I have had better luck with a P-III motherboard that connects to the 34-50 pin adapter in the middle and 8" on the other end. This way you can trick the BIOS of the computer to think the 8" drive is a 1.2Mb 5 1/4". With this set up I have made a bootable DOS 6.22 8" disk, so I know it works. THEN use the USB port to copy files as a separate drive. The USB to floppy devices are pretty good for 3.5" but I would not expect a direct adapter from the 8" to be reliable. Bill
On Fri, Sep 8, 2023 at 3:59 PM Anders Nelson via cctalk < cctalk@classiccmp.org> wrote: > Hi all, > > I just bought a very clean, DSDD 8" disk drive off eBay and it has a 50p > connector which I guess is the common Shugart type? I also found a 50p-> > 34p adaptor PCB design someone documented online. > > I haven't delved much into floppy formats (high level or low level) but I'm > somewhat familiar with filesystems from FAT12. My ultimate goal is to > create an open-source USB adaptor that reads/writes the contents of an 8" > disk but presents itself to an OS as a Mass Storage Device (block device). > Is such a thing possible? > > I once created a terrible custom format for storing data on a flash chip > which required no low-level format, but I expect a magnetic disk needs > headers/trailers to know when a track starts/stops so it can skip around. > > I checked out the KyroFlux website and it seems there are dozens of formats > that were used for 8" disks - is there a favorite format among the > community that allows full use of a 1.2MB 8" disk? > > Any pointers are appreciated! > > Anders > www.andersknelson.com >
