[Coco] CoCo 1 troubles

Arthur Flexser flexser at fiu.edu
Tue Dec 22 12:58:53 EST 2020

If you can get a DIR and the drive light goes on and off rather than
staying on all the time, then the cable is not upside down.


On Tue, Dec 22, 2020 at 11:35 AM Salvador Garcia via Coco <
coco at maltedmedia.com> wrote:

>  Thanks Art and Curtis!
> My intention is to upgrade to a 6309, taking advantage that the uProcessor
> is socketed.
> Currently, that is easier said than done. I have a spare 6309; however,
> right now I am vacationing at my other home in Mexico. I moved all my PC
> gear here when we (Mom. Dad, sister, and I) moved to Mexico back in the
> 80s. All my CoCo stuff is here, with exception of the new stuff that I have
> bought recently (last few years).
> This means that I will have to wait to my next visit to upgrade to the
> 6309, as well as swap keyboards.
> Additionally, I recall that the IO error could be something trivial. I
> don't have a cable replacement (here or in the US), so I can't immediately
> swap that out, but I have plenty of time to purchase one in the coming
> months.
> I would like to go back to basic* and verify that, to begin with, I have
> the flat cable connected correctly. The cable has a line of a different
> color which indicates pin 1. (It is usually red, but here is it a dark
> gray).This line is to the right of the cartridge. Said another way, when
> the cartridge is plugged in, the different colored line is towards the rear
> of the CoCo. I am assuming this is "pin" 1.
> The different colored line is at the the top of the floppy drive's
> connector. This is a vertical unit, so in this case, pin 1 is at the top. I
> assume this is the correct way to connect the cable.
> A behavior I noticed is that when the CoCo attempts to access the floppy
> drive (when using dskini0 or Dir) there is visible RF interference on the
> flat panel TV that I am using. Aside from the fact that the CoCo's screen
> looks terrible, the interference is noticeable when the drive is accessed.
> As an additional note, right now I am using an RF to RCA adaptor to
> connect the CoCo's video out tot he TV's RF in. Another plan is to get
> better video on this unit, but first things first :-)
> Thanks! Salvador
> * I haven't decided whether I meant this as a pun or not.     On Tuesday,
> December 22, 2020, 12:55:38 AM CST, L. Curtis Boyle <
> curtisboyle at sasktel.net> wrote:
>  I have had that HALT problem too, and it was the CPU. At this time , you
> could replace it with a 6809 or 6309.
> Sent from my iPhone
> > On Dec 21, 2020, at 11:23 PM, Arthur Flexser <flexser at fiu.edu> wrote:
> >
> > ´╗┐The inability to format a disk also suggests a possible 6809 problem,
> > specifically with the HALT line.  For $6 or $8 bucks or so, you could
> order
> > a new 6809E.  Worth the gamble, in my opinion, assuming you cannot borrow
> > one from another computer or elsewhere.  (This is assuming the disk drive
> > works correctly for functions other than formatting.)  If the HALT line
> is
> > not working right, you should also see trouble when you try to read or
> save
> > a very long file, or try to boot up OS9..
> >
> > Art
> >
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