[Coco] 3 1/2 drive on coco and drive 0-3 on one ribbon cable

[Arthur Flexser]

If it were not for the SDC, I'd recommend Extended ADOS-3 (assuming you're
talking about a CoCo 3), which I'm sure someone here could burn for you.
It allows you to have different numbers of tracks on different drives, as
well as enabling temporarily assigning a drive number to a RAMdisk that is
built in.  But I assume you need special software for the SDC, so you'd
probably be best off with SDC-DOS, whose capabilities I know next to
nothing about.  Does it support floppies with 40 or 80 tracks, double-sided?

Art


On Thu, Aug 31, 2017 at 4:13 PM, Rietveld Rietveld <rietveldh at hotmail.com>
wrote:

> Thank you for the fast response. Both Arthur and Barry.
> I seldom use OS9 since most of the programs I use run under DECB.
>
> Is ADOS the preferred way to treat drive 0 and 1 as drive 0/1 and 2/3 with
> my FD502?
>
> If so ' since I don't have a way to burn a new ROM, is there a way to have
> my SDC auto EXEC ADOS instead of the explorer?
>
> Sent from my BlackBerry Passport Red Edition.
>   Original Message
> From: Arthur Flexser
> Sent: Thursday, August 31, 2017 3:54 PM
> To: CoCoList for Color Computer Enthusiasts
> Reply To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] 3 1/2 drive on coco and drive 0-3 on one ribbon cable
>
>
> 1.  DECB will only format the first 35 tracks of the drive unless patched.
> ADOS-3 (and perhaps some other modified DECBs) has such a patch, but after
> formatting 80 tracks under ADOS-3, you still wouldn't be able to access the
> upper tracks except under such a modified DOS, or under OS-9.  If you wrote
> to such a disk under standard DECB, it would wipe out the portion of the
> GAT devoted to the upper tracks and make the disk partially unreadable even
> if you went back to a modified DECB.
>
> 2.  I think 4 physical drives as you describe would be recognized under
> DECB, but you'd only have access to each one as 35-track single-sided
> without a modified DECB or OS-9.
>
> Art
>
> On Thu, Aug 31, 2017 at 3:00 PM, Rietveld Rietveld <rietveldh at hotmail.com>
> wrote:
>
> > Two questions pls:
> >
> > I replaced my 5 1/4 drive 1 with a 720k 3 1/2.   When I do a DIR 1 it
> > reads the drive, but when I DSKINI 1 it will only format the disk to
> 158k.
> >  Will DECB format the full 720k?
> >
> > Question two
> >
> > I want to hook up this dual drive FD502 inline with another FD502 and
> dual
> > drive to have three physical 5 1/4 drives and one 3 1/2 drive.
> >
> > If I replace both ribbon cables with one from cloud nine that has a card
> > conector on one end for the controller and for connectors on the other
> end
> > for the four physical drives will the one FD502 controller and the coco
> > recognize this setup as drive 0-3
> >
> > Thanks
> >
> >
> > Sent from my BlackBerry Passport Red Edition.
> >
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