PM-41 (2) PsNee modchip installation diagram

Towards the end of the SCPH-10x PSone production Sony revised the board slightly and released the PM-41 (2) board. This page covers the installation diagram for installing a PsNee chip into the PM-41 (2).

If your board has PM-41 printed on it then you should follow the PM-41 guide instead.

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

PM-41 (2) 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

PM-41 (2) PsNee installation diagram

Above is the installation diagram. 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.

If you have a PAL PSone system then you’ll need to use an Arduino board and connect A18 and D2. Otherwise just ignore A18 and D2.

Installation tips

Here are some tips I have for you when you are soldering your chip into the PM-41 (2).

  • 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.
  • If you are using an ATtinyX5, or have a SCPH-101, then ignore pins A18 and D2.
  • Use a multimeter to probe around for alternative VCC and GND points closer to where you position your chip for a cleaner installation.
  • There may also be easier to solder to points for SQCT and SUBQ.
  • Be super careful when soldering SQCT and SUBQ. It’s easy to bridge pins if you aren’t careful.
  • Be careful with the DATA connection, it’s easy to accidentally knock the capacitor off the board.

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.

Here are some sample installations I have done in SCPH-101’s:

  • Nobody yet.

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QuadjfetBehrouzMattPreto FonsecaWilliam Quade Recent comment authors
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I am no expert but was able to install properly on the first try! Having options for most of the connection points makes it much less intimidating, good luck to anyone else doing this mod


Hi. Do you have a diagram with photo for an installation with arduino? Thanks! I’m looking for this PM 41(2) NTSC model but I can’t find anyone…

Preto Fonseca
Preto Fonseca

Hey, today i manage to program and install a Psnee, and successfully install on a pm-41 (2). To program i used an Arduino Uno and a breadboard, and an Attiny85. Here’s a photo of it installed, it’s covered in eletrical tape because i wasn’t sure it was going to touch the metal shielding from de psone. PS: Quade, most of the tutorials i’ve seen on youtube and your guides here, don’t touch on the subject of “burning the fuses” on ArduinoIDE, using the “burn bootloader” option. Since im new to arduinos and programing chips, i was unaware this step… Read more »


Just installed my first mod chip thanks to this guide and your chip. Me and the roommate have already been exploiting it, and it works great!


hello i did uncomment both arduino board and region check and installed a pro mini too with all the wiring including pins 4 and 5 while it runs pal backups very good it cant run ntsc ones my console is ntsc


Reporting success with an ATtiny85 and a US NTSC PM-41 (2) mobo.
Worked first try. Nice diagram!