How to read Osborne 1 Floppies?

Dunfield's ImageDisk reads and writes them just fine on most older PCs with a decent floppy controller. As Chuck G writes "TestFDC" will tell you if the floppy controller is usable for imaging. Best regards Tom Hunter On Tue, May 25, 2021 at 2:26 AM Fred Cisin via cctalk <cctalk at classiccmp.org> wrote: > There were two Osborne floppy formats. Both CP/M. > > IIRC, the original format was "Single Density" (FM), 10 sectors per track, > with 256 bytes per sector (similar to the TRS80-Model-1. That will > require FM/SD capability. Most NEC FDCs did not support that. Dave > Dunfield has a test program that will tell you whether your FDC can handle > it. > > Then, they switched to "Double Density" (MFM) IIRC: 5 sectors per track, > with 1024 bytes per sector. Any PC FDC with access to INT13h and INT1Eh > will work with appropriate software. (NOT external USB drives) > > > WITH appropriate software, a flux transition device, such as your > Catweasel, could do it. > > > > On Mon, 24 May 2021, Zane Healy via cctalk wrote: > >> A photographer I know contacted me last night asking about reading > Osborne 1 floppies. What does it take to read these? >> >> The only Catweasel board I have is the old Zorro 2 board for the Amiga. > I do have 5.25??? floppy drives. Neither of us have an Osborne anymore (I > think mine went to Jim Willing). >> >> Zane