HELP need correct modchip installation diagram for scph-1000 motherboard version PU-7
i have recently received a psx scph-1000 with a very first model motherboard PU-7.
This is the very first playstation with S-video port.
I bought it with the purpose of modding it with a modchip 12c508 multimode modchip, i have some older ones laying around here as well.
But nowhere on the web i can find a installation diagram of a UP-7 motherboard, i cant find information about it, but i realy need it modded primary purpose is so it will be region free so i can play my games on it.
If someone can help me find the correct solder points that would be awesome, i modded alot of consoles before so it wont go to waste!