The Apollo Guidance Computer (AGC) is a digital computer produced for the Apollo program that was installed on board each Apollo command module (CM) and Apollo Lunar Module (LM). The AGC provided computation and electronic interfaces for guidance, navigation, and control of the spacecraft. The AGC was the first computer based on silicon integrated circuits (ICs). The computer's performance was comparable to the first generation of home computers from the 1970s, such as the Kenbak-1, Apple II, TRS-80, and Commodore PET. At around 1 cubic foot in size, the AGC held 4,100 IC packages.