Sybase Inc, Emeryville, California yesterday launched three products for turning IBM MVS mainframes into network servers. Sybase Open Server for CICS provides access to all MVS data, applications and services; Open Gateway for DB2 offers the capabilities of Open Server for CICS plus an SQL-based gateway for turnkey access to DB2; and Net-Gateway is a network gateway that controls and monitors the communication between client computers and the IBM host. Open Server for CICS and Open Gateway for DB2 are Systems Application Architecture-compliant and support CPI-C, APPC and LU 6.2 protocols; the former is $75,000 to $155,000, the latter $100,000 to $210,000 from next quarter; Net-Gateway, $1,260 to $64,800.