INES Mapper 250
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INES Mapper 250 is a mapper by Nitra, used for pirate games such as Time Diver Avenger and the Queen Bee V.
FCEUX implements mapper 250 as an MMC3 variant where instead of using the LSB of the address to determine which register to write to, it instead uses the 0x400s bit. (i.e. the registers are at 0x8000,0x8400,0xA000,0xA400, &c and their mirrors)
