UNIVAC III
The UNIVAC III was delivered as a further development of the UNIVAC I and UNIVAC II in 1962; in contrast to its predecessors, it worked with transistors . Although the UNIVAC III was compatible with its predecessors, the layout of the instruction set and the machine word width were completely revised. This meant that existing programs had to be rewritten, which in turn prompted many customers to change their hardware.
Since the main memory caused the greatest costs at this time, the UNIVAC III was designed in such a way that it had to use as little main memory as possible.
Sperry Rand delivered 96 systems from 1962.
Processor layout
- Machine word (25 bit)
- Excess-3 (XS-3) coded with 4 bits / numbers, a maximum of 6 numbers numerically
- Alphanumeric with 6 bits / character, max. 4 characters Alphanumeric
| 25th | 24 | 23 | 22nd | 21st | 20th | 19th | 18th | 17th | 16 | 15th | 14th | 13 | 12 | 11 | 10 | 9 | 8th | 7th | 6th | 5 | 4th | 3 | 2 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| s | binary one's complement | |||||||||||||||||||||||
| s | numeric (XS-3) | numeric (XS-3) | numeric (XS-3) | numeric (XS-3) | numeric (XS-3) | numeric (XS-3) | ||||||||||||||||||
| s | alphanumeric | alphanumeric | alphanumeric | alphanumeric | ||||||||||||||||||||
- Instructions (25 bit)
| 25th | 24 | 23 | 22nd | 21st | 20th | 19th | 18th | 17th | 16 | 15th | 14th | 13 | 12 | 11 | 10 | 9 | 8th | 7th | 6th | 5 | 4th | 3 | 2 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| i / a | x | op (opcode) | ar / xo | m (address) | ||||||||||||||||||||
See also
Web links
- UNIVAC III Data Processing System A Third Survey of Domestic Electronic Digital Computing Systems Report No. 1115, March 1961 by Martin H. Weik, published by Ballistic Research Laboratories, Aberdeen Proving Ground, Maryland. (English)
- The UNIVAC III Computer (English)
- UNIVAC III photos