All — I was able to obtain a Heathkit H11-2 parallel module and manual, and the H11 system manual. Each contains the diagram booklets, which is pretty key. Both are pretty rare from what I can tell. I’ll start scanning them and will post them to my site this weekend. Rich -- Rich Cini Collector of Classic Computers Build Master and lead engineer, Altair32 Emulator http://www.classiccmp.org/cini http://www.classiccmp.org/altair32