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 FCEUX'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, the usual @ $6000-$7FFF, sometimes battery-backed?)
  • CHR-ROM (8x1KiB banks)
  • Mirroring (only written on General's Son?)
Registers
Address Purpose Size Target's address range
$C000 CHR bank(low) 1KiB $0000-$03FF
$C001 CHR bank(low) 1KiB $0400-$07FF
$C002 CHR bank(low) 1KiB $0800-$0BFF
$C003 CHR bank(low) 1KiB $0C00-$0FFF
$C004 CHR bank(hi) 1KiB $0000-$03FF
$C005 CHR bank(hi) 1KiB $0400-$07FF
$C006 CHR bank(hi) 1KiB $0800-$0BFF
$C007 CHR bank(hi) 1KiB $0C00-$0FFF
$C008 CHR bank(low) 1KiB $1000-$13FF
$C009 CHR bank(low) 1KiB $1400-$17FF
$C00A CHR bank(low) 1KiB $1800-$1BFF
$C00B CHR bank(low) 1KiB $1C00-$1FFF
$C00C CHR bank(hi) 1KiB $1000-$13FF
$C00D CHR bank(hi) 1KiB $1400-$17FF
$C00E CHR bank(hi) 1KiB $1800-$1BFF
$C00F CHR bank(hi) 1KiB $1C00-$1FFF
$C010 PRG bank 16KiB $8000-$BFFF
$C014 Mirroring d0, 1 for H