UNIVAC 490
The UNIVAC 490 was a 30-bit word core memory machine with 16K or 32K words; 4.8 microsecond cycle time made by Univac. The instruction word format: f - Function code designator (6 bits)j - Branch condition designator (3 bits)k - Operand-interpretation designator (3 bits)b - Operand address modification designator (3 bits)y - Operand designator (15 bits) Numbers were represented in one's complement. The machine provided the programmer with the following registerss: Seven B-registers (Address modifying index registers) 15 bits each One A-register or accumulator 30 bits One Q-register and auxiliary arithmetic register 30 bits Various customers used this machine type - principally airline reservations systems at Eastern Airlines (1963) and British European Airways (BEACON - 1964). The standard Operating System was REX (RealTime Exec), except at Eastern and B.E.A. where a custom operating system was developed for airline reservations (CONTORTS - CONTrol Of Real Time System). CONTORTS was the origin of Univac's subsequent RT operating systems for 494 (STARS) and later converted to the 1100 Series (RTOS).
External link UNIVAC 490 Real-Time System
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