Am 23.06.2011 16:57, schrieb Invisible:
> http://en.wikipedia.org/wiki/Magnetic_core_memory
>
> Oh. I hadn't realised it was this small. I was thinking that the "cores"
> were the same sort of size as the RF filters you still find on some
> cables. (I.e., about 3cm across.) I had therefore imagined that a
> complete core memory would fill an entire rack. (I also read somewhere
> that it was housed in a vat of heated oil to keep the temperature
> constant, and therefore reduce the need to recalibrate.)
>
>  From the look of this photograph, they actually put the stuff on
> "chips" of a sort...

"Memory modules" is probably closer to the mark. 10x10 cm is not what 
I'd call a "chip". (Though this is a pretty small example; the core 
memory I once had the opportunity to see (and touch) was more like 
20x25, probably with a similar capacity.

My favorite memory type is Core Rope Memory though - a type of ROM used 
in the Apollo Guidance Computer, to be programmed with a sowing needle. 
Bit by bit. Manually, not with an automaton.

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