A Game Boy capture cartridge #Gameboy #Nintendo #RaspberryPi @Raspberry_Pi @diconx

The GB Interceptor is an adapter that goes between an unmodified Game Boy and the cartridge and offers a video stream of the game via USB.

The only connector with game data that is accessible on a Game Boy without a mod is the cartridge slot. The idea is to create an adapter that connects the cartridge to the Game Boy directly and only adds the capability to intercept a copy of the transferred data.

To do so, I had to write an emulator to which I feed the data from the cartridge memory bus. For this I use an RP2040 (the Raspberry Pi Pico’s microcontroller) and split its cores to the two main processing parts of the Game Boy. One core emulates the CPU to recreate a copy of VRAM and the other core emulates the Game Boy’s graphics unit, the PPU.

…with the overhead of emulating an 8-bit CPU on a 32-bit CPU, (it) made it necessary to overclock the RP2040 from its default 125 MHz5 to 225 MHz. The RP2040 can usually handle this without any problems

See the video below and more in the article and on GitHub.

 


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