24 Jan
2012
24 Jan
'12
8:34 p.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] On Behalf Of Brian L. Stuart
Sent: 24 January 2012 17:05
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Identify: IBM memory
http://gizmodo.com/5878645/this-giant-chunk-of-metal-is-4-kilobytes-of
No one ever said it was "main memory", just memory. I agree it looks like
Williams Tube memory and pictures of the 701 here:-
http://www-03.ibm.com/ibm/history/exhibits/701/701_1415bx01.html
show them as pairs of tubes, but the adjustment manual
http://ed-thelen.org/comp-hist/IBM706-WilliamsTubeMemory-RandyNeff.pdf
seems to show more tubes and caps than the picture above...
-memory
? ? ? ? ? ? ? ?
But what type of memory is it? Delay line, CRT tube,
Drum?
? ? ?
Bonuspoints if the machine can be identified :)
My guess would be CRT memory from the 701.
It looks too short to me to be mercury delay line, especially
for 4k, and it definitely doesn't look like a drum. Plus, I
don't recall IBM ever using delay line for main memory.
BLS