[Coco] Reading the RS-DOS part of a VHD (or CF/HD)

[Gene Heskett]

On Tuesday 28 May 2013 23:41:39 Bob Devries did opine:

> Oops, I forgot one vital bit of detail...
> 
> How do I access the Disk BASIC virtual disks from OS-9. On a *real*
> Coco3 with SuperIDE
> 
> Sorry. my bad.
> 
> Regards, Bob Devries
> Dalby, QLD, Australia

If you are using the SuperIDE, then there s/b an IH.dd descriptor, but you 
will probably need to configure it, and save the configured one where you 
can make boot disks using it.

Configuration in its simplest essence consists of telling it an offset 
value that is one sector greater than DD.SIZ from the first 3 bytes of the 
hard drive in most cases.

I don't have mine booted ATM, but near the end of the dmode output when 
doing a "dmode /IH" or for a disk file "dmode -ih.dd", and you will see an 
OFS= and one more byte whose name escapes me ATM.  Copy DD.SIZ's 3 bytes, 
adding one to the final byte, into those locations in the ih descriptor.

Note too, reading in the superdesc doc, that the stp value is the HDBDOS 
disk stated in hexidecimal, where $80 there means virtual disk 128.
 
> ----- Original Message -----
> From: "Robert Gault" <robert.gault at att.net>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Wednesday, May 29, 2013 12:42 PM
> Subject: Re: [Coco] Reading the RS-DOS part of a VHD (or CF/HD)
> 
> > Bob Devries wrote:
> >> Hi all,
> >> 
> >> I'm sure I read about accessing the 256 virtual Disk Basic disks on a
> >> VHD or CF/HD drive, but I can't find the reference.
> >> 
> >> Can someone enlighten me if this is possible, and how?
> >> 
> >> Regards, Bob Devries
> >> Dalby, QLD, Australia
> > 
> > Assuming the .vhd drive is formatted on those 256 drives you can I/O
> > them if you are using an RGBDOS or HDBDOS ROM. The distribution of
> > VCC makes use of my RGBDOS ROM for emulators and gives access to such
> > a disk.
> > 
> > If you are using MESS instead of VCC, I can supply you with a ROM
> > image. If you have a Cloud-9 system and HDBDOS, you should be set.
> > Both the Cloud-9 site and my site hosted by Aaron
> > http://aaronwolfe.com/robert.gault/Coco/Downloads/Downloads.htm
> > have documentation on how these DOS should be used and a command list.
> > 
> > Robert
> > 
> > 
> > 
> > 
> > 
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> 
> --
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Cheers, Gene
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