Captain Obvious here. Those edge card power terminals are wasteful, you
need to snap them over both sides, and those sides MUST be for the same >signal / voltage...
Pin / sockets are denser.
On Sat, 27 Nov 2021 15:40:58 -0600, Louis Ohland <ohland@charter.net>
wrote:
Captain Obvious here. Those edge card power terminals are wasteful, you
need to snap them over both sides, and those sides MUST be for the same
signal / voltage...
Pin / sockets are denser.
I never figured out why they used that method to connect the 50/70 PS.
I know those machines were developed in a different plant and I assume
they didn't want to duplicate anyone else's design. It does make a
more compact design and I think that was a big part of it. They wanted
to get away from that "tower" thing.
I always liked the 70. The 50 and 60 never made much sense to me tho.
It was basically just a microchannel PC/AT with all the limitations of
both.
My SWAG is the automated assembly line they used needed the reduced
degrees of freedom of the planar edge connector?
On 11/27/2021 19:03, gfretwell@aol.com wrote:
On Sat, 27 Nov 2021 15:40:58 -0600, Louis Ohland <ohland@charter.net>
wrote:
Captain Obvious here. Those edge card power terminals are wasteful, you
need to snap them over both sides, and those sides MUST be for the same
signal / voltage...
Pin / sockets are denser.
I never figured out why they used that method to connect the 50/70 PS.
I know those machines were developed in a different plant and I assume
they didn't want to duplicate anyone else's design. It does make a
more compact design and I think that was a big part of it. They wanted
to get away from that "tower" thing.
I always liked the 70. The 50 and 60 never made much sense to me tho.
It was basically just a microchannel PC/AT with all the limitations of
both.
My SWAG is the automated assembly line they used needed the reduced
degrees of freedom of the planar edge connector?
On Sat, 27 Nov 2021 21:28:44 -0600, Louis Ohland <ohland@charter.net>
wrote:
My SWAG is the automated assembly line they used needed the reduced
degrees of freedom of the planar edge connector?
The pictures I have seen of the PS/2 assembly areas look more like all
of this stuff was hand assembled on a work bench type operation where
one person built the whole machine from FRUs. I will pop this question
up on the retiree BB and see what the guys who made these things say.
Sounds more like special bid than the normal variants offered in
announcement letters. Still, anything is possumble.
My SWAG is the automated assembly line they used needed the reduced
degrees of freedom of the planar edge connector?
On Sat, 27 Nov 2021 21:28:44 -0600, Louis Ohland <ohland@charter.net>
wrote:
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
G McG
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
thing initially.
·
P F
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
something in.
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.
I must agree, it would be VERY hard to install a 50 / 70 PSU wrong.
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