MottZilla wrote:
I believe the MMC5 pinout shows an address line to PRG for a ROM as big as 1 Megabyte. I'm not sure if the ROM socket on any PCB has it connected though. Why do you need 1 Megabyte of PRG? You can accomplish this with MMC1 being wired similar to SXROM/SUROM. Or by wiring up a UxROM type board to have more PRG register bits.
And you can get more then 1MB is you then use the CHR-ROM lines to switch the 512K banks, and then just use CHR-RAM.