Switch Board; Information; Installation - Sony PSIO Installation Manual

1-0: Switch Board:

[1-1: Information]

The Switch Board is required in order for PSIO to work correctly. The reason behind it is that Sony
never provided direct access to the CD-ROM CPU on the Parallel I/O bus. In our case, access to the
CDDA and XA interrupt lines. What the Switch Board does is it actually switches the required data
lines and forwards them through to the PSIO cartridge. The Switch Board also allows PSIO to drive
the CD-ROM directly and give us complete control over it.
Keep in mind that the Switch Board is completely invisible to the PlayStation.
That means, when your PSIO cartridge is unplugged and not in use, your PlayStation returns back to
normal operation. The CD-ROM drive will work as it normally would, and you will also be able to
use Game Shark/Action Replay cartridges like normal.
If you have a Modchip installed in your PlayStation, the Switch Board and Modchip will work fine
side by side with each other. Remember, the Switch Board is invisible to the PlayStation.

[1-2: Installation]

First off, you will require some tools:
- Switch Board (included with your PSIO cartridge purchase),
- Kynar Wire (included with your PSIO cartridge purchase),
- Soldering Iron (use a good tip!),
- Solder (preferably flux cored 60/40),
- Flux (optional),
- 10x Magnification Jewellers Microscope/Loop (optional),
- Phillips Screwdriver,
- A Multimeter (for Continuity Testing),
- A sharp 'hobby' knife (EG: X-Acto), and
- Scissors.
Let's begin.
First off, you will need to disassemble your PlayStation 1. However, before you start to disassemble
your console, you must ensure that your PlayStation 1 is completely isolated and unplugged from
all connections, including most importantly, the main power cable (AC).
Ensure that you have taken out any CD-ROM's in the drive and have put them away safely.
Once you have ensured your console is isolated and unplugged, turn it over, and unscrew all of the
screws on the back. Then, whilst holding the sides with two hands, flip the console over. You can
then lift off the top shell to expose the internal components.
The next step is to remove the CD-ROM assembly system. There are two cables that connect the
drive to the mainboard. One is a delicate ribbon cable, and the other is a pair of twisted core wire.
Both cables simply unplug by pulling on them, but be careful not to tear the ribbon cable.
Depending on your PlayStation model, each system disassembles differently from here on in, but
the next step is essentially removing the metal chassis.
Once you have removed all the screws from the steel chassis, it should now lift of freely, exposing
the bare mainboard.
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