Interesting daughter board on the 4FDC in this ebay lot:
https://www.ebay.com/itm/Vintage-Lot-of-2-Cromemco-S-100-Boards-Z80-ZPU-CPU- 4FDC-Floppy-Disk-Controller/202903187221?hash=item2f3df8ef15:g:kGQAAOSwhKZeQ z9C (sorry if you have to paste the URL back together) I thought maybe it was the JVB FDCX4 but after looking at some pictures, it clearly is not. Looks like it just adds a data separator to the 1771? Anybody have one of these? Bill S.