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.

  • You don’t need to connect pins one and two of the ATtiny45 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)

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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