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