PU-7 PsNee modchip installation diagram

The PU-7 was the very first PlayStation 1 board that was released. It is found on all Japanese SCPH-1000’s, along with some SCPH-1001’s, SCPH-1002’s, SCPH-3000’s, and SCPH-3500’s.

This board is unique because it has the pins for S-Video video output along with the RCA video output ports. The S-Video port was only available on the Japanese SCPH-1000, but the pins are still on other systems with the PU-7 board.

For more information about PsNee chips click here, for more information about PS1 modchips click here.

PU-7 PsNee modchip installation diagram

PsNee ATtiny45 pinout

Arduino pinout:

  • Pin VCC – VCC
  • Pin GND – GND
  • Pin 3 – Debug TX
  • Pin 4 – BIOS A18
  • Pin 5 – BIOS D2
  • Pin 6 – SQCK
  • Pin 7 – SUBQ
  • Pin 8 – DATA
  • Pin 9 – GATE_WFCK

PU-8 PsNee installation diagram

Above is the diagram for the PU-7.

All of the points being soldered to are pretty straightforward pads. They are all located on the bottom side of the board. The PsNee is a great chip for the PU-7 because it supports anti-modchip games. The Mayumi V4 isn’t compatible with the PU-7 at all, and the MM3 doesn’t support stealth mode with the PU-7.

Installation tips

Here are some tips I have for you when you are soldering your chip into the PU-7.

  • You don’t need to connect pins one and two of the ATtiny45 chip. Just desolder the wire.
  • Use a multimeter to probe around for alternative VCC and GND points closer to where you position your chip for a cleaner installation.
  • Try to position your chip towards the middle of where all the wires need to go, to minimize wire length.

Diagram success rate

Here’s a list of people who have successfully modded their console with this diagram. Leave a comment and I’ll add you to the list.

  1. William Quade (me)

Example installations

This section has photos of some successful installations which you can use to get a better understanding of how everything is wired and positioned.

This is an installation I did on an SCPH-1000:

PU-7 PsNee installation

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