I'm (mostly) fluent in 68HC11 assembly language if needed...

Also, here's an interesting MIcrochip application note about making an ADB device using a PIC microcontroller. Looks like it provides a lot of the necessary info no matter what the microcontroller is!

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011062