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Hello everyone, this is a very old topic, but maybe someone reads:
I´ve got a big problem here with a PSone SCPH102 Pal with PU 41 board. It seems no chip runs in that damn machine - I´ve tested them (GaryOPA 12F629 Hex und MM3 for 12F629 Hex) with another PS1 (PU22 board). I used the standard diagrams, 3 wire + link for the OPA, 7 wire for MM3 in the PU22, 6 wire in the PU41 - pin 4 left unused there. Has it to be put on ground here?
Thomething other is strange: the OPA chip is running fine in another PSone with PU41. What is the trick? Any guess? Thanks for any help!