This listing for an MM3 (Multi Mode 3) Modchip for the Playstation 1 (Psone, PS1, PSX)
When installed properly, These chips will allow for Region Free Disc playback as well as Backup support.
This modchip is a 7 wire install and will work on any Ps1 revision.
I recommend only using these chips on the Early model Ps1s with the AV ports in the back (Pu-7 / Pu-8)
For all other consoles, I'd recommend using a Mayumi v4 Modchip which I also sell.
The Mayumi requires 1 more wire but in my experience it functions much better than MM3 on all models that support it which is every console except the very early revisions.
Keep in mind that Pal games will likely have display issues to the 50htz to 60htz differences.
These chips are programmed to work on North American consoles (NTSC-U) if you have a Pal or NTSC-J console, this will not work for you.
Chip comes with some 30 AWG hookup wire as well as a ModzvilleUSA approved vinyl sticker
For Install Diagrams I'd recommend checking out Quade's Page Here