PU-8 MM3 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 MM3 chips click here, for more information about PS1 modchips click here.

PU-8 MM3 modchip installation diagram

MM3 chip pinout

PU-8 MM3 modchip installation diagram

Above is the diagram for the PU-8.

All of the points being soldered to are pretty straightforward pads. They are all located on the bottom side of the board. You can ignore the other chip on the board. Some early PS1’s had a chip soldered like that onto the board from the factory.

There are multiple versions of the PU-8 board, below is another diagram that may work if the other one doesn’t match your system:

MM3 PU-8 alternate 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 four and two.
  • Placing the chip towards the middle of all of the pads you need to solder to is ideal. If you flatten the legs on the chip it will fit underneath the board without any modifications.

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) (I’ve used this diagram to mod one SCPH-1001 and didn’t have any problems with it)

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-1001’s:

This image shows a cleaner way to install the chip with six wires. I probed the board with a multimeter to find alternate points to solder the wires to that are much closer together. The only real tricky point is soldering pin six to the leg of the surface mount chip.



PU-8 MM3 install

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