USB keyboard controller for IBM's capacitive "beam-spring" keyboards.
Specifically concerns beamsprings with a 2x30-pin edge connector and 23
columns/4 rows. Has been tested successfully on a 5251 and a 3727.

The schematic and PCB layout are under schem/.

Source for the ATmega32U2 (using Dean Camera's LUFA
<http://www.fourwalledcubicle.com/LUFA.php> for USB support) is under src/.

Under src/util/ is some test libusb code for accessing the diagnostic interface
implemented over HID.

-Tom Cornall, 2013 <tom@cornall.co>
