NES 2.0 Mapper 290

NES 2.0 Mapper 290 is used for the Asder 20-in-1 multicart. Its UNIF board name is BMC-NTD-03.

Address latch

Mask: $8000

$8000: A~[1PPP PMCC Sp.. .CCC]
           ||| |||| ||    |||
           ||| ||++-------+++- Select 8 KiB CHR-ROM bank at PPU $0000-$1FFF
           ||| ||   |+-------- Select 16 KiB PRG-ROM bank at CPU $8000/$C000 if S=1
           ||| ||   +--------- Select PRG-ROM bank size, 0=32 KiB, 1=16 KiB
           ||| |+------------- Select nametable mirroring, 0=vertical, 1=horizontal 
           +++-+-------------- Select 32 KiB PRG-ROM bank at CPU $8000

Notes

The game Benico on that multicart has graphical glitches during attract mode on real hardware.

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