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The TOPS-10 System ( Timesharing / Total OPerating System ) was a computer operating system from Digital Equipment Corporation ( DEC ) for the PDP-10 ( or DECsystem-10 ) mainframe computer launched in 1967.

TOPS-10 evolved from the earlier " Monitor " software for the PDP-6 and-10 computers ; this was renamed TOPS-10 in 1970.