Quote Originally Posted by FuzzX View Post
Thank you for you fast response! I don't know right now of any ROM that needs SRAM save and ROM size is 4 MB's*. My intention was to make a cart with swappable eproms, that supports the ones with save.

So, if I want to use a donor cartridge with 2 MB's with save, and put a ROM with 4 MB's that doesn't needs save, I should short in some way the SRAM's pins to avoid any problem?




Woah, those pcb's seem very cool, I wish I knew enough electronics to make one with save.



*I just remembered when writting this post, that Sonic & Knuckles + Sonic the Hedgehog 3 is 4 MB's and uses save, but I don't know how it works, since is actually, two games together, I guess it uses battey backed SRAM in one of the two cartridges. So maybe is not possible to save with that kind of ROM.

Thank you so much again for your clarifications!
Sonic 3 uses FRAM for saving, but that should be mapped to the same location as an SRAM. These two games cannot be put onto one cart alone, so this does not count. It is hacked for use in emulators.