Game Boy cartridge to Game Gear adapter

December 25, 2025 · View on GitHub

This adapter was designed to be used with reflashable Game Boy Cameras running the Game Gear version of the "Photo!" ROM, which is a custom Game Boy Camera ROM. It can be downloaded here: https://github.com/untoxa/gb-photo/releases/latest/

In addition to "Photo!" this adapter can be used to run your own Game Gear homebrew ROMs on reflashable Game Boy carts. However this adapter will not allow playing Game Boy games on the Game Gear without rewriting them.

TODO: add details

Schematic

Showcase

Bill of materials (BOM)

Chips:

IDSovietName
DD1К555ТМ2SN74LS74
DD2К555ЛП5SN74LS86
DD3, DD5К555ЛН1SN74LS04
DD4К555ЛЛ1SN74LS32

Other:

  • One 10 KOhm resistor
  • Three 104 ceramic capacitors
  • One Game Boy Cart connector
  • One PLD 2,54mm two row male connector
  • One PLD 2,54mm two row female connector
  • The standard Game Gear cart shell

Photo! running on the Game Gear using the GameBoy-to-GameGear adapter:

Showcase