[Coco] OS-9 and RS-DOS disk structures

[Gene Heskett]

On Thursday 01 January 2015 00:12:18 Allen Huffman did opine
And Gene did reply:
> On Dec 31, 2014, at 11:43 AM, Allen Huffman <alsplace at pobox.com> wrote:
> >> So, let's say you just want to copy real double-sided OS-9 disks to
> >> second disk. If that is the goal, just use BACKUP from Disk Basic
> >> or backup from OS-9. Disk Basic with 0=front and 2=back Drive A,
> >> 1=front 3=back Drive B You would just
> >> 10 BACKUP0TO1
> >> 20 BACKUP2TO3
> > 
> > This actually solves my problem. I am doing this on a real CoCo using
> > the CoCoSDC floppy drive emulator. The CoCoSDC emulates the WD1774
> > floppy controller, and can act like physical DRIVE 0 or DRIVE 1. It
> > redirects all of the WD1774 disk I/O to sectors inside of a .DSK
> > image on the SD card. You can turn off either drive so accesses then
> > go to the real floppy controller.
> 
> Nevermind. False alarm. It appears SDC-DOS may be intercepting the
> drive numbers. It fails to honor POKEing those values when using the
> .DSK images.
> 
> However, CoCoSDC also comes with stock DECB 1.1 in another bank, so I
> can type:
> 
> RUN @1
> 
> And poof! I'm now in normal BASIC with no SDC commands. If I mount my
> two images from SDC-DOS, then RUN at 1 to switch to DECB 1.1, I can do
> the pokes and it sorta works. At least, I am seeing DRIVE 0 and DRIVE
> 1 as I expect, and 2 and 3 are "something" else... DSKINI fails, but
> someone posted earlier than CoCoSDC doesn't expand on the format
> command or something.
> 
> I was able to DSKO$ to these "back side" drives and it gave no error,
> but trashed all the directories.
> 
> I'm getting closer, at least, but I'm starting to feel what I want to
> do I can't actually do from BASIC. I may be booting OS-9 sooner than I
> had planned ;-)
> 
> 		-- Allen

Only way to go Allen.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS