From Sega Retro
FixCheckSum is a simple program written by Esrael L. G. Neto to correct the checksum in Mega Drive ROMs. With few exceptions (such as Sonic & Knuckles), if the checksum is incorrect, the ROM will not be playable. The program also sets the ROM size to its correct value in the ROM header.
|Download ESE FixCheckSum
File: ESE FixCheckSum.zip (7 kB) (info)