Proto:Sega Master System BIOS · the cutting room mirror

This page details one or more prototype versions of Sega Master System BIOS.

Two prototypes of the Master System BIOS are known to exist, both originating from demonstration units from Sega of America.

Sub-Pages#

M404 PrototypeThe earliest available version of the BIOS, with very different logos and almost no compatibility among released games.

v1.0 PrototypeHas the finalized logos and full game compatibility, but no Snail Maze.

v · t · e BIOS/Firmware ROMs

Nintendo
Consoles	GameCube • Wii (Prototype) • Wii U • Switch (Prototype) • Switch 2 FamicomBox • Demo Vision • NES Classic Edition • SNES Classic Edition
Handhelds	Game Boy • Game Boy Color • Game Boy Advance (Prototype) • DS (Prototypes) • DSi (Prototypes) • 3DS (Prototype) • Game & Watch: Super Mario Bros.
Official Accessories	Family BASIC (Prototype) • Famicom Disk System • Study Box • Super Disc • Workboy • Super Game Boy • BS-X • XBAND (SNES) • Game Boy Camera (Prototype, Hello Kitty Pocket Camera) • GB Memory • Wideboy64 CGB • 64DD • Mobile Trainer • e-Reader • Game Boy Player
Unofficial Accessories	Game Genie (Game Boy) • Pro Action Replay (NES) • Game Saver+ • Game Genie (SNES) • Pro Action Replay (SNES) (MK2, MK3) • Action Replay (GameCube) • GameShark (Nintendo 64) • GB Hunter • Tri-Star • Mega Memory Card (Game Boy) • CodeBreaker (Game Boy Advance) • Action Replay DS • Action Replay DSi
Arcade Systems	Triforce

Sega
Consoles	Master System (Prototypes) • Genesis • Sega CD (Prototype) • 32X • Saturn • Dreamcast (Prototype) Genesis Mini • Genesis Mini 2
Accessories	Sega Graphic Board v2.0 • Game Genie (Genesis) • Game Genie (Game Gear) • Sega Channel (US) (Prototypes) • Visual Memory Unit
Arcade Systems	Sega Titan Video • Sega Hikaru • Triforce

SNK
Consoles	Neo Geo • Neo Geo CD
Arcade Systems	Neo Geo • Hyper Neo Geo 64

Sony
Consoles	PlayStation • PlayStation 2 • PlayStation 3 (Prototypes) • PlayStation 4 (Prototypes) • PlayStation 5 (Prototypes) PlayStation Classic
Handhelds	PlayStation Portable (Prototypes) • PlayStation Vita (Prototypes)
Unofficial Accessories	Xploder CD9000 Version 4.0 • Memory Manager Plus

Microsoft
Consoles	Xbox (Prototypes) • Xbox 360 (Prototypes) • Xbox One (Prototypes) • Xbox Series X and S

Others
3DO	3DO
Atari	Atari Flashback • Atari Flashback 2 • Atari Flashback 5 • Atari Gamestation Pro
Bandai	WonderSwan Color
Bit Corporation	Gamate
Brezzasoft	Crystal System
Commodore	Amiga CD32
GamePark	GP32
International Games System	PolyGame Master
JungleTac	Vii • Zone 60 • Wireless 60
Konami	Bubble System • System 573 TurboGrafx-16 Mini
LeapFrog	Leapster • Leapster2 • Didj • LeapPad Explorer • Epic • LeapTV
Nabi	Nabi SE
Namco	NA-1 and NA-2 • Triforce
NEC/Hudson	TurboGrafx-CD • United Amusements PC Engine
Philips	CD-i
retroUSB	AVS
Sammy	Atomiswave
TimeTop	GameKing
Tsukuda Original	Othello Multivision
VTech	V.Smile • V.Smile Baby

See Also
Handheld • Mini Console • Plug & Play • Specialized Console