Document:

<PAGE>

                                                                   EXHIBIT 10.20

[LOGO OF US BANK]

                            BUSINESS LOAN AGREEMENT

<TABLE>
<CAPTION>
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       Principal    Loan Date       Maturity      Loan No   Call      Collateral     Account   Officer   Initials
     <S>            <C>            <C>            <C>       <C>       <C>          <C>         <C>       <C>
     $4,000,000.00  08-15-1999     08-15-20001    733/18                 0/10      0340178007   CMB65
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</TABLE>

 References in the shaded area are for Lender's use only and do not limit the
        applicability of this document to any particular loan or item.
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  BORROWER: AVT CORPORATION        Lender: U.S. Bank National Association
            11410 NE 122ND WAY             South Seattle Corporation Banking
            KIRKLAND, WA 98083             1420 Fifth Avenue
                                           Seattle, WA 98101
================================================================================

     THIS BUSINESS LOAN AGREEMENT between AVT CORPORATION ("Borrower") and
     UcriderFinancial Printing GroupTHIS BUSINESS LOAN AGREEMENT between AVT
     CORPORATION ("Borrower") and U.S. Bank National Association ("Lender") is
     made and executed on the following terms and conditions. Borrower has
     received prior commercial loans from Lender or has applied to Lender for a
     commercial loan or loans and other financial accommodations, Including
     those which may be described on any exhibit or schedule attached to this
     Agreement. All such loans and financial accommodations, together with all
     future loans and financial accommodations from Lender to Borrower, are
     referred to In this Agreement Individually as the "Loan" and collectively
     as the "Loans." Borrower understands and agrees that: (a) In granting,
     renewing, or extending any Loan, Lender Is relying upon Borrower's
     representations, warranties, and agreements, as set forth in this
     Agreement; (b) the granting, renewing, or extending of any Loan by Lender
     at all times shall be subject to Lender's sole Judgment and discretion; and
     (c) all such Loans shall be and shall remain subject to the following terms
     and conditions of this Agreement.

     TERM. This Agreement shall be effective as of August 15, 1999, and shall
     continue thereafter until all Indebtedness of Borrower to Lender has been
     performed in full and the parties terminate this Agreement in writing.

     DEFINITIONS. The following words shall have the following meanings when
     used in this Agreement. Terms not otherwise defined in this Agreement shall
     have the meanings attributed to such terms in the Uniform Commercial Code.
     All references to dollar amounts shall mean amounts in lawful money of the
     United States of America.

          Agreement. The word "Agreement" means this Business Loan Agreement, as
          this Business Loan Agreement may be amended or modified from time to
          time, together with all exhibits and schedules attached to this
          Business Loan Agreement from time to time.

          Borrower. The word "Borrower" means AVT CORPORATION. The word
          "Borrower" also includes, as applicable, all subsidiaries and
          affiliates of Borrower as provided below in the paragraph titled
          "Subsidiaries and Affiliates."

          CERCLA. The word "CERCLA" means the Comprehensive Environmental
          Response, Compensation, and Liability Act of 1980, as amended.

          Cash Flow. The words "Cash Flow" mean net income after taxes, and
          exclusive of extraordinary gains and income, plus depreciation and
          amortization.

          Collateral. The word "Collateral" means and includes without
          limitation all property and assets granted as collateral security for
          a Loan, whether real or personal property, whether granted directly or
          indirectly, whether granted now or in the future, and whether granted
          in the form of a security interest, mortgage, deed of trust,
          assignment, pledge, chattel mortgage, chattel trust, factor's lien,
          equipment trust, conditional sale, trust receipt, lien, charge, lien
          or title retention contract, lease or consignment intended as a
          security device, or any other security or lien interest whatsoever,
          whether created by law, contract, or otherwise.

          Debt. The word "Debt" means all of Borrower's liabilities excluding
          Subordinated Debt.

          ERISA. The word "ERISA" means the Employee Retirement Income Security
          Act of 1974, as amended.

          Event of Default. The words "Event of Default" mean and include
          without limitation any of the Events of Default set forth below in the
          section titled "EVENTS OF DEFAULT."

          Grantor. The word "Grantor" means and includes without limitation each
          and all of the persons or entities granting a Security Interest in any
          Collateral for the Indebtedness, including without limitation all
          Borrowers granting such a Security Interest.

          Guarantor. The word "Guarantor" means and includes without limitation
          each and all of the guarantors, sureties, and accommodation parties in
          connection with any Indebtedness.

          Indebtedness. The word "Indebtedness" means and includes without
          limitation all Loans, together with all other obligations, debts and
          liabilities of Borrower to Lender, or any one or more of them, as well
          as all claims by Lender against Borrower, or any one or more of them;
          whether now or hereafter existing, voluntary or involuntary, due or
          not due, absolute or contingent, liquidated or unliquidated; whether
          Borrower may be liable individually or jointly with others; whether
          Borrower may be obligated as a guarantor, surety, or otherwise;
          whether recovery upon such Indebtedness may be or hereafter may become
          barred by any statute of limitations; and whether such Indebtedness
          may be or hereafter may become otherwise unenforceable.

          Lender. The word "Lender" means U.S. Bank National Association, Its
          successors and assigns.

          Liquid Assets. The words "Liquid Assets" mean Borrower's cash on hand
          plus Borrower's readily marketable securities.

          Loan. The word "Loan" or "Loans" means and includes without limitation
          any and all commercial loans and financial accommodations from Lender
          to Borrower, whether now or hereafter existing, and however evidenced,
          including without limitation those loans and financial accommodations
          described herein or described on any exhibit or schedule attached to
          this Agreement from time to time.

          Note. The word "Note" means and includes without limitation Borrower's
          promissory note or notes, if any, evidencing Borrower's Loan
          obligations in favor of Lender, as well as any substitute, replacement
          or refinancing note or notes therefor.

          Permitted Liens. The words "Permitted Liens" mean: (a) liens and
          security interests securing Indebtedness owed by Borrower to Lender;
          (b) liens for taxes, assessments, or similar charges either not yet
          due or being contested in good faith; (c) liens of materialmen,
          mechanics, warehousemen, or carriers, or other like liens arising in
          the ordinary course of business and securing obligations which are not
          yet delinquent; (d) purchase money liens or purchase money security
          interests upon or in any property acquired or held by Borrower in the
          ordinary course of business to secure indebtedness outstanding on the
          date of this Agreement or permitted to be incurred under the paragraph
          of this Agreement titled "Indebtedness and Liens"; (e) liens and
          security interests which, as of the date of this Agreement, have been
          disclosed to and approved by the Lender in writing; and (f) those
          liens and security interests which in the aggregate constitute an
          immaterial and insignificant monetary amount with respect to the net
          value of Borrower's assets.

          Related Documents. The words "Related Documents" mean and include
          without limitation all promissory notes, credit agreements, loan
          agreements, environmental agreements, guaranties, security agreements,
          mortgages, deeds of trust, and all other instruments, agreements and
          documents, whether now or hereafter existing, executed in connection
          with the Indebtedness.

          Security Agreement. The words "Security Agreement" mean and include
          without limitation any agreements, promises, covenants, arrangements,
          understandings or other agreements, whether created by law, contract,
          or otherwise, evidencing, governing, representing, or creating a
          Security Interest.

          Security Interest. The words "Security Interest" mean and include
          without limitation any type of collateral security, whether in the
          form of a lien, charge, mortgage, deed of trust, assignment, pledge,
          chattel mortgage, chattel trust, factor's lien, equipment trust,
          conditional sale, trust receipt, lien or title retention contract,
          lease or consignment intended as a security device, or any other
          security or lien interest whatsoever, whether created by law,
          contract, or otherwise.

          SARA. The word "SARA" means the Superfund Amendments and
          Reauthorization Act of 1986 as now or hereafter amended.

          Subordinated Debt. The words "Subordinated Debt" mean indebtedness and
          liabilities of Borrower which have been subordinated by written
          agreement to indebtedness owed by Borrower to Lender in form and
          substance acceptable to Lender.

          Tangible Net Worth. The words "Tangible Net Worth" mean Borrower's
          total assets excluding all intangible assets (i.e., goodwill,
          trademarks, patents, copyrights, organizational expenses, and similar
          intangible items, but including leaseholds and leasehold Improvements)
          less total Debt.

          Working Capital. The words "Working Capital" mean Borrower's current
          assets, excluding prepaid expenses, less Borrower's current
          liabilities.

     CONDITIONS PRECEDENT TO EACH ADVANCE. Lender's obligation to make the
     initial Loan Advance and each subsequent Loan Advance under this Agreement
     shall be subject to the fulfillment to Lender's satisfaction of all of the
     conditions set forth in this Agreement and in the Related Documents.

          Loan Documents. Borrower shall provide to Lender in form satisfactory
          to Lender the following documents for the Loan: (a) the Note, (b)
          Security Agreements granting to Lender security interests in the
          Collateral, (c) Financing Statements perfecting Lender's Security
          Interests; (d) evidence of insurance as required below; and (e) any
          other documents required under this Agreement or by Lender or its
          counsel.
<PAGE>

08-15-1999                  BUSINESS LOAN AGREEMENT                       Page 2
Loan No 733/18                    (Continued)

================================================================================
     Borrower's Authorization. Borrower shall have provided in form and
     substance satisfactory to Lender properly certified resolutions, duly
     authorizing the execution and delivery of this Agreement, the Note and the
     Related Documents, and such other authorizations and other documents and
     instruments as Lender or its counsel, in their sole discretion, may
     require.

     Payment of Fees and Expenses. Borrower shall have paid to Lender all fees,
     charges, and other expenses which are then due and payable as specified in
     this Agreement or any Related Document.

     Representations and Warranties. The representations and warranties set
     forth in this Agreement, in the Related Documents, and in any document or
     certificate delivered to Lender under this Agreement are true and correct.

     No Event of Default. There shall not exist at the time of any advance a
     condition which would constitute an Event of Default under this Agreement.

REPRESENTATIONS AND WARRANTIES. Borrower represents and warrants to Lender, as
of the date of this Agreement, as of the date of each disbursement of Loan
proceeds, as of the date of any renewal, extension or modification of any Loan,
and at all times any Indebtedness exists:

     Organization. Borrower is a corporation which is duly organized, validly
     existing, and in good standing under the laws of the State of Washington
     and is validly existing and in good standing in all states in which
     Borrower is doing business. Borrower has the full power and authority to
     own its properties and to transact the businesses in which it is presently
     engaged or presently proposes to engage. Borrower also is duly qualified as
     a foreign corporation and is in good standing in all states in which the
     failure to so qualify would have a material adverse effect on its
     businesses or financial condition.

     Authorization. The execution, delivery, and performance of this Agreement
     and all Related Documents by Borrower, to the extent to be executed,
     delivered or performed by Borrower, have been duly authorized by all
     necessary action by Borrower; do not require the consent or approval of any
     other person, regulatory authority or governmental body; and do not
     conflict with, result in a violation of, or constitute a default under (a)
     any provision of its articles of incorporation or organization, or bylaws,
     or any agreement or other instrument binding upon Borrower or (b) any law,
     governmental regulation, court decree, or order applicable to Borrower.

     Financial Information. Each financial statement of Borrower supplied to
     Lender truly and completely disclosed Borrower's financial condition as of
     the date of the statement, and there has been no material adverse change in
     Borrower's financial condition subsequent to the date of the most recent
     financial statement supplied to Lender. Borrower has no material contingent
     obligations except as disclosed in such financial statements.

     Legal Effect. This Agreement constitutes, and any instrument or agreement
     required hereunder to be given by Borrower when delivered will constitute,
     legal, valid and binding obligations of Borrower enforceable against
     Borrower in accordance with their respective terms.

     Properties. Except as contemplated by this Agreement or as previously
     disclosed in Borrower's financial statements or in writing to Lender and as
     accepted by Lender, and except for property tax liens for taxes not
     presently due and payable, Borrower owns and has good title to all of
     Borrower's properties free and clear of all Security Interests, and has not
     executed any security documents or financing statements relating to such
     properties. All of Borrower's properties are titled in Borrower's legal
     name, and Borrower has not used, or filed a financing statement under, any
     other name for at least the last five (5) years.

     Hazardous Substances. The terms "hazardous waste," "hazardous substance,"
     "disposal," "release," and "threatened release," as used in this Agreement,
     shall have the same meanings as set forth in the "CERCLA," "SARA," the
     Hazardous Materials Transportation Act, 49 U.S.C. Section 1801, et seq.,
     the Resource Conservation and Recovery Act, 42 U.S.C. Section 6901, et
     seq., or other applicable state or Federal laws, rules, or regulations
     adopted pursuant to any of the foregoing. Except as disclosed to and
     acknowledged by Lender in writing, Borrower represents and warrants that:
     (a) During the period of Borrower's ownership of the properties, there has
     been no use, generation, manufacture, storage, treatment, disposal, release
     or threatened release of any hazardous waste or substance by any person on,
     under, about or from any of the properties. (b) Borrower has no knowledge
     of, or reason to believe that there has been (i) any use, generation,
     manufacture, storage, treatment, disposal, release, or threatened release
     of any hazardous waste or substance on, under, about or from the properties
     by any prior owners or occupants of any of the properties, or (ii) any
     actual or threatened litigation or claims of any kind by any person
     relating to such matters. (c) Neither Borrower nor any tenant, contractor,
     agent or other authorized user of any of the properties shall use,
     generate, manufacture, store, treat, dispose of, or release any hazardous
     waste or substance on, under, about or from any of the properties; and any
     such activity shall be conducted in compliance with all applicable federal,
     state, and local laws, regulations, and ordinances, including without
     limitation those laws, regulations and ordinances described above. Borrower
     authorizes Lender and its agents to enter upon the properties to make such
     inspections and tests as Lender may deem appropriate to determine
     compliance of the properties with this section of the Agreement. Any
     inspections or tests made by Lender shall be at Borrower's expense and for
     Lender's purposes only and shall not be construed to create any
     responsibility or liability on the part of Lender to Borrower or to any
     other person. The representations and warranties contained herein are based
     on Borrower's due diligence in investigating the properties for hazardous
     waste and hazardous substances. Borrower hereby (a) releases and waives any
     future claims against Lender for indemnity or contribution in the event
     Borrower becomes liable for cleanup or other costs under any such laws, and
     (b) agrees to indemnify and hold harmless Lender against any and all
     claims, losses, liabilities, damages, penalties, and expenses which Lender
     may directly or indirectly sustain or suffer resulting from a breach of
     this section of the Agreement or as a consequence of any use, generation,
     manufacture, storage, disposal, release or threatened release of a
     hazardous waste or substance on the properties. The provisions of this
     section of the Agreement, including the obligation to indemnify, shall
     survive the payment of the Indebtedness and the termination or expiration
     of this Agreement and shall not be affected by Lender's acquisition of any
     interest in any of the properties, whether by foreclosure or otherwise.

     Litigation and Claims. No litigation, claim, investigation, administrative
     proceeding or similar action (including those for unpaid taxes) against
     Borrower is pending or threatened, and no other event has occurred which
     may materially adversely affect Borrower's financial condition or
     properties, other than litigation, claims, or other events, if any, that
     have been disclosed to and acknowledged by Lender in writing.

     Taxes. To the best of Borrower's knowledge, all tax returns and reports of
     Borrower that are or were required to be filed, have been filed, and all
     taxes, assessments and other governmental charges have been paid in full,
     except those presently being or to be contested by Borrower in good faith
     in the ordinary course of business and for which adequate reserves have
     been provided.

     Lien Priority. Unless otherwise previously disclosed to Lender in writing,
     Borrower has not entered into or granted any Security Agreements, or
     permitted the filing or attachment of any Security Interests on or
     affecting any of the Collateral directly or indirectly securing repayment
     of Borrower's Loan and Note, that would be prior or that may in any way be
     superior to Lender's Security Interests and rights in and to such
     Collateral.

     Binding Effect. This Agreement, the Note, all Security Agreements directly
     or indirectly securing repayment of Borrower's Loan and Note and all of the
     Related Documents are binding upon Borrower as well as upon Borrower's
     successors, representatives and assigns, and are legally enforceable in
     accordance with their respective terms.

     Commercial Purposes. Borrower intends to use the Loan proceeds solely for
     business or commercial related purposes.

     Employee Benefit Plans. Each employee benefit plan as to which Borrower may
     have any liability complies in all material respects with all applicable
     requirements of law and regulations, and (i) no Reportable Event nor
     Prohibited Transaction (as defined in ERISA) has occurred with respect to
     any such plan, (ii) Borrower has not withdrawn from any such plan or
     initiated steps to do so, (iii) no steps have been taken to terminate any
     such plan, and (iv) there are no unfunded liabilities other than those
     previously disclosed to Lender in writing.

     Location of Borrower's Offices and Records. Borrower's place of business,
     or Borrower's Chief executive office, if Borrower has more than one place
     of business, is located at 11410 NE 122ND WAY, KIRKLAND, WA 98083. Unless
     Borrower has designated otherwise in writing this location is also the
     office or offices where Borrower keeps its records concerning the
     Collateral.

     Information. All information heretofore or contemporaneously herewith
     furnished by Borrower to Lender for the purposes of or in connection with
     this Agreement or any transaction contemplated hereby is, and all
     information hereafter furnished by or on behalf of Borrower to Lender will
     be, true and accurate in every material respect on the date as of which
     such information is dated or certified; and none of such information is or
     will be incomplete by omitting to state any material fact necessary to make
     such information not misleading.

     Survival of Representations and Warranties. Borrower understands and agrees
     that Lender, without independent investigation, is relying upon the above
     representations and warranties in extending Loan Advances to Borrower.
     Borrower further agrees that the foregoing representations and warranties
     shall be continuing in nature and shall remain in full force and effect
     until such time as Borrower's Indebtedness shall be paid in full, or until
     this Agreement shall be terminated in the manner provided above, whichever
     is the last to occur.

AFFIRMATIVE COVENANTS. Borrower covenants and agrees with Lender that, while
this Agreement is in effect, Borrower will:

     Litigation. Promptly inform Lender in writing of (a) all material adverse
     changes in Borrower's financial condition, and (b) all existing and all
     threatened litigation, claims, investigations, administrative proceedings
     or similar actions affecting Borrower or any Guarantor which could
     materially affect the financial condition of Borrower or the financial
     condition of any Guarantor.

     Financial Records. Maintain its books and records in accordance with
     generally accepted accounting principles, applied on a consistent basis,
     and permit Lender to examine and audit Borrower's books and records at all
     reasonable times.
<PAGE>

08-15-1999                  BUSINESS LOAN AGREEMENT                       Page 3
Loan No 733/18                    (Continued)

================================================================================

     Additional Information. Furnish such additional information and statements,
     lists of assets and liabilities, agings of receivables and payables,
     inventory schedules, budgets, forecasts, tax returns, and other reports
     with respect to Borrower's financial condition and business operations as
     Lender may request from time to time.

     Financial Covenants and Ratios. Comply with the following covenants and
     ratios:

          Tangible Net Worth. Maintain a minimum Tangible Net Worth of not less
          than $50,000,000.00.

          Net Worth Ratio. Maintain a ratio of Total Liabilities to Tangible Net
          Worth of less than 0.50 to 1.00.

          Working Capital. Maintain Working Capital in excess of $10,000,000.00.

     The following provisions shall apply for purposes of determining compliance
     with the foregoing financial covenants and ratios: Compliance with all
     covenants and ratios shall be determined by calculating the ratios/amounts
     as of the end of each quarter. Covenants from acquisition will govern all
     credit facilities unless cancelled. If acquisition facility Is not funded
     and Is cancelled, then the above covenants will apply. Except as provided
     above, all computations made to determine compliance with the requirements
     contained in this paragraph shall be made in accordance with generally
     accepted accounting principles, applied on a consistent basis, and
     certified by Borrower as being true and correct.

     Insurance. Maintain fire and other risk insurance, public liability
     insurance, and such other insurance as Lender may require with respect to
     Borrower's properties and operations, in form, amounts, coverages and with
     insurance companies reasonably acceptable to Lender. Borrower, upon request
     of Lender, will deliver to Lender from time to time the policies or
     certificates of insurance in form satisfactory to Lender, including
     stipulations that coverages will not be cancelled or diminished without at
     least ten (10) days' prior written notice to Lender. Each insurance policy
     also shall include an endorsement providing that coverage in favor of
     Lender will not be impaired in any way by any act, omission or default of
     Borrower or any other person. In connection with all policies covering
     assets in which Lender holds or is offered a security interest for the
     Loons, Borrower will provide Lender with such loss payable or other
     endorsements as Lender may require.

     Insurance Reports. Furnish to Lender, upon request of Lender, reports on
     each existing insurance policy showing such information as Lender may
     reasonably request, including without limitation the following: (a) the
     name of the insurer; (b) the risks insured; (c) the amount of the policy;
     (d) the properties insured; (e) the then current property values on the
     basis of which insurance has been obtained, and the manner of determining
     those values; and (f) the expiration date of the policy. In addition, upon
     request of Lender (however not more often than annually), Borrower will
     have an independent appraiser satisfactory to Lender determine, as
     applicable, the actual cash value or replacement cost of any Collateral.
     The cost of such appraisal shall be paid by Borrower.

     Other Agreements. Comply with all terms and conditions of all other
     agreements, whether now or hereafter existing, between Borrower and any
     other party and notify Lender immediately in writing of any default in
     connection with any other such agreements.

     Loan Proceeds. Use all Loan proceeds solely for Borrower's business
     operations, unless specifically consented to the contrary by Lender in
     writing.

     Taxes, Charges and Liens. Pay and discharge when due all of its
     indebtedness and obligations, including without limitation all assessments,
     taxes, governmental charges, levies and liens, of every kind and nature,
     imposed upon Borrower or its properties, income, or profits, prior to the
     date on which penalties would attach, and all lawful claims that, if
     unpaid, might become a lien or charge upon any of Borrower's properties,
     income, or profits. Provided however, Borrower will not be required to pay
     and discharge any such assessment, tax, charge, levy, lien or claim so long
     as (a) the legality of the same shall be contested in good faith by
     appropriate proceedings, and (b) Borrower shall have established on its
     books adequate reserves with respect to such contested assessment, tax,
     charge, levy, lien, or claim in accordance with generally accepted
     accounting practices. Borrower, upon demand of Lender, will furnish to
     Lender evidence of payment of the assessments, taxes, charges, levies,
     liens and claims and will authorize the appropriate governmental official
     to deliver to Lender at any time a written statement of any assessments,
     taxes, charges, levies, liens and claims against Borrower's properties,
     income, or profits.

     Performance. Perform and comply with all terms, conditions, and provisions
     set forth in this Agreement and in the Related Documents in a timely
     manner, and promptly notify Lender if Borrower learns of the occurrence of
     any event which constitutes an Event of Default under this Agreement or
     under any of the Related Documents.

     Operations. Maintain executive and management personnel with substantially
     the same qualifications and experience as the present executive and
     management personnel; provide written notice to Lender of any change in
     executive and management personnel; conduct its business affairs in a
     reasonable and prudent manner and in compliance with all applicable
     federal, state and municipal laws, ordinances, rules and regulations
     respecting its properties, charters, businesses and operations, including
     without limitation; compliance with the Americans With Disabilities Act and
     with all minimum funding standards and other requirements of ERISA and
     other laws applicable to Borrower's employee benefit plans.

     Inspection. Permit employees or agents of Lender at any reasonable time to
     inspect any and all Collateral for the Loan or Loans and Borrower's other
     properties and to examine or audit Borrower's books, accounts, and records
     and to make copies and memoranda of Borrower's books, accounts, and
     records. If Borrower now or at any time hereafter maintains any records
     (including without limitation computer generated records and computer
     software programs for the generation of such records) in the possession of
     a third party, Borrower, upon request of Lender, shall notify such party to
     permit Lender free access to such records at all reasonable times and to
     provide Lender with copies of any records it may request, all at Borrower's
     expense.

     Compliance Certificate. Unless waived in writing by Lender, provide Lender
     NOT REQUIRED and at the time of each disbursement of Loan proceeds with a
     certificate executed by Borrower's chief financial officer, or other
     officer or person acceptable to Lender, certifying that the representations
     and warranties set forth in this Agreement are true and correct as of the
     date of the certificate and further certifying that, as of the date of the
     certificate, no Event of Default exists under this Agreement.

     Environmental Compliance and Reports. Borrower shall comply in all respects
     with all environmental protection federal, state and local laws, statutes,
     regulations and ordinances; not cause or permit to exist, as a result of an
     intentional or unintentional action or omission on its part or on the part
     of any third party, on property owned and/or occupied by Borrower, any
     environmental activity where damage may result to the environment, unless
     such environmental activity is pursuant to and in compliance with the
     conditions of a permit issued by the appropriate federal, state or local
     governmental authorities; shall furnish to Lender promptly and in any event
     within thirty (30) days after receipt thereof a copy of any notice,
     summons, lien, citation, directive, letter or other communication from any
     governmental agency or instrumentality concerning any intentional or
     unintentional action or omission on Borrower's part in connection with any
     environmental activity whether or not there is damage to the environment
     and/or other natural resources.

     Additional Assurances. Make, execute and deliver to Lender such promissory
     notes, mortgages, deeds of trust, security agreements, financing
     statements, instruments, documents and other agreements as Lender or its
     attorneys may reasonably request to evidence and secure the Loans and to
     perfect all Security Interests.

NEGATIVE COVENANTS. Borrower covenants and agrees with Lender that while this
Agreement is in effect, Borrower shall not, without the prior written consent of
Lender:

     Indebtedness and Liens. (a) Except for trade debt incurred in the normal
     course of business and indebtedness to Lender contemplated by this
     Agreement, create, incur or assume indebtedness for borrowed money,
     including capital leases, (b) except as allowed as a Permitted Lien, sell,
     transfer, mortgage, assign, pledge, lease, grant a security interest in, or
     encumber any of Borrower's assets, or (c) sell with recourse any of
     Borrower's accounts, except to Lender.

     Continuity of Operations. (a) Engage in any business activities
     substantially different than those in which Borrower is presently engaged,
     (b) cease operations, liquidate, merge, transfer, acquire or consolidate
     with any other entity, change ownership, change its name, dissolve or
     transfer or sell Collateral out of the ordinary course of business, (c) pay
     any dividends on Borrower's stock (other than dividends payable in its
     stock), provided, however that notwithstanding the foregoing, but only so
     long as no Event of Default has occurred and is continuing or would result
     from the payment of dividends, if Borrower is a "Subchapter S Corporation"
     (as defined in the Internal Revenue Cede of 1986, as amended), Borrower may
     pay cash dividends on its stock to its shareholders from time to time in
     amounts necessary to enable the shareholders to pay income taxes and make
     estimated income tax payments to satisfy their liabilities under federal
     and state law which arise solely from their status as Shareholders of a
     Subchapter S Corporation because of their ownership of shares of stock of
     Borrower, or (d) purchase or retire any of Borrower's outstanding shares or
     alter or amend Borrower's capital structure.

     Loans, Acquisitions and Guaranties. (a) Loan, invest in or advance money or
     assets, (b) purchase, create or acquire any interest in any other
     enterprise or entity, or (c) incur any obligation as surety or guarantor
     other than in the ordinary course of business.

CESSATION OF ADVANCES. If Lender has made any commitment to make any Loon to
Borrower, whether under this Agreement or under any other agreement, Lender
shall have no obligation to make Loan Advances or to disburse Loon proceeds if:
(a) Borrower or any Guarantor is in default under the terms of this Agreement or
any of the Related Documents or any other agreement that Borrower or any
Guarantor has with Lender; (b) Borrower or any Guarantor becomes insolvent,
files a petition in bankruptcy or similar proceedings, or is adjudged a
bankrupt; (c) there occurs a material adverse change in Borrower's financial
condition, in the financial condition of any Guarantor, or in the value of any
Collateral securing any Loon; (d) any Guarantor seeks, claims or otherwise
attempts to limit, modify or revoke such Guarantor's guaranty of the Loan or any
other loon with Lender; or (e) Lender in good faith deems itself insecure, even
though no Event of Default shall have occurred.
<PAGE>

08-15-1999                  BUSINESS LOAN AGREEMENT                       Page 4
Loan No 733/18                    (Continued)

================================================================================
YEAR 2000. Borrower has reviewed and assessed its business operations and
computer systems and applications to address the "year 2000 problem" (that is,
that computer applications and equipment used by Borrower, directly or
indirectly through third parties, may be unable to properly perform date-
sensitive functions before, during and after January 1, 2000). Borrower
reasonably believes that the year 2000 problem will not result in a material
adverse change in Borrower's business condition (financial or otherwise),
operations, properties or prospects or ability to repay Lender. Borrower agrees
that this representation will be true and correct on and shall be deemed made by
Borrower on each date Borrower requests any advance under this Agreement or Note
or delivers any information to Lender. Borrower will promptly deliver to Lender
such information relating to this representation as Lender requests from time to
time.

DISCLOSURE. ORAL AGREEMENTS OR COMMITMENTS TO LOAN MONEY, EXTEND CREDIT, OR
FORBEAR FROM ENFORCING REPAYMENT OF A DEBT ARE NOT ENFORCEABLE UNDER WASHINGTON
LAW.

ACCESS LAWS. Without limiting the generality of any provision of this agreement
requiring Borrower to comply with applicable laws, rules and regulations,
Borrower agrees that it will at all times comply with applicable laws relating
to disabled access including, but not limited to, all applicable titles of the
Americans with Disabilities Act of 1990.

REPORTING REQUIREMENTS. Borrower covenants and agrees with Lender that, while
this Agreement is in effect, they will furnish to Lender the following;.
(1) As soon as available, but in no event later than ninety (90) days after the
end of each year, Form 10K CPA audited financial statement for such yearly
period.
(2) As soon as available, but in no event later than sixty (60) days after the
end of each quarter, Form 10Q for such quarterly period.

RIGHT OF SETOFF. Borrower grants to Lender a contractual security interest in,
and hereby assigns, conveys, delivers, pledges, and transfers to Lender all
Borrower's right, title and interest in and to, Borrower's accounts with Lender
(whether checking, savings, or some other account), including without limitation
all accounts held jointly with someone else and all accounts Borrower may open
in the future, excluding however all IRA and Keogh accounts, and all trust
accounts for which the grant of a security interest would be prohibited by law.
Borrower authorizes Lender, to the extent permitted by applicable law, to charge
or setoff all sums owing on the Indebtedness against any and all such accounts,
and, at Lender's option, to administratively freeze all such accounts to allow
Lender to protect Lender's charge and setoff rights provided on this paragraph.

EVENTS OF DEFAULT. Each of the following shall constitute an Event of Default
under this Agreement:

     Default on Indebtedness. Failure of Borrower to make any payment when due
     on the Loans.

     Other Defaults. Failure of Borrower or any Grantor to comply with or to
     perform when due any other term, obligation, covenant or condition
     contained in this Agreement or in any of the Related Documents, or failure
     of Borrower to comply with or to perform any other term, obligation,
     covenant or condition contained in any other agreement between Lender and
     Borrower.

     Default In Favor of Third Parties. Should Borrower or any Grantor default
     under any loan, extension of credit, security agreement, purchase or sales
     agreement, or any other agreement, in favor of any other creditor or person
     that may materially affect any of Borrower's property or Borrower's or any
     Grantor's ability to repay the Loans or perform their respective
     obligations under this Agreement or any of the Related Documents.

     False Statements. Any warranty, representation or statement made or
     furnished to Lender by or on behalf of Borrower or any Grantor under this
     Agreement or the Related Documents is false or misleading in any material
     respect at the time made or furnished, or becomes false or misleading at
     any time thereafter.

     Defective Collateralization. This Agreement or any of the Related Documents
     ceases to be in full force and effect (including failure of any Security
     Agreement to create a valid and perfected Security Interest) at any time
     and for any reason.

     Insolvency. The dissolution or termination of Borrower's existence as a
     going business, the insolvency of Borrower, the appointment of a receiver
     for any part of Borrower's property, any assignment for the benefit of
     creditors, any type of creditor workout, or the commencement of any
     proceeding under any bankruptcy or insolvency laws by or against Borrower.

     Creditor or Forfeiture Proceedings. Commencement of foreclosure or
     forfeiture proceedings, whether by judicial proceeding, self-help,
     repossession or any other method, by any creditor of Borrower, any creditor
     of any Grantor against any collateral securing the Indebtedness, or by any
     governmental agency. This includes a garnishment, attachment, or levy on or
     of any of Borrower's deposit accounts with Lender.

     Events Affecting Guarantor. Any of the preceding events occurs with respect
     to any Guarantor of any of the Indebtedness or any Guarantor dies or
     becomes incompetent, or revokes or disputes the validity of, or liability
     under, any Guaranty of the Indebtedness.

     Change In Ownership. Any change in ownership of twenty-five percent (25%)
     or more of the common stock of Borrower.

     Adverse Change. A material adverse change occurs in Borrower's financial
     condition, or Lender believes the prospect of payment or performance of the
     Indebtedness is impaired.

     Insecurity. Lender, in good faith, deems itself insecure.

EFFECT OF AN EVENT OF DEFAULT. If any Event of Default shall occur, except where
otherwise provided in this Agreement or the Related Documents, all commitments
and obligations of Lender under this Agreement or the Related Documents or any
other agreement immediately will terminate (including any obligation to make
Loan Advances or disbursements), and, at Lender's option, all Indebtedness
immediately will become due and payable, all without notice of any kind to
Borrower, except that in the case of an Event of Default of the type described
in the "Insolvency" subsection above, such acceleration shall be automatic and
not optional. In addition, Lender shall have all the rights and remedies
provided in the Related Documents or available at law, in equity, or otherwise.
Except as may be prohibited by applicable law, all of Lender's rights and
remedies shall be cumulative and may be exercised singularly or concurrently.
Election by Lender to pursue any remedy shall not exclude pursuit of any other
remedy, and an election to make expenditures or to take action to perform an
obligation of Borrower or of any Grantor shall not affect Lender's right to
declare a default and to exercise its rights and remedies.

MISCELLANEOUS PROVISIONS. The following miscellaneous provisions are a part of
this Agreement:

     Amendments. This Agreement, together with any Related Documents,
     constitutes the entire understanding and agreement of the parties as to the
     matters set forth in this Agreement. No alteration of or amendment to this
     Agreement shall be effective unless given in writing and signed by the
     party or parties sought to be charged or bound by the alteration or
     amendment.

     Applicable Law. This Agreement has been delivered to Lender and accepted by
     Lender In the State of Washington. If there Is a lawsuit, Borrower agrees
     upon Lender's request to submit to the jurisdiction of the courts of King
     County, the State of Washington. Subject to the provisions on arbitration,
     this Agreement shall be governed by and construed In accordance with the
     laws of the State of Washington.

     Arbitration. Lender and Borrower agree that all disputes, claims and
     controversies between them, whether Individual, Joint, or class In nature,
     arising from this Agreement or otherwise, including without limitation
     contract and tort disputes, shall be arbitrated pursuant to the Rules of
     the American Arbitration Association, upon request of either party. No act
     to take or dispose of any Collateral shall constitute a waiver of this
     arbitration agreement or be prohibited by this arbitration agreement. This
     includes, without limitation, obtaining injunctive relief or a temporary
     restraining order; invoking a power of sale under any deed of trust or
     mortgage; obtaining a writ of attachment or imposition of a receiver; or
     exercising any rights relating to personal property, including taking or
     disposing of such property with or without judicial process pursuant to
     Article 9 of the Uniform Commercial Code. Any disputes, claims, or
     controversies concerning the lawfulness or reasonableness of any act, or
     exercise of any right, concerning any Collateral, including any claim to
     rescind, reform, or otherwise modify any agreement relating to the
     Collateral, shall also be arbitrated, provided however that no arbitrator
     shall have the right or the power to enjoin or restrain any act of any
     party. Judgment upon any award rendered by any arbitrator may be entered in
     any court having jurisdiction. Nothing in this Agreement shall preclude any
     party from seeking equitable relief from a court of competent jurisdiction.
     The statute of limitations, estoppel, waiver, laches, and similar doctrines
     which would otherwise be applicable in an action brought by a party shall
     be applicable in any arbitration proceeding, and the commencement of an
     arbitration proceeding shall be deemed the commencement of an action for
     these purposes. The Federal Arbitration Act shall apply to the
     construction, interpretation, and enforcement of this arbitration
     provision.

     Caption Headings. Caption headings in this Agreement are for convenience
     purposes only and are not to be used to interpret or define the provisions
     of this Agreement.

     Multiple Parties; Corporate Authority. All obligations of Borrower under
     this Agreement shall be joint and several, and all references to Borrower
     shall mean each and every Borrower. This means that each of the persons
     signing below is responsible for all obligations in this Agreement.

     Consent to Loan Participation. Borrower agrees and consents to Lender's
     sate or transfer, whether now or later, of one or more participation
     interests in the Loans to one or more purchasers, whether related or
     unrelated to Lender. Lender may provide, without any limitation whatsoever,
     to any one or more purchasers, or potential purchasers, any information or
     knowledge Lender may have about Borrower or about any other matter relating
     to the Loan, and Borrower hereby waives any rights to privacy it may have
     with respect to such matters. Borrower additionally waives any and all
     notices of sale of participation interests, as well as all notices of any
     repurchase of such participation interests. Borrower also agrees that the
     purchasers of any such participation interests will be considered as the
     absolute owners of such interests in the Loans and will have all the rights
     granted under the participation agreement or agreements governing the sale
     of such participation interests. Borrower further waives all rights of
     offset or counterclaim that it may have now or later against Lender or
     against any purchaser of such a participation interest and
<PAGE>

08-15-1999                  BUSINESS LOAN AGREEMENT                       Page 5
Loan No 733/18                    (Continued)

================================================================================
     unconditionally agrees that either Lender or such purchaser may enforce
     Borrower's obligation under the Loans irrespective of the failure or
     insolvency of any holder of any interest in the Loans. Borrower further
     agrees that the purchaser of any such participation interests may enforce
     its interests irrespective of any personal claims or defenses that Borrower
     may have against Lender.

     Costs and Expenses. Borrower agrees to pay upon demand all of Lender's
     expenses, including without limitation attorneys' fees, incurred in
     connection with the preparation, execution, enforcement, modification and
     collection of this Agreement or in connection with the Loans made pursuant
     to this Agreement. Lender may pay someone else to help collect the Loans
     and to enforce this Agreement, and Borrower will pay that amount. This
     includes, subject to any limits under applicable law, Lender's attorneys'
     fees and Lender's legal expenses, whether or not there is a lawsuit,
     including attorneys' fees for bankruptcy proceedings (including efforts to
     modify or vacate any automatic stay or injunction), appeals, and any
     anticipated post-judgment collection services. Borrower also will pay any
     court costs, in addition to all other sums provided by law.

     Notices. All notices required to be given under this Agreement shall be
     given in writing, may be sent by telefacsimile (unless otherwise required
     by law), and shall be effective when actually delivered or when deposited
     with a nationally recognized overnight courier or deposited in the United
     States mail, first class, postage prepaid, addressed to the party to whom
     the notice is to be given at the address shown above. Any party may change
     its address for notices under this Agreement by giving formal written
     notice to the other parties, specifying that the purpose of the notice is
     to change the party's address. To the extent permitted by applicable law,
     if there is more than one Borrower, notice to any Borrower will constitute
     notice to all Borrowers. For notice purposes, Borrower will keep Lender
     informed at all times of Borrower's current address(es).

     Severability. If a court of competent jurisdiction finds any provision of
     this Agreement to be invalid or unenforceable as to any person or
     circumstance, such finding shall not render that provision invalid or
     unenforceable as to any other persons or circumstances. If feasible, any
     such offending provision shall be deemed to be modified to be within the
     limits of enforceability or validity; however, if the offending provision
     cannot be so modified, it shall be stricken and all other provisions of
     this Agreement in all other respects shall remain valid and enforceable.

     Subsidiaries and Affiliates of Borrower. To the extent the context of any
     provisions of this Agreement makes it appropriate, including without
     limitation any representation, warranty or covenant, the word "Borrower" as
     used herein shall include all subsidiaries and affiliates of Borrower.
     Notwithstanding the foregoing however, under no circumstances shall this
     Agreement be construed to require Lender to make any Loan or other
     financial accommodation to any subsidiary or affiliate of Borrower.

     Successors and Assigns. All covenants and agreements contained by or on
     behalf of Borrower shall bind its successors and assigns and shall inure to
     the benefit of Lender, its successors and assigns. Borrower shall not,
     however, have the right to assign its rights under this Agreement or any
     interest therein, without the prior written consent of Lender.

     Survival. All warranties, representations, and covenants made by Borrower
     in this Agreement or in any certificate or other instrument delivered by
     Borrower to Lender under this Agreement shall be considered to have been
     relied upon by Lender and will survive the making of the Loan and deliver
     to Lender of the Related Documents, regardless of any investigation made by
     Lender or on Lender's behalf.

     Waiver. Lender shall not be deemed to have waived any rights under this
     Agreement unless such waiver is given in writing and signed by Lender. No
     delay or omission on the part of Lender in exercising any right shall
     operate as a waiver of such right or any other right. A waiver by Lender of
     a provision of this Agreement shall not prejudice or constitute a waiver of
     Lender's right otherwise to demand strict compliance with that provision or
     any other provision of this Agreement. No prior waiver by Lender, nor any
     course of dealing between Lender and Borrower, or between Lender and any
     Grantor, shall constitute a waiver of any of Lender's rights or of any
     obligations of Borrower or of any Grantor as to any future transactions.
     Whenever the consent of Lender is required under this Agreement, the
     granting of such consent by Lender in any instance shall not constitute
     continuing consent in subsequent instances where such consent is required,
     and in all cases such consent may be granted or withheld in the sole
     discretion of Lender.

BORROWER ACKNOWLEDGES HAVING READ ALL THE PROVISIONS OF THIS BUSINESS LOAN
AGREEMENT, AND BORROWER AGREES TO ITS TERMS. THIS AGREEMENT IS DATED AS OF
AUGUST 15, 1999.

BORROWER:
AVT CORPORATION

By:  /s/ Roger A. Fukai    Executive V.P. & CFO
     ------------------------------------------
     AUTHORIZED OFFICER    TITLE

LENDER:
U.S. Bank National Association

By:____________________________________________
   Authorized Officer

================================================================================
<PAGE>

                           ALTERNATIVE RATE OPTIONS
                                PROMISSORY NOTE
                              (PRIME RATE, LIBOR)

$4,000,000.00                 Dated as of: AUGUST 15, 1999
-------------                              ---------------

AVT CORPORATION                                                     ("Borrower")
-------------------------------------------------------------------

U.S. BANK NATIONAL ASSOCIATION                                      ("Lender")

1.    TYPE OF CREDIT. This note is given to evidence Borrower's obligation to
repay all sums which Lender may from time to time advance to Borrower
("Advances") under a:

  [_] single disbursement loan. Amounts loaned to Borrower hereunder will be
disbursed in a single Advance in the amount shown in Section 2.

  [X] revolving line of credit. No Advances shall be made which create a maximum
      amount outstanding at any one time which exceeds the maximum amount shown
      in Section 2. However, Advances hereunder may be borrowed, repaid and
      reborrowed, and the aggregate Advances loaned hereunder from time to time
      may exceed such maximum amount.

  [_] non-revolving line of credit. Each Advance made from time to time
      hereunder shall reduce the maximum amount available shown in Section 2.
      Advances loaned hereunder which are repaid may not be reborrowed.

2.    PRINCIPAL BALANCE. The unpaid principal balance of all Advances
outstanding under this note ("Principal Balance") at one time shall not exceed
$4,000,000.00.
-------------

3.    PROMISE TO PAY. For value received Borrower promises to pay to Lender or
order at 555 SW OAK, PL-7, PORTLAND, OR 97204, the Principal Balance of this
         ------------------------------------
note, with interest thereon at the rate(s) specified in Sections 4 and 11 below.

4.    INTEREST RATE. The interest rate on the Principal Balance outstanding may
vary from time to time pursuant to the provisions of this note. Subject to the
provisions of this note, Borrower shall have the option from time to time of
choosing to pay interest at the rate or rates and for the applicable periods of
time based on the rate options provided herein; provided, however, that once
                                                --------
Borrower notifies Lender of the rate option chosen in accordance with the
provisions of this note, such notice shall be irrevocable. The rate options are
the Prime Borrowing Rate and the LIBOR Borrowing Rate, each as defined herein.

(a)   Definitions. The following terms shall have the following meanings:

            "Business Day'' means any day other than a Saturday, Sunday, or
other day that commercial banks in Portland, Oregon or New York City are
authorized or required by law to close; provided, however that when used in
connection with a LIBOR Rate, LIBOR Amount or LIBOR interest Period such term
shall also exclude any day on which dealings in U.S. dollar deposits are not
carried on in the London interbank market.

            "LIBOR Amount" means each principal amount for which Borrower
chooses to have the LIBOR Borrowing Rate apply for any specified LIBOR Interest
Period.

            "LIBOR Interest Period" means as to any LIBOR Amount, a period of 1,
                                                                              --
2, 3 and 6 months commencing on the date the LIBOR Borrowing Rate becomes
----------
applicable thereto; provided, however, that: (i) the first day of each LIBOR
                    --------
Interest Period must be a Business Day; (ii) no LIBOR Interest Period shall be
selected which would extend beyond August 15, 2001  ; (iii) no LIBOR Interest
                                   ---------------
Period shall extend beyond the date of any principal payment required under
Section 6 of this note, unless the sum of the Prime Rate Amount, plus LIBOR
Amounts with LIBOR Interest Periods ending on or before the scheduled date of
such principal payment, plus principal amounts remaining unborrowed under a line
of credit, equals or exceeds the amount of such principal payment; (iv) any
LIBOR Interest Period which would otherwise expire on a day which is not a
Business Day, shall be extended to the next succeeding Business Day, unless the
result of such extension would be to extend such LIBOR Interest Period into
another calendar month, in which event the LIBOR Interest Period shall end on
the immediately preceding Business Day; and (v) any LIBOR Interest Period that
begins on the last Business Day of a calendar month (or on a day for which there
is no numerically corresponding day in the calendar month at the end of such
LIBOR Interest Period) shall end on the last Business Day of a calendar month.

            "LIBOR Rate" means, for any LIBOR Interest Period, the rate per
annum (computed on the basis of a 360-day year and the actual number of days
elapsed and rounded upward to the nearest 1/16 of 1%) established by Lender as
its LIBOR Rate, based on Lender's determination, on the basis of such factors as
Lender deems relevant, of the rate of interest at which U.S. dollar deposits
would be offered to U.S. Bank National Association in the London interbank
market at approximately 11 a.m. London time on the date which is two Business
Days prior to the first day of such LIBOR Interest Period for delivery on the
first day of such LIBOR Interest Period for the number of months therein;
provided, however, that the LIBOR Rate shall be adjusted to take into account
the maximum reserves required to be maintained for Eurocurrency liabilities by
banks during each such LIBOR Interest Period as specified in Regulation D of the
Board of Governors of the Federal Reserve System or any successor regulation.

            "Prime Rate" means the rate of interest which Lender from time to
time establishes as its prime rate and is not, for example, the lowest rate of
interest which Lender collects from any borrower or class of borrowers. When the
Prime Rate is applicable under Section 4(b) or 11 (b), the interest rate
hereunder shall be adjusted without notice effective on the day the Prime Rate
changes, but in no event shall the rate of interest be higher than allowed by
law.

            "Prime Rate Amount" means any portion of the Principal Balance
bearing interest at the Prime Borrowing Rate.

(b)   The Prime Borrowing Rate.

      (i)   The Prime Borrowing Rate is a per annum rate equal to the Prime Rate
  plus 0.000 % per annum.
       -------

      (ii)  Whenever Borrower desires to use the Prime Borrowing Rate option,
Borrower shall give Lender notice orally or in writing in accordance with
Section 15 of this note, which notice shall specify the requested effective date
(which must be a Business Day) and principal amount of the Advance or increase
in the Prime Rate Amount, and whether Borrower is requesting a new Advance under
a line of credit or conversion of a LIBOR Amount to the Prime Borrowing Rate.

      (iii) Subject to Section 11 of this note, interest shall accrue on the
unpaid Principal Balance at the Prime Borrowing Rate unless and except to the
extent that the LIBOR Borrowing Rate is in effect.

(c)   The LIBOR Borrowing Rate.

      (i)   The LIBOR Borrowing Rate is the LIBOR Rate plus 1.500% per annum.
                                                            ------

      (ii)  Borrower may obtain LIBOR Borrowing Rate quotes from Lender between
8:00 a.m. and 10:00 a.m. (Portland, Oregon time) on any Business Day. Borrower
may request an Advance, conversion of any portion of the Prime Rate Amount to a
LIBOR Amount or a new LIBOR Interest Period for an existing LIBOR Amount, at
such rate only by giving Lender notice in accordance with Section 4 (c) (iii)
before 10:00 a.m. (Portland, Oregon time) on such day.

      (iii) Whenever Borrower desires to use the LIBOR Borrowing Rate option,
Borrower shall give Lender irrevocable notice (either in writing or orally and
promptly confirmed in writing) between 8:00 a.m. and 10:00 a.m. (Portland,
Oregon time) two (2) Business Days prior to the desired effective date of such

                                                                     Page 1 of 4
<PAGE>

rate. Any oral notice shall be given by, and any written notice or confirmation
of an oral notice shall be signed by, the person(s) authorized in Section 15 of
this note, and shall specify the requested effective date of the rate, LIBOR
Interest Period and LIBOR Amount, and whether Borrower is requesting a new
Advance at the LIBOR Borrowing Rate under a line of credit, conversion of all or
any portion of the Prime Rate Amount to a LIBOR Amount, or a new LIBOR Interest
Period for an outstanding LIBOR Amount. Notwithstanding any other term of this
note, Borrower may elect the LIBOR Borrowing Rate in the minimum principal
amount of $100,000.00 and in multiples of any amount above such amount;
          -----------                     ----------
provided, however, that no more than forty separate LIBOR Interest Periods may
--------                             -----
be in effect at any one time.

     (iv)    If at any time the LIBOR Rate is unascertainable or unavailable to
Lender or if LIBOR Rate loans become unlawful, the option to select the LIBOR
Borrowing Rate shall terminate immediately. If the LIBOR Borrowing Rate is then
in effect, (A) it shall terminate automatically with respect to all LIBOR
Amounts (i) on the last day of each then applicable LIBOR Interest Period, if
Lender may lawfully continue to maintain such loans, or (ii) immediately if
Lender may not lawfully continue to maintain such loans through such day, and
(B) subject to Section 11, the Prime Borrowing Rate automatically shall become
effective as to such amounts upon such termination.

     (v)     If at any time after the date hereof (A) any revision in or
adoption of any applicable law, rule, or regulation or in the interpretation or
administration thereof (i) shall subject Lender or its Eurodollar lending office
to any tax, duty, or other charge, or change the basis of taxation of payments
to Lender with respect to any loans bearing interest based on the LIBOR Rate, or
(ii) shall impose or modify any reserve, insurance, special deposit, or similar
requirements against assets of, deposits with or for the account of, or credit
extended by Lender or its Eurodollar lending office, or impose on Lender or its
Eurodollar lending office any other condition affecting any such loans, and (B)
the result of any of the foregoing is (i) to increase the cost to Lender of
making or maintaining any such loans or (ii) to reduce the amount of any sum
receivable under this note by Lender or its Eurodollar lending office, Borrower
shall pay Lender within 15 days after demand by Lender such additional amount as
will compensate Lender for such increased cost or reduction. The determination
hereunder by Lender of such additional amount shall be conclusive in the absence
of manifest error. If Lender demands compensation under this Section 4(c)(v),
Borrower may upon three (3) Business Days' notice to Lender pay the accrued
interest on all LIBOR Amounts, together with any additional amounts payable
under Section 4(c)(vi). Subject to Section 11, upon Borrower's paying such
accrued interest and additional costs, the Prime Borrowing Rate immediately
shall be effective with respect to the unpaid principal balance of such LIBOR
Amounts.

     (vi)    Borrower shall pay to Lender, on demand, such amount as Lender
reasonably determines (determined as though 100% of the applicable LIBOR Amount
had been funded in the London interbank market) is necessary to compensate
Lender for any direct or indirect losses, expenses, liabilities, costs, expenses
or reductions in yield to Lender, whether incurred in connection with
liquidation or re-employment of funds or otherwise, incurred or sustained by
Lender as a result of: (A) Any payment or prepayment of a LIBOR Amount,
termination of the LIBOR Borrowing Rate or conversion of a LIBOR Amount to the
Prime Borrowing Rate on a day other than the last day of the applicable LIBOR
Interest Period (including as a result of acceleration or a notice pursuant to
Section 4(c)(v)); or (B) Any failure of Borrower to borrow, continue or prepay
any LIBOR Amount or to convert any portion of the Prime Rate Amount to a LIBOR
Amount after Borrower has given a notice thereof to Lender.

     (vii)   If Borrower chooses the LIBOR Borrowing Rate, Borrower shall pay
interest based on such rate, plus any other applicable taxes or charges
hereunder, even though Lender may have obtained the funds loaned to Borrower
from sources other than the London interbank market. Lender's determination of
the LIBOR Borrowing Rate and any such taxes or charges shall be conclusive in
the absence of manifest error.

     (viii)  Notwithstanding any other term of this note, Borrower may not
select the LIBOR Borrowing Rate if an event of default hereunder has occurred
and is continuing.

     (ix)    Nothing contained in this note, including without limitation the
determination of any LIBOR Interest Period or Lender's quotation of any LIBOR
Borrowing Rate, shall be construed to prejudice Lender's right, if any, to
decline to make any requested Advance or to require payment on demand.

5.   COMPUTATION OF INTEREST. All interest under Section 4 and Section 11 will
be computed at the applicable rate based on a 360-day year and applied to the
actual number of days elapsed.

6.   PAYMENT SCHEDULE.

(a)  Principal. Principal shall be paid:

     [_]     on demand.
     [X]     on demand, or if no demand, on August 15, 2001.
                                            ---------------
     [_]     on ____.
     [_]     subject to Section 8, in installments of
             [_]    ____ each, plus accrued interest, beginning on ____ and on
                    the same day of each ____ thereafter until ____ when the
                    entire Principal Balance plus interest thereon shall be due
                    and payable.
             [_]    ____ each, including accrued interest, beginning on ____ and
                    on the same day of each ____ thereafter until ____ when the
                    entire Principal Balance plus interest thereon shall be due
                    and payable.
     [_]     ____

(b)  Interest.

     (i)     Interest on the Prime Rate Amount shall be paid:

             [X]    on the 15th day of September, 1999 and on the same day of
                           ----        ---------------
                    each month, thereafter prior to maturity and at maturity.
                         -----
             [_]    at maturity.
             [_]    at the time each principal installment is due and at
                    maturity.
             [_]    ____.

     (ii)    Interest on all LIBOR Amounts shall be paid:

             [_]    on the last day of the applicable LIBOR Interest Period, and
                    if such LIBOR Interest Period is longer than three months,
                    on the last day of each three month period occurring during
                    such LIBOR Interest Period, and at maturity.
             [X]    on the 15th day of September, 1999 and on the same day of
                           ----        ---------------
                    each month thereafter prior to maturity and at maturity.
                         -----
             [_]    at maturity.
             [_]    at the time each principal installment is due and at
                    maturity.
             [_]    ____.

7.   PREPAYMENT.

(a)  Prepayments of all or any part of the Prime Rate Amount may be made at any
     time without penalty.
(b)  Except as otherwise specifically set forth herein, Borrower may not prepay
     all or any part of any LIBOR Amount or terminate any LIBOR Borrowing Rate,
     except on the last day of the applicable LIBOR Interest Period.
(c)  Principal prepayments will not postpone the date of or change the amount of
     any regularly scheduled payment. At the time of any principal prepayment,
     all accrued interest, fees, costs and expenses shall also be paid.

8.   CHANGE IN PAYMENT AMOUNT. Each time the interest rate on this note changes
the holder of this note may, from time to time, in holder's sole discretion,
increase or decrease the amount of each of the installments remaining unpaid at
the time of such change in rate to an amount holder in its sole discretion deems
necessary to continue amortizing the Principal Balance at the same rate
established by the installment amounts specified in Section 6(a),

                                                                     Page 2 of 3
<PAGE>

whether or not a "balloon" payment may also be due upon maturity of this note.
Holder shall notify the undersigned of each such change in writing. Whether or
not the installment amount is increased under this Section 8, Borrower
understands that, as a result of increases in the rate of interest the final
payment due, whether or not a "balloon" payment, shall include the entire
Principal Balance and interest thereon then outstanding, and may be
substantially more than the installment specified in Section 6.

9.   ALTERNATE PAYMENT DATE. Notwithstanding any other term of this note, if in
any month there is no day on which a scheduled payment would otherwise be due
(e.g. February 31), such payment shall be paid on the last banking day of that
month.

10.  PAYMENT BY AUTOMATIC DEBIT.

[_]  Borrower hereby authorizes Lender to automatically deduct the amount of all
principal and interest payments from account number ____. If there are
insufficient funds in the account to pay the automatic deduction in full, Lender
may allow the account to become overdrawn, or Lender may reverse the automatic
deduction. Borrower will pay all the fees on the account which result from the
automatic deductions, including any overdraft and non-sufficient funds charges.
If for any reason Lender does not charge the account for a payment, or if an
automatic payment is reversed, the payment is still due according to this note.
If the account is a Money Market Account, the number of withdrawals from that
account is limited as set out in the account agreement. Lender may cancel the
automatic deduction at any time in its discretion.

Provided, however, if no account number is entered above, Borrower does not want
to make payments by automatic debit.

11.  DEFAULT.

(a)  Without prejudice to any right of Lender to require payment on demand or to
decline to make any requested Advance, each of the following shall be an event
of default: (i) Borrower fails to make any payment when due. (ii) Borrower fails
to perform or comply with any term, covenant or obligation in this note or any
agreement related to this note, or in any other agreement or loan Borrower has
with Lender. (iii) Borrower defaults under any loan, extension of credit,
security agreement, purchase or sales agreement, or any other agreement, in
favor of any other creditor or person that may materially affect any of
Borrower's property or Borrower's ability to repay this note or perform
Borrower's obligations under this note or any related documents. (iv) Any
representation or statement made or furnished to Lender by Borrower or on
Borrower's behalf is false or misleading in any material respect either now or
at the time made or furnished. (v) Borrower dies, becomes insolvent, liquidates
or dissolves, a receiver is appointed for any part of Borrower's property,
Borrower makes an assignment for the benefit of creditors, or any proceeding is
commenced either by Borrower or against Borrower under any bankruptcy or
insolvency laws. (vi) Any creditor tries to take any of Borrower's property on
or in which Lender has a lien or security interest. This includes a garnishment
of any of Borrower's accounts with Lender. (vii) Any of the events described in
this default section occurs with respect to any general partner in Borrower or
any guarantor of this note, or any guaranty of Borrower's indebtedness to Lender
ceases to be, or is asserted not to be, in full force and effect. (viii) There
is any material adverse change in the financial condition or management of
Borrower or Lender in good faith deems itself insecure with respect to the
payment or performance of Borrower's obligations to Lender. If this note is
payable on demand, the inclusion of specific events of default shall not
prejudice Lender's right to require payment on demand or to decline to make any
requested Advance.

(b)  Without prejudice to any right of Lender to require payment on demand, upon
the occurrence of an event of default, Lender may declare the entire unpaid
Principal Balance on this note and all accrued unpaid interest immediately due
and payable, without notice. Upon default, including failure to pay upon final
maturity, Lender, at its option, may also, if permitted under applicable law,
increase the interest rate on this note to a rate equal to the Prime Borrowing
Rate plus 5%. The interest rate will not exceed the maximum rate permitted by
applicable law. in addition, if any payment of principal or interest is 19 or
more days past due, Borrower will be charged a late charge of 5% of the
delinquent payment.

12.  EVIDENCE OF PRINCIPAL BALANCE; PAYMENT ON DEMAND. Holder's records shall,
at any time, be conclusive evidence of the unpaid Principal Balance and interest
owing on this note. Notwithstanding any other provisions of this note, in the
event holder makes Advances hereunder which result in an unpaid Principal
Balance on this note which at any time exceeds the maximum amount specified in
Section 2, Borrower agrees that all such Advances, with interest, shall be
payable on demand.

13.  LINE OF CREDIT PROVISIONS. If the type of credit indicated in Section 1 is
a revolving line of credit or a non-revolving line of credit, Borrower agrees
that Lender is under no obligation and has not committed to make any Advances
hereunder. Each Advance hereunder shall be made at the sole option of Lender.

14.  DEMAND NOTE. If this note is payable on demand, Borrower acknowledges and
agrees that (a) Lender is entitled to demand Borrower's immediate payment in
full of all amounts owing hereunder and (b) neither anything to the contrary
contained herein or in any other loan documents (including but not limited to,
provisions relating to defaults, rights of cure, default rate of interest,
installment payments, late charges, periodic review of Borrower's financial
condition, and covenants) nor any act of Lender pursuant to any such provisions
shall limit or impair Lender's right or ability to require Borrower's payment in
full of all amounts owing hereunder immediately upon Lender's demand.

15.  REQUESTS FOR ADVANCES.

(a)  Advances under this Note, may be requested orally or in writing by Borrower
or by an authorized person. Lender may, but need not, require that all oral
requests be confirmed in writing. Borrower agrees to be liable for all sums
either: (a) advanced in accordance with the e instructions of an authorized
person or (b) credited to any of Borrower's accounts with Lender. The unpaid
principal balance owing on this Note at any time may be evidenced by
endorsements on this Note or by Lender's internal records, including daily
computer print-outs.

(b)  All Advances shall be disbursed by deposit directly to Borrower's account
number      , or by cashier's check issued to Borrower.

(c)  Borrower agrees that Lender shall have no obligation to verify the identity
of any person making any request pursuant to this Section 15, and Borrower
assumes all risks of the validity and authorization of such requests. In
consideration of Lender agreeing, at its sole discretion, to make Advances upon
such requests, Borrower promises to pay holder, in accordance with the
provisions of this note, the Principal Balance together with interest thereon
and other sums due hereunder, although any Advances may have been requested by a
person or persons not authorized to do so.

16.  PERIODIC REVIEW. Lender will review Borrower's credit accommodations
periodically. At the time of the review, Borrower will furnish Lender with any
additional information regarding Borrower's financial condition and business
operations that Lender requests. This information may include but is not limited
to, financial statements, tax returns, lists of assets and liabilities, agings
of receivables and payables, inventory schedules, budgets and forecasts. If upon
review, Lender, in its sole discretion, determines that there has been a
material adverse change in Borrower's financial condition, Borrower will be in
default. Upon default, Lender shall have all rights specified herein.

17.  NOTICES. Any notice hereunder may be given by ordinary mail, postage paid
and addressed to Borrower at the last known address of Borrower as shown on
holder's records. If Borrower consists of more than one person, notification of
any of said persons shall be complete notification of all.

18.  ATTORNEY FEES. Whether or not litigation or arbitration is commenced,
Borrower promises to pay all costs of collecting overdue amounts. Without
limiting the foregoing, in the event that holder consults an attorney regarding
the enforcement of any of its rights under this note or any document securing
the same, or if this note is placed in the hands of an attorney for collection
or if suit or litigation is brought to enforce this note or any document
securing the same, Borrower promises to pay all costs thereof including such
additional sums as the court or arbitrator(s) may adjudge reasonable as attorney
fees, including without limitation, costs and attorney fees incurred in any
appellate court, in any proceeding under the bankruptcy code, or in any
receivership and post-judgment attorney fees incurred in enforcing any judgment.

19.  WAIVERS; CONSENT. Each party hereto, whether maker, co-maker, guarantor or
otherwise, waives diligence, demand, presentment for payment, notice of non-
payment, protest and notice of protest and waives all defenses based on
suretyship or impairment of collateral. Without notice to Borrower and without
diminishing or affecting Lender's rights or Borrower's obligations hereunder,
Lender may deal in any manner with any person who at any time is liable for, or
provides any real or personal property collateral for, any indebtedness of
Borrower to Lender, including the indebtedness evidenced by this note. Without
limiting the foregoing, Lender may, in its sole discretion: (a) make secured or
unsecured loans to Borrower and agree to any number of waivers, modifications,
extensions and renewals of any length of such loans, including the loan
evidenced by this note; (b) impair, release (with or without substitution of new
collateral), fail to perfect a security interest in, fail to preserve the value
of, fail to dispose of in accordance with applicable law, any collateral
provided by any person; (c) sue, fail to sue, agree not to sue, release, and
settle or compromise with, any person.

                                                                     Page 3 of 3
<PAGE>

20.  JOINT AND SEVERAL LIABILITY. All undertakings of the undersigned Borrowers
are joint and several and are binding upon any marital community of which any of
the undersigned are members. Holder's rights and remedies under this note shall
be cumulative.

21.  SEVERABILITY. If any term or provision of this note is declared by a court
of competent jurisdiction to be illegal, invalid or unenforceable for any reason
whatsoever, such illegality, invalidity or unenforceability shall not affect the
balance of the terms and provisions hereof, which terms and provisions shall
remain binding and enforceable, and this note shall be construed as if such
illegal, invalid or unenforceable provision had not been contained herein.

22.  ARBITRATION.

(a)  Either Lender or Borrower may require that all disputes, claims,
counterclaims and defenses, including those based on or arising from any alleged
tort ("Claims") relating in any way to this note or any transaction of which
this note is a part (the "Loan"), be settled by binding arbitration in
accordance with the Commercial Arbitration Rules of the American Arbitration
Association and Title 9 of the U.S. Code. All Claims will be subject to the
statutes of limitation applicable if they were litigated. This provision is void
if the Loan, at the time of the proposed submission to arbitration, is secured
by real property located outside of Oregon or Washington, or if the effect of
the arbitration procedure (as opposed to any Claims of Borrower) would be to
materially impair Lender's ability to realize on any collateral securing the
Loan.

(b)  If arbitration occurs and each party's Claim is less than $100,000, one
neutral arbitrator will decide all issues; if any party's Claim is $100,000 or
more, three neutral arbitrators will decide all issues. All arbitrators will be
active Washington State Bar members in good standing. All arbitration hearings
will be held in Seattle, Washington. In addition to all other powers, the
arbitrator(s) shall have the exclusive right to determine all issues of
arbitrability. Judgment on any arbitration award may be entered in any court
with jurisdiction.

(c)  If either party institutes any judicial proceeding relating to the Loan,
such action shall not be a waiver of the right to submit any Claim to
arbitration. In addition, each has the right before, during and after any
arbitration to exercise any number of the following remedies, in any order or
concurrently: (i) setoff; (ii) self-help repossession; (iii) judicial or non-
judicial foreclosure against real or personal property collateral; and (iv)
provisional remedies, including injunction, appointment of receiver, attachment,
claim and delivery and replevin.

23.  GOVERNING LAW. This note shall be governed by and construed and enforced in
accordance with the laws of the State of Washington without regard to conflicts
of law principles; provided, however, that to the extent that Lender has greater
                   --------
rights or remedies under Federal law, this provision shall not be deemed to
deprive Lender of such rights and remedies as may be available under Federal
law.

24.  DISCLOSURE.

Oral agreements or oral commitments to loan money, extend credit, or to forebear
--------------------------------------------------------------------------------
from enforcing repayment of a debt are not enforceable under Washington law.
---------------------------------------------------------------------------

25.  RENEWAL AND EXTENSION. This Note is given in renewal and extension and not
in novation of the following described indebtedness: That certain Promissory
Note dated May 16, 1997, in the amount of $ 4,000,000.00 executed by Borrower
payable to Lender. It is further agreed that all liens and security interest
securing said indebtedness are hereby renewed and extended to secure the Note
and all renewals, extensions and modifications thereof.

26.  Year 2000. Borrower has reviewed and assessed its business operations and
computer systems and applications to address the "year 2000 problem" (that is,
that computer applications and equipment used by Borrower, directly or
indirectly through third parties, may be unable to properly perform date-
sensitive functions before, during and after January 1, 2000). Borrower
reasonably believes that the year 2000 problem will not result in a material
adverse change in Borrower's business condition (financial or otherwise),
operations, properties or prospects or ability to repay Lender. Borrower agrees
that this representation will be true and correct on and shall be deemed made by
Borrower on each date Borrower requests any advance under this Agreement or Note
or delivers any information to Lender. Borrower will promptly deliver to Lender
such information relating to this representation as Lender requests from time to
time.

EACH OF THE UNDERSIGNED HEREBY ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THIS
DOCUMENT.

AVT CORPORATION
----------------------------------------------------------
Borrower Name (Corporation Partnership or other Entity)

     /s/ Roger A. Fukai         Exec. V.P. & CFO
----------------------------------------------------------
By: AUTHORIZED OFFICER             Title:

================================================================================

For valuable consideration, Lender agrees to the terms of the arbitration
provision set forth in this note.

                              Lender Name: U.S. Bank National Association
                                           -------------------------------------

                              By:_______________________________________________

                              Title:____________________________________________

                              Date:_____________________________________________

                                                                    Page 2 of 2<PAGE>

                                                                  EXHIBIT 10.1.4

                            SEI INVESTMENTS COMPANY

                        BOARD OF DIRECTORS RESOLUTIONS

       WHEREAS, the SEI Investments Company, a Pennsylvania corporation (the
"Company"), maintains the SEI Investments Company 1998 Equity Compensation Plan
(the "Plan") for the benefit of its eligible employees, certain consultants and
advisors who perform services for the Company, and non-employee members of the
Company's Board of Directors;

       WHEREAS, the Board of Directors of the Company (the "Board") determined
at its December 20, 1999 Board meeting to amend the Plan to provide the Board
with the discretion to reduce the number of shares of the Company's common stock
("Company Stock") that are subject to the annual grant of nonqualified stock
options to non-employee directors of the Company; and

       WHEREAS, pursuant to section 16(a) of the Plan provides that, the Board
may amend the Plan at any time.

       NOW, THEREFORE, in accordance with the foregoing, the Plan shall be
amended as follows:

       The following sentence shall be added to the end of Section 6(b) of
the Plan:

               "Notwithstanding the foregoing, effective for annual grants made
               in 1999 and thereafter, the Board, in its sole discretion, may
               reduce the number of shares of Company Stock subject to the
               annual Nonqualified Stock Option grants made to the Non-Employee
               Directors, pursuant to this Section 6(b), at anytime prior to the
               grant."

      IN WITNESS WHEREOF, and as evidence of the adoption of Amendment 1999-1
set forth herein, the Board of Directors has caused this Amendment to be
executed this 9th day of March 2000.

                                                        SEI INVESTMENTS COMPANY

                                                                              65

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