Editing UNIVAC (section)

== Operating systems ==
The 1107 was the first 36-bit, [[word-oriented]] machine with an [[computer architecture|architecture]] close to that which came to be known as that of the "[[UNIVAC 1100/2200 series|1100 Series]]." It ran the [[UNIVAC EXEC I|EXEC I]] or [[UNIVAC EXEC II|EXEC II]] operating system, [[batch-oriented]] second-generation [[operating system]]s, typical of the early to mid-1960s. The 1108 ran EXEC II or [[EXEC 8]]. EXEC 8 allowed simultaneous handling of real-time applications, [[time-sharing]], and background batch work. [[Transaction Interface Package]] (TIP), a transaction-processing environment, allowed programs to be written in [[COBOL]] whereas similar programs on competing systems were written in assembly language. On later systems, EXEC 8 was renamed [[OS 1100]] and [[OS 2200]], with modern descendants maintaining backwards compatibility. Some more exotic operating systems ran on the 1108{{snd}}one of which was RTOS, a more bare-bones system designed to take better advantage of the hardware.

The affordable System 80 series of small mainframes ran the OS/3 operating system which originated on the Univac 90/30 (and later 90/25, and 90/40).

The [[UNIVAC Series 90]] first ran with Univac developed OS/9, which was later replaced by RCA's [[Virtual Memory Operating System]] (VMOS).  RCA originally called this operating system Time Sharing Operating System (TSOS), running on RCA's [[RCA Spectra 70|Spectra 70]] line of virtual memory systems and changed its name to VMOS before the Sperry acquisition of RCA CSD.  After VMOS was ported to the 90/60, Univac renamed it [[VS/9]].