[Coco] HDBDOS/drivewire discovery

[Willard Goosey]

On Sat, Jan 14, 2012 at 05:15:48PM +1000, Bob Devries wrote:
> My RSDISK programme was written to access the files on a virtual disk image 
> file. At the time, I did not envisage having multiple "disks" in a file.
> 
Yeah, it was before people started passing around *hard drive* images
in addition to floppy images.

> Having said that, it should be quite trivial to modify the source (which is 
> included in the archive on RTSI) to ask the user for a disk number (0 to 
> 255), and multiply that by 161280 to get the offset to the wanted disk in 
> the image file.

It certainly doesn't look bad.  Every example of your code that I've
seen has been clean and readable.  

> The only caveat I can think of is that for the above offset to work 
> correctly, the disks in the image *must* be 35 tracks, 18 sectors and 256 
> bytes per sector.

Which RGBDOS/HDBDOS images are.  Pretty much by definition, I believe.

Willard
-- 
Willard Goosey  goosey at sdc.org
Socorro, New Mexico, USA
I search my heart and find Cimmeria, land of Darkness and the Night.
  -- R.E. Howard