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

Brent Hilpert hilpert at cs.ubc.ca
Tue Jun 6 03:05:22 CDT 2006

There was another technique for making circuit boards in the 70s: a
programmed/automated machine moved over the initially bare board and laid down
a fine wire from a spool to form the circuits. I think the wire stuck to the
board initially and the board was later lacquered or coated with something to
seal/hold the wires better. I forgot how the wire traces were terminated
around IC pin locations, probably a pressure weld.

I think the economics were such that it was too slow for large production
runs, but was suitable for prototypes and small production runs of larger,
more-complex boards. Last example I saw was a disk-controller for a TI-990
mini circa 1980.

Anybody remember the name for the technique?

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