> >The PC boards that make up the backprojector make use of a unique
> >technology: the PC boards themselves are just plain old two-layer boards,
> >with the actual PC traces carrying only power and ground. All the actual
> >wiring is done by fine machine-laid wiring between pads, with all
> >the wire layers "potted" in a plastic compound. Obviously, reworking
> >such a PC board is extremely difficult, but it gives impressive component
> >densities for the time. The modern equivalent of this is multi-layer
> >PC boards, naturally.
> -Dave McGuire
The multiwire was quite nice and cheap in it's day. ECO's were often
done by drilling down a few layers.
The old Concurrent Computer/Perkin Elmer/Interdata 7/32, 8/32 and 3200
series used them heavily until multilayer boards got cheaper to do.
Bill
---
bpechter_at_shell.monmouth.com|pechter_at_pechter.dyndns.org
Three things never anger: First, the one who runs your DEC,
The one who does Field Service and the one who signs your check.
Received on Mon Oct 04 1999 - 20:59:44 BST