Front panel switches - what did they do?

Paul Koning paulkoning at
Wed May 25 08:45:07 CDT 2016

> On May 24, 2016, at 9:49 PM, Jon Elson <elson at> wrote:
> On 05/24/2016 12:17 PM, Paul Koning wrote:
>> A couple of observations.
>> Taking the PDP-11 as a fairly typical example, the switches are "data" and "address".  While running, the data switches were visible to the software, and could do something if you wanted to (typically this wasn't done).
> Actually, all PDP-11s I used had one set of switches, that could be used for address or data, as appropriate to the operation. 

Oops, of course, you're correct.


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