Document:

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                                                              EXHIBIT 10(iii)(L)

                           DALLAS SEMICONDUCTOR CORPORATION

                                  AMENDMENT TO
                       AGREEMENT, DATED MAY 20, 1999, WITH
                                   CHAO C. MAI

                  RESOLVED, that, a "Change in Control" as defined in Section
         1.3 thereof having not occurred, the May 1999 Agreement between the
         Corporation and Mr. Chao C. Mai, be, and the same hereby is, amended,
         pursuant to Section 6.1 thereof, effective immediately, by: (i) the
         insertion of the word "or" immediately preceding clause (iv) in Section
         1.3 and the deletion of clause (v) of Section 1.3; (ii) the insertion
         of the words "after a Change in Control" between the words "die" and
         "prior" in the first line of Section 5.1; and (iii) the deletion of the
         last sentence of Section 7.9; and, further, by the adoption of this
         resolution, said amendments shall have the same force and effect as if
         set forth in a separately executed amendment to said May 1999
         Agreement.

<PAGE>   2

                                  AMENDMENT TO
                       AGREEMENT, DATED MAY 20, 1999, WITH
                                MICHAEL L. BOLAN

                  RESOLVED, that, a "Change in Control" as defined in Section
         1.3 thereof having not occurred, the May 1999 Agreement between the
         Corporation and Mr. Michael L. Bolan, be, and the same hereby is,
         amended, pursuant to Section 6.1 thereof, effective immediately, by:
         (i) the insertion of the word "or" immediately preceding clause (iv) in
         Section 1.3 and the deletion of clause (v) of Section 1.3; (ii) the
         insertion of the words "after a Change in Control" between the words
         "die" and "prior" in the first line of Section 5.1; and (iii) the
         deletion of the last sentence of Section 7.9; and, further, by the
         adoption of this resolution, said amendments shall have the same force
         and effect as if set forth in a separately executed amendment to said
         May 1999 Agreement.

<PAGE>   3

                                  AMENDMENT TO
                       AGREEMENT, DATED MAY 20, 1999, WITH
                                  ALAN P. HALE

                  RESOLVED, that, a "Change in Control" as defined in Section
         1.3 thereof having not occurred, the May 1999 Agreement between the
         Corporation and Mr. Alan P. Hale, be, and the same hereby is, amended,
         pursuant to Section 6.1 thereof, effective immediately, by: (i) the
         insertion of the word "or" immediately preceding clause (iv) in Section
         1.3 and the deletion of clause (v) of Section 1.3; (ii) the insertion
         of the words "after a Change in Control" between the words "die" and
         "prior" in the first line of Section 5.1; and (iii) the deletion of the
         last sentence of Section 7.9; and, further, by the adoption of this
         resolution, said amendments shall have the same force and effect as if
         set forth in a separately executed amendment to said May 1999
         Agreement.

<PAGE>   4

                             SECRETARY'S CERTIFICATE

         I, Marla K. Suggs, Corporate Secretary of Dallas Semiconductor
Corporation, a Delaware corporation, do hereby certify that the attached
resolutions were duly adopted by the Board of Directors of the Corporation, at a
meeting duly called and held on November 18, 2000, at which a quorum was present
and voting throughout, and that said resolutions are still in full force and
effect and have not in anywise been amended, modified or rescinded:

         IN WITNESS WHEREOF, I have hereunto set my hand and seal of office on
this, the 5th day of February, 2001.

                                      /s/ Marla K. Suggs
                                      ------------------------------------------
                                      Marla K. Suggs
                                      Corporate Secretary<PAGE>   1
                                                              EXHIBIT 10(iii)(M)

                        DALLAS SEMICONDUCTOR CORPORATION

                                  AMENDMENT TO
                       AGREEMENT, DATED MAY 20, 1999, WITH
                                   CHAO C. MAI

                  RESOLVED, that, a "Change in Control" as defined in Section
         1.3 thereof having not occurred, the May 1999 Agreement between the
         Corporation and Mr. Chao C. Mai, as heretofore amended on November 18,
         2000, be and the same hereby is, further amended, pursuant to Section
         6.1 thereof, effective immediately, by deleting Section 3.2 thereof in
         its entirety; and, further, by the adoption of this resolution, said
         amendment shall have the same force and effect as if set forth in a
         separately executed amendment to said May 1999 Agreement.

<PAGE>   2

                                  AMENDMENT TO
                       AGREEMENT, DATED MAY 20, 1999, WITH
                                MICHAEL L. BOLAN

                  RESOLVED, that, a "Change in Control" as defined in Section
         1.3 thereof having not occurred, the May 1999 Agreement between the
         Corporation and Mr. Michael L. Bolan, as heretofore amended on November
         18, 2000, be and the same hereby is, further amended, pursuant to
         Section 6.1 thereof, effective immediately, by deleting Section 3.2
         thereof in its entirety; and, further, by the adoption of this
         resolution, said amendment shall have the same force and effect as if
         set forth in a separately executed amendment to said May 1999
         Agreement.

<PAGE>   3

                                  AMENDMENT TO
                       AGREEMENT, DATED MAY 20, 1999, WITH
                                  ALAN P. HALE

                  RESOLVED, that, a "Change in Control" as defined in Section
         1.3 thereof having not occurred, the May 1999 Agreement between the
         Corporation and Mr. Alan P. Hale, as heretofore amended on November 18,
         2000, be and the same hereby is, further amended, pursuant to Section
         6.1 thereof, effective immediately, by deleting Section 3.2 thereof in
         its entirety; and, further, by the adoption of this resolution, said
         amendment shall have the same force and effect as if set forth in a
         separately executed amendment to said May 1999 Agreement.
<PAGE>   4

                             SECRETARY'S CERTIFICATE

         I, Marla K. Suggs, Corporate Secretary of Dallas Semiconductor
Corporation, a Delaware corporation, do hereby certify that the attached
resolutions were duly adopted by the Board of Directors of the Corporation, at a
meeting duly called and held on January 28, 2001, at which a quorum was present
and voting throughout, and that said resolutions are still in full force and
effect and have not in anywise been amended, modified or rescinded:

         IN WITNESS WHEREOF, I have hereunto set my hand and seal of office on
this, the 5th day of February, 2001.

                                      /s/ Marla K. Suggs
                                      ------------------------------------------
                                      Marla K. Suggs
                                      Corporate Secretary<PAGE>   1
                                  EXHIBIT 10.13

                   SCHEDULE OF MANAGEMENT STABILITY AGREEMENTS

EMPLOYEE                                                       DATE OF AGREEMENT
--------                                                       -----------------

Keith D. Booke                                                    August 1, 1997
S. Eugene Edwards                                              February 25, 1999
John D. Gibbons                                                   August 1, 1997
John F. Hohnholt                                               February 25, 1999
Gregory C. King                                                   August 1, 1997<PAGE>   1
                                  EXHIBIT 10.15

                        EXTENSION OF EMPLOYMENT AGREEMENT

         THIS EXTENSION OF EMPLOYMENT AGREEMENT is between William E. Greehey, a
resident of San Antonio, Texas ("Mr. Greehey"), and Valero Energy Corporation, a
Delaware corporation ("Valero"), and is made and delivered effective as of the
30th day of January 2001 ("Effective Date"). Valero and Mr. Greehey are
sometimes referred to herein individually as a "Party," and collectively as the
"Parties."

         WHEREAS, Mr. Greehey and Valero entered into that certain Employment
Agreement dated March 25, 1999 (the "Employment Agreement") (capitalized terms
not defined herein shall have the respective meanings ascribed to such terms in
the Employment Agreement);

         WHEREAS, paragraph two of the Employment Agreement provides that (i)
the Initial Period of the Employment Agreement shall expire on July 31, 2001,
(ii) if Mr. Greehey notifies Valero at least ninety (90) calendar days prior to
the end of the Initial Period of his intention to extend the Employment
Agreement, then the Agreement shall be extended on a month-to-month basis
("Extension Period"), and (iii) that Mr. Greehey may terminate the Employment
Agreement within the Extension Period by giving Valero ninety (90) calendar days
written notice of termination;

         NOW THEREFORE, the parties hereto agree that by signing below, Mr.
Greehey is hereby delivering notice to Valero of his intention to extend the
Employment Agreement, and that the term of the Employment Agreement is hereby
extended beyond the end of the Initial Period on a month-to-month basis in
accordance with paragraph two of the Employment Agreement.

         IN WITNESS WHEREOF, the Parties have executed this Extension of
Employment Agreement as of the Effective Date.

/s/ William E. Greehey
WILLIAM E. GREEHEY

VALERO ENERGY CORPORATION
By: /s/ Keith D. Booke
Keith D. Booke, Executive Vice President and Chief Administrative Officer

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