[Coco] Kip's Single Board Computer

[Neal Crook]

Two suggestions..

Double check that you have a 6809 and not a 6809E (sorry but I had to ask).

Use the crystal to breadboard a standalone pierce oscillator (google the
circuit) using a74S04 or some such. If you can get this to oscillate,
jumper across with a 10k resistor to one or other xtal input of the 6809
(maybe either input will work or maybe only one of them will work). If you
cannot get it to oscillate maybe the crystal is bad or the wrong cut for
the biassing)

Happy debugging

Neal
On 18 Sep 2015 4:00 pm, "John W. Linville" <linville at tuxdriver.com> wrote:

> On Thu, Sep 17, 2015 at 09:39:17PM -0500, RETRO Innovations wrote:
> > On 9/15/2015 12:28 PM, John W. Linville wrote:
> > >Anyway, I would suggest something approaching 100mS.  Since Kip seems
> > >to have a 2.2Kohm pull-up on RESET^, maybe a 47uF capacitor from
> > >there to ground?  Of course, that ignores the R10 and LED path...you
> > >may have to try some different cap values if that doesn't work...
> > I pulled the 6309c and put it on a breadboard with 10K pullups on NMI,
> IRQ,
> > MRDY, HALT, RESET, etc.  I put a 10uF on RESET as well and powered it
> up...
> >
> > Nothing. :-(
> >
> > I tried my 6809 as well, to the same effect.  I don't doubt your advice,
> but
> > it looks like I have more I need to do to get this CPU to run.
>
> Sorry, that was the only obvious thing I see...I presume you have
> tried adding a manual reset switch and trying that too?  Probably makes
> no difference...
>
> John
> --
> John W. Linville                Someday the world will need a hero, and you
> linville at tuxdriver.com                  might be all we have.  Be ready.
>
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