AN/USQ-20
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The instruction set. The first batch of 17 computers were delivered to the Navy starting in early 1961.[4]
A version of the AN/USQ-20 for use by the other military services and
BOMARC Missile Program
.
Technical
The machine was the size and shape of an old-fashioned double-door refrigerator, about six feet tall (roughly 1.80 meters).
words
in the following format:
f 6 bits function code j 3 bits jump condition designator k 3 bits partial word designator b 3 bits which index register to use y 15 bits operand address in memory
Numbers were represented as 30-bit words. This allowed for five 6-bit
alphanumeric
characters per word.
The main memory was 32,768 words of
core memory
.
The available processor registers were:
- One 30-bit arithmetic (A) register.
- A contiguous 30-bit Q register (total of 60 bits for the result of multiplication or the dividend in division).
- Seven 15-bit index (B) registers (note: register B0 is always zero).
See also
References
- ^ David L. Boslaugh. "IEEE Global History Network - First-Hand:Testing the Naval Tactical Data System - Chapter 5 of the Story of the Naval Tactical Data System". Retrieved March 11, 2021.
- ^ "Computer History Museum:Managing the Threat". Retrieved March 11, 2021.
- ^ "UNIVAC-NTDS historical notes". Retrieved March 11, 2021.
- ^ David L. Boslaugh. "IEEE Global History Network - First-Hand:Moving the Firing Key to NTDS - Chapter 6 of the Story of the Naval Tactical Data System". Retrieved March 11, 2021.
External links
- UNIVAC-NTDS: UNIVAC 1206, AN/USQ-20 – From the Antique Computer website