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Re: gEDA-user: bypass caps

On Aug 21, 2006, at 12:19 PM, Stuart Brorson wrote: 
I believe that back in the 70s DEC used to use two layer boards with
PWR and GND run on busses layed out on a rectilinear grid.  Signal
traces were on top (IIRC) and PWR/GND on teh bottom.  The DIPs
were layed out in rectangular rows following teh same grid.  Fingers
would extend from the PWR and GND busses to each DIP to feed
its power/ground pins.

This is true of *some* DEC boards but definitely not all. I see it on about 1/3 of them. That scheme didn't seem to last long before they went to multilayer boards with embedded power/ground layers. (I have ~200 qbus, unibus, and omnibus boards here; I hack on 'em all the time)

            -Dave

--
Dave McGuire
Cape Coral, FL



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