[Coco] CoCo Model 1 Cartridge Port

[Joel Rees]

Video not available (here).

On Sun, Jan 2, 2022 at 6:41 AM James Ross <jrosslist at outlook.com> wrote:
>
> So what your saying is your CoCo's never?
>
> https://www.youtube.com/watch?v=O_1ruZWJigo
>
> (Sorry, I could not resist!)
> James
> ________________________________________
> From: Coco <coco-bounces at maltedmedia.com> on behalf of Alex Evans <varmfskii at gmail.com>
> Sent: Saturday, January 1, 2022 5:32 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] CoCo Model 1 Cartridge Port
>
> My CoCo 2 didn't not bang heads in the 80s
> My CoCo 3 did not bang heads in the 90s.
> My new CoCo 1 does not bang heads.
> It dosen't matter which of the coco floppy controllers I have use, I do not
> get heads banging.
>  (26-3022, 26-3129, disto super controller II, or FD-501)
> It doesn't matter if I used an old RS full height drive, the half height
> drive I got with my 26-3129, the external drive that was also used with a
> TI-99/4a, or a 3.5" floppy drive. No head banging.
>
> If you have heads banging, it is a hardware issue like a bad track zero
> sensor on your particular drive.
>
> Head banging is normal on a C64 and some other systems.
>
>
> On Sat, Jan 1, 2022 at 11:24 AM Rick Ulland <rickulland1 at gmail.com> wrote:
>
> > The 'head banger bug' has been a CoCo tradition for decades. Maybe the
> > cheap 35trk ss drives?
> > A new old mystery.
> >
> >
> > On 12/30/21 11:03 AM, Alex Evans wrote:
> > > The coco recognizes the track 0 sensor line. It should not be banging the
> > > head. It should step to track 0 and know then that it is on track 0.
> > >
> > >
> > > On Fri, Dec 24, 2021 at 11:02 AM Rick Ulland <rickulland1 at gmail.com>
> > wrote:
> > >
> > >> On 12/24/21 8:48 AM, Charles Hudson wrote:
> > >>> Following your advice I moved the cable to the last connector (on the
> > >>> end with two connectors) and repeated the process of "dksini0".  This
> > >>> time the drive light came on and I could hear the stepper motor move
> > >>> the head.  I failed to count the steps - I was completely surprised -
> > >>> but a dozen steps or more activity ceased and the light went out.  The
> > >>> result on the screen once again stated IO ERROR.
> > >>>
> > >>> I then tried repeating the disk format.  This time I heard the
> > >>> mechanism straining; no regular repeated stepping and after a few
> > >>> steps with long pauses between them the activity ceased and I got
> > >>> another IO ERROR message.
> > >>>
> > >> I'd bet dollars to donuts Art is correct. The way a CoCo drive is
> > >> supposed to work, you turn it own. The head position is unknown. First
> > >> operation steps the head a whole buncha times, to make sure it's banged
> > >> against the end stop for a while. DECB still doesn't know the head
> > >> position, but assumes surely this is 0 and counts from here until death.
> > >> If the head doesn't move, or doesn't move properly, DECB doesn't know
> > >> and forges ahead until there is a read error.
> > >>
> > >> Pop the top, watch the show. Bring hair clipper oil for the dry slide
> > >> rails. And Merry Christmas.
> > >>
> > >> -ricku
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> --
> > >> Coco mailing list
> > >> Coco at maltedmedia.com
> > >> https://pairlist5.pair.net/mailman/listinfo/coco
> > >>
> >
> >
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > https://pairlist5.pair.net/mailman/listinfo/coco
> >
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco



-- 
Joel Rees

http://reiisi.blogspot.jp/p/novels-i-am-writing.html