Exhibit 5

                                BAKER & MCKENZIE
                                Attorneys at Law

                            2300 Trammell Crow Center
                                2001 Ross Avenue
                               Dallas, Texas 75201

                                 June 17, 2004

Board of Directors
RadiSys Corporation
5445 NE Dawson Creek Drive
Hillsboro, Oregon 97124

Re: RadiSys Corporation (the "Company")

Gentlemen:

      The Company has filed with the Securities and Exchange Commission (the
"Commission") a registration statement (the "Registration Statement") on Form
S-8 under the Securities Act of 1933, as amended (the "Act"). The Registration
Statement covers (a) 700,000 shares of Common Stock, no par value, of the
Company (the "Stock"), which shares shall be issued pursuant to the Company's
1996 Employee Stock Purchase Plan, as amended (the "Plan"), and (b) such
additional shares of Stock as may become issuable pursuant to the anti-dilution
provisions of the Plan (such shares collectively referred to as the
"Securities").

      We have acted as counsel to the Company in connection with the preparation
and filing of the Registration Statement. In rendering this opinion we have
examined the originals, or photostatic or certified copies, of such records of
the Company, of certificates of officers of the Company and of public documents,
and such other documents as we have deemed relevant and necessary as the basis
of the opinion expressed below. In such examination, we have assumed the
genuineness of all signatures, the authenticity of all documents submitted to us
as originals, the conformity to original documents of all documents submitted to
us as photostatic or certified copies and the authenticity of the originals of
such copies.

      Based upon such examination and review and upon representations made to us
by officers of the Company, we are of the opinion that upon issuance and
delivery of the Securities in accordance with the applicable terms and
conditions of the Plan and upon receipt by the Company of the full consideration
for the Securities as determined pursuant to the Plan, and assuming no change in
the applicable law or facts, the Securities will be validly issued, fully paid
and nonassessable.

      This opinion letter is limited to the matters stated herein, and no
opinion is implied or may be inferred beyond the matters expressly stated. We
hereby consent to the use of our opinion as herein set forth as an exhibit to
the Registration Statement. In giving this consent, we do not hereby admit that
we come within the category of persons whose consent is required under Section 7
of the Act or the rules and regulations of the Commission promulgated thereunder
or Item 509 of Regulation S-K.

                                          Very truly yours,

                                          /s/Baker & McKenzie