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.
EARLY
LATE
Above are two installation diagrams for two different versions of the PU-8. The easiest way to determine which one you have is to compare the serial number on your motherboard with the table below.
| PU-8 motherboard revision number |
|---|
| EARLY |
| 1-658-467-11 |
| 1-658-467-12 |
| 1-658-467-13 |
| LATE |
| 1-658-467-21 |
| 1-658-467-22 |
| 1-658-467-23 |
| 1-658-467-41 |
| 1-658-467-42 |
About the points
For models SCPH-xxx1, SCPH-xxx2, all the points are on the back, and you can ignore the RESET. On the other hand, the model and SCPH_xxx0, you will have to use the RESET point, and the BIOS points.
Installation tips
Here are some tips I have for you when you are soldering your chip into the PU-8.
- 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.
- 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.