likely the floppy controller doesn't support 80 tracks or high density.. most of the controllers of the era are ds/sd 40 track or dsdd 40 track.. are you able to format 720k? ds/dd 80 track?
Greg On Sun, Mar 24, 2019 at 2:38 PM Stephen Adolph <twospru...@gmail.com> wrote: > I'll start by saying this isn't an M100 or TPDD discussion, but just > looking to understand something. > > I have a Tandy Coco3 with a 3.5 inch floppy drive. The drive is a > standard PC drive and it is working well. > > Seems though that I cannot use 1.44 MB floppies in that drive. They don't > seem to want to format. > > I really don't understand where the problem could be. > - the drive and the floppy are compatible > - the disk is known good and formats at 1.44MB in a PC > - if it can support 135 TPI, why can't it support 35 TPI? > > Does anyone know what's going on? > > thx > Steve >
