Developer information and hardware specs for the MultiFaceCard 2 and 3 serial/parallel cards from bsc. This package includes autodocs, include files and general hardware info which I have collected during the time I wrote the MFC driver for ProNET.
This is perhaps the most comprehensive collection you can find about this card. Also interesting for you might be the Linux/m68k kernel sources, the AmigaOS MFC plip.device and the Motorola web site, which (as opposed to my statement in the archive README) does contain an order form for data sheets and reference material for all their products (including the MC6821 used on the MFC3).