Press Release

RadiSys To Report Fourth Quarter 2009 Earnings And Host Conference Call On February 2, 2010

HILLSBORO, OR — Jan 15, 2010 — RadiSys® Corporation (NASDAQ:RSYS), a leading global provider of advanced embedded solutions, will announce results for the fourth quarter of 2009 at 4:05 p.m. ET on Tuesday, February 2, 2010. Following the release, Scott Grout, Chief Executive Officer and Brian Bronson, Chief Financial Officer, will host a conference call at 5:00 p.m. ET to discuss the Company's results, along with business highlights and the outlook.

To participate in the live conference call, dial (888) 333-0027 in the U.S. and Canada or (706) 634-4990 for all other countries and reference conference ID# 50769533. The live conference call will also be available via webcast on the RadiSys investor relations website at http://investor.radisys.com/.

A replay of the conference call will be available two hours after the call is complete until 11:59 p.m. ET on Tuesday, February 16, 2010. To access the replay, dial (800) 642-1687 in the U.S. and Canada or (706) 645-9291 for all other countries with conference ID# 50769533. A replay of the webcast will be available for an extended period of time on the RadiSys investor relations website at http://investor.radisys.com/.

For more information, contact:

• Brian Bronson
• Chief Financial Officer
• 1–503–615–1281
• brian.bronson@radisys.com

• Holly Stephens
• Finance and Investor Relations Manager
• 1–503–615–1321
• holly.stephens@radisys.com