GBX Mapper List

maintained by taizou (web / email / twitter)

Last updated: 7th February 2022

Latest GBX spec

Mapper identifiers

Identifier Name
Nintendo
ROM ROM only
MBC1 Nintendo MBC1
MBC2 Nintendo MBC2
MBC3 Nintendo MBC3
MBC5 Nintendo MBC5
MBC6 Nintendo MBC6
MBC7 Nintendo MBC7 (Tilt sensor cart)
MB1M Nintendo MBC1 multicart
MMM1 Nintendo/Mani MMM01
CAMR Nintendo Game Boy Camera (Pocket Camera)
Licensed 3rd-party
HUC1 Hudson HuC1
HUC3 Hudson HuC3
TAM5 Bandai TAMA5
M161 Mani early multicart
Unlicensed
BBD BBD
HITK Hitek
SNTX Sintax
NTO1 NT older type 1
NTO2 NT older type 2
NTN NT newer
LICH Li Cheng
LBMC "Last Bible" multicart
LIBA Liebao Technology
PKJD Pokémon Jade/Diamond translations
WISD Wisdom Tree
SAM1 Sachen MMC1
SAM2 Sachen MMC2
ROCK Rocket Games/Datel
NGHK "New GB Color" HK0701/HK0819 PCB
GB81 Vast Fame secondary releases
Homebrew
TPP1 TPP1

Mapper-specific variables

Defined as 8 x 32-bit variables numbered 1-8 from the start of the mapper-specific variable block.

These may be subdivided further depending on need.

SAM2

Variable 1: First byte - Solder pad config

76543210
     |||
     ||+- Return open bus on 1 MiB outer banks
     |+-- Return open bus on 512 KiB outer banks
     +--- OPT1

GB81

Variable 1: First byte - PCB type