<PAGE>
EXHIBIT 5.1
STOEL RIVES LLP
-------------------------------
ATTORNEYS
Standard Insurance Center
900 SW Fifth Avenue, Suite 2600
Portland, Oregon 97204-1268
Telephone (503) 224-3380
Fax (503) 220-2480
TDD (503) 221-1045
June 9, 2000
Board of Directors
RadiSys Corporation
5445 NE Dawson Creek Drive
Hillsboro, Oregon 97124
We have acted as counsel for RadiSys Corporation (the "Company") in
connection with the filing of a Registration Statement on Form S-8 (the
"Registration Statement") under the Securities Act of 1933, as amended, covering
500,000 shares of common stock (the "Shares") of the Company issuable in
connection with the Company's 1996 Employee Stock Purchase Plan, as amended (the
"Plan"). We have reviewed the corporate actions of the Company in connection
with this matter and have examined those documents, corporate records, and other
instruments we deemed necessary for the purposes of this opinion.
Based on the foregoing, it is our opinion that:
1. The Company is a corporation duly organized and validly
existing under the laws of the state of Oregon; and
2. The Shares have been duly authorized and, when issued pursuant
to the Plan and in accordance with the resolutions adopted by the Board of
Directors of the Company, will be legally issued, fully paid, and nonassessable.
We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement.
Very truly yours,
STOEL RIVES LLP
STOEL RIVES LLP