EXEC 8

from The Free On-line Dictionary of Computing (8 July 2008)

EXEC 8

   <operating system> {Unisys}'s {operating system} from about
   1980 to 2000, by which time it was a dying breed with Unisys
   moving to {Windows NT} and {Unix}.

   [Was 8 the successor to {EXEC 2}?]

   (2000-08-06)