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I wonder how feasible it would be to get a keyboard hooked up to a Gameboy through the serial port. It looks like it should be possible from a cursory reading of https://gbdev.io/pandocs/Serial_Data_Transfer_(Link_Cable).h...

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Certainly possible and probably not too hard, there are code examples from the late 90's and early 2000's for using ps2 keyboards. But not enough people have the keyboard link port adapter to make it worth implementing.

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