Thankfully the STM32’s inputs are 5V tolerant, so things worked just fine. Simple Game Boy cartridges like Tetris were able to directly map a ROM device into the Game Boys memory space.

Tetris DX looks like the original ... an accelerometer built into the game cartridge! The accelerometer allows you to tilt the Game Boy Color to manipulate Kirby's movements in the game.

It starts with the classic Tetris on the Game Boy ... and a Pi Zero on the other to do the heavy lifting. Insert a Game Boy cartridge and it emulates the original to the point you’d never ...

Heck, I still own one of them on its original cartridge ... home theatre experience like Tetris Effect, a simple thing played on a battered old Game Boy in the park, or anything in between.