ASC-15

The ASC-15 (Advance System Controller Model 15) was a digital computer developed by International Business Machines (IBM) for use on the Titan II intercontinental ballistic missile (ICBM). It was subsequently modified and used on the Titan III and Saturn I Block II launch vehicles.

Its principal function on these rockets was to make navigation calculations using data from inertial sensor systems. It also performed readiness checks before launch. It was a digital serial processor using fixed-point data with 27-bit words. The storage was a drum memory. Electronic circuits were soldered encapsulated modules, consisting of discrete resistors, transistors, capacitors, and other components soldered together and encapsulated in a foam material. It was manufactured in the IBM plant at Owego, NY.