[Coco] TC-9

[jdaggett at gate.net]

I to am an ex Mot employee. I knew a couple of the SPS eng in Austin and 
a few in Plantation and Boynton Beach. I seem to remeber that mixed 
bipolar and NMOS was not real successful in the late 70's. 

I told one manager back in 1999 that the HC11 would have been a better 
processor if it had the 6809 core with the peripheral integrated around it. 

AH but those were the days. 

james 

On 8 Jul 2008 at 0:59, LinuxRules wrote:

> jdaggett at gate.net wrote:
> > On 7 Jul 2008 at 22:13, Chuck Youse wrote:
> >
> >   
> >> On Mon, 2008-07-07 at 21:49 -0400, jdaggett at gate.net wrote:
> >>
> >>     
> >>> The only analog functions are the composite video from the
> >>> internal DAC the RGB DAC and the oscillator circuitry on board.
> >>> The oscillator and its quadrature phase is rather easy to do in an
> >>> FPGA given the modern DLL/DCM in most chips. 
> >>>
> >>>       
> >> The composite signal by itself will be a bitch.  And don't forget
> >> the drive requirements on the E clock.  Anyway, the point is it'd
> >> require external components, an FPGA alone won't suffice, but I
> >> think we agree on this point.
> >>
> >>     
> > ------------------------
> >
> >  Yes it is but is doable. The MC6809 with internal clock, the E and
> >  Q clock 
> > source current is 2 mA. The chip is depletion load NMOS technology.
> > I am not sure of the geometry of the output transistors on teh
> > clock. The spec is 2 mA so they may very well be NMOS and not
> > bipolar. 
> True.
> Being an ex-Mot guy from that group at that time, we had no bipolar
> "recipes" available to the MPU/MCU designers. Everything was Dep Loads
> (and d at mn glad to have 'em!) until the 146805 7 146818 came along.
> [6800(redesign), 6801/02/08, first 6805s, 6809, et al.......]
> 
> Been lurking for a while, and I'm blown away by the talent
> demonstrated here. Sure wish we had had some of you folks back then!!!
> cheers, johnd
> 
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