Re: Found some Core Memory
> I would expect anything from IBM to say I B M on it somewhere.The core I salvaged from the IBM 1620 and IBM 1130
were merely green frames that stacked together.
No "IBM" anywhere.
Even back then, IBM outsourced SOME things.
The IBM system 1130's plotter is from Calcomp
and the paper tape reader from Tally.
The semiconductor RAM on the IBM system 38 is from EMM.
> In those days, IBM made everything themselves,I wish I could find photos from the IBM Kingston facility's
Historical Society. It showed a HUGE foot-locker sized
core memory module for the IBM 360,
with photos of all the steps of manufacturing, weaving
and even re-weaving to replace a failed core!
- On 6/5/11 6:46 AM, Jeff Jonas wrote:
>>> I don't advise trying to buildCore runs hot, sure, but this is well understood and easily handled.
>>> analog core memory read/write electronics ...
>> Hey, it's finicky and fiddly, but it can be done (and has been),
>> and there are many design examples out there.
> But can they handle the temperate range as things heat up,
> and the density of the one being considered?
If Dan has trouble getting that core plane running, it won't be
because it runs too hot.
> The Arduino core project I saw recentlyThe sparseness of that design surely had little to do with heat.
> is only 8 x 8 and very sparsely populated.
> Yes, today's DSPs can do thingsNah. Core is pretty reliable when you get a design running. Getting
> that required dedicated hardware not long ago,
> but the algorithms and reliability looks tricky.
> If that's handled properly, I'd love to see the new ways!
it to that point takes work, though. Most, if not all core systems have
a thermistor near a core plane to adjust X/Y drive currents...I suppose
one *could* do that with a DSP, but you'd be replacing a simple,
easily-modeled circuit with maybe half a dozen transistors and a handful
of resistors with a very complex chip and hundreds, if not thousands of
lines of code.
Port Charlotte, FL