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From: nessus@nsc.UUCP (Kchula-Rrit)
Newsgroups: net.micro
Subject: Re: How to fab One-Of-A-Kind Systems
Message-ID: <2752@nsc.UUCP>
Date: Fri, 24-May-85 12:14:36 EDT
Article-I.D.: nsc.2752
Posted: Fri May 24 12:14:36 1985
Date-Received: Sat, 25-May-85 09:41:34 EDT
References: <10903@brl-tgr.ARPA>
Organization: The Patriarchy of Kzin, Kzin
Lines: 26

> 
> With my own two little hands I wirewrapped a Garry ECL wire-wrap board that
> ran just fine at 45.5 Mhz after a little tweaking.  The tweaking consisted of
> putting in flip flops to catch signals that wouldn't propagate through three
> chips in less than 22 nanoseconds.  In any case, Augat sez that you can hit
> 100 Mhz with ECL wirewrap, and I think I'll check that out this summer.
>   I was amazed the first time I looked at rise and fall times on ECL with
> a scope.  The edges are NOTICEABLY less sharp after TWO inches of wire.
> I guess that God just doesn't like higher harmonics in 50 Mhz square waves.
> 
> John McCluskey @JPL-VLSI.ARPA
> ------

*** REPLACE THIS LINE WITH YOUR MESSAGE ***

     Having worked with ECL(wire-wrapped, no less!) in the past, I must agree
with John.  What's even more interesting is when you leave the terminator
resistors out-- your neat pulses turn into swooping curves almost like pieces
of sine waves!  It was one of the more interesting types of things I have
worked on.

     Ahh, ECL, one of the few arcane arts they haven't (yet) burned people
for practicing.  I think the other is analog...

			From the alter ego of--
			Kchula-Rrit