Document:

Exhibit 4(z)

                               SERVICE AGREEMENT

PARTIES:                   ASE (U.S.) INC. ("ASE US")
                           (a California corporation)

                           ADVANCED SEMICONDUCTOR ENGINEERING, INC. ("ASE")
                           (a Taiwan Corporation)

DATE:    July 1st, 2000

ASE hereby retains ASE US to be its Service Agent to provide after sales
service and sales support ("Services") to its Europe and North America
customers ("Customers") for present and future products and services as
specified by ASE as follows

1.   Service to rendered

(a)  To facilitate market information collection, Customer and business
     identification, and Customer inquiry dissemination, and;

(b)  To liaise with ASE and Customers re price, delivery and other key terms of
     the sales contract as ASE may from time to time specify in writing, and;

(c)  To monitor sales contract performance by the Customers, including
     acceptance of delivery, payments, etc., and;

(d)  To provide after sales services including problem solving, capacity
     planning coordination and other items as may be necessary.

2.   Compensation to ASE US

For services hereunder, ASE will monthly compensate ASE US as follows:

(a)  50% of ASE US's monthly incurred services associated cost and expenses
     (excluding bonus) plus 10%.

(b)  Upon payment request, ASE US is to submit detailed monthly expense report
     certified by its Financial Manager for accuracy, and;

(c)  The compensation agreement is valid for one year and is subject to annual
     revision accepted by both parties.

3.   Compensation from ASE US

ASE US agrees to pay a reasonable portion of ASE employee's traveling expenses
incurred in the United States or Europe, when the trip is deemed necessary by
ASE to assist ASE US in providing its services hereunder.

4.   Term of Agreement

This Agreement is effective from July 1, 2000 and shall expire on June 30,
2001, unless earlier terminated by (i) mutual agreement or (ii) ASE on at least
30 days' prior written notice with or without causes.

5.   Representations and Covenants

(a)  ASE US agrees to perform its obligations hereunder to the extent
     permissible by law and the sales contracts between ASE and the Customers.

<PAGE>

     ASE US will not enter into any contract or agreement, nor engage in any
     activities, that would result in a conflict with ASE US's duties under
     this Agreement.

     With the terms of this agreement, ASE US shall not have the authority to
     make any commitments whatsoever on behalf of ASE, as agent or otherwise,
     or to bind ASE in any respect.

(b)  Each party will provide to the other on a regular basis such information
     as may be required to enable the other party to be assured of compliance
     with this Agreement.

(c)  Unless required by laws, all confidential information received or learned
     by ASE US relating to ASE or its business and products shall be kept in
     confidence by ASE US and neither used by ASE US nor disclosed to others
     for any purpose inconsistent with this Agreement.

(d)  ASE US shall use ASE trademark only as ASE may authorize from time to
     time, and ASE US shall not claim any proprietary right to or interest in
     such trademarks.

6.   Miscellaneous

This Agreement shall be governed by the laws of the Republic of China ("ROC").
In case of any disputes arising from or in connection with this Agreement, the
parties hereto consent to submit to the non-exclusive jurisdiction of the
Taipei District Court.

Without the prior written consent of ASE, ASE US shall not assign or transfer
any of its rights or obligations hereunder to any other person.

This Agreement can be amended or modified only in writing signed by the parties
hereto. Any communication or notice made hereunder shall be in writing and sent
by way of (i) hand delivery, (ii) postage prepaid registered air mail, or (iii)
facsimile to the address as follows:

ASE US:                                     ASE Inc.:
Address:                                    Address:
2880 Zanker Road, Suite 106,                26,Chin 3rd Rd Nantze EPZ,
San Jose, CA  95134, USA                    Kaohsiung, Taiwan, R.O.C.

Telefax No:  408-432-0440                   Telefax No:  886-7-361-3094

The notice or communication shall become effective (i) upon delivery if sent by
hand delivery, (ii) upon the dispatch if sent by facsimile and confirmed by
writing and (iii) upon the fifth days later than the post date if sent by air
mail.

This Agreement shall in no event be construed to establish a sales agency
relationship between ASE and ASE US.

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

ASE Inc.                                     ASE US

By /s/ K. J. Chin                            By /s/ Y. C. Hsu
  -----------------------------                --------------------------
Name:  K.J. Chin                               Name:  Y. C. Hsu
Title: General Manager/EVP                     Title: General ManagerExhibit 4(aa)

                              COMMISSION AGREEMENT

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

                           ASE Electronics (M) Sdn. Bhd. ("ASEM")
                           (a Malaysia Corporation)

DATE:    July 1, 2000

                                   AGREEMENT

1.   Services to be rendered. ASEM hereby retains GARDEX to provide the sales
     services to ASEM 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 ASEM in writing with the
     following authority:

(a)  Identify customers for ASEM products and services;

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

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

2.   Compensation to GARDEX. For services hereundered, ASEM shall pay monthly
     compensation to GARDEX in respect of net export sales (outside of
     Malaysia). The compensation amount is 0.7% of the total monthly export
     sales.

     The above scheme of compensation payment is applicable from July 1, 2000
     to June 30, 2001. Compensation payment thereafter is subject to further
     negotiation on a yearly basis between ASEM 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 July 1, 2000 and shall
     expire on June 30, 2001 unless earlier terminated by (i) mutual agreement,
     or (ii) ASEM on at least 30 days' prior written notice with or without
     cause. Neither expiration nor termination of this Agreement shall
     terminate the obligation of ASEM 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 ASEM 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 reasonable times as
     the other party may request.

<PAGE>

(c)  All confidential information received or learned by GARDEX relating to
     ASEM'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 Electronics (M) Sdn. Bhd.

                                           By: /s/ David Hsiang
                                              --------------------------------

                                           GARDEX INTERNATIONAL LIMITED

                                           By /s/ Philip Nicholls
                                              --------------------------------Exhibit 4(bb)

                              COMMISSION AGREEMENT

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

                           ASE Test Inc. ("ASE Test")
                           (a Taiwan Corporation)

DATE:    July 1, 2000

                                   AGREEMENT

1.   Services to be rendered. ASE Test hereby retains GARDEX to provide the
     sales services to ASE Test 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 Test in writing with the
     following authority:

     (a)  Identify customers for ASE Test products and services;

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

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

2.   Compensation to GARDEX. For services hereundered, ASE Test shall pay
     monthly compensation to GARDEX in respect of net export sales (outside of
     Taiwan), the compensation amount is 0.7% of the total monthly export
     sales.

     The above scheme of compensation payment is applicable from July 1, 2000
     to June 30, 2001. Compensation payment thereafter is subject to further
     negotiation on a yearly basis between ASE Test 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 July 1, 2000 and shall
     expire on June 30, 2001 unless earlier terminated by (i) mutual agreement,
     or (ii) ASE Test 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 Test 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 ASE Test 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
          reasonable times as the other party may request.

<PAGE>

     (c)  All confidential information received or learned by GARDEX relating
          to ASE Test'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 Test Inc.

                                             By /s/ Raymond Lo
                                               -------------------------------

                                             GARDEX INTERNATIONAL LIMITED

                                             By /s/ Philip Nicholls
                                               -------------------------------

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