DECstation 220 Impasse Reached

Rob Jarratt robert.jarratt at ntlworld.com
Fri Jul 28 12:04:12 CDT 2017


Anyone have any thoughts on whether those data signals look right?

 

Thanks

 

Rob

 

From: Rob Jarratt [mailto:robert.jarratt at ntlworld.com] 
Sent: 27 July 2017 21:18
To: General Discussion: On-Topic and Off-Topic Posts (cctalk at classiccmp.org)
<cctalk at classiccmp.org>
Subject: DECstation 220 Impasse Reached

 

Hello Everyone,

 

As I have mentioned before I have made some progress on a DECstation 220,
but I have reached an impasse. I get some signals on the data bus which I am
not sure about. They look odd, but they could be normal, I just don't know.
I took a picture of the scope trace, which is here:
https://rjarratt.files.wordpress.com/2017/07/decstation-220-data-signals.jpg
.

 

Any advice on whether that looks like a "normal" signal?

 

If anyone is interested, I have posted more details on general progress in
this blog posting: https://robs-old-computers.com/2017/07/27/decstation-220/

 

Thanks

 

Rob



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