Re: core memory, Historical evolution of CPU perf

According to BGB  <cr88192@gmail.com>:

We used the 11/20 as a remote debug device for the 8085 cash
register machine(s) we were building.

 
Core memory: slow to access but also slow to forget.

>
Core memory was before my time, but I remember reading somewhere that it
needed to be preheated to a certain operating temperature in order to
write to it (because the hysteresis energy of the ferrite rings was
temperature dependent, and it needed too much power to flip the bits at
lower temperatures).

The memory for the IBM 7090 in the late 1950s was in a heated oil bath
but they soon figured out how to make core work at room temperature.
On the PDP-8 and PDP-11's that I used, the core was in the box with
everything else with no special temperature controls.

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