Pledgee agrees
               otherwise.

        (b)    In the event the Collateral Value is less than 175% of the
               Outstanding Amount, the profits, dividends and other
               distributions of income or capital in respect of the Pledged
               Shares distributed in the form of shares of stock by the Company
               to the Pledgor shall become part of the Pledged Shares, and the
               Pledgor shall immediately create and register such pledge over
               such Pledged Shares through the book-entry system of TSCDC.

7.      DEFAULT

        The Pledgee shall immediately become entitled to enforce the pledge
        under this Agreement and shall be entitled to sell, realize or dispose
        of all or any of the Pledged Shares in such manner and for such
        consideration as permitted by law if:

        (a) the Pledgor commits any breach or makes any default in the
            observance of any term, condition, undertaking or covenant contained
            in this Agreement; or

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        (b) an Event of Default (as defined in the Credit Agreement) shall occur
            with respect to the Pledgor under the Credit Agreement.

8.      VOTING RIGHTS

        Upon the occurrence and during the continuance of an Event of Default
        under the Credit Agreement, the Pledgee shall, to the fullest extent
        permitted by law, be entitled to exercise all voting and other
        shareholder's rights in respect of the Pledged Shares and the Pledgor
        shall on demand execute and deliver to the Pledgee any document or
        instrument required to authorize and empower the Pledgee to do so.

9.      RELEASE OF SECURITY

        Upon the payment in full in cash of the Pledgor's obligations and
        liabilities under the Credit Agreement in accordance with the terms and
        conditions thereof, the Pledgee will, at the cost and expense of the
        Pledgor, release the Pledged Shares to the Pledgor and agrees to
        promptly execute and deliver all such documents as are necessary to
        effect such release.

10.     CONTINUING SECURITY

        Notwithstanding any intermediate payment or settlement of account or
        satisfaction of the whole or any part of the moneys secured by the
        pledge under this Agreement, the pledge created hereunder shall be a
        continuing security for the discharge of the Secured Obligations and
        shall extend to cover all or any sum or sums of money or obligations
        which shall from time to time be payable to the Pledgee by the Pledgor
        under the Credit Agreement.

11.     NOTICES

        (a)    Any notice, demand or communication from one party to another
               shall be made in writing and may be made by any authorized
               officer from time to time of the party giving, making or sending
               such notice, demand or communication. Any such notice, demand or
               communication shall become effective upon receipt.

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        (b)   Notices, demands and communications shall be sent to the
              following address of each party or any other address of such
              party as notified pursuant hereto:

              (i)    To the Pledgor

              Address: 2841 Mission College Blvd., Santa Clara, CA 95054
              Attn: Ronald R. Matsushima, Vice President & Corporate Treasurer
              Facsimile Number: 408/325-7877 or 408/325-7484
              Tel Number: 408/325-7899 or 408/588-8000
              Email: ronm@s3.com

              (ii)   To the Pledgee

              Address: 366 Madison Avenue, 3rd Floor, New York, NY 10017, U.S.A.
              Attn: Kenneth K. Foo, Assistant Vice President & Lending Officer
              Facsimile Number: (212) 457-6666
              Tel Number: (212) 457-8915
              Email: Kenneth.foo@ctcbny.com

12.     SEVERABILITY

        If any one or more of the provisions of this Agreement or any part
        thereof shall be declared or adjudged to be illegal, invalid or
        unenforceable under any applicable law, such illegality, invalidity or
        unenforceability shall not affect or invalidate any of the other
        provisions of this Agreement.

13.     GOVERNING LAW

        This Agreement shall be governed by and construed in accordance with the
        laws of the ROC.

14.     JURISDICTION

        In case of disputes arising from or in connection with this Agreement,
        the parties hereto agree to submit to the non-exclusive jurisdiction of
        the Taipei District Court.

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15.     ENGLISH LANGUAGE

        (a)    This Agreement is made in English only.

        (b)    No translation of this Agreement into Chinese or any other
               language shall be of any force or effect and shall be for
               convenience only.

16.     AMENDMENT

        This Agreement may be amended only by written agreement signed by the
        parties hereto.

17.     COUNTERPARTS

        This Agreement may be executed in any number of counterparts, all of
        which together shall constitute one original instrument.

IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement as of
the date and year first written above.

Pledgee:                                       Pledgor:

Chinatrust Commercial Bank                     S3 Incorporated

By /s/ Kenneth K. Foo                          By /s/ Ronald R. Matsushima
   --------------------------------               ------------------------------
   Name:   Kenneth K. Foo                         Name:   Ronald R. Matsushima
   Title:  Assistant Vice President               Title:  Vice President and
           and Lending Officer                            Corporate Treasurer

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                                                                    Exhibit 10.1

                                 FIRST AMENDMENT
                           DATED AS OF MARCH 30, 2001
                                       TO
                         RECEIVABLES PURCHASE AGREEMENT
                           DATED AS OF OCTOBER 1, 1999

         THIS FIRST AMENDMENT (the "Amendment"), dated as of March 30, 2001 is
entered into among Ametek, Inc. ("Ametek"), Rotron Incorporated ("Rotron") (each
of Ametek and Rotron being referred to individually, as an "Originator" and
collectively, as the "Originators") and Ametek Receivables Corp. (the
"Company").

                                   WITNESSETH:

         WHEREAS, the Originators and the Company have heretofore executed and
delivered a Receivables Purchase Agreement, dated as of October 1, 1999 (as
amended, supplemented or otherwise modified through the date hereof, the
"Purchase Agreement"), and

         WHEREAS, the parties hereto desire to amend the Purchase Agreement as
provided herein.

         NOW, THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereto hereby agree that
the Purchase Agreement shall be and is hereby amended as follows:

         Section 1. The defined term "Divisions" appearing in Schedule I to the
Purchase Agreement is hereby amended in its entirety and as so amended shall
read as follows:

                           "Divisions" means the following divisions of Ametek:
                  Ametek Aerospace, Lamb Electric, Rotron Technical Motor
                  Division, Specialty Metal Products, U.S. Gauge, Process &
                  Analytical Instruments and Test & Calibration Instruments.

         Section 2. This Amendment shall become effective on the date the Agent
has received counterparts hereof executed by each Originator and the Company.

         Section 3. This Amendment may be executed in any number of counterparts
and by the different parties on separate counterparts and each such counterpart
shall be deemed to be an original, but all such counterparts shall together
constitute but one and the same Amendment.

         Section 4. Except as specifically provided above, the Purchase
Agreement and the other Transaction Documents shall remain in full force and
effect and are hereby ratified and confirmed in all respects. All defined terms
used herein and not defined herein shall have the same meaning herein as in the
Transaction Documents. The Company agrees to pay on demand all costs and
expenses (including reasonable fees and expenses of counsel) of or incurred by
the Agent and the Originators in connection with the negotiation, preparation,
execution and delivery of this Amendment.
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         Section 5. This Amendment and the rights and obligations of the parties
hereunder shall be construed in accordance with and be governed by the law of
the State of New York.

         IN WITNESS WHEREOF, the parties have caused this Amendment to be
executed and delivered by their duly authorized officers as of the date first
above written.

                                          AMETEK, INC.

                                          By: /s/ Deirdre Saunders
                                             ----------------------------------
                                             Title: Vice President & Treasurer
                                                   ----------------------------

                                          ROTRON INCORPORATED

                                          By: /s/ Deirdre Saunders
                                             ----------------------------------
                                             Title: Treasurer
                                                   ----------------------------

                                          AMETEK RECEIVABLES CORP.

                                          By: /s/ Deirdre Saunders
                                             ----------------------------------
                                             Title: Treasurer
                                                   ----------------------------

                                      -2-

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