This Game Boy has been brought back to life in full glory using a Raspberry Pi A+ board and an Adafruit color screen. It can be powered on/off with the original switch and has added buttons to allow for emulating all the Gameboys up to the Advance, the NES and SNES, Genesis, Atari and whatever other similar systems the RetroPie operating system allows with a SNES style controller. An internal battery gives ~5 hours of play time and can be charged without being removed. I am undecided about installing berryboot to allow a dual boot with openELEC as well. The keybindings will probably be the deciding factor on this, as well as wifi support, since this board has no ethernet and only one USB port.
Components
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Raspberry Pi Model A+
The smallest Raspberry they make. Helps for the space constraints
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Adafruit Color Screen
Links coming for which screen works best
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Original Game Boy
Houses all the new internals
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USB Gamepad
This will be hacked apart. Used for the buttons
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USB Battery Pack
Needs to output a minimum of 1A. The smaller in size the better. Space inside the Game Boy is limited
Sorry for the slow response. Having a hard time sourcing a broken Game Boy that is in decent cosmetic condition for this project. I cant bring myself to dismantle one that still works.