i believe the shuttle program used core memory avoinics until the '90s --
i know that in the domestic PWB instrustry we used punch-tape in the drill
rooms until almost the year 2000...



From:
Drew meyer <[log in to unmask]>
To:
<[log in to unmask]>
Date:
18/01/2012 10:51 AM
Subject:
Re: [TN] What is the future of electronics assembly?
Sent by:
TechNet <[log in to unmask]>



Dave,

All the responses I read it brought to mind my time at Hawkeye Institute
of Technology earning an electronics technician associate degree.  Keep in
mind this is 1978-1980.

We are learning on training computer systems both programing and
debugging.  One day an older model training computer is set up at the
front of the classroom.  Immediately everyone wants to know why.  We are
informed that we will be learning the function of core memory systems. The
first response of all the students is that's antique (dinosaur) and no one
uses it.  The instructors respond that when we graduate at least 25% or
more of us will be working with it.

Graduation comes and I go to work at a company in Iowa that sells
industrial process control equipment.  Their computers run with core
memory 56k of R/W core and a 2k wire ROM.  Why core/wire based systems?
They are non-volatile memory.  A power failure does not result in data
loss.

 I repair every thing on the core memories but the core stacks.  The wire
ROM, I must repair everything including re-wiring bad wires as the
manufacturer of it will no longer service it.  For the next eight years
the systems are fully serviced and I repair all their cards.  Cards that
include DTL parts.

I believe that older technology dies a little faster today but you can
never count a technology that works well and is still available out of the
mix that will be present in the future.

To this day I can remember core memory function.  Sense/Inhibit lines, X
and Y lines, Data Register to capture the data for output and to re-write
the location.  The read cycle was a destructive cycle (the location was
erased during a read an had to be automatically re-written to restore the
data).

Drew Meyer

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