UniForum also saw Sun introduce a new 4.1 release of its SunOS Unix, source-code compatible with the new Unix System V.4, which means that existing Sun applications need only to be recompiled to run under the AT&T standard version. SunOS 4.1 is also compatible with the previous SunOS 4.0.3, and is out in April for Sun-3 and Sparc-based systems.
