Arduino Uno

somewhere on the ethernet shield

Corner
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PS/2 keyboard

The librabry from the bottom link provides an easy interface to read ou a connected PS/2 keyboard. It provicdes immediate ASCII conversion, but lacks, in my opinion, some low-level retrieve the sent data (instead of the translated ASCII character).

Anyhow, this library allows any projet to interact with the outside by using many keys ;-)

Links

 PS2Keyboard Library

 Arduino playground