Document:

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                                                                   Exhibit 10.28

                              COMMISSION AGREEMENT

PARTIES:  GARDEX INTERNATIONAL LIMITED ("GARDEX")
          (a British Virgin Islands Corporation)
          ASE (Korea) Inc. ("ASEKR")
          (a Korea Corporation)

DATE:      August 1, 2001

                                   AGREEMENT

1.   SERVICES TO BE RENDERED.  ASEKR hereby retains GARDEX to provide the sales
     services to ASEKR as a Sales Agency with the following terms.

     To be non-exclusive world-wide sales agent for all present and future
     products and services to be specified by ASEKR in writing with the
     following authority:

(a) Identify customers for ASEKR products and services;

(b) Within such limitations relating to price, delivery and other key terms as
    ASEKR may from time to time specify in writing, and subject to acceptance by
    ASEKR (by telex or otherwise) negotiate sales contracts as ASEKR's agent;

(c) Monitor contract performance by the customer, including acceptance of
    delivery, payment, etc.

2.   COMPENSATION TO GARDEX.  For services hereundered, ASEKR shall pay monthly
     compensation to GARDEX in respect of net export sales (outside of Korea).
     The compensation amount is 0.48% of the total monthly export sales.

     The above scheme of compensation payment is applicable from August 1, 2001
to July 31, 2002. Compensation payment thereafter is subject to further
negotiation on a yearly basis between ASEKR and GARDEX.

     All payments to GARDEX shall be in US dollars. Currency conversions, where
necessary, shall be based on prevailing free-market rates of the time the
payment is earned (not at the time of payment) as quoted in the Wall Street
Journal or other authoritative source.

3.   TERM OF AGREEMENT.  This agreement is effective from August 1, 2001 and
     shall expire on July 31, 2002 unless earlier terminated by (i) mutual
     agreement, or (ii) ASEKR on at least 30 days' prior written notice with or
     without cause. Neither expiration nor termination of this Agreement shall
     terminate the obligation of ASEKR to pay GARDEX for services rendered with
     respect to sales following such date that result from orders received prior
     to such date.

4.   REPRESENTATIVE AND COVENANTS

(a) GARDEX agree to use its best efforts to perform its obligations hereunder
    and to give priority to ASEKR over all other customers of GARDEX in terms of
    management time, and efforts. GARDEX will not enter into any management
    consulting, sales, agency or similar relationship, nor engage in activities,
    that would result in a conflict with GARDEX's duties under this Agreement.

(b) Each party will provide to the other on a regular basis such documentation
    as may reasonably be required to enable the other party to be assured of
    compliance with this Agreement, and shall permit the other party to inspect
    its books of account and other records at such a reasonable times as the
    other party may request.
<PAGE>

(c) All confidential information received or learned by GARDEX relating to
    ASEKR's business and products shall be kept in confidence by GARDEX and
    neither used by GARDEX nor disclosed to any other person for any purpose
    outside this Agreement.

5.   GOVERNING LAW AND JURISDICTION.  This Agreement shall be governed and
     construed under the laws of Republic of China unless the parties agree in
     writing to voluntary arbitration. The Courts in the Republic of China shall
     have exclusive jurisdiction to hear and decide any case or controversy
     arising out of this Agreement.

     Each party consents to in person jurisdiction over it by such courts and to
service of process by registered mail sent to its principal business address.

                                          ASE (Korea) Inc.

                                          By:       /s/ JIM STILSON
                                            ------------------------------------

                                          GARDEX INTERNATIONAL LIMITED

                                          By:     /s/ PHILIP NICHOLLS
                                            ------------------------------------<PAGE>
                                                                   Exhibit 10.29

                              COMMISSION AGREEMENT

PARTIES:  GARDEX INTERNATIONAL LIMITED ("GARDEX")
          (a British Virgin Islands Corporation)

          ASE (Chung-Li) Inc. ("ASECL")
          (a Taiwan Corporation)

DATE:      August 1, 2001

                                   AGREEMENT

1.   SERVICES TO BE RENDERED.  ASECL hereby retains GARDEX to provide the sales
     services to ASECL as a Sales Agency with the following terms.

     To be non-exclusive world-wide sales agent for all present and future
     products and services to be specified by ASECL in writing with the
     following authority:

(a) Identify customers for ASECL products and services;

(b) Within such limitations relating to price, delivery and other key terms as
    ASECL may from time to time specify in writing, and subject to acceptance by
    ASECL (by telex or otherwise) negotiate sales contracts as ASECL's agent;

(c) Monitor contract performance by the customer, including acceptance of
    delivery, payment, etc.

2.   COMPENSATION TO GARDEX.  For services hereundered, ASECL shall pay monthly
     compensation to GARDEX in respect of net export sales (outside of Taiwan),
     the compensation amount is 0.56% of the total monthly export sales.

    The above scheme of compensation payment is applicable from August 1, 2001
    to July 31, 2002. Compensation payment thereafter is subject to further
    negotiation on a yearly basis between ASECL and GARDEX.

    All payments to GARDEX shall be in US dollars. Currency conversions, where
    necessary, shall be based on prevailing free-market rates of the time the
    payment is earned (not at the time of payment) as quoted in the Wall Street
    Journal or other authoritative source.

3.   TERM OF AGREEMENT.  This agreement is effective from August 1, 2001 and
     shall expire on July 31, 2002 unless earlier terminated by (i) mutual
     agreement, or (ii) ASECL on at least 30 days' prior written notice with or
     without cause. Neither expiration nor termination of this Agreement shall
     terminate the obligation of ASECL to pay GARDEX for services rendered with
     respect to sales following such date that result from orders received prior
     to such date.

4.   REPRESENTATIVE AND COVENANTS

(a) GARDEX agree to use its best efforts to perform its obligations hereunder
    and to give priority to ASECL over all other customers of GARDEX in terms of
    management time, and efforts. GARDEX will not enter into any management
    consulting, sales, agency or similar relationship, nor engage in activities,
    that would result in a conflict with GARDEX's duties under this Agreement.

(b) Each party will provide to the other on a regular basis such documentation
    as may reasonably be required to enable the other party to be assumed of
    compliance with this Agreement, and shall permit the other party to inspect
    its books of account and other records at such a reasonable times as the
    other party may request.

(c) All confidential information received or learned by GARDEX relating to
    ASECL's business and products shall be kept in confidence by GARDEX and
    neither used by GARDEX nor disclosed to any other person for any purpose
    outside this Agreement.
<PAGE>

5.   GOVERNING LAW AND JURISDICTION.  This Agreement shall be governed and
     construed under the laws of Republic of China unless the parties agree in
     writing to voluntary arbitration. The Courts in the Republic of China shall
     have exclusive jurisdiction to hear and decide any case or controversy
     arising out of this Agreement.

     Each party consents to in person jurisdiction over it by such courts and to
service of process by registered mail sent to its principal business address.

                                          ASE (Chung-Li) Inc.

                                          By:        /s/ S. S. LEE
                                            ------------------------------------

                                          GARDEX INTERNATIONAL LIMITED

                                          By:     /s/ PHILIP NICHOLLS
                                            ------------------------------------<PAGE>
                                                                   Exhibit 10.30

                              COMMISSION AGREEMENT

PARTIES:  GARDEX INTERNATIONAL LIMITED ("GARDEX")
          (a British Virgin Islands Corporation)
          ADVANCED SEMICONDUCTOR ENGINEERING, INC. ("ASE")
          (a Taiwan Corporation)

DATE:      August 1, 2001

                                   AGREEMENT

1.   SERVICES TO BE RENDERED.  ASE hereby retains GARDEX to provide the sales
     services to ASE as a Sales Agency with the following terms.

     To be non-exclusive world-wide sales agent for all present and future
products and services to be specified by ASE in writing with the following
authority:

(a) Identify customers for ASE products and services;

(b) Within such limitations relating to price, delivery and other key terms as
    ASE may from time to time specify in writing, and subject to acceptance by
    ASE (by telex or otherwise) negotiate sales contracts as ASE's agent;

(c) Monitor contract performance by the customer, including acceptance of
    delivery, payment, etc.

2.   COMPENSATION TO GARDEX.  For services hereundered, ASE shall pay monthly
     compensation to GARDEX in respect of net export sales (outside of Taiwan).
     The compensation amount is 0.8% of the total monthly export sales.

     The above scheme of compensation payment is applicable from August 1, 2001
to July 31, 2002. Compensation payment thereafter is subject to further
negotiation on a yearly basis between ASE and GARDEX.

     All payments to GARDEX shall be in US dollars. Currency conversions, where
necessary, shall be based on prevailing free-market rates of the time the
payment is earned (not at the time of payment) as quoted in the Wall Street
Journal or other authoritative source.

3.   TERM OF AGREEMENT.  This agreement is effective from August 1, 2001 and
     shall expire on July 31, 2002 unless earlier terminated by (i) mutual
     agreement, or (ii) ASE on at least 30 days' prior written notice with or
     without cause. Neither expiration nor termination of this Agreement shall
     terminate the obligation of ASE to pay GARDEX for services rendered with
     respect to sales following such date that result from orders received prior
     to such date.

4.   REPRESENTATIVE AND COVENANTS

(a) GARDEX agree to use its best efforts to perform its obligations hereunder
    and give priority to ASE over all other customers of GARDEX in terms of
    management time, and efforts. GARDEX will not enter into any management
    consulting, sales, agency or similar relationship, nor engage in activities,
    that would result in a conflict with GARDEX's duties under this Agreement.

(b) Each party will provide to the other on a regular basis such documentation
    as may reasonably be required to enable the other party to be assured of
    compliance with this Agreement, and shall permit the other party to inspect
    its books of account and other records at such a reasonable times as the
    other party may request.
<PAGE>

(c) All confidential information received or learned by GARDEX relating to ASE's
    business and products shall be kept in confidence by GARDEX and neither used
    by GARDEX nor disclosed to any other person for any purpose outside this
    Agreement.

5.   GOVERNING LAW AND JURISDICTION.  This Agreement shall be governed and
     construed under the laws of Republic of China unless the parties agree in
     writing to voluntary arbitration. The Courts in the Republic of China shall
     have exclusive jurisdiction to hear and decide any case or controversy
     arising out of this Agreement.

     Each party consents to in person jurisdiction over it by such courts and to
service of process by registered mail sent to its principal business address.

                                          ASE Inc.

                                          By:        /s/ K. J. CHIN
                                            ------------------------------------

                                          GARDEX INTERNATIONAL LIMITED

                                          By:     /s/ PHILIP NICHOLLS
                                            ------------------------------------

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