Prg and chr chips interchangable for nes and famicom?

This is an archive of a topic from NESdev BBS, taken in mid-October 2019 before a server upgrade.
View original topic

Prg and chr chips interchangable for nes and famicom?
by Mrkunio on 2018-04-03 (#216216)

I have an nes copy of faxanadu and a famicom copy of faxanadu. Can i swap the internal chips to make the famicom version english?

Are the mmc3a and b pcbs compatable for a swap? Anyone ever done this?

Both games are pretty cheap and common, just wanting to know if this can be done or not.

Thanks!

Re: Prg and chr chips interchangable for nes and famicom?
by lidnariq on 2018-04-03 (#216230)

I'm pretty certain that should work.

Re: Prg and chr chips interchangable for nes and famicom?
by rainwarrior on 2018-04-03 (#216232)

Faxanadu is CHR-RAM so you don't even need to swap the CHR part, only PRG.

You could use a regular EPROM though with a little bit of rewiring, instead of taking the mask ROM from another cartridge.

Re: Prg and chr chips interchangable for nes and famicom?
by Mrkunio on 2018-04-03 (#216248)

rainwarrior wrote:

Faxanadu is CHR-RAM so you don't even need to swap the CHR part, only PRG.

You could use a regular EPROM though with a little bit of rewiring, instead of taking the mask ROM from another cartridge.

Thanks! Im not setup with any eprom prog stuff yet so i was gonna give this method a shot! I can always swap it back when i get everything