DECstation 220 Impasse Reached

Rob Jarratt robert.jarratt at
Fri Jul 28 12:21:33 CDT 2017

So the vertical range of the signal is about 0-5V (about 2V per division) ,
I can't remember the timebase though, but I think it was about 0.1us per
division. I will do it again (later) with more info. The signal was found on
a data pin of the 80286.



> -----Original Message-----
> From: Paul Koning [mailto:paulkoning at]
> Sent: 28 July 2017 18:17
> To: rob at; Robert Jarratt <robert.jarratt at>;
> Discussion: On-Topic and Off-Topic Posts <cctalk at>
> Subject: Re: DECstation 220 Impasse Reached
> > On Jul 28, 2017, at 1:04 PM, Rob Jarratt via cctalk
<cctalk at>
> wrote:
> >
> > Anyone have any thoughts on whether those data signals look right?
> It's hard to guess at signals when the horizontal and vertical scales are
> stated, nor where in the circuit the signal was found.
> 	paul

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