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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...
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http://en.wikipedia.org/wiki/Percussive_maintenance
Best euphemism ever! :-D
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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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On 6/23/2011 7:57, Invisible wrote:
> 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.
Not really. Draw a circle as small as you can with a fine mechanical pencil,
and you get something the size of a core.
> From the look of this photograph, they actually put the stuff on "chips" of
> a sort...
Boards. That picture is a 10cm x 10cm board. 8K was about as big as you
could hold in one hand, stretching your fingers.
--
Darren New, San Diego CA, USA (PST)
"Coding without comments is like
driving without turn signals."
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On 23/06/2011 3:57 PM, Invisible wrote:
> http://en.wikipedia.org/wiki/Magnetic_core_memory
>
In the day. A 1K of Honeywell 316 memory was about 1.25" wide, 4" deep
and about a foot long. The cores were strung by hand.
--
Regards
Stephen
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On 24/06/2011 02:22 AM, Stephen wrote:
> In the day. A 1K of Honeywell 316 memory was about 1.25" wide, 4" deep
> and about a foot long. The cores were strung by hand.
By unemployed dress makers, apparently.
Also: My dad has a Honeywell central heating system. WTF?
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On 24/06/2011 9:24 AM, Invisible wrote:
> On 24/06/2011 02:22 AM, Stephen wrote:
>
>> In the day. A 1K of Honeywell 316 memory was about 1.25" wide, 4" deep
>> and about a foot long. The cores were strung by hand.
>
> By unemployed dress makers, apparently.
>
> Also: My dad has a Honeywell central heating system. WTF?
Why WTF??
--
Regards
Stephen
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>> Also: My dad has a Honeywell central heating system. WTF?
>
> Why WTF??
That's like... that's like a company that manufactures motorbikes also
manufacturing pianos!
...oh, wait...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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On 25/06/2011 12:56 PM, Orchid XP v8 wrote:
>>> Also: My dad has a Honeywell central heating system. WTF?
>>
>> Why WTF??
>
> That's like... that's like a company that manufactures motorbikes also
> manufacturing pianos!
>
> ....oh, wait...
>
Indeed :-D
--
Regards
Stephen
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On 06/23/2011 10:22 PM, Stephen wrote:
> On 23/06/2011 3:57 PM, Invisible wrote:
>> http://en.wikipedia.org/wiki/Magnetic_core_memory
>>
>
> In the day. A 1K of Honeywell 316 memory was about 1.25" wide, 4" deep
> and about a foot long. The cores were strung by hand.
>
I worked on a piece of avionics gear that was used to identify submarine
acoustic signatures ... it was loaded with mag core memory
LOL now that I'm strolling down memory lane ... there was also a dipping
sonar that had a tray of FULL of capacitors about the size of a soda pop
can ... they were bussed together with aluminum bars. There was an
eyebrow raising admonishment on the case "Warning: 3000V Unlimited
Current" ... working on that would make the hair on my arm stand up from
the field!
Did anyone see the articles about IBM turning 100 ... it was full of
examples about "back in the day" technology?
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