The AN/USQ-20, or CP-642[1][2][3] or Naval Tactical Data System (NTDS), was designed as a more reliable replacement for the Seymour Cray-designed AN/USQ-17 with the same 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 NASA was designated the UNIVAC 1206. Another version, designated the G-40, replaced the vacuum tube UNIVAC 1104 in the BOMARC Missile Program.
- ^ 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 (13 January 2015). "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.