IBM 1620

[Dave G4UGM]

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Paul
> Koning
> Sent: 30 August 2015 13:20
> To: General Discussion: On-Topic and Off-Topic Posts
> <cctalk at classiccmp.org>
> Subject: Re: IBM 1620
> 
> 
> > On Aug 30, 2015, at 4:49 AM, Dave G4UGM <dave.g4ugm at gmail.com>
> wrote:
> >
> > ...
> >> IBM had special machines to
> >> position and thread them.
> >> http://ibm-1401.info/IBMCoreArraysIEEEMagnetics1969.pdf
> 
> 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...