[Ex 10.11(a)]


October 17, 1997

Mr. Brian V. Turner, Chief Financial Officer
RadiSys Corporation
15025 SW Koll Parkway
Beaverton, Oregon  97006-6056


Dear Brian:

I am pleased to advise you that U.S. Bank, National Association ("Bank") has
approved the renewal of the revolving line of credit and Corporate Visa facility
for RadiSys Corporation, subject to the following terms and conditions:


Borrower:           RadiSys Corporation ("RadiSys").

Operating Line of Credit
- ------------------------

Purpose:            Working Capital and general corporate purposes.

Borrowing Limit:    $10,000,000

Guarantors:         None.

Expiry Date:        September 30, 1998 or upon non-compliance with any 
                    term or condition stated herein, or any material
                    misrepresentation of fact by the Borrower.

Pricing:
           Fees:    Upfront Fee of 5 basis points ($5,000) on the 
                    committed amount due upon acceptance.

                    Quarterly fee of 1/8 of 1 percent (annualized) based 
                    upon the unused portion of the line, due quarterly 
                    in arrears.



RadiSys Corporation                                                      Page 2
October 17, 1997


  Interest Rate:    Pricing based upon U.S. Bank, National Association's
                    Prime Rate,1 Bankers' Acceptances ("BA"), or London
                    Interbank Offering Rates ("LIBOR"), at the
                    Borrower's option. The Prime Rate will be
                    fully floating and computed on a 360 day
                    year.

                    The spread over the base rates will be
                    determined quarterly by the Borrower's
                    Total Liabilities / Tangible Net Worth*
                    Ratio as expressed in the chart below. The
                    rate will be adjusted within 5 business
                    days of receipt of either the quarterly
                    10-Q report or the audited annual
                    financials.

                      Total Liabilities/Tangible Net     Prime     BA or LIBOR
                      ------------------------------     -----     -----------
                                   Worth
                                   -----

                       Greater then 0.65:1.00             + 0%        +2.00%
                       0.41:1.00 to 0.65:1.00             + 0%        +1.75%
                       0.26:1.00 to 0.40:1.00             + 0%        +1.50%
                    Less than or equal to 0.25:1.00       + 0%        +1.25%

                    B/A financing available to Borrower in minimum amount 
                    of $1,000,000 to maximum of 90 days.

                    LIBOR Terms:

                    A)   Minimum amount of $500,000 and $100,000
                         increments thereafter.

                    B)   Maturity and availability: One, two
                         or three month periods.

                    C)   Prepayment of LIBOR borrowings not permitted.

                    D)   Notification: Two day notification prior to 12:
                         00 noon on the day of notification.

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

1    If the interest rate charged to the Borrower is tied to the Prime Rate of
     U.S. Bank, Borrower is advised that U.S. Bank's Prime Rate is the rate of
     interest which the Bank from time to time identifies and publicly announces
     as its Prime Rate and is not necessarily, for example, the lowest rate of
     interest which the Bank collects from any borrower or group of borrowers.




RadiSys Corporation                                                      Page 3
October 17, 1997


                    E)   Irrevocability: Acceptance of a pricing commitment 
                         from the Bank will constitute an irrevocable agreement
                         to borrow under the revolving line of credit.

                    F)   Interest computed on the basis of a 360 day year and 
                         the number of days elapsed.

                    *    Tangible Net Worth is defined as Total Shareholder's
                         Equity less Intangibles  (e.g. Goodwill, Patents,
                         Software development costs, etc.). All other 
                         capitalized terms are defined in accordance with GAAP.

                         All reasonable out of pocket expenses for
                         documentation and collateral examination
                         fees to be paid by Borrower.

Repayment Terms:         Optional advance note.  Interest payable monthly, in
                         arrears.  Principal due at maturity.

                         Repayment of each advance received by the
                         Borrower under the line of credit is
                         subject to the terms and conditions of the
                         promissory note evidencing that advance as
                         well as all conditions of this letter. In
                         the event of any conflict between the two,
                         the terms and conditions of the promissory
                         note shall control.

     Collateral:         The revolving line of credit provides for a flexible
                         collateral position according to the following matrix.
                         The assets of the Borrower which are referenced below 
                         include accounts and inventory.


RadiSys Corporation                                                      Page 4
October 17, 1997


- --------------------------------------------------------------------------------
       Quick Ratio                                     Collateral
       -----------                                     ----------
- --------------------------------------------------------------------------------
    Greater than 1.50:1.00              Unsecured with
                                                 negative pledge agreement.
- --------------------------------------------------------------------------------
    Less than or equal to 1.50:1.00     Unsecured with negative pledge, if not
                                        borrowing, but converts to secured if 
                                        ratio falls below 1.50 benchmark for 
                                        two consecutive quarters.  If Borrowing 
                                        and equal to, or less than 1.50, then 
                                        the line of credit is secured.
- --------------------------------------------------------------------------------
    Less than or equal to 1.15:1.00     Line is secured and margined at 80%
                                        of eligible A/R**.
- --------------------------------------------------------------------------------
                 *    Quick Ratio is defined as ((Cash plus Trade Accounts
                      Receivable, Net)/(Current Liabilities))

       Advances:         Advances limited to the Borrowing Limit when Quick
                         Ratio is greater than 1.15:1.0. When Quick Ratio is 
                         less than or equal to 1.15:1.00 the advances will be 
                         limited to 80% of eligible A/R to 90 days after date 
                         of invoice. Ineligible accounts will be datings, COD 
                         or cash sales, inter-company, employee, progress 
                         billings, consignments, retainage, potential offset 
                         and accounts where more than 25% of the balance is 
                         beyond 90 days after date of invoice. Foreign accounts 
                         receivable will be considered eligible at the 
                         discretion of the Bank.

                         Disbursements under the line of credit shall terminate 
                         on the earlier occurrence of the date indicated above 
                         as the Expiry Date or the date on which this Bank, in
                         its sole discretion, determines that there has been a 
                         material adverse change in the financial condition or 
                         management of the Borrower, or determines that there 
                         has been any noncompliance with any term or 
                         condition stated herein. Noncompliance with the 
                         conditions and terms of this letter of will be 
                         considered as an event of default, entitling the Bank 
                         to all the default provisions as provided for in
                         documents evidencing this line of credit.


RadiSys Corporation                                                      Page 5
October 17, 1997


Corporate Visa Facility:
- ------------------------

Borrowing Limit:         $120,000

Terms and Conditions:    Terms as outlined in Corporate Visa agreement and
                         application.

Foreign Exchange Currency Transactions:
- ---------------------------------------

                         General Parameters:  Availability to facilitate 
                         issuance of forward and spot currency contracts.  
                         Maximum forward settlement 13 months, with the 
                         majority not to exceed March 31, 1999.  Further 
                         details are available upon request.

General Conditions:
- -------------------

Covenants:               The following covenants will be measured quarterly:

                         1.   Minimum Current Ratio:  The ratio of Current 
                              Assets to Current Liabilities not to be less than 
                              2.00 to 1.00.

                         2.   Maximum Leverage Ratio:  The ratio of Total
                              Liabilities to Tangible Net Worth not to be more 
                              than 0.75 to 1.00.

                         3.   Minimum Tangible Net Worth: Tangible Net Worth 
                              shall not be less than $48,000,000.

                         Failure to comply with any the above listed covenants 
                         constitutes an event of default under the terms of the 
                         Bank's documents.

Financial Reporting:
                         1.   Audited annual financial statements.

                         2.   Quarterly interim financial statements and all 
                              material documents filed with the SEC.

                         3.   If the Quick Ratio (as defined above) falls below 
                              1.15 to 1.00: A borrowers certificate with each 
                              advance, and a borrowers certificate to accompany
                              the monthly A/R and A/P agings. Additionally, if 
                              a Bank Collateral Survey is performed then further
                              refinement of the advance structure may be 
                              necessary.


RadiSys Corporation                                                      Page 6
October 17, 1997

Documentation:           Execution of notes, loan agreements, borrowing
                         resolutions, incumbency certificates and other 
                         documents as required by the Bank on forms prepared 
                         by the Bank.

If the above terms and conditions to extend credit to RadiSys Corporation are
acceptable to you, please sign and return the acknowledgment copy of this letter
on or before October 31, 1997.

We are pleased to provide you this borrowing accommodation and look forward to
serving your banking needs in the future.

Sincerely,

ROSS A. BEATON
- --------------
Ross A. Beaton
Vice President