<PAGE>   1
                                                                   EXHIBIT 10.26

                 ADDENDUM TO STANDBY LETTER OF CREDIT AGREEMENT


        THIS ADDENDUM is attached to and made a part of that certain Letter of
Credit Agreement executed by HANDSPRING, INC ("Applicant") and WELLS FARGO BANK,
NATIONAL ASSOCIATION ("Bank") dated as of February 16, 2001 (the "Agreement").

        The following are hereby incorporated into the Agreement:

        1. REPORTING. So long as the Agreement remains in effect, Applicant
shall provide to Bank all of the following, in form and detail satisfactory to
Bank:

               (a) not later than 120 days after and as of the end of each
        fiscal year, an audited financial statement of Applicant, prepared by
        independent certified public accountants acceptable to Bank, to include
        balance sheet, income statement, statement of cash flows and footnotes;
        and

               (b) from time to time such other information as Bank may
        reasonably request.

        2. LETTER OF CREDIT FEES. Applicant shall pay to Bank (i) fees upon the
issuance of each Credit (and each amendment which increases the amount or the
duration of each Credit) equal to one quarter percent (0.25%) per annum of the
face amount of such Credit or increase, and (ii) all other fees, costs and
expenses set forth in the Agreement.

        3 ARBITRATION.

        (a) Arbitration. The parties hereto agree, upon demand by any party, to
submit to binding arbitration all claims, disputes and controversies between or
among them (and their respective employees, officers, directors, attorneys, and
other agents), whether in tort, contract or otherwise arising out of or relating
to in any way (i) the loan and related loan and security documents which are the
subject of the Agreement and its negotiation, execution, collateralization,
administration, repayment, modification, extension, substitution, formation,
inducement, enforcement, default or termination; or (ii) requests for additional
credit.

        (b) Governing Rules. Any arbitration proceeding will (i) proceed in a
location in California selected by the American Arbitration Association ("AAA");
(ii) be governed by the Federal Arbitration Act (Title 9 of the United States
Code), notwithstanding any conflicting choice of law provision in any of the
documents between the parties; and (iii) be conducted by the AAA, or such other
administrator as the parties shall mutually agree upon, in accordance with the
AAA's commercial dispute resolution procedures, unless the claim or counterclaim
is at least $1,000,000.00 exclusive of claimed interest, arbitration fees and
costs in which case the arbitration shall be conducted in accordance with the
AAA's optional procedures for large, complex commercial disputes (the commercial
dispute resolution procedures or the optional procedures for large, complex
commercial disputes to be referred to, as applicable, as the "Rules"). If there
is any inconsistency between the terms hereof and the Rules, the terms and
procedures set forth herein shall control. Any party who fails or refuses to
submit to arbitration following a demand by any other party shall bear all costs
and expenses incurred by such other party in compelling arbitration of any
dispute. Nothing contained herein shall be deemed to be a waiver by any party
that is a bank of the protections afforded to it under 12 U.S.C. Section 91 or
any similar applicable state law.


                                      -1-
<PAGE>   2

        (c) No Waiver of Provisional Remedies, Self-Help and Foreclosure. The
arbitration requirement does not limit the right of any party to (i) foreclose
against real or personal property collateral; (ii) exercise self-help remedies
relating to collateral or proceeds of collateral such as setoff or repossession;
or (iii) obtain provisional or ancillary remedies such as replevin, injunctive
relief, attachment or the appointment of a receiver, before during or after the
pendency of any arbitration proceeding. This exclusion does not constitute a
waiver of the right or obligation of any party to submit any dispute to
arbitration or reference hereunder, including those arising from the exercise of
the actions detailed in sections (i), (ii) and (iii) of this paragraph.

        (d) Arbitrator Qualifications and Powers. Any arbitration proceeding in
which the amount in controversy is $5,000,000.00 or less will be decided by a
single arbitrator selected according to the Rules, and who shall not render an
award of greater than $5,000,000.00. Any dispute in which the amount in
controversy exceeds $5,000,000.00 shall be decided by majority vote of a panel
of three arbitrators; provided however, that all three arbitrators must actively
participate in all hearings and deliberations. The arbitrator will be a neutral
attorney licensed in the State of California or a neutral retired judge of the
state or federal judiciary of California, in either case with a minimum of ten
years experience in the substantive law applicable to the subject matter of the
dispute to be arbitrated. The arbitrator will determine whether or not an issue
is arbitratable and will give effect to the statutes of limitation in
determining any claim. In any arbitration proceeding the arbitrator will decide
(by documents only or with a hearing at the arbitrator's discretion) any
pre-hearing motions which are similar to motions to dismiss for failure to state
a claim or motions for summary adjudication. The arbitrator shall resolve all
disputes in accordance with the substantive law of California and may grant any
remedy or relief that a court of such state could order or grant within the
scope hereof and such ancillary relief as is necessary to make effective any
award. The arbitrator shall also have the power to award recovery of all costs
and fees, to impose sanctions and to take such other action as the arbitrator
deems necessary to the same extent a judge could pursuant to the Federal Rules
of Civil Procedure, the California Rules of Civil Procedure or other applicable
law. Judgment upon the award rendered by the arbitrator may be entered in any
court having jurisdiction. The institution and maintenance of an action for
judicial relief or pursuit of a provisional or ancillary remedy shall not
constitute a waiver of the right of any party, including the plaintiff, to
submit the controversy or claim to arbitration if any other party contests such
action for judicial relief.

        (e) Discovery. In any arbitration proceeding discovery will be permitted
in accordance with the Rules. All discovery shall be expressly limited to
matters directly relevant to the dispute being arbitrated and must be completed
no later than 20 days before the hearing date and within 180 days of the filing
of the dispute with the AAA. Any requests for an extension of the discovery
periods, or any discovery disputes, will be subject to final determination by
the arbitrator upon a showing that the request for discovery is essential for
the party's presentation and that no alternative means for obtaining information
is available.

        (f) Class Proceedings and Consolidations. The resolution of any dispute
arising pursuant to the terms of this Note shall be determined by a separate
arbitration proceeding and such dispute shall not be consolidated with other
disputes or included in any class proceeding.

        (g) Payment Of Arbitration Costs And Fees. The arbitrator shall award
all costs and expenses of the arbitration proceeding.

        (h) Real Property Collateral; Judicial Reference. Notwithstanding
anything herein to the contrary, no dispute shall be submitted to arbitration if
the dispute concerns indebtedness


                                      -2-
<PAGE>   3

secured directly or indirectly, in whole or in part, by any real property unless
(i) the holder of the mortgage, lien or security interest specifically elects in
writing to proceed with the arbitration, or (ii) all parties to the arbitration
waive any rights or benefits that might accrue to them by virtue of the single
action rule statute of California, thereby agreeing that all indebtedness and
obligations of the parties, and all mortgages, liens and security interests
securing such indebtedness and obligations, shall remain fully valid and
enforceable. If any such dispute is not submitted to arbitration, the dispute
shall be referred to a referee in accordance with California Code of Civil
Procedure Section 638 et seq., and this general reference agreement is intended
to be specifically enforceable in accordance with said Section 638. A referee
with the qualifications required herein for arbitrators shall be selected
pursuant to the AAA's selection procedures. Judgment upon the decision rendered
by a referee shall be entered in the court in which such proceeding was
commenced in accordance with California Code of Civil Procedure Sections 644 and
645.

        (i) Miscellaneous. To the maximum extent practicable, the AAA, the
arbitrators and the parties shall take all action required to conclude any
arbitration proceeding within 180 days of the filing of the dispute with the
AAA. No arbitrator or other party to an arbitration proceeding may disclose the
existence, content or results thereof, except for disclosures of information by
a party required in the ordinary course of its business or by applicable law or
regulation. If more than one agreement for arbitration by or between the parties
potentially applies to a dispute, the arbitration provision most directly
related to the documents between the parties or the subject matter of the
dispute shall control. This Agreement may be amended or modified only in writing
signed by each party hereto. If any provision of this Agreement shall be held to
be prohibited by or invalid under applicable law such provision shall be
ineffective only to the extent of such prohibition or invalidity, without
invalidating the remainder of such provision or any remaining provisions of this
Agreement. This arbitration provision shall survive termination, amendment or
expiration of any of the documents or any relationship between the parties.

        IN WITNESS WHEREOF, this Addendum has been executed as of the same date
as the Agreement.

HANDSPRING, INC                           WELLS FARGO BANK,
                                          NATIONAL ASSOCIATION
By: /s/  Bernard Whitney
    --------------------------
Title: CFO                                By: /s/ Jill B. Ta
       -----------------------                --------------------------
                                          Title: Vice President
                                                 -----------------------

By: /s/  David Pine
    --------------------------
Title: VP, General Counsel
       -----------------------


                                      -3-