UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                     FORM 15

CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(G) OF
THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER
SECTIONS 13 AND 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934.

                        Commission File Number 333-49092

                               RadiSys Corporation
                               -------------------
             (Exact name of registrant as specified in its charter)

               5445 NE Dawson Creek Drive, Hillsboro, Oregon 97124
               ---------------------------------------------------
                                 (503) 615-1100
                                 --------------
          (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)

                 5 1/2% Convertible Subordinated Notes due 2007
                 ----------------------------------------------
            (Title of each class of securities covered by this Form)

                                  Common Stock
                                  ------------
           (Titles of all other classes of securities for which a duty
             to file reports under section 13(a) or 15(d) remains)

         Please place an X in the box(es) to designate the appropriate rule
provision(s) relied upon to terminate or suspend the duty to file reports:

         Rule 12g - 4(a)(1)(i)    [  ]        Rule 12h - 3(b)(1)(i)    [ X]
         Rule 12g - 4(a)(1)(ii)   [  ]        Rule 12h - 3(b)(1)(ii)   [  ]
         Rule 12g - 4(a)(2)(i)    [  ]        Rule 12h - 3(b)(2)(i)    [  ]
         Rule 12g - 4(a)(2)(ii)   [  ]        Rule 12h - 3(b)(2)(ii)   [  ]
                                              Rule 15d - 6             [  ]

         Approximate number of holders of record of 5 1/2% Convertible
Subordinated Notes as of December 31, 2002: 30.

         Pursuant to the requirements of the Securities Exchange Act of 1934,
RadiSys Corporation has caused this certification/notice to be signed on its
behalf by the undersigned duly authorized person.

Date:    January 10, 2003                   By:    /s/ JULIA A. HARPER
                                                   ---------------------
                                                   Julia A. Harper
                                                   Chief Financial Officer

Instruction: This form is required by Rules 12g-4, 12h-3 and 15d-6 of the
General Rules and Regulations under the Securities Exchange Act of 1934. The
registrant shall file with the Commission three copies of Form 15, one of which
shall be manually signed. It may be signed by an officer of the registrant, by
counsel or by any other duly authorized person. The name and title of the person
signing the form shall be typed or printed under the signature.