* Remove precalculation of sprite positions (didn't give a speedup and broke games that change the OAM address midframe)
* Ignore VRAM mode 0xC0 (bit6 is unused, they say)
* Add DMA open bus (SMAS SMB2 can finally be played without flooding the console and slowing down)
* Sprite overflow flag is actually implemented this time
* Better fix for SMW's sprites with Y=240