NES 2.0 Mapper 399

BATMAP-000

Company
Complexity	ASIC
Boards	BATMAP-000
PRG ROM capacity	1024K
PRG ROM window	8K + 8K + 16K fixed
PRG RAM capacity
CHR capacity	32K
CHR window	4Kx2
Nametable arrangement	H or V, switchable
Bus conflicts	No
IRQ	Yes
Audio	No
iNES mappers	~~399~~

NES 2.0 Mapper 399 is used for BATMAP-000.

Banks

CPU $8000-$9FFF: fixed to first (#0) 8 KiB of PRG ROM
CPU $A000-$BFFF: 8 KiB switchable PRG ROM
CPU $C000-$DFFF: 8 KiB switchable PRG ROM
CPU $8000-$9FFF: fixed to last (#127) 8 KiB of PRG ROM
PPU $0000-$0FFF: 4 KiB switchable CHR memory
PPU $1000-$1FFF: 4 KiB switchable CHR memory

Registers

CHR bank select ($8000, write)

Mask: probably $E001

7654 3210
---------
B... .CCC
|     +++- 4 KiB CHR bank number
+--------- 0: Set 4 KiB CHR bank at PPU $0000-$0FFF
           1: Set 4 KiB CHR bank at PPU $1000-$1FFF

PRG bank select ($8001, write)

Mask: probably $E001

7654 3210
---------
BPPP PPPP
|+++ ++++- 8 KiB PRG-ROM bank number
+--------- 0: Set 8 KiB PRG bank at CPU $A000-$BFFF
           1: Set 8 KiB PRG bank at CPU $C000-$DFFF

Other registers ($A000-$FFFF)

Mirroring ($A000-$BFFE even) and IRQ ($C000-FFFF) are believed to be the same as MMC3. WRAM functionality is unknown.

Hardware

The attested game, Star Versus by Dustmop, uses 32 KiB of CHR RAM.

References

Description by NewRisingSun

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