Item 1.01 Entry Into a Material Definitive Agreement.

Effective April 27, 2009, RadiSys Corporation (the "Company") amended its Loan and Security Agreement with Silicon Valley Bank ("SVB") dated August 7, 2008 (as amended, the "Agreement"), by entering into the Fourth Amendment and Limited Waiver to Loan and Security Agreement dated April 27, 2009 (the "Fourth Amendment"). All capitalized terms used and not defined herein shall have the meanings assigned to them in the Agreement.

Pursuant to the Fourth Amendment, SVB agreed to waive a technical financing covenant default that existed as of March 31, 2009 and to amend the definition of "EBITDA" in the Agreement to exclude tax related charges due to the establishment of valuation allowances against the Company's U.S. net deferred tax asset for the fiscal quarter ending March 31, 2009. As of March 31, 2009, no amounts were outstanding under the Agreement.

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