[Coco] C+ Dos

[L. Curtis Boyle]

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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