[Coco] 720k sssd

[Arthur Flexser]

On Sun, Feb 28, 2010 at 4:26 AM, Phill Harvey-Smith <
afra at aurigae.demon.co.uk> wrote:

> On 28/02/2010 05:34, Bob Devries wrote:
>
>> You need to realise that the default for the Coco whether DECB or OS9 is
>> DOUBLE DENSITY (DD), not SD. SD was used mostly on the early TRS-80
>> Model 1.
>>
>> Some versions of OS9 (but not the coco version) had track 0 in
>> single-density mode.
>>
>
> The Dragon Beta prototype's OS-9 was like this. A few years ago I needed to
> copy some of these disk a while back. So I modified the Dragon Nitros disk
> driver to support this, so it can be done on a DragonDos controler.
>
> Looking at the schematics of the RS-DOS controlers I see no reason why the
> driver for this controler could not also be mad to support this.


My impression is that CoCo copy-protection schemes frequently made use of
single-density tracks, so if my recollection is correct on this, they should
definitely be readable with a CoCo controller and appropriate software.

Art