IBM 1620

Paul Koning paulkoning at
Sun Aug 30 14:15:09 CDT 2015

> On Aug 30, 2015, at 2:34 PM, Chuck Guzis <cclist at> wrote:
> ...
> I have heard of machine-fabricated core as well, but I thought that it only applied to larger, slower bulk core store.  One can certainly understand why plated-wire or thin-film technologies were attractive.

Perhaps CDC's ECS?  125k (funny number that) words per memory bank.

> Sigh.  Another lost manual art.  I can remember during the 70s that the hot thing was to learn IC layout--the wives of a number of co-workers were going to night courses for that.

I've never done that, though I have Carver Mead's textbook that describes how it is done.  I did do a PC board layout with red and blue tape on a light table, in 1977.


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