[Coco] 68B09E on coco2

[embsys dev]

After reading this

http://www.cs.unc.edu/~yakowenk/coco/text/speed.html

I understand what is technically possible, what is useful, and the
underlying reasons why.

Can anybody confirm that a *genuine* MC68B09E *should* boot a coco2 at
0.89M?  If that is so, then it seems reasonable to conclude my chip is
mislabeled and order another from somewhere else.






On Sat, Feb 7, 2015 at 10:39 PM, Arthur Flexser <flexser at fiu.edu> wrote:

> I know of no advantage to using a 68B09E in a CoCo 1 or 2.  It does not
> allow "stable operation at 1.7 MHz".  The video at that speed will be just
> as unstable as with a regular 6809.
>
> Art
>
> On Sun, Feb 8, 2015 at 12:11 AM, embsys dev <embsysdev at gmail.com> wrote:
>
> > coco2, 26-3026 (socketed chips, melted kbd), 64k ram.
> >
> > I recently bought an MC68B09E from Jameco, but when I swapped it in all I
> > got was interesting colors and patterns, no sign on.  I understood
> (perhaps
> > wrongly?) this was a drop-in upgrade that would allow stable operation at
> > 1.7MHz.  I noticed some list discussion about Jameco having mislabeled
> > chips,  any way to rule this in/out by inspection?
> >
> > Comments and advice?
> >
> > Thanks,
> > Darryl
> >
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