PSOne MM3 mod chip install. There are many others like it, but this one is mine. : r/psx
Burning Your Own PS1 Modchip Is Easy | Hackaday
iFixRetro on Twitter: "Modbo 5.0 chip installed on a Sony PS2 Slim 90001! Play all the imported games now that your system is region free! https://t.co/rAb9vNpt5L" / Twitter