I can go and check my notes from 25 years ago for you. Alternatively, why not drop Herb Johnson a line at his http://www.retrotechnology.com website? He probably has forgotten more about the CompuPro/Godbout boxes than I've ever learned. Cheers, Chuck On 9/8/2006 at 7:36 PM Richard A. Cini wrote: line Dunfield.

I have a Disk-1A up and running in my Compupro box - unfortunately I do not have a Disk-1 to test with. I do however have manuals for both controllers. are very similar, but not identical: - The Disk-1A appears to have some functions available in the write side of some registers which were read-only on the Disk-1 - these seem to control features that had to be set by switches or board modifications on the Disk-1. - The Disk-1 has a bit-bang serial port which has been dropped on the 1A. - The difference is NOT the difference between a 765 and a 765A - both manuals list the 765A as the NEC FDC. - The 765 and motor control registers appear to be in the same place on both controllers. I have a set of original Cromemco CP/M diskettes, and the labels do NOT mention anything about a specific floppy controller board - my guess is that the disks would boot and run on either controller. (But as noted above, I cannot confirm this, so it is just a guess). Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html