[Coco] 1.2 mb floppy

[mike delyea]

Great stuff!  Really useful info for me.

On 5/11/07, Phill Harvey-Smith <afra at aurigae.demon.co.uk> wrote:
>
> mike delyea wrote:
> > Can I use my 1.2mb floppy with OS-9/NitrOS-9?  Could I split up my
> > 1.2mbfloppy into 2 720k drives or 4 360k drives?
>
> Nope I don't think you can, you may be able to set the drive to run in
> standard double density, and then you would be able to use it as a 720K
> drive. What model of drive is it someone on here may have the correct
> settings for it.
>
> > I read somewhere that you couldn't use the 1.2mb floppy to write coco
> > or OS-9 360k disks.  This doesn't seem to be true because I used my
> > 1.2mb to write my NitrOS-9 disks from an image.
>
> Yeah I have also done this with Dragon 180K disks, and had no problems,
> of course they where first formatted on the Dragon.
>
> >                                               Does anybody know it
> > the dmode numbers for the step rate are the actual step rate?  For
> > example is stp=03 a 3ms step rate and so on. Whats the fastest step
> > rate thats usable?
>
> That will depend on the drive I guess start with the slowest, do some
> tests that access files on the disk, such as running programs off it. If
> that seems ok, use dmode to drop the step rate, then test again till it
> fails (if it fails, if the drive is up to 3ms, then it won't fail :) ).
> Used this method to determine the correct step mode for the Dragon Data
> supplied drive units.
>
> Chances are that it probably will work at 3ms, so you could of course
> set it to that and see if it works, and go the other way :)
>
> oops, just noticed what you where actually asking, will leave the above
> in because it may also be usefull to you.
>
> IIRC step rates are :-
>
> STP=
> 00      30ms
> 01      12ms
> 02      06ms
> 03      03ms
>
> I think these are documented on the WD177x / WD279x data sheets.
>
> Cheers.
>
> Phill.
>
> --
> Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !
>
> "You can twist perceptions, but reality won't budge" -- Rush.
>
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