8/S Replica

Vincent Slyngstad v.slyngstad at verizon.net
Thu Feb 28 11:19:54 CST 2008

From: "jim s":
> I have access to a couple of Standard wire wrap machines, and the lady 
> who used to run it, if anyone can get an idea how to do the boards, and 
> get the paper tapes.  I wonder if it is worth the effort of wirewrap, 
> since the connectors don't have wirewrap tails?

If you've got access to an automated wrap machine, it seems more plausible 
to just use that to wire up some full sized backplanes, DEC style :-).
It should be no problem to massage the wire list into whatever format 
the wrap machine needs.

Then you could use full size flip-chips, through hole parts, and make 
the whole thing that much more authentic.

> It's been a while since I looked at what goes on with the DEC backplanes 
> and wirewrap.  Do they populate pins regardless of the connectors having 
> wirewrap tails, or are the pins mostly from the connectors?

The DEC connector blocks have sockets arranged in a 4x2 grid, and the 
sockets each have 36 wire-wrap pins/tails.  Those are soldered to the 
PCB in some of the later gear, or just wire-wrapped in the older gear.
There was also a metal strip with holes in it that alternated little 
hole, big hole, that was soldered to every other pin in a row for 
power bussing.  (The small holes got soldered to the pin, the big 
ones left a gap around the pin from the other side of the edge connector.

If you get into the really old gear, there were fewer wire-wrap pins, 
and heavier guage wire was used for the wraps.  Hopefully we can ignore 
that stuff, as none of the tooling or connectors are readily available.


(BTW, I still don't seem to be able to mail to the list from the address 
I'm getting list mail from.)

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