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INES Mapper 107

INES Mapper 107 is assigned to the unlicensed game Magic Dragon released by Magicseries.

Banks

  • CPU $8000-$FFFF: 32 KB switchable PRG ROM bank
  • PPU $0000-$1FFF: 8 KB switchable CHR ROM bank

Registers

Bank select ($8000-$FFFF)

7  bit  0
---- ----
BBBB BBBb
|||| ||||
++++ ++++- Select 8 KB CHR ROM bank for PPU $0000-$1FFF
++++ +++-- Select 32 KB PRG ROM bank for CPU $8000-$FFFF

Unusually, bits 1-7 is used to switch both CHR and PRG banks simultaneously.

Notes

  • It’s currently unknown whether this mapper suffers from bus conflicts or not.
  • FCEUX implements only the bottom 3 bits of the unified register.

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