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
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