This adapter allows to connect the keyboard from the Amstrad PCW to a modern computer using USB.
It is powered by an AT90USB AVR microcontroller, because these implement USB in hardware and make it easy to implement an HID device.
You need the LUFA USB stack to compile this project. I am not including it to avoid code duplication. Download and extract it yourself, or set the LUFA_PATH variable to where you already have it when compiling.