Xerox Corp yesterday announced the marriage of its Xerox Network Systems with the standard Unix networking facility to create Xerox TCP-XNS Gateway Service, offering mail, file transfer, printing and terminal emulation operations between XNS and environments using TCP/IP. A Xerox External Mail Gateway-X400 enables users on XNS networks to exchange electronic mail with public and private X400 systems. The company also announced an IGES 4.0 Graphics Conversion capability for new Xerox engineering graphics applications, enabling them to import and export graphics data from other programs. And the company has an 80386 co-processor for its 6085 Professional Computer System and enhanced local network capability for MS-DOS micros, so that users can switch almost instantly between MS-DOS and Xerox ViewPoint electronic desktop, and use a variety of methods to swap data between MS-DOS and ViewPoint applications. TCP-XNS Gateway Service is $6,000, X400 gateway $10,000, 80386 board $4,000 and Ethernet-to-XNS XNS PC Plus 2.0 $250; all third quarter.