interestingly, Yes, if I take an HD disk, and tape over the hole to make it appear to be a DD disk, then it works.
But why? the floppy is capable of both formats... On Sun, Mar 24, 2019 at 7:39 PM Mike Stein <mhs.st...@gmail.com> wrote: > Have you tried closing the HD sense hole with a piece of tape or similar? > > ----- Original Message ----- > *From:* Stephen Adolph <twospru...@gmail.com> > *To:* m...@bitchin100.com > *Sent:* Sunday, March 24, 2019 6:08 PM > *Subject:* Re: [M100] question regarding floppy disks. > > the Coco is using it's standard controller > > When issuing the DSKINI 0 command the coco tries to format for 180kB. > > The combination of > (Coco, std controller, PC 1.44MB drive + a 720kB dd floppy) works > > whereas > (Coco, std controller, PC 1.44MB drive + a 1.44MBB hd floppy) does not work > > this is something I don't understand! > > > > On Sun, Mar 24, 2019 at 5:42 PM Gregory McGill <arcadeshop...@gmail.com> > wrote: > >> 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 >>> >>
