INES Mapper 101
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This mapper is used for instance by Urusei Yatsura - Lum no Wedding Bell.
Supported in r3420 BizHawk, r2696 FCEUX (probably has been supported for eons), and reportedly MESS.
Registers: --------------------------- $6000-7FFF: [CCCC CCCC] C = Selects 8k CHR @ $0000
It's unknown how many bits C is but it probably isn't 8.