AST RESEARCH, INC., TECHNICAL BULLETIN #TB-0386 03-01-88 REACH MODEM/8 MHZ The AST Reach Modem does not operate reliably in systems operating at speeds in excess of 6 mHz. This includes the IBM AT Model 339 and all systems of similar or superior performance. The Reach Modem is a discontinued product and no fixes or modifications will be implemented.