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Game Boy Color Bootstrap ROM

From The Cutting Room Floor
(Redirected from GBC BIOS)
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Title Screen

Game Boy Color Bootstrap ROM

Developer: Nintendo
Publisher: Nintendo
Released in JP: October 21, 1998
Released in US: November 18, 1998
Released in EU: November 23, 1998
Released in AU: February 3, 1999

GraphicsIcon.png This game has unused graphics.

NotesIcon.png This game has a notes page

Hmmm...
To do:
Stuff from the source code in the 2020-07-25 Nintendo leak.

The Game Boy Color (abbreviated GBC or CGB) is often considered to be the successor to the original Game Boy, although it's technically more of an upgraded model - even being counted as such by Nintendo. The GBC uses the same Z80-based 8-bit CPU as the original Game Boy, but with a higher clock speed, expanded RAM, and most obviously, Color.

The Game Boy's early competitors, the Game Gear and Lynx, did offer color, but didn't have the Game Boy's huge battery life and library. This new Game Boy later pushed competitors Bandai and SNK to make "Color" upgrades of the WonderSwan and Neo Geo Pocket, respectively.

The Game Boy Color Bootstrap ROM (often mistakenly called a BIOS although it is not a system for handling basic in- or output) is executed when the GBC is turned on. Just like the Game Boy bootstrap ROM, it checks the inserted game cartridge for integrity by calculating the complement checksum, locking out cartridges that may be corrupted or which don't have the copyrighted Nintendo logo within.

Unused Palette Configurations

(See the Notes page for the used palette configurations.)

The ROM assigns color palettes to certain monochrome Game Boy games by computing a hash for every Nintendo Licensee game and checking it against an internal database of hashes. However, a big chunk of color tables actually went unused: only 94 hashes are on record, which only use 45 different palette configurations out of 174 possible configurations - of which 146 are unique! Minus the six unique colors the GBC lets the user select manually (from 12 total) and the 45 associated with games, this makes for a whopping 95 palette configurations that were never used!

To access the unused palettes using an emulator that allows the bootstrap ROM to load, use GameShark code 01??08D0, where "??" is the ID of the desired entry. The selected palette will load regardless of whether any buttons have been pressed.

There are a total of 123 palette configurations in here, 15 of which are duplicates of assigned palette configurations (games with hardcoded default palettes on Game Boy Color) and 13 of which are duplicates within this table. These duplicates are marked with their respective original entry in small script.

Table Entry Palettes Color 0x00 Color 0x01 Color 0x02 Color 0x03
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(0x00/0x0C)

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(0x00/0x12)

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(0x00/0x10)

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(0x00/0x0B)

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OBJ1 0xFFFFFF 0x63A5FF 0x0000FF 0x000000
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(0x00/0x00)

 BG 0xFFFFFF 0xADAD84 0x42737B 0x000000
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0x18

(0x00/0x0B)

 BG 0xFFFFFF 0x63A5FF 0x0000FF 0x000000
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OBJ1 0xFFFFFF 0x63A5FF 0x0000FF 0x000000
0x19 BG 0xFFE6C5 0xCE9C84 0x846B29 0x5A3108
OBJ0 0xFFE6C5 0xCE9C84 0x846B29 0x5A3108
OBJ1 0xFFE6C5 0xCE9C84 0x846B29 0x5A3108
0x1A BG 0xFFFFFF 0xFFFF00 0x7B4A00 0x000000
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(0x00/0x16)

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(0x01/0x0B)

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0x07 BG 0xFFFFFF 0xFFFF00 0xFF0000 0x000000
OBJ0 0xFFFFFF 0xFFFF00 0xFF0000 0x000000
OBJ1 0xFFFFFF 0x63A5FF 0x0000FF 0x000000
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OBJ1 0xFF6352 0xD60000 0x630000 0x000000
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(0x00/0x16)

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(0x02/0x0B)

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(0x00/0x1B)

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BIOS/Firmware ROMs
Nintendo
ConsolesFamicom Disk System • GameCube • Wii (Prototype) • Wii U • Switch (Prototype)
FamicomBox • Demo Vision • NES Classic Edition • SNES Classic Edition
HandheldsGame Boy Color • Game Boy Advance (Prototype) • DS • DSi (Prototype) • 3DS • Game & Watch: Super Mario Bros.
Official AccessoriesSuper Disc • Super Game Boy • BS-X • Game Boy Camera (Hello Kitty Version) • GB Memory • 64DD • e-Reader • Game Boy Player
Unofficial AccessoriesStudyBox • Game Genie (Game Boy) • Pro Action Replay (NES) • Game Genie (SNES) • Pro Action Replay (SNES) (MK2, MK3) • Action Replay (GameCube) • GameShark (Nintendo 64) • GB Hunter • Tri-Star • XBAND (SNES) • Action Replay DS • Action Replay DSi
Arcade SystemsTriforce
Sega
ConsolesGenesis • Sega CD • 32X • Saturn • Dreamcast (Prototype) • Genesis Mini
AccessoriesSega Graphic Board v2.0 • Game Genie (Genesis) • Sega Channel (US) (Prototypes) • Visual Memory Unit
Arcade SystemsSega Titan Video • Sega Hikaru • Triforce
SNK
ConsolesNeo Geo • Neo Geo CD
Arcade SystemsNeo Geo • Hyper Neo Geo 64
Sony
ConsolesPlayStation • PlayStation 2 • PlayStation 3 • PlayStation Classic
HandheldsPlayStation Portable
Others
3DO3DO
Bit CorporationGamate
BrezzasoftBrezzasoft Crystal System
CommodoreAmiga CD32
GameParkGP32
JungleTac/KenSingTonVii
KonamiBubble System • System 573
LeapFrogLeapster • LeapPad • LeapFrog Epic
MicrosoftXbox • Xbox 360
NabiNabi SE
NamcoNA-1/NA-2 • Triforce
NECTurboGrafx-CD • United Amusements PC Engine
PhilipsCD-i
SammyAtomiswave
TimeTopGameKing
VTechV.Smile
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