R800 access speed of non-V9958 I/O ports is 10 cycles (@ 7.16 MHz) per operation. Much faster than Z80.
7 160 000 / 60 = 119333 cycles per frame
That makes it doable using ROM --> VRAM transfers, worst case 9216 bytes takes 92160 cycles, around 75% of a frame, per character.
>30 fps on the worst case (two huge sprites on screen). 920 kb of space on ROM, 1.8 Mb to store it on both directions. Almost half a MegaROM for just one character, the others are much smaller, and there is lots of optimizations available (parts of frames repeated), as pointed out before. Also, I'm converting a 128x144 directly, a grid of 8x9 sprites, some of them are entirely empty.
Of course would be a project for years, not months. And on end it would only run on a very specific and exotic configuration (Turbo R + V9990)
you can do a test from the same rom in the webMSX
it speeds up the z80 up to x6 (21.48Mhz), (alt+tab) although the r800 would be more of an x8 over the z80 at 3.58Mhz, the uploads are instantaneous.
ok, i'm watching a comparison video between the genesis and snes versions, and your version has bigger sprites than the genesis version, haven't you thought about using a little smaller sprite size? samurai shodown snes vs genesis
