PU-20 PsNee modchip installation diagram

This board was used exclusively with the SCPH-7000 series of consoles.

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

PU-20 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-20 PsNee installation diagram

Above is the installation diagram for the PU-20. Just match each colored pin label in the diagram with any matching colored point on the board. There is a second image of the chip in the diagram showing a good place to position the chip.

Installation tips

Here are some tips I have for you when you are soldering your chip into the PU-20.

  • Cut your wires to be as short and direct as possible.
  • You don’t need to connect pins one and two of the ATtinyX5 chip. Just desolder the wire.
  • The DATA pin can be trickier to solder, make sure you don’t use too much solder or you risk bridging pins on the chip.

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)
  2. Retro Gaming Denmark

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.

  • William Quade (me)

PU-20 PsNee example installation

This is an example of an installation I did in a PU-20 using a socket. Using the socket allows me to test chips, and test new PsNee code. Note that the chip is a little too tall and prevents the top metal shield from going on all the way.

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