IBM 1620

Paul Koning paulkoning at
Sun Aug 30 12:18:30 CDT 2015

> On Aug 30, 2015, at 9:28 AM, Dave G4UGM <dave.g4ugm at> wrote:
>> ...
>> Interesting.  I remember learning about the processes DEC used.  No fancy
>> machines, just a flat plate jig with slots to hold the cores in their
> correct
>> position, and nimble-fingered Oriental ladies to thread the wire through
> the
>> core planes by hand.  Seemed sensible to me; that is the process I was
>> thinking about for this case.
>> 	paul
> Surely DEC used machine threaded cores later on. There is a 16k (I think)
> DEC board in the Museum of Science and Industry in Manchester that must be
> machine woven as you can't see the individual cores without heavy
> magnification...

Perhaps.  But I never heard of core threading machines until today.  Just because you can't see the cores without magnifiers doesn't mean this couldn't be done by hand.  It's amazing what trained hands can do. 


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