Play 8-bit Sega Master System games on a standalone 16-bit Genesis cartridge
Designed by t1lt in United States of America
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What is it? One of the little-known features of the Sega Genesis/Mega Drive is its ability to play original Sega Master System 8-bit cartridges using a special adapter. This cartridge combines the S…
Read More…One of the little-known features of the Sega Genesis/Mega Drive is its ability to play original Sega Master System 8-bit cartridges using a special adapter. This cartridge combines the SMS to Genesis adapter circuitry with some classic Master System hardware to make an 8-bit-only flashable Genesis cart!
On the Master System side, the cartridge emulates the function of the original 315-5235 Sega Paging Chip using a novel design with 10 discrete logic ICs, paired with a battery backed SRAM for game save.
Use this cartridge to out try out one of your original Master System games like Phantasy Star as a Genesis cartridge, or if you are a SMS developer, this could be a new 512KB platform to release your 8-bit games on.
It started as a personal project to see if I could get Phantasy Star to run on a newly acquired Genesis, but as a homebrew developer of NES games ( see my itch site here ), I realized there wasn't anything like it out there for SMS homebrew developers looking for a way to release their games for the Genesis as well. Feel free to reach out if you are looking for a custom version of this cartridge for a different paging chip, no battery save, different hardware configuration, etc.
As far as I know this is the first 8-bit Genesis cartridge, and the first successful replacement of the proprietary Sega 315-5235 chip with off-the-shelf parts.
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