The 6502A Microcomputer


Note: that there is a mistake on the schematic, pin 19 of IC9 & 10 it shown tied to 0V but should be linked to the enable signal on pin 1.  This mistake appears to have made its way on to the PCB's as well.  It is unlikely to cause a problem unless the bus request feature is used (B25).



200.005 Issue C [3 System 5]

Acorn System 6502A Microcomputer PCB Issue CAcorn System 6502A Microcomputer PCB Issue C

Data Sheets:

Replica Board:

I have made a replica of this board details of which can be found here:


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