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The ATAC was built using [[AM2901|AMD 2901]] 4-bit processors and had a basic cycle time of 250 ns.<ref name=Tomayko-1988/>{{rp|198}} It could be programmed in [[HAL/S]], and could be [[microprogramming|microprogrammed]] to add new instructions. The [[Galileo project]] added four instructions.
== Use by
The Galileo Attitude and Articulation Control System (AACSE) was controlled by two Itek Advanced Technology Airborne Computers (ATAC), built using radiation-hardened
The [[Galileo project]] had radiation-hardened 2901 processors made (by Sandia National Lab) for the spacecraft.<ref name=Tomayko-1988/>{{rp|202}}
== References ==
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