PU-8 PsNee modchip installation diagram

This was one of the earlier PlayStation 1 board designs that included RCA composite video output ports on the back. Most SCPH-1001’s here in the United States had this board inside.

Additionally many Japanese systems had this board including many SCPH-3000, SCPH-3500, and SCPH-5000’s.

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

PU-8 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

PU-8 PsNee installation diagram

Above are two installation diagrams for two different versions of the PU-8. The easiest way to know which you have is to look at the size of the Mechacon controller chip (next to SUBQ and SCLK/SQCK). If it’s large, use the bottom diagram, if it’s small, use the top diagram.

Installation tips

Here are some tips I have for you when you are soldering your chip into the PU-8.

  • 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. Nobody yet.

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.

  • Nobody yet.

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