title: OS/4
text: # OS/4
  
  OS/4 is a discontinued operating system, introduced in 1972, from UNIVAC for their 9400, 9480, and 9700 computer systems. It is an enhanced version of UNIVAC's 9400 Disc Operating System. OS/4 is a disc-resident system requiring 64 KB of main memory, two disc drives, a punched-card reader and a printer. The resident memory footprint is approximately 24 KB.
  
  UNIVAC intended to replace OS/4 with a new system. OS/7, but OS/7 development was discontinued in 1975 when the 9700 was made part of the new UNIVAC Series 90 line as the 90/70.
  
  ## REferences
  
  * ↑ "UNIVAC 9700" (PDF). Bitsavers. Datapro. Retrieved April 7, 2023.
  * ↑ "UNIVAC 90/60,90/70, and 90/80" (PDF). Datapro. September 1976. Retrieved Aug 24, 2018.
  * ↑ "Univac 9000, Series 70 Sites Promised Help Moving to VS/9". Computerworld. November 26, 1975. Retrieved Aug 24, 2018.
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