SEGA Master System EPROM Cart Mods

Channel: TheSegaGuru


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How to program Master System ROMs onto a modified cartridge PCB using EPROMs for play on actual system.

to check out games that have been converted from Game Gear.

For any hacked game, the checksum must be fixed prior to programming onto an EPROM in order to run on an actual system. Check out my vid on fixing Master System ROM checksums.

for info on mappers used and which games they are likely to be in.

No mapper needed for 32KB ROMs.

PCB 171-5519 / equivalent needed with 28 pin mask ROM.
EPROM 27C256 compatible.

After Burner is a perfect candidate for 128KB-512KB ROMs
as it has a 32 pin mask ROM and seems to always have the
315-5235 mapper. More info on mappers / where to find them
can be founs on (See link above).

EPROMs compatible:
27C256 32KB
27C010 1Mbit / 128KB
27C020 2Mbit / 256KB
27C040 4Mbit / 512KB

I figured this out because i HAD to have Alex Kidd BMX Trial
running on my western Master System.
You are welcome to ask questions if you need help :)