BSDI' s commercial version of {Berkeley Standard Distribution} {UniX}. BSD/OS is a POSIX-compatible, UniX-like system for the 80386, 486, and Pentium. It is based on the BSD software from UCB, a number of other sources, and components engineered by BSDI. The initial production release of BSD/OS shipped in March, 1993. (1996-01-13)