[Coco] 26-3022 Disk Drive and controller

[CoCoList for Color Computer Enthusiasts]

>From Art Flexser:

Gene, my guess would be it's a J&M controller, which used a Symantec
controller chip that nobody else used.  Though I've never before heard any
complaints about them not working at double speed.  (And I probably would
have, since Extended ADOS-3, like OS-9, did disk I/O in the double-speed
mode.)

Art


On Sat, May 10, 2014 at 11:33 AM, CoCoList for Color Computer Enthusiasts <
coco at maltedmedia.com> wrote:

> On Saturday 10 May 2014 11:25:19 CoCoList for Color Computer Enthusiasts
> did opine
> And Gene did reply:
> >  ----- Original Message -----
> >
> > From: " Bruce W. Calkins"
> >
> > >> Yes a later disk controller might be a little more reliable.
> > >> 26-3029, FD-500, FD-501 & FD-502 are all 5 volt units and work as
> > >> is with the CoCo 2 & 3.
> > >>
> > >> > And Gene did reply:
> > > So are all the "after market" controllers.
> >
> > One caveat; I have one third party controller (using some other
> > controller chip set) that does not need 12 volts, BUT it will not
> > function at double speed and therefore will not work with OS-9 level 2
> > on a CoCo 3.
> >
> Now you have my curiosity bump itching. When you get to feeling like
> digging it out, I'd be interested in what chips it did use?
> >
> > Bruce W. Calkins
> > brucewcalkins at charter.net
> >
> >
> > --
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>
>
> Cheers, Gene
> --
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>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
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>
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