39-bit word length

Gemini Guidance Computer

Gemini Guidance Computer in National Air and Space Museum
Invented by	IBM Federal Systems Division
Manufacturer	IBM Federal Systems Division
Introduced	1965; 52 years ago (1965)
Discontinued	1966; 51 years ago (1966)
Type	Avionics Guidance Computer
Processor	Discrete IC RTL based
Frequency	7.143 kilohertz clock
Memory	39-bit words memory, each composed of three 13-bit syllables, 4096 words of memory, in a ferrite core array.
Ports	Modular Display Keyboard (MDK), Modular Display Readout (MDR), Attitude Control and Maneuver Electronics (ACME), Inertial Measurement Unit (IMU), Horizon Sensors, Time Reference System (TRS)
Power consumption	28V DC
Weight	58.98 pounds (26.75 kg)
Dimensions	18.9"(H)×14.5"(W)×12.75"(D)

The Gemini Guidance Computer (sometimes Gemini Spacecraft On-Board Computer (OBC)) was a digital, serial computer designed for Project Gemini, America's second manned space project. The computer, which facilitated the control of mission maneuvers, was designed by the IBM Federal Systems Division.

The Gemini Guidance Computer was responsible for the following functions:

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