Brian (brijohn of NABU MAME fame) created a PDF describing how to modify an Atari paddle controller for use with the NABU computer, as well as describing how the keyboard sends the analog data to the NABU PC.

For those interested in this sweet Atari paddle controller modification, you can snag the PDF from the NABU Network Resources page under Documentation.

All we need now is a nice port of Arkanoid with proper paddle support for the NABU PC