iNES Mapper 076 represents NAMCOT-3446, a board used only for the game Megami Tensei: Digital Devil Story.
It rewires the Namcot 108 mapper IC to be able to address 128 KiB of CHR, in exchange for coarser CHR banking.
The PCB also has a 7432 which allows the use of a 28-pin CHR-ROM.
Registers:
---------------------------
Mask: $E001
$8000: [.... .AAA]
A = Address for use with $8001
$8001: [..DD DDDD] Data port:
R:2 -> CHR reg 0 (2k @ $0000)
R:3 -> CHR reg 1 (2k @ $0800)
R:4 -> CHR reg 2 (2k @ $1000)
R:5 -> CHR reg 3 (2k @ $1800)
R:6 -> PRG reg 0 (8k @ $8000)
R:7 -> PRG reg 1 (8k @ $a000)
CHR Setup:
---------------------------
$0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00
+---------------+---------------+---------------+---------------+
| R:2 | R:3 | R:4 | R:5 |
+---------------+---------------+---------------+---------------+
PRG Setup:
---------------------------
$8000 $A000 $C000 $E000
+-------+-------+-------+-------+
| R:6 | R:7 | { -2} | { -1} |
+-------+-------+-------+-------+
Categories: In NesCartDB, INES Mappers, MMC3-like mappers