Modchip wiring fixed

PSIO Switch Board Installation

The PSIO development cartridge, that I had preordered in June 2017, finally arrived this month. The whole package is very well made and looks almost like a genuine Sony PlayStation peripheral. The cartridge requires a modification before use, the PSIO switch board installation. The switch board detects the presence of the cartridge and switches the signals from the ODD to the parallel port.

PSIO package
PSIO package

PSIO package
PSIO package

The package contains the PSIO cartridge, a quick start guide, the switch board, some wire and a sticker.

PSIO package
PSIO package
PSIO package
PSIO package

I’m going to install the switch board into my SCPH-5552 PlayStation that I bought years ago with a custom blue case.

PlayStation SCPH-5552
PlayStation SCPH-5552

Installation instructions can be downloaded from the PSIO downloads page. There are instructions for 5 different mainboard revisions. The SCPH-5552 model has the PU-18 mainboard built-in, according to this list. Let’s open it up and check if this is true – you never know when dealing with a unit that has been put into a custom case.

Disassembly

Upper case removed
Upper case removed
ODD assembly removed
ODD assembly removed
Metal case removed
Metal case removed

Yes, it’s really a PU-18 mainboard:

PU-18 mainboard
PU-18 mainboard

On the bottom side of the PCB there is a weird old modchip installation.

PU-18 mainboard with modchip
PU-18 mainboard with modchip

Installation

I covered the modchip with some tape for now, as it worked flawlessly so far, and went right for the switch board installation.

PSIO switch board installation
PSIO switch board installation

The installation manual warns about running wires over the ground contacts (circled), well, the same goes for the Kapton tape.

PSIO switch board installation
PSIO switch board installation

Before reassembling the console I tested the installation with the PSIO cartridge plugged in. It worked on the first attempt.

Some final touches: freeing the ground contacts and tidying up the modchip wiring with the leftover wire.

Ground contacts freed
Ground contacts freed
Modchip wiring fixed
Modchip wiring fixed

Ready to play!

PSIO ready to play
PSIO ready to play

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