UNIVAC 490
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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 registers:
- 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 (http://ed-thelen.org/comp-hist/BRL61-u.html#UNIVAC-490)