what I meant was if its already being emulated so it wont require writting a whoel new emulator. Also the Genesis DID have the same exact Z80 co processor init whihc is what Neo Geo used to up the grfx. IF Genesis had used it for GFX instead of sound tehywould be IDENTICAL. Sega did manage to get a couple games to use it and they pushed the genesis well beyond what was intended, but sacrificed sounds effects and BG music in exchange.
The Genesis and Neo Geo had identical Sprite capabilities also only Neo Geo could display larger sprites due to usign a co processor.
The Neo Geos extra speed and suchs was also from the Z80 taking some of the load off. And it had more RAM.
Being they had such simialr hardware is sorta why the Genesis ports of SNk fighters were more accruate than SNES ports. which were impressive and colorfulfull but sluggish and choppy too.
All the would have to do for emulator is write the code upping the RAM allocations and getitng the right bios. not much to convert.