AN / USQ-20
The AN / USQ-20 , or Naval Tactical Data System (NTDS), was a computer system. It replaced the AN / USQ-17 system with the same command set . The German Navy used the system for the first time on a destroyer as part of SATIR . The first 17 computers were shipped to the United States Navy in 1961 . A modified version of the AN / USQ-20 used by the American military and NASA was sold under the name UNIVAC 1206 . A variant of the AN / USQ-20 called G-40 was used for the Bomarc missile program.
The system was the size of an old refrigerator, about six feet high.
The instruction set was mapped using 30-bit words:
| Instruction word | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4th | 5 | 6th | 7th | 8th | 9 | 10 | 11 | 12 | 13 | 14th | 15th | 16 | .. | 30th |
| Function code | Jump condition |
Operand interpretation |
Address modification |
Base address | |||||||||||||
Numbers were mapped using 30-bit words . The memory was mapped with 32,768 words of core memory .
See also
Web links
- UNIVAC NTDs: UNIVAC 1206 AN / USQ-20 - on the Antique Computer website (Engl.)