On Sat, 27 Nov 2021 21:28:44 -0600, Louis Ohland <ohl...@charter.net
>My SWAG is the automated assembly line they used needed the reduced
>degrees of freedom of the planar edge connector?
I saw 1 answer that might have been on point by 2 guys
Back in the old days Reliability, Availability and Serviceability
were the key tenants of the field service divisions. We had a career
path for Service Planning Reps who fought for these attributes daily
with manufacturing, engineering, marketing and others.
Using an edge connector instead of discrete wiring would have been the
type of thing that might have arisen from whoever did his sort of
agree serviceability was key and a single FRU you could plug in
without making a mistake. IBM dealers had to ramp up staff quickly and
Inexperienced Field techs would go out of there way to plug a cable in
backwards even when they are keyed or forget to connect a cable. PS/2
were idiot proof, disassemble quickly (they were tool less using thumb
screws and clips as long as you could find the keys) and replace the
appropriate module. It was hard to make a mistake or forget to plug
Most of them were just the old N.I.H thing at Boca. They started that
design on a clean sheet of paper and didn't use much of anything the
other machines used.
It was sort of like why the 55s and similar used the Dallas clock.