Using two resistors, a blue LED, a few other bits, and a kernel module you can use a PS/2 keyboard by connecting it to the Pi serial port. This works because I have found that you can read a keyboard without using the keyboard clock line if you use a serial port running at a custom speed. This works so long as the keyboard clock period is regular, which I have found to be the case with all keyboards I have tested

ps2pi
.....\CHANGELOG
.....\COPYING
.....\probe.c
.....\ps2pi.c
.....\ps2pi.htm
.....\ps2pi_files
.....\...........\finished.png
.....\...........\layout.png
.....\...........\ps2-pi.png
.....\ps2test.c

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