You can use it to repair broken slot Famicom or use it to make Catridge Reader.

You can use it to repair broken slot Japan Mark III or use it to make Catridge Reader. Mark III converter for MD use it to make.

It is not replacement parts for NES. So, you can not use it to replace damaged NES Slot. You only can use it to make something like Cart Reader.

Power Supply 9V DC (Plug - inside is negative). It can use for all classic console. (PC Engine, Genesis, MegaDrive, SEGACD, Master System, Famicom,...