Changing the built in game?

[chaoticjelly]

Does anyone know if its possible to change the game built into an SMS?

I read that the chip inside contains the game, and the mapper, into one, but wouldnt it be possible to create a circuit like a cartridge, where the mapper connects to where the old chip was, and the game is connected to the mapper?

You could put an SMS cart PCB inside, and wire it up, would that work???

[SaDistic]

No idea, I've got an opened sms lying around. I could check for the same chips if you want. Dont have any photos of the inside of the carts tho.

[chaoticjelly]

I think, It would be possible to replace the built in game, with a mask rom from a game cartridge, one that has all of the mapping stuff built into it (i.e. the cart contains no mappers) that would be interesting to try out sometime!