OS/4 is a discontinued disc-resident operating system that UNIVAC introduced in 1972 for its 9400, 9480 and 9700 computer systems. It was an enhanced version of the earlier 9400 Disc Operating System rather than a design started from nothing. The system needed 64 KB of main memory, two disc drives, a punched-card reader and a printer, and its resident portion occupied roughly 24 KB of that memory. UNIVAC planned to replace OS/4 with a newer system called OS/7, but OS/7 development was stopped in 1975 when the 9700 was folded into the new UNIVAC Series 90 line as the 90/70, so OS/4 stands as the operating system of the 9400 family at its height.
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1. OS/4 (Wikipedia)
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OS/4 is a discontinued operating system, introduced in 1972, from UNIVAC for their 9400, 9480, and 9700 computer systems.
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