Does anybody know if there is a flash cartridge that will work in a GBC? Ive heard that the the Gameboys are backwards-compatable. Like... a GBA can use GBC carts... GBCs can us GB carts, etc.

What Im trying to do is put a bunch of GBC ROMs on a single cart. I already have the ROMs, so thats no problem. Ive been playing with them on my PC using an emulator.

At the tender age of 50 Im just now starting to play with this stuff. Any help would be greatly appreciated!

the only one I know is this

Insert the GBC game and turn on your Game Boy Color.
Press any direction on the pad while pressing B.
Depending on what directional pad you push, the screen is 1 of the 8 colors that you can play in.
Enjoy the game in a different color!

thats all I know

why not just get a nintendo ds and an edge card and put all your roms on a micro sd card and play hundreds of games ? just google edge for ds

Thats what Id like to do... but Im limited to the surplus equip on hand...