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Acorn 2MHz 6502A CPU (front)
Acorn 2MHz 6502A CPU (back)
This 6502A CPU comes from an Acorn System 5. The board appears to be a very early one with lots ofwire patches. The CPU (second IC from left) is a Synertek SY6502B which according an internet search is a 3MHz CPU. The first IC on left is a 6522A which handles the keyboard interface which is next to it. The ROM which has a white label which says "SYS 5F Iss 1.00" is an MBM2764 8K erable ROM. The IC to the right of the ROM is a HM6116P-3 2K Static RAM. The crystal at the bottom of the card is 24MHz.