Press Release

RadiSys to Present at the Thomeas Weisel Partners Technology and Telecom Conference on Feburary 9, 2010

HILLSBORO, Ore. — January 29, 2010 — RadiSys® Corporation (NASDAQ: RSYS), a leading global provider of application-ready software and hardware platforms for use in the communications, multi-media, defense and medical markets, announced that it will participate in the Thomas Weisel Partners Technology and Telecom Conference to be held February 8-10 in San Francisco, CA. Brian Bronson, RadiSys Chief Financial Officer, will present an overview of the Company’s business and strategy on Tuesday, February 9, 2010 at 4:25 p.m. PT. A live audio webcast and a replay of the event will be available on the Company’s 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