Here is some Saturn and PSX info

[dlevere]

• Saturn Game Shark schematic (BSch CE3)
• Saturn Game Shark schematic (PNG)
• PSX Game Shark schematic (BSch CE3)
• PSX Game Shark schematic (PNG)
• PSX Gold Finger schematic (BSch CE3)
• PSX Gold Finger schematic (PNG)
• PSX Gold Finger PAL equations (PLD)
• PSX Gold Finger hardware notes
• PSX parallel port pin assignments (PNG)
• ROM replacement for PSX cheat device

[Helder]

I wish there was someone who could modify the Saturn gameshark rom to have some more code types, I have a chip programmer and have no problems soldering a new chip in the current rom's place.