Sony PSIO Installation Manual page 9

Switch board, playstation mainboard
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The next two (2) pins to solder are pins 65 and 31 on the parallel port.
There are no trace cuts needed in this step.
Pin 65 goes to "PE" on the Switch Board.
Pin 31 goes to "PI" on the Switch Board.
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PSIOSB08052016-PU7

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