[Coco] C+ Dos

Tue Aug 28 13:46:57 EDT 2018

Those early full height drives not only had a slow stepping rate (20 ms),
but also couldn't handle a full 40 tracks, which is why RS chose 35 tracks
as the CoCo standard.  I think they were physically capable of 37 or 38
tracks only.

A number of third party vendors of disk drives offered them in combination
with a controller with a modified RSDOS to take advantage of the 6 ms
stepping rate their drives were capable of.  That's why Rietveld ran into
the situation of having a controller that wouldn't work with his early
drive.

Art

On Tue, Aug 28, 2018 at 10:02 AM, L. Curtis Boyle <curtisboyle at sasktel.net>
wrote:

> The original full height (I believe TEC) drives could only handle 30 or 20
> ms stepping rates. Later drives could handle 12 and 6 as well.
> DECB defaulted to 30. Sands of Egypt used 20, if I recall correctly.
>
> Sent from my iPhone
>
> > On Aug 28, 2018, at 3:44 AM, rietveld rietveld <rietveldh at hotmail.com>
> wrote:
> >
> > Yes. You are right.   You can hear the drive stepping at the higher rate
> then failing with an I/O error.   This happens when I use the CDOS with a
> early style full height drive(3029).   When I connected the CDOS controller
> to a later model fd502 it works fine. I guess the full height drives can't
> handle the faster step rate?
> >
> > Sent from my BlackBerry 10 smartphone.
> >  Original Message
> > From: Arthur Flexser
> > Sent: Tuesday, August 28, 2018 5:17 AM
> > To: CoCoList for Color Computer Enthusiasts
> > Reply To: CoCoList for Color Computer Enthusiasts
> > Subject: Re: [Coco] C+ Dos
> >
> >
> > What exactly happens when you try DIR or LOADM?   Do commands like PEEK
> > work that don't involve disk access?
> >
> > Is it possible that CDOS is trying to do disk access using a faster step
> > rate (6 ms?) than your drive can handle (30 ms is the Tandy default).
> >
> > Art
> >
> > On Mon, Aug 27, 2018 at 9:22 PM, rietveld rietveld <
> rietveldh at hotmail.com>
> > wrote:
> >
> >> I found CDOS in the archive
> >>
> >>
> >> I still need to figure out why it is not working with my drive
> >>
> >>
> >> http://www.colorcomputerarchive.com/search?q=c-dos&ww=0&cat=&cs=0
> >>
> >> TRS-80 Color Computer Archive<http://www.colorcomput
> >> erarchive.com/search?q=c-dos&ww=0&cat=&cs=0>
> >> www.colorcomputerarchive.com
> >> TRS-80 Color Computer Archive
> >>
> >>
> >>
> >>
> >> ________________________________
> >> From: Coco <coco-bounces at maltedmedia.com> on behalf of Arthur Flexser <
> >> flexser at fiu.edu>
> >> Sent: August 27, 2018 7:56:40 PM
> >> To: CoCoList for Color Computer Enthusiasts
> >> Subject: Re: [Coco] C+ Dos
> >>
> >> It had some extra commands.  There may be documentation for the various
> >> Disto products, including CDOS in some CoCo archive.  Or CDOS may have
> been
> >> reviewed in Rainbow or other CoCo magazines.  (I just did a quick google
> >> search but no luck in finding the CDOS command list.)  I do remember
> there
> >> was a command that would reserve a screen line for a clock display.
> CLOCK
> >> ON, maybe.  Designed to work with DIsto's real-time clock in the
> >> controller.  But if DIR doesn't work, you have some other problem.  In
> >> addition to cleaning the edge contacts, you could try reseating the CDOS
> >> ROM in its socket.  (I'm assuming that the plus in C+ DOS indicates it
> is
> >> somebody's homebrew modification of CDOS, but it might be something else
> >> entirely.)
> >>
> >> Art
> >>
> >> On Mon, Aug 27, 2018 at 7:09 PM, rietveld rietveld <
> rietveldh at hotmail.com>
> >> wrote:
> >>
> >>> thank you.    Do you kknow what the differences were between standard
> >>> rsdos?
> >>>
> >>> ________________________________
> >>> From: Coco <coco-bounces at maltedmedia.com> on behalf of Arthur Flexser
> <
> >>> flexser at fiu.edu>
> >>> Sent: August 27, 2018 4:34:31 PM
> >>> To: CoCoList for Color Computer Enthusiasts
> >>> Subject: Re: [Coco] C+ Dos
> >>>
> >>> CDOS was from CRC Systems of Montreal, who are better known for the
> Disto
> >>> controllers and other hardware
> >>>
> >>> Not compatible with the CoCo 3, (maybe they came out with CDOS-3 later)
> >> but
> >>> stuff like DIR and LOADM should work on a CoCo 1/2.  Maybe clean the
> edge
> >>> connectors?
> >>>
> >>> Art
> >>>
> >>> On Mon, Aug 27, 2018 at 4:28 PM, rietveld rietveld <
> >> rietveldh at hotmail.com>
> >>> wrote:
> >>>
> >>>> I just received a disk controller from a member of this list. It just
> >>>> displays a screen of garbage when in my coco3. When I power on my
> >> coco1/2
> >>>> with it it simply boots up saying ' C+ DOS'. None of the standard disk
> >>>> commands seem to work; like DIR,LOAD(M) ect
> >>>>
> >>>> Does anyone have info on this DOS
> >>>>
> >>>> Sent from my BlackBerry 10 smartphone.
> >>>>
> >>>> --
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> >>>>
> >>>
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