At 03:15 PM 1/18/2012, Steven Creswick wrote:
>Drew - Richard,
>
>I was going to add that many people have not even seen a core memory
>card, let alone touched one.

I got the Fleet just in time to see our airborne mission computer
upgraded to a whopping 108K of core memory.  It took a licking and
kept on ticking (cat, trap, cat, trap ad infinitum) and restored
reliably (that non-volatile thing) when pwr glitched or was
interrrupted.  Now, the mag tape unit -- that was another story. The
cork lined brake band on the drive motor wasn't good for long at all.

>Steve C
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Drew meyer
>Sent: Wednesday, January 18, 2012 10:52 AM
>To: [log in to unmask]
>Subject: Re: [TN] What is the future of electronics assembly?
>
>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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