Advanced Technology Airborne Computer
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The Advanced Technology Airborne Computer (ATAC) was a product of Itek (a division of Litton Industries), used on US naval aircraft, and the NASA Galileo (spacecraft).[1]: 198–201
The ATAC was built using AMD 2901 4-bit processors and had a basic cycle time of 250 ns.[1]: 198 It could be programmed in HAL/S, and could be microprogrammed to add new instructions. The Galileo project added four instructions.