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I've had an Uzebox reading from a keyboard for some time now without using interrupts. The polling method used suffers from the initial wait time for a keyboard to start sending commands, and the actual long time it takes to transfer data. In practice this is only working well when the screen is VERY short around 18*8 scanlines, at some point I will instead work on an add-on ATtiny using polling to the keyboard and interrupts to transfer keystrokes in the same place it would process joypad states. Nothing impossible, just work. TODO