Cyber ECL Wiring
cclist at sydex.com
Fri Nov 28 00:59:20 CST 2014
On 11/27/2014 10:35 PM, Billy Pettit wrote:
> You are correct. Eric, have you seen a Cyber 170 chassis? There is
> no back plane. Every signal uses twisted pair wire wrap from module
> to module. It was horrible to build, wire mats inches thick. We
> used to allow field engineers 10 minutes per signal line for
> engineering change orders.
> Provided, the line did not need to be tuned. Tuning was done by
> changing wire length. It was not elegant by later standards but was
> very very fast for the era. One of the downsides to using
> differential wiring throughout the system was the manufacturing time
> measured in months. Of course, they sold for millions or tens of
> millions of dollars so it was worth this approach.
It didn't start with the 170, did it Billy? I remember a nice thick mat
of twisted-pair wires on the backplanes of 6000s, as well as in a lot of
attached controllers. Taper pin technology.
A co-worker of mine had, as his first job fresh from UofM, measuring all
of the loops to which Seymour had attached tags that said "Tune".
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