[Coco] 3.5" drives on coco 3

[Robert Gault]

Bruce W. Calkins wrote:

> It looks to me that several modules will need rewriting for OS-9/NitrOS9 
> to boot off from drive 1.  The hardware solution is much easier for me.
> 
> Bruce W.
> 

Depending on the version of software in use, Boot most definitely needs 
to be patched as the default is /D0. You can probably get away with 
redefining /DD as the only other change if Init and cc3go/sysgo make use 
of /DD instead of a specific drive.

The source code for NitrOS-9 Boot has the provision for selecting /D0 
through /D3. If you don't want to recompile, dEd could be used. Just 
look for values being sent to $FF40 and adjust them for the required 
drive#. Remember to verify the module after any changes.