IBM 1620; was: Early Programming Books

Chuck Guzis cclist at
Mon Jun 21 13:43:10 CDT 2021

On 6/21/21 10:55 AM, Paul Koning via cctalk wrote:
memory. Nobody explained why that was a real problem.
> Core memory is fairly sensitive to temperature.  In the case of the 1620, there is a heating system that brings the core memory box up to its operating temperature, which is why it takes several minutes after you turn on power before the machine will run.
> Possibly the fan problem meant the temperature control system was no longer adequate.

For some (jprobably hallucinatory) reason, I thought there was a project
at CHM to replace the 1620 core stack with semiconductor memory.   Guess
that never happened.


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