Document:

<PAGE>   1
                                                          CONFIDENTIAL TREATMENT
                                                                 REQUESTED

                                                                   EXHIBIT 10.16

                                ATTACHMENT NO. 5

This Attachment No. 5 is an attachment to Amendment No.2 to the Software License
Agreement between Palm, Inc. (formerly Palm Computing, Inc., a subsidiary of
3Com Corporation) and Handspring, Inc.

1.   [*]

     [*]

     AMENDMENT TO AMENDMENT NO.2: For purposes of Section 2 of this Attachment
No.5 only, Section 3 of Amendment No.2 is deleted in its entirety with respect
to Modifications made by Licensee pursuant to Section 2 of this Attachment No.5
and replaced with the following:

          "3Com shall be the sole and exclusive owner of the Modifications and
          Licensee hereby assigns to 3Com all of its right, title and interest
          in and to the Modifications. Licensee agrees to provide 3Com, upon
          3Com's request, copies of all Modifications. Subject to 3Com's rights
          in the underlying Palm Source Code, 3Com hereby grants to Licensee a
          worldwide, nonexclusive, fully paid, royalty free, perpetual and
          irrevocable license to use, reproduce, modify, display and distribute
          the Modifications in source code and/or executable form, including the
          right to sublicense such rights through single or multiple tiers of
          distribution."

     ADDITIONAL TERMS: For purposes of Section 2 of this Attachment No. 5 only,
Licensee agrees to the following additional terms with respect to Modifications
made by Licensee pursuant to Section 2 of this Attachment No. 5:

     a)   Licensee agrees that the Modifications shall be made in accordance
          with Licensee's [*] that has been approved by 3Com
     b)   Licensee agrees that 3Com shall be permitted to perform code reviews
          of the Modifications
     c)   Licensee shall provide 3Com engineers reasonable opportunity to meet
          with the Licensee engineers that developed the Modifications to
          discuss any issues with the Modifications

      *   Confidential treatment has been requested for certain portions of
          this document pursuant to an application for confidential treatment
          sent to the Securities and Exchange Commission. Such portions are
          omitted from this filing and filed separately with the Securities and
          Exchange Commission.

<PAGE>   2

Except as modified by this Attachment No.5 with respect to this Attachment No.5,
Amendment No.2 shall remain in full force and effect.

<TABLE>
<S>                                     <C>
PALM, INC.                              HANDSPRING, INC.

By: /s/ MARK BERCOW                     By: /s/ DONNA DUBINSKY
    --------------------------              -----------------------
Name: Mark Bercow                       Name: Donna Dubinsky
Title: VP, Strategic Alliances          Title: CEO
       & Platform
Date: 4/27/00                           Date: 4/17/00
</TABLE>

                                       2
<PAGE>   3
                                ATTACHMENT NO. 6

This Attachment No.6 is an attachment to Amendment No.2 to the Software License
Agreement between Palm, Inc. (formerly Palm Computing, Inc., a subsidiary of
3Com Corporation) and Handspring, Inc.

1. [*]

   [*]

<TABLE>
<S>                                     <C>
PALM, INC.                              HANDSPRING, INC.

By: /s/ MARK BERCOW                     By: /s/ DONNA DUBINSKY
    --------------------------              -----------------------
Name: Mark Bercow                       Name: Donna Dubinsky
Title: VP, Strategic Alliances          Title: CEO
       & Platform
Date: 4/27/00                           Date: 4/19/00
</TABLE>

* Confidential treatment has been requested for certain portions of this
  document pursuant to an application for confidential treatment sent to the
  Securities and Exchange Commission. Such portions are omitted from this filing
  and filed separately with the Securities and Exchange Commission.

                                       3
<PAGE>   4

                                 AMENDMENT NO. 5
                                       TO
                           SOFTWARE LICENSE AGREEMENT

     This Amendment No. 5 ("Amendment") is entered into by and between Palm,
Inc. ("Palm"), a Delaware corporation with a place of business at 5470 Great
America Parkway, Santa Clara, California 95052, and Handspring, Inc.
("Licensee"), a California corporation with a place of business at 189 Bernardo
Avenue, Mountain View, California 94043. The effective date of this Amendment
shall be 4/17, 2000 ("Effective Date").

                                    RECITALS

     A.   Effective as of September 24, 1998, Palm and Licensee entered into a
Software License Agreement, as amended ("License Agreement"; capitalized terms
used herein and not defined shall have the meanings set forth in the License
Agreement) with regard to Licensee's developing, manufacturing and marketing
handheld computing products incorporating specified Palm software and technology
related to the Palm OS platform.

     B.   Since the effective date of the License Agreement, Palm Computing,
Inc. changed its name to Palm, Inc. and reincorporated in Delaware.

     C.   The parties desire to amend the License Agreement as set forth in this
Amendment.

The parties hereby amend the License Agreement as follows:

1.   REFERENCES. All references in the Agreement to "3Com" shall be changed to
"Palm."

2.   PALM DESKTOP SOFTWARE. In Exhibit A the Section titled [*] is deleted in
     its entirety and replaced with the following:

     [*]

3.   UPGRADE. Licensee acknowledges that Palm has provided Licensee with the
"Mandalay" version of the Palm Software (version 3.5), a description of which is
attached hereto as Exhibit A-1.

4.   DESKTOP SITE LICENSE. The following is added as a new Section 2.11 to the
License Agreement:

* Confidential treatment has been requested for certain portions of this
  document pursuant to an application for confidential treatment sent to the
  Securities and Exchange Commission. Such portions are omitted from this filing
  and filed separately with the Securities and Exchange Commission.

                                       4
<PAGE>   5
     "2.11 Subject to the terms and conditions of this Agreement, Palm hereby
grants to Licensee a limited, non-exclusive, non-transferable (except as
provided in Section 17.9), worldwide, royalty-free license to distribute solely
for use with Palm OS products, the [*]; provided that Licensee does not charge
for copies of the [*]. Licensee agrees that each copy of the [*] will be
accompanied by Licensee's standard end user software license agreement as
provided in Section 10.4 below. In addition, Licensee shall have the right to
sublicense to enterprise end users the right to use and reproduce the [*] for
their internal use pursuant to a signed, written agreement with such enterprise
end users, with no right to further sublicense; provided that the terms of such
agreement shall be at least as protective of the [*] as (i) the terms and
conditions Licensee uses for its own software products, (ii) the minimum terms
and conditions set forth in Attachment 1 attached hereto, and (iii) the terms
and conditions governing this Agreement. Licensee agrees to enforce the terms
and conditions applicable to the [*] contained in such agreements.

5.   ROM LICENSE. The following is added as a new Section 2.12 to the License
Agreement:

     "2.12 Subject to the terms and conditions of this Agreement, Palm hereby
grants to Licensee a limited, non-exclusive, non-transferable (except as
provided in Section 17.9), worldwide, royalty-free license to distribute
directly, solely for the development of products that are designed to be used
with Licensee Products, the ROM image (including both the debug and non-debug
versions) of the Palm OS that Licensee incorporates into Licensee Products (the
"ROM Image"); provided that Licensee does not charge for copies of the ROM
Image. Licensee agrees that each copy of the ROM Image distributed by Licensee
hereunder will be accompanied by a signed, written agreement; provided that the
terms of such agreement shall be at least as protective of the ROM Image as (i)
the terms of the license agreement attached hereto as Attachment 2, and (ii) the
terms and conditions governing this Agreement (the "ROM Image EULA"). Licensee
agrees to enforce the terms and conditions applicable to the ROM Image contained
in such agreements. In the event that Licensee adds functionality to its website
that permits Licensee to distinguish between a developer located in the United
States and a developer located outside of the United States, Licensee may
distribute the ROM Image to United States developers under a ROM Image EULA that
is in clickwrap form, in lieu of a signed written agreement, subject to the
requirements set forth in subsections (i) and (ii) above."

6.   ENTIRE AGREEMENT. The parties agree that this Amendment constitutes the
entire agreement between the parties relating to its subject matter and
supersedes all prior or simultaneous representations, discussions, negotiations,
and agreements, whether written or oral; provided, however, that the License
Agreement, except as modified by this Amendment, remains in full force and
effect.

* Confidential treatment has been requested for certain portions of this
  document pursuant to an application for confidential treatment sent to the
  Securities and Exchange Commission. Such portions are omitted from this filing
  and filed separately with the Securities and Exchange Commission.

                                       5

<PAGE>   6

     IN WITNESS WHEREOF, the parties hereto have executed this Amendment on the
dates set forth below effective as of the Effective Date.

<TABLE>
<S>                                     <C>
PALM, INC.                              HANDSPRING, INC.

By: /s/ MARK BERCOW                     By: /s/ DONNA DUBINSKY
    --------------------------              -----------------------
Name: Mark Bercow                       Name: Donna Dubinsky
Title: VP, Strategic Alliances          Title: CEO
       & Platform
Date: 4/27/00                           Date: 4/17/00
</TABLE>

                                       6
<PAGE>   7

                                   EXHIBIT A-1

                       [Exhibit A-1 consists of 2 pages]

                                      [*]

* Confidential treatment has been requested for certain portions of this
  document pursuant to an application for confidential treatment sent to the
  Securities and Exchange Commission. Such portions are omitted from this filing
  and filed separately with the Securities and Exchange Commission.

                                       7
<PAGE>   8

                                  ATTACHMENT 1

     1.   Subject to the terms of this agreement, [Licensee] grants to [end
user] a non-exclusive, royalty-free, non-assignable and non-transferable license
to reproduce and install the [*] in executable form on personal
computers owned or leased by [end user] for [end user]'s internal use.

     2.   [End user] agrees that the [*] may be used only in
connection with [Licensee's] Palm OS handheld products (the "Products") and may
not be distributed outside [end user]. [End user] shall notify the users of such
personal computers that the [*] may be used only in connection with
the Products and may not be distributed outside [end user].

     3.   [End user] agrees that it shall keep records of the number of copies
of the [*] it installs and the number of Products purchased by [end
user]. Upon request by [Licensee], [end user] shall promptly report in writing
to [Licensee] the number of copies of the [*] installed by [end
user].

     4.   Except as explicitly otherwise set forth in this agreement, the use of
the [*] shall be governed by the [Licensee] End User Software
License Agreement accompanying the Products. Except as provided above, this
agreement does not grant [end user] any rights to patents, copyrights, trade
secrets, trademarks, or any other rights in respect to the [*].

* Confidential treatment has been requested for certain portions of this
  document pursuant to an application for confidential treatment sent to the
  Securities and Exchange Commission. Such portions are omitted from this filing
  and filed separately with the Securities and Exchange Commission.

                                       8
<PAGE>   9

                                  ATTACHMENT 2

                 PROTOTYPE LICENSE AND CONFIDENTIALITY AGREEMENT

This Prototype License and Confidentiality Agreement ("Agreement") is entered
into between the following parties:

        3COM:
        Palm Computing, Inc., a subsidiary of 3Com Corporation ("3Com")
        5400 Bayfront Plaza
        P.O. Box 58007
        Santa Clara, CA, 95052-8007

        and
        LICENSEE:

        ---------------------------------------

        ---------------------------------------

        ---------------------------------------

        ---------------------------------------
        Effective Date:
                       ------------------------

        The parties agree as follows:

1.   LICENSE GRANT. Licensee shall maintain the Prototype (as defined below) at
the following location:________________________________________________________
___________ (the "Prototype Site"). Subject to Licensee's compliance with the
terms and conditions of this Agreement, 3Com hereby grants to Licensee a
nonexclusive, personal, limited, nontransferable right and license to use
certain 3Com pre-release hardware and/or software, documentation and related
3Com products and information (collectively the "Prototype") as identified in an
Appendix to this Agreement but only for the limited purposes set forth in this
Section 1. For each Prototype, 3Com shall provide Licensee with a separate
Appendix which shall be a part of this Agreement. Licensee agrees not to use the
Prototype for any purpose other than: (i) the testing of the Prototype, and (if
applicable), (ii) the development by Licensee of a product, which is designed to
be compatible with the Palm Computing(R) platform ("Licensee Product"), without
violating 3Com's intellectual property rights, including, but not limited to,
trade secrets, patents, copyrights, trade marks and industrial design, or (iii)
to the extent the Prototype is not Confidential Information, the demonstration
of the Licensee Product. Licensee agrees to test the Prototype diligently and to
complete and return promptly any feedback and/or bug reports supplied by 3Com.

2.   STORAGE OF THE PROTOTYPE. To the extent that the Prototype licensed to
Licensee hereunder consists of hardware, Licensee agrees to use and store such
Prototype at all times in a locked room or other form of secured area, if a room
is not available, accessible to only those employees and contractors entitled to
view such Prototype under the terms of Section 4 below, at the Prototype Site.
To the extent that the Prototype consists of software and/or documentation,
Licensee agrees to restrict access to such Prototype so that only those
employees and contractors entitled to view such Prototype under the terms of
Section 4 below may see or use the Prototype. Regardless of the nature of the
Prototype, however, Licensee agrees to maintain an accurate log of all those
given access to the Prototype by the Licensee. Licensee may make only as many
copies of Prototype software and documentation as are reasonably necessary to
effectuate the permitted uses of the Prototype listed in Section 1 above.
Licensee must preserve any proprietary rights notices on or in the Prototype and
must place all such notices on and in any copies made.

3. DEFINITION OF CONFIDENTIAL INFORMATION. Licensee agrees that the Prototype
and any information concerning the Prototype, including its nature and
existence, and any other information disclosed by 3Com to Licensee, including
but not limited to information learned by Licensee from 3Com employees, agents,
or through

                                       9
<PAGE>   10

inspection of 3Com's property, that relates to 3Com's products, designs,
opportunities, finances, research, development, know-how, personnel, or
third-party confidential information disclosed to Licensee by 3Com, and the
existence, terms and conditions of this Agreement will be considered and
referred to collectively in this Agreement as "Confidential Information."
Confidential Information, however, does not include information that: (1) is now
or subsequently becomes generally available to the public through no fault or
breach on the part of Licensee; (2) Licensee can demonstrate to have had
rightfully in its possession prior to disclosure to Licensee by 3Com with
written records; (3) is independently developed by Licensee without the use of
any Confidential Information; or (4) Licensee rightfully obtains from a third
party who has the right to transfer or disclose it without breach or violation
of any obligation of confidentiality. All Confidential Information remains the
sole property of 3Com. Licensee has no implied licenses or other rights in the
Confidential Information not specifically granted in Section 1.

4.   NONDISCLOSURE AND NON USE OF CONFIDENTIAL INFORMATION. Licensee will not
disclose, publish, or disseminate Confidential Information (as defined in
Section 3 above) to anyone other than those of its employees and contractors
with a demonstrable need to know who have binding, written, confidentiality
obligations to Licensee that protect such Confidential Information against
unauthorized disclosure. To the extent that the Prototype consists of software,
Licensee agrees not to decompile, reverse engineer, disassemble or otherwise
reduce the Prototype to a human-perceivable form, and Licensee will not modify,
network, rent, lease, or loan the Prototype in whole or in part. Licensee
further agrees to take reasonable precautions to prevent any unauthorized use,
disclosure, publication, or dissemination of Confidential Information. Licensee
agrees to accept Confidential Information for the sole purpose of effecting the
permitted uses of the Prototype as set forth in Section 1 above. Licensee agrees
not to use Confidential Information otherwise for its own or any third party's
benefit without the prior written approval of an authorized representative of
3Com in each instance.

5.   VERIFICATION OF COMPLIANCE. Licensee agrees that authorized 3Com
representatives with twenty-four hours advance notice may inspect the Prototype
Site, use of the Prototype, copies of other Confidential Information and
Licensee's Prototype access log during Licensee's normal business hours in order
to verify that Licensee is complying with its obligations under this Agreement.

6.   WARRANTY DISCLAIMER. The Prototype may be designated as alpha, beta,
development, pre-release, untested, or not fully tested versions of the
Prototype. The Prototype may contain errors that could cause failures or loss of
data, and may be incomplete or contain inaccuracies. LICENSEE EXPRESSLY
ACKNOWLEDGES AND AGREES THAT USE OF THE PROTOTYPE OR OTHER CONFIDENTIAL
INFORMATION IS AT LICENSEE'S SOLE RISK. THE PROTOTYPE AND OTHER CONFIDENTIAL
INFORMATION ARE PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND AND 3COM
EXPRESSLY DISCLAIMS ALL WARRANTIES, TERMS AND CONDITIONS, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES, TERMS AND CONDITIONS OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT OF THIRD PARTY RIGHTS AND
SATISFACTORY QUALITY. 3COM DOES NOT WARRANT THAT THE FUNCTIONS CONTAINED IN THE
PROTOTYPE OR OTHER CONFIDENTIAL INFORMATION ARE SUITABLE FOR LICENSEE'S USE OR
THAT THE OPERATION OF THE PROTOTYPE OR OTHER CONFIDENTIAL INFORMATION WILL BE
UNINTERRUPTED OR ERROR-FREE, OR THAT DEFECTS IN THE PROTOTYPE OR OTHER
CONFIDENTIAL INFORMATION WILL BE CORRECTED. FURTHERMORE, 3COM DOES NOT WARRANT
OR MAKE ANY REPRESENTATIONS REGARDING THE USE OR THE RESULTS OF THE USE OF THE
PROTOTYPE OR OTHER CONFIDENTIAL INFORMATION OR IN TERMS OF THEIR CORRECTNESS,
ACCURACY, RELIABILITY, OR OTHERWISE. NO ORAL OR WRITTEN INFORMATION OR ADVICE
GIVEN BY 3COM SHALL CREATE A WARRANTY OR IN ANY WAY INCREASE THE SCOPE OF THIS
WARRANTY. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
AGREEMENT. NO USE OF ANY PORTION OF THE PROTOTYPE OR OTHER CONFIDENTIAL
INFORMATION IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER. Licensee
acknowledges that 3Com may not have publicly announced the availability of the
Prototype, that 3Com has not promised or guaranteed to Licensee that such
Prototype will be announced or made available to anyone in the future, and that
3Com has no express or implied obligation to Licensee to announce or introduce
the Prototype or any similar or compatible product, or to continue to offer or
support the Prototype in the future.

                                       10
<PAGE>   11

7.   TERM AND TERMINATION. This Agreement will continue in effect until
terminated in accordance with this Section. Licensee may terminate this
Agreement or an individual seeding project at any time, for any reason, but only
by returning to 3Com: (1) the Prototype and all existent copies of other
Confidential Information on any tangible medium, and (2) a written certification
by an authorized representative of Licensee that all tangible copies of the
Prototype and any other Confidential Information have been returned to 3Com or
completely destroyed and that all electronic memories have been purged of any
Confidential Information. 3Com may terminate this Agreement or an individual
seeding project at any time, with or without cause, immediately upon written
notice to Licensee. Within seven (7) days of Licensee's receipt of 3Coms
termination notice, or earlier if requested by 3Com, Licensee will return the
Prototype and all other Confidential Information as provided in this Section.
All obligations of Licensee under this Agreement will continue to bind Licensee
until Licensee has fully complied with the foregoing requirements of this
Section concerning the return of 3Com materials. Following termination of this
Agreement or an individual seeding project for any reason, the provisions of
Sections 3, 4 and 6 through 15, shall survive.

8.   DISCLAIMER OF LIABILITY. UNDER NO CIRCUMSTANCES SHALL 3COM BE LIABLE FOR
ANY INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR
REVENUE, OR INTERRUPTION OF BUSINESS IN ANY WAY ARISING OUT OF OR RELATED TO THE
USE OR INABILITY TO USE THE PROTOTYPE OR OTHER CONFIDENTIAL INFORMATION OR
3COM'S PERFORMANCE OR FAILURE TO PERFORM UNDER THIS AGREEMENT, REGARDLESS OF THE
FORM OF ACTION, WHETHER IN CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT PRODUCT
LIABILITY OR OTHERWISE, EVEN IF 3COM HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.

9.   NO ASSIGNMENT. Licensee may not assign or otherwise transfer this Agreement
or the rights or obligations hereunder, either in whole or in part, whether
voluntarily or by operation of law, without the prior written consent of 3Com,
which consent may be withheld in 3Com's sole discretion, and any attempted
transfer or assignment is null and void and shall be deemed a material breach of
this Agreement.

10.  INJUNCTIVE RELIEF. Licensee acknowledges and agrees that the copying,
disclosure or use of the Prototype or Confidential Information in a manner
inconsistent with any provision of this Agreement shall cause irreparable injury
to 3Com for which 3Com will not have an adequate remedy at law. Accordingly,
3Com shall be entitled to equitable relief in court, including but not limited
to temporary restraining orders, preliminary injunctions and permanent
injunctions.

11.  EXPORT LAW ASSURANCES. Licensee may not use or otherwise export or reexport
the Prototype or Confidential Information except as authorized by United States
law and the laws of the jurisdiction in which the Prototype or Confidential
Information were obtained. In particular, but without limitation, the Prototype
or Confidential Information may not be used or otherwise exported or reexported
(i) into (or to a national or resident of) any United States embargoed country
or (ii) to anyone on the U.S. Treasury Department's list of Specially Designated
Nationals or the U.S. Department of Commerce's Table of Denial Orders. By using
the Prototype or Confidential Information, Licensee represents and warrants that
Licensee is not located in, under control of, or a national or resident of any
such country or on any such list.

12.  GOVERNMENT END USERS. The Prototype and related documentation are a
"commercial item," as that term is defined in 48 C.F.R. 2.101 (Oct. 1995),
consisting of "commercial computer software" and "commercial computer software
documentation," as such terms are used in 48 C.F.R. 12.212 (Sept. 1995).
Consistent with 48 C.F.R. 12.212 and 48 C.F.R. 227.7202-1 through 227.7202-4
(June 1995), all U.S. Government End Users acquire the Prototype and related
documentation with only those rights set forth herein.

13.  RELATIONSHIP OF THE PARTIES. Nothing stated in this Agreement will be
construed as creating the relationships of joint venturers, partners, employer
and employee, franchisor and franchisee, master and servant, or principal and
agent.

14.  MISCELLANEOUS. This Agreement, including any Appendices, represents the

complete, final and exclusive agreement concerning the subject matter hereof.
Each and every Prototype seeded under this Agreement shall be sent to Licensee
with an Appendix attached which will identify the project code name. Each
Appendix shall (i) have

                                       11
<PAGE>   12

an Effective Date, and (ii) be governed by this Agreement. If any provision of
this Agreement is held to be unenforceable, such provision shall be reformed
only to the extent necessary to make it enforceable. This Agreement shall be
governed by California law provisions (except to the extent applicable law, if
any, provides otherwise), excluding its conflict-of-law provisions. Unless
otherwise agreed in writing, all disputes relating to this Agreement (excepting
any dispute relating to intellectual property rights) shall be subject to final
and binding arbitration, with the losing party paying all costs of arbitration.
Any arbitration relating to this Agreement shall be held in Santa Clara County,
California, under the auspices of JAMS/EndDispute. Any litigation relating to
this Agreement shall be subject to the jurisdiction of the Federal Courts of the
Northern District of California, with venue lying in Santa Clara County,
California, with the losing party responsible for costs, including without
limitation, court costs and reasonable attorneys fees and expenses. The
application of the United Nations Convention on Contracts for the International
Sale of Goods is expressly excluded. Any law or regulation which provides that
the language of a contract shall be construed against the drafter shall not
apply to this Agreement.

15.  ENGLISH LANGUAGE. The parties hereto confirm that they have requested that
this Agreement and all related documents be drafted in English. Les parties ont
exige que le present contrat et tous les documents connexes soient rediges en
anglais.

     In witness whereof, the parties have executed this Agreement as of the
Effective Date.

<TABLE>
<S>                                       <C>
Licensee:                                 3Com: Palm Computing, Inc.,
                                          a subsidiary of 3Com Corporation

By:                                       By:
   -------------------------------           -------------------------------
Printed:                                  Printed:
        --------------------------                --------------------------
Title:                                    Title:
      ----------------------------              ----------------------------

PROTOTYPE LICENSEE SITE DESIGNEE

Printed Name:
             --------------------
Title:
      ---------------------------
E-mail:
       --------------------------
Phone:
      ---------------------------
Fax:
     ----------------------------
</TABLE>

This designated person will be responsible for:

o Receiving "Addressee Only" Prototype materials
o Site Inspection contact

Note: 3Com recommends one and ONLY one person
at any site have these responsibilities. Ideally person
would oversee all compliance factors related to
this Prototype Agreement.

                                       12<PAGE>

                                                                     Exhibit 4.2

                            TRIO-TECH INTERNATIONAL
                  REDEEMABLE WARRANT TO PURCHASE COMMON STOCK

  This certifies that ((First Name)) ((Last Name)) is entitled at any time up to
                      ---------------------------
and including 5:00 p.m. California Time May 10,2002 (the "Expiration Date") to
purchase from Trio-Tech International, a California corporation (hereinafter
called the "Company), ((Warrants)) fully paid and nonassessable shares of Common
                      ------------
Stock of the Company at a price ("Exercise Price") of Eight Dollars ($8.00) per
share upon the surrender hereof to the Company at its office at 355 Parkside
Drive, San Fernando, California 91340, during its usual business hours of any
business day, with simultaneous payment therefor in lawful money of the United
States of the purchase price set forth above.

  This Warrant is one of a series of substantially identical warrants (the
"Warrants") that are being issued in connection with and in exchange for the
exercise (in whole or in part) of a redeemable Warrant to Purchase Common Stock
issued as part of Units consisting of Common Stock and Warrants of the Company
sold in a private placement offering (the "Offering") made by Paragon Capital
Corporation, as Placement Agent, in [October/November] 1997.

  Exercise of Warrant.  Subject to the terms and conditions hereof, this Warrant
  -------------------
may be exercised in whole or in part, at any time during normal business hours
prior to the Expiration Date, by (i) delivery of a written notice, in the form
of the Notice of Exercise attached hereto, of such holder's election to exercise
this Warrant, which notice shall specify the number of shares to be purchased
upon exercise hereof, (ii) payment to the Company of an amount equal to the
Exercise Price multiplied by the number of shares as to which this Warrant is
being exercised (plus any applicable issue or transfer taxes) in cash or by bank
check, and (iii) the surrender of this Warrant at the principal office of the
Company.  If this Warrant is being exercised only in part, the Company shall
issue a new Warrant identical in all respects to this Warrant except that it
shall represent the right to purchase the number of shares as to which this
Warrant is not then being exercised. The Company has the right at its sole
discretion to extend the Expiration Date by notice given to all Warrant holders.
No fractional share shall be issued upon the exercise of rights to purchase
hereunder.

  Antidilution Adjustment.  If the number of outstanding shares of capital stock
  -----------------------
of the Company are increased or decreased by a stock split, reverse stock split,
stock dividend, stock combination, recapitalization or the like, the Exercise
Price and the number of shares purchasable pursuant to this Warrant shall be
adjusted proportionately so that the ratio of (i) the aggregate number of shares
purchasable by exercise of this Warrant to (ii) the total number of shares
outstanding immediately following such stock split, reverse stock split, stock
dividend, stock combination, recapitalization or the like shall remain
unchanged, and the aggregate purchase price of shares issuable pursuant to this
Warrant shall remain unchanged.  No adjustment shall be made for any issuances
of shares other than as described above.

  Registration of Underlying Common Stock.  Prior to the Company giving a notice
  ---------------------------------------
of redemption of Warrants hereunder, the Company must file a Registration
Statement with the Securities and Exchange Commission ("SEC") to register, under
the Securities Act of 1933, as amended (the "Securities Act"), the resale of the
Common Stock issuable upon exercise of this Warrant and all other Warrants, and
such Registration Statement must have become effective.  The Company shall
maintain the effectiveness thereof until all shares registered thereunder have
been disposed of or are freely tradeable under Rule 144(k) under the Securities
Act.

                                       1.
<PAGE>

  Redemption of Warrants.  The Company may call the Warrants for redemption in
  ----------------------
whole or in part at a price of $.10 for each share issuable upon exercise of the
Warrants, by written notice specifying the redemption date, such notice to be
mailed at least 30 days before such redemption date, to the Warrant holders at
their respective addresses as they appear on the books of the Company; provided,
however, that such notice may only be mailed within 10 days following any period
of 20 consecutive trading days during which the closing bid price for the Common
Stock on the Nasdaq Small Cap Market (or such other trading market as the Common
Stock may then be trading) has equalled or exceeded $9.00 per share on each such
day (subject to adjustment for any stock dividends, stock splits, reverse stock
splits or similar events that shall have occurred between the date of issuance
of this Warrant and the date of such notice).  If the Company elects to redeem
part, but not all, of the Warrants, then such redemption shall be made pro rata
with respect to all of the Warrants.  This Warrant may be exercised at any time
prior to the close of business on the date prior to the redemption date, and if
not then exercised will terminate and be cancelled.

  Restrictions on Transfer of Warrants.  Until such time as the resale of the
  ------------------------------------
Common Stock issuable upon exercise of this Warrant has become registered under
the Securities Act, this Warrant may not be sold or transferred to any Person
except to other Persons who are registered owners of the Warrants.  The term
"Person" means an individual or a corporation, partnership, trust, limited
liability company, incorporated or unincorporated association, joint venture, or
other entity of any kind.

  Notice of Adjustment of Exercise Price and Number of Warrant Shares.  Upon any
  -------------------------------------------------------------------
adjustment of the Exercise Price of this Warrant or the number of shares
issuable hereunder, the Company shall give notice thereof to the registered
holder of this Warrant which shall set forth the new Exercise Price in effect
after such adjustment and the increase or decrease, if any, in the number of
shares issuable upon exercise of this Warrant.  All such notices shall set forth
in reasonable detail the method of calculation and the facts upon which such
calculation is based.

  Notice of Certain Events.  In case at any time (a) there shall be any
  ------------------------
reorganization or reclassification of the capital stock of the Company or
consolidation or merger of the Company with, or sale of all or substantially all
of its assets to, another corporation or entity; or (b) there shall be a
voluntary or involuntary dissolution, liquidation or winding up of the Company;
then, in any one or more of said cases, the Company shall give notice to the
registered holder of this Warrant of the date on which such reorganization,
reclassification, consolidation, merger, sale, dissolution, liquidation or
winding up shall take place.  Such notice shall be given not less than 20 days
prior to the action in question.

  No Rights as Shareholder.  Prior to the exercise of this Warrant the holder of
  ------------------------
this Warrant shall not be entitled to any rights of a shareholder of the
Company, including, without limitation, the right to vote, to receive dividends
or other distributions, or to receive notice of meetings of shareholders.

  Lost, Stolen, Mutilated or Destroyed Warrants.  If this Warrant is lost,
  ---------------------------------------------
stolen, mutilated or destroyed, the Company shall, on such terms as to indemnity
or otherwise as it may in its discretion impose (which in the case of a
mutilated Warrant shall include the surrender thereof), issue a new Warrant of
like denomination and tenor as the Warrant so lost, stolen, mutilated or
destroyed.  Any such new Warrant shall constitute an original contractual
obligation of the Company, whether or not the allegedly lost, stolen, mutilated
or destroyed Warrant shall be at any time enforceable by anyone.

  Miscellaneous.  This Warrant and any term hereof may be changed, waived,
  -------------
discharged or terminated only by an instrument in writing signed by the Person
or holder hereof against which enforcement of such change, waiver, discharge or
termination is sought.  The headings in this Warrant are for purposes of
reference only and shall not limit or otherwise affect the meaning hereof.

                                       2.
<PAGE>

  IN WITNESS WHEREOF, the Company has executed this Warrant as of the day and
year first above written.

Dated:  May 10, 2000          TRIO-TECH INTERNATIONAL

                              By
                                --------------------------------------------
                                A. Charles Wilson, Chairman

                                       3.
<PAGE>

                              NOTICE OF EXERCISE

                    TO BE EXECUTED BY THE REGISTERED HOLDER
                       IN ORDER TO EXERCISE THIS WARRANT

                            TRIO-TECH INTERNATIONAL

  The undersigned hereby exercises the right to purchase_______________________
shares of Common Stock covered by this Warrant according to the conditions
thereof and herewith makes payment of $______________________________, the
aggregate Exercise Price of such shares of Common Stock.

                              [Print or type name(s) of Holder.  If Holder is a
                              trust, partnership, corporation or other entity,
                              print name and title of authorized signatory.]

                              Signature(s) of Holder or authorized signatory

                                       4.

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