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.