This is the Mayumi 4 installation I used with a PIC12C508A on an SCPH-7502 PlayStation with a PU-22 motherboard.

Mayumi 4 installation points

There are eight solder points in total.

PIC12C508A pinout

The mode sequence is:

Strongest Mode -> Old Modchip Mode -> Disable Mode

Hold reset for around two seconds to change modes.

Configuration recorded for this build:

WDT_OFF, ExtRC_OSC, MCLR_OFF

This installation is specific to the motherboard and PIC combination shown here.

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