If I wanna make a NES repro cart, how do I figure out...

[REPO Man]

Again, I would like to suggest using the new NES PCBs from retrousb.com over using donor carts for a few reasons. For starters, you don't have to destroy a NES game to make a repro. Also, your cart will be brand new (new pins). Probably the best thing is that the pinout will match an EPROM so you it's a direct drop in. You don't have to mess around with rewiring pins.

Again, limited mapper support. And two of the games I wanna repro use none of the mappers they support.

[jeffro11]

Exactly my thoughts too.

[Ziggy]

I mean whenever possible, I realize the two PCBs do not support all mappers.