EXHIBIT 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the Quarterly Report of RadiSys Corporation (the
"Company") on Form 10-Q for the fiscal quarter ended September 30, 2005 as filed
with the Securities and Exchange Commission on the date hereof (the "Report"),
I, Scott C. Grout, Chief Executive Officer of the Company, certify, pursuant to
18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that:

            (1) The Report fully complies with the requirements of section 13(a)
      or 15(d) of the Securities Exchange Act of 1934; and

            (2) The information contained in the Report fairly presents, in all
      material respects, the financial condition and results of operations of
      the Company.

November 7, 2005

                                       /s/ SCOTT C. GROUT
                                       -----------------------------------------
                                       Scott C. Grout
                                       Chief Executive Officer