INES Mapper 156

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As of 04-sep-2012, fceux supports this mapper correctly (r2648). The code was taken from fceu-mm which had some bugs related to missing reset logic. It is additionally supported by the Nestopia 1.40u4 hack. Mednafen also supports this mapper.

It is described as "DIS23C01 DAOU ROM CONTROLLER, Korea" and is used by the following games:

  • Metal Force (K)
  • Buzz and Waldog (K)
  • General's Son (K)

The following description of it is based on Mednafen's implementation. It appears to fully-decode them, but that's probably inaccurate.

  • PRG-ROM (16KiB switchable + 16KiB fixed-to-last banks)
  • PRG-RAM (8KiB, he usual @ $6000-$7FFF, sometimes battery-backed?)
  • CHR-ROM (8x1KiB banks)
Registers
Address Purpose Size Target's address range
$C000 CHR bank 1KiB $0000-$03FF
$C001 CHR bank 1KiB $0400-$07FF
$C002 CHR bank 1KiB $0800-$0BFF
$C003 CHR bank 1KiB $0C00-$0FFF
$C008 CHR bank 1KiB $1000-$13FF
$C009 CHR bank 1KiB $1400-$17FF
$C00A CHR bank 1KiB $1800-$1BFF
$C00B CHR bank 1KiB $1C00-$1FFF
$C010 PRG bank 16KiB $8000-$BFFF