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* '''Board: Prototype with Gate Array Simulator''' ([[CPC Prototypes|more picturspictures]])* The Gate Array Simulator board (mounted on top of the mainboard, and almost having the same size as the mainboard) contains four 8K EPROMs, and a Gate Array prototype made of several logic chips. In later versions these evolved into a single normal 28pin 32K ROM chip, and the usual custom 40pin Gate Array chip.