Dig that GameBoy Advanced out of your closet for this GameBoy and PIC Microcontroller Hacked into an Analog Meter project. Ken Kaarvik used a PIC24HJ128GP502 to run the project, what is really cool is that the GBA doesn’t load the program from a cartridge but rather directly from the PIC microcontroller! This isn’t the first project that Ken has done with a Game Boy, have a look at lots more here.
“The GBA is able to link two or more systems together though it’s serial port and only requires a single cartridge to boot up both GBA’s. My circuit emulates the master GBA with the cartridge.“