You can use CopyNES to rewrite this cart, if it's built in the Flash configuration. But you need to install one wire between the CopyNES board and the NES mainboard, this feature is on CopyNES but it hasn't been used before. It uses one of the otherwise-unused expansion pins of the cart. A rewritten cart will play on a normal NES also.
PRG-ROM sizes supported: 32kB, 64kB, 128kB, or 256kB
PRG-ROM page size: 2 modes (hard-wired). 16kB pages (with upper 16kB fixed), or 32kB pages.
CHR-RAM size: 8kB
Nametable mirroring: Standard 2-screen for H or V. Hard-wired.
PRG Memory type: 28 or 32-pin EPROM, or 32-pin FlashROM.
It will be available as a bare board, and built (fully or partially). Supply artwork and I can make some good-looking labeled carts too.
tepples: I could solder a switch on there, but it would just be hanging by 3 wires because I wouldn't know where to mount it exactly.
I didn't use any lockout defeats, since it would be experimental and for now I want something that's simple and just works. I'd use some kind of defeater if I could get new cart cases.
no carrier: That's odd. I've got the pic here also.
http://memblers.home.comcast.net/Pic204a.jpg