Quote Originally Posted by SUPERABOBO View Post
Ah nice, Good to know.

Is it best pad out a rom to fill out the Eprom?

Looking at Panorama Cotton which is 2.5MB, should I pad it to 4MB to fill a 27C322, or does it not matter?
Short answer, no; only if you want to.
Long answer, : the Genesis, unlike the gameboy, does not read every byte to create a checksum of sorts. Granted you have all of the addressing pins on your Eprom connected to an output, those bytes will never be accessed, so the data is unimportant.