360/50 microcode listing

Jon Elson elson at pico-systems.com
Thu May 7 21:07:10 CDT 2015

On 05/07/2015 01:56 PM, Robert Ferguson wrote:
> Is there a reliable estimate of the number of extant relatively complete and/or actually working System/360 machines? A registry, perhaps?
> I would find that to be a very interesting data point.
> - Rob
This is certainly not authoritative, but the best I've found 
so far :


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