Forum is back up, see post for details: http://bootleg.games/BGC_Forum/index.php?topic=3010.msg21813#msg21813
"Y2K05" I wonder if this means further VT03 and VT09 compatibility will be added to MAME as well.[/quote]I sure hope not, but I fear it's unavoidable.
davistech there are graphical glitches I think due to the scanline IRQ issues that NewRisingSun2 discovered[/quote]Try modifying the MMC3 scanline counter emulation to skip one scanline per frame, and then trigger the IRQ 32 PPU cycles/pixels later than when it would normally be triggered. That's what made it look clean in my emulation. I also return to normal IRQ behavior once the 4bpp mode is turned off, to make the original Mapper 4 games on that multicart look right, though I don't know whether that is what the actual hardware of that handheld does.