NES 2.0 Mapper 538

NES 2.0 Mapper 538 denotes the 60-1064-16L PCB, used for a bootleg cartridge conversion named Super Soccer Champion of the Konami FDS game Exciting Soccer.

Banks

• CPU $6000-$7FFF: 8 KiB switchable PRG-ROM bank
• CPU $8000-$9FFF: 8 KiB switchable PRG-ROM bank
• CPU $A000-$BFFF: 8 KiB PRG ROM bank, fixed to bank #13
• CPU $C000-$DFFF: 8 KiB PRG ROM bank, fixed to bank #14
• CPU $E000-$FFFF: 8 KiB PRG ROM bank, fixed to bank #15
• PPU $0000-$1FFF: 8 KiB unbanked CHR-RAM

Mirroring is hard-wired to Vertical.

Registers

PRG-ROM Bank switch ($C000-$DFFF, write)

Mask: $E000

The low nibble sets the PRG-ROM banks both for the $6000-$7FFF and $8000-$9FFF CPU address ranges according to the following table:

Value written    0 1 2 3 4 5 6 7 8 9 A B C D E F
------------------------------------------------
$6000-$7FFF bank 1 1 3 3 5 5 7 7 9 9 B B D D F F
$8000-$9FFF bank 0 A 2 A 4 A 6 A 8 8 A A C C E E

Or as table-less C code:

bank6 = value |1;
bank8 = value &1 && ~value &8? 10: value &~1;

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.
• PCB image and description