[Coco] Floppy format questions

Neil Cherry ncherry at linuxha.com
Mon Jun 17 15:38:37 EDT 2019

On 6/17/19 1:40 PM, David Ladd wrote:
> On Mon, Jun 17, 2019 at 11:42 AM Neil Cherry <ncherry at linuxha.com> wrote:
>> I recall that OS9 had a unique (at least I thought so) format/layout
>> for the floppy disk. Something odd about one of the tracks (I think).
>> Can someone point me to a link with the information. I'm trying to
>> setup a Gotek device with the correct floppy layout to start with.
>> I do have a bunch of floppy drives (5 1/4 and 3 1/2 & 40 and 80 track)
>> but it has been so long since I've used them. I'm betting they'll need
>> more than a clean up.
> http://www.colorcomputerarchive.com/coco/Documents/Manuals/Operating%20Systems/OS-9%20Technical%20Reference%20(Tandy).pdf
> PDF page 65 is the start of the information you might be looking for.
> The thing is that the default sector count is the same.  18 (256 byte)
> sectors per track.
> Disk Basic is tracks 0-34 single sided only.
> OS-9 can do double sided floppy disks and go up to 80 tracks or more
> depending on what the actual drive itself can handle.
> Disk Basic stores its special information on track 17 where as OS-9 stores
> its volume information in LSN0 like most other OS's of the time did.
> I hope this is helpful. :D

Yes it is, thanks

Linux Home Automation         Neil Cherry       ncherry at linuxha.com
http://www.linuxha.com/                         Main site
http://linuxha.blogspot.com/                    My HA Blog
Author of:    	Linux Smart Homes For Dummies

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