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Integrated circuit 40 pin DIP 6808 microprocessor
If you are using this in pinball, a 6802 processor is a viable substitute.
6808 central processing unit (CPU) chip used on many early solid- state pinball games including Williams System 9 games.
Main processor with integrated RAM used on MPU boards, sound boards, etc.
Due to these chips being obsolete, they are very difficult to source. The current stock on hand is labeled as a Motorola MC6808, BUT are believed to be rebranded Hitachi HD6808 microprocessors.
Check this link HERE to learn how to get this microprocessor to function in a Williams System 9 or System 11 MPU or sound board.
Reference:
MC6808P
S6808P
6808P
HD6808
Williams 5A-9250
E-620-125 (location U3)
E-620-128 (location U3)