The PU-7 was the very first PlayStation 1 board that was released. It is found on all Japanese SCPH-1000's, along with some SCPH-1001's, SCPH-1002's, SCPH-3000's, and SCPH-3500's.
I sell PsNee modchips in my store.
This board is unique because it has the pins for S-Video video output along with the RCA video output ports. The S-Video port was only available on the Japanese SCPH-1000, but the pins are still on other systems with the PU-7 board.
PU-7 PsNee modchip installation diagram
- 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
Above is the diagram for the PU-7.
All of the points being soldered to are pretty straightforward pads. They are all located on the bottom side of the board. The PsNee is a great chip for the PU-7 because it supports anti-modchip games. The Mayumi V4 isn't compatible with the PU-7 at all, and the MM3 doesn't support stealth mode with the PU-7.
Here are some tips I have for you when you are soldering your chip into the PU-7.
- 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.
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.
- William Quade (me)
This section has photos of some successful installations which you can use to get a better understanding of how everything is wired and positioned.
This is an installation I did on an SCPH-1000: