VS/9

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VS/9

Developer	Univac
OS family	TSOS
Working state	Discontinued
Source model	Unknown
Initial release	late 1960s
Platforms	UNIVAC Series 90 mainframe computers
Default user interface	Command-line interface
License	Proprietary

VS/9 is a computer operating system for the UNIVAC Series 90 mainframes (90/60, 90/70, and 90/80), used during the late 1960s through 1980s. The 90/60 and 90/70 were repackaged Univac 9700 computers. After the RCA acquisition by Sperry, it was determined that the RCA TSOS operating system was far more advanced than the Univac counterpart (named OS/7), so the company opted to merge the Univac hardware with the RCA software and introduced the 90/70. The 90/60 was introduced shortly thereafter as a slower, less expensive 90/70. It was not until the introduction of the 90/80 that VS/9 finally had a hardware platform optimized to take full advantage of its capability to allow both interactive and batch operations on the same computer.