Of course, it works without the ROM cart, it's not King of Fighters '95 and not Ultraman (only 2 titles used those, Kof 95 was in 2 regions, so 3 ROM carts in total, not counting AR and diagnostic ones)
Btw, it uses 1MB RAM cart, but unplayble glitchy on original hw with 4MB RAM cart, same for all SNK 1MB titles. Different mapping, iirc, don't remember clearly (also emulated in ssf).
KOF95 uses the same rom cart for both regions. It's dumped and released, so it's just a question of Mess having cart support. AR carts are also dumped, in fact there are something like 4 or 5 different dumps, some from the carts, some from the firmware updates released by Datel or whoever.
Most SNK games run fine with the 4mb ram cart, only a select few have bugs with them (mostly the Fatal Fury titles). It's only something around 5 games.
i always played this game on the SFF emulator.and i thought that the polygons looked so bad because of the emu itself.but no...they just look crap anyway
Game is a lot better on the Sega Saturn, being an updated version of the VF2 engine. That means that yes, the video emulation is quite choky there ...
Actually it looks like that on the real console as well. Megamix uses the Fighting Vipers engine, not VF2, which has significantly lower quality visuals than VF2. Only the backgrounds run in high-resolution for example, the characters themselves are low-res.
(Of course it's possible that Vipers uses an upgraded vf2 engine, but if it's upgraded, it's upgraded to handle the extra features of that game and not visually upgraded)
And the game doesn't do anything spectacular with the vdp1, no blending or background tricks and such, only the high resolution part is special. Even a basic vdp1 implementation can handle that fine. The game does have one peculiar problem though, that it shares with VF2. If you don't get the memory access timing right between the SH2 and the 68k, the game won't have sound.
Virtua Fighter 2, which Sega claims to be the most advanced and highest-performance use of the dual CPUs on the Saturn:
For a 1996 game, yeah. But iirc Dead or Alive and Quake both surpassed it (they use both SH2 *and* the scu dsp).