PCB vs wirewrap, was Re: SBC6120 (a build-it-yourself PDP-8 clone) grammer checked

jim stephens jwstephens at msm.umr.edu
Tue Jun 6 16:24:54 CDT 2006

Don North wrote:

> Brent Hilpert wrote:
> <snip>
> Multiwire was the trade name from one vendor I am familiar with. It 
> was used to do the prototype for
> the first pass of the DEC 11/74 commercial instruction set CIS 
> processor. It was a disaster.
We used multiwire twice for our test boards, 8" x 11" which were usually 
4 layer
boards, with mostly 14 or 16 pin dips.

We had good luck with multiwire, and it was able to run off our wirewrap
system, since there was less to be concerned with as far as routing.

It was only faster to use an early form of computer circuit board routing
and a pcboard, but probably 10 times as expensive.

The boards had good electrical characteristics, which was a concern
with us, since we were doing a Microdata 1600 type processor plug

I did see some other boards that had the hole to wire problem, but those
were on much larger boards, for DG Nova type systems and had much
more wiring on it than our cpu's did.

Don, thanks for recharging my brain cells about what this was called

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