I did the same thing for an OSI system a few months ago. Look in the list archive. In brief: 1) using the second set of pinouts in the comp.os.cpm faq worked best for me. 2) build your converter on a Radio Shack Experimenters board (part no. 276-168B). Works very well. 3) use 22disk version 1.31 or earlier. Newer versions have timing problems with 8 inchers.