UNIVAC 1100

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UNIVAC 1100, (UNIVersal Automatic Computer) a series of solid-state mainframe computer systems by Sperry UNIVAC (since 1986 Unisys), started with the UNIVAC 1107 in 1962, the multiprocessor capable UNIVAC 1108 introduced in 1964 using integrated circuits rather than thin film memory, the cheaper UNIVAC 1106 in 1969, the enhanced multiprocessing support UNIVAC 1110 in 1972, followed by the semiconductor memory series such as the 1100/10 in 1975 and the 1100/80 in 1979.

=Architecture= The UNIVAC 1100 series was a 36-bit machine using ones' complement integer arithmetic as well as single (1:8:27) and double precision (1:11:60) floating point arithmetic. 128 registers include 15 index registers (X1 ... X15), 16 accumulators (A0 ... A15), and 15 special function user registers (R1 .. R15), the last four index registers (X12 ... X15) and the first four accumulators (A0 ... A3) overlap. All instructions were one 36-bit word long. Early machines had core memory and plated wire memory, until that was replaced with semiconductor memory in 1975. =Photos= The CHAOS Team circa 1972 with UNIVAC 1108 Computer in Cinnaminson, NJ From left, Fred Swartz (rear), Vic Berman (front), Bill Toikka, Ira Ruben (seated), Joe Winograd

=Chess Programs=
 * Black Knight
 * Blitz
 * CHAOS
 * Coko
 * Dark Horse
 * MSU CP
 * Orwell

=See also=
 * UNIVAC 418
 * UNIVAC 494

=Manuals=
 * SPERRY UNIVAC Series 1100 Sales Information Manual (pdf hosted by bitsavers.org)
 * UNIVAC 1108-II The Big System With the Big Reputation, 1965 (pdf hosted by The Computer History Museum)

=External Links=
 * UNIVAC 1100/2200 series from Wikipedia
 * UNIVAC 1100/60 from Wikipedia
 * UNIVAC Memories by John Walker
 * UNIVAC 1100 Series Instruction Set

=References=

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