Front panel switches - what did they do?

Bill Sudbrink wh.sudbrink at
Tue May 24 11:53:02 CDT 2016

I wrote:
> Swift Griggs wrote:
> > Machine Language Using a Program Listing Using Toggle Switches".
> > That's pretty hard core. I'm surprised they didn't at least use
> > component displays with LEDs to show the values rather than
> > reading it straight off some blinkenlights.
> It's much easier to tell if you have a stuck bit
> (data or address) with simple LEDs.  This was (and is)
> a real possibility in old machines.  Trying to watch
> for patterns of HEX or OCT digits to provide the same
> info would be really tough.

By the way, that's why most front panel implementations have
a "light check" function.

Bill S.

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