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NES 2.0 Mapper 539

NES 2.0 Mapper 539 denotes a bootleg cartridge conversion of the original FDS version of Kid Icarus (パルテナの鏡).

Banks

CPU $6000-$7FFF: 8 KiB fixed PRG-ROM bank $D
CPU $8000-$9FFF: 8 KiB fixed PRG-ROM bank $C
CPU $A000-$BFFF: 8 KiB switchable PRG-ROM bank
CPU $C000-$DFFF: 8 KiB fixed PRG-ROM bank $E
CPU $E000-$FFFF: 8 KiB fixed PRG-ROM bank $F
PPU $0000-$1FFF: 8 KiB of unbanked CHR-RAM

Certain ranges in the CPU address space are overlaid with portions of 8 KiB of PRG-RAM as follows:

CPU $6000-$60FF
CPU $6200-$62FF
CPU $6400-$65FF
CPU $8200-$82FF
CPU $C000-$D1FF
CPU $DF00-$DFFF

Registers

PRG Bank Select ($A000, write)

Mask: unknown

D~7654 3210
  ---------
  .... BBBB
       ++++- Select 8 KiB PRG-ROM bank at CPU $A000-$BFFF

Nametable Mirroring Select ($FFFF, write)

Mask: unknown

D~7654 3210
  ---------
  .... M...
       +---- Select nametable mirroring type
              0: Vertical
              1: Horizontal

Notes

Save data is not retained.
The conversion retains all writes to the FDS sound channel registers. An emulator could provide the expansion sound channel even though the original cartridge did not.

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