INES Mapper 186
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iNES Mapper 186 is used for the Study Box (J) of rarely learning game.
Registry will respond to as follows.
$4200-$43FF: M186 (Read/Write) $4400-$4FFF: SWRAM (A/B) $6000-$7FFF: 8K PRG-RAM bank $8000-$BFFF: 16K switchable PRG-ROM bank $C000-$FFFF: 16K fixed PRG-ROM bank