24 Feb
2011
24 Feb
'11
9:37 a.m.
I recently acquired:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320652132954&ssP…
but I don't know enough about 70s minis to recognize which
sort of system it came from...
- John
24 Feb
24 Feb
10:25 a.m.
On 2011 Feb 24, at 9:37 AM, John Foust wrote:
I recently acquired:
http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&item=320652132954&ssPageName=ADME:L:OU:US:1123
but I don't know enough about 70s minis to recognize which
sort of system it came from...
Looks like there are 12 bit-arrays, perhaps it was for a PDP-8.
10:40 a.m.
At 12:25 PM 2/24/2011, Brent Hilpert wrote:
Looks like there are 12 bit-arrays, perhaps it was for
a PDP-8.
Does a PDP-8 edge connector look like that? Blue metal?
It looks like this is two boards of what was a three-board sandwich.
The top one probably went to the melt, judging by the seller's ID.
- John
11:57 a.m.
>>>>
I recently acquired:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320652132954&ssP…
DME:L:OU:US:1123
but I don't know enough about 70s minis to recognize which
sort of system it came from...
<<<<<
Interesting. 16-bit planes (no parity). Yet by mid 1976 (from date on driver
chips) most minis would be using semiconductor memory - reliable versions of
dynamic RAM had been out for 5 years.
I'd think military or other high reliability, but then where is the parity?
Andy
6:21 p.m.
At 01:57 PM 2/24/2011, Andy Holt wrote:
Interesting. 16-bit planes (no parity). Yet by mid 1976
(from date on driver
chips) most minis would be using semiconductor memory - reliable versions of
dynamic RAM had been out for 5 years.
I'd think military or other high reliability, but then where is the parity?
Seller tells me it came from a "Lockheed or Raytheon - scrap back room".
- John
12:24 p.m.
And another strange core memory board......
Ebay 180628933361
I suspect that it is some sort of rom, but if anyone has a better explanation I would be
interested.
Jos
7:06 p.m.
I suspect that it is some sort of rom, but if anyone
has a better
explanation I would be interested.
It's marked as containing microcode. The seller describes "specially
wound ceramic rods", so I'd guess it's conceptually similar to rope
memory. Looks like this is one of at least two such units to make a
full word, as the bit planes are numbered 16-31. Other markings on the
cards suggest it's from a Siemens System 4004. Teh internetz say a
4004 is a rebadged Spectra 70 (IBM 360 clone) they bought from RCA.
De
25 Feb
25 Feb
1:38 a.m.
On Thu, 24 Feb 2011, Dennis Boone wrote:
No, he doesn't say that.
I suspect that
it is some sort of rom, but if anyone has a better
explanation I would be interested.
It's marked as containing microcode. The seller describes "specially
wound ceramic rods", so I'd guess it's conceptually similar to rope memory. Looks like this is one of at least two such
units to make a
full word, as the bit planes are numbered 16-31. Other markings on the
cards suggest it's from a Siemens System 4004. Teh internetz say a
4004 is a rebadged Spectra 70 (IBM 360 clone) they bought from RCA.
What are you talking about?!?
The page sais "Ampex Copper Core Memory Board 1976" and there are no
numbered planes, no markings from Siemens or the like, and it is clearly
not a rom containing microcode, it's just a plain "standard" memory board.
(Remember, this discussion is about Epay no. 320652132954)
Christian
6:43 a.m.
On Friday, February 25, 2011, Christian Corti wrote:
The message he replied to:
On Thursday, February 24, 2011, Jos Dreesen wrote:
memory. Looks
like this is one of at least two such units to make
a full word, as the bit planes are numbered 16-31. Other markings
on the cards suggest it's from a Siemens System 4004. Teh
internetz say a 4004 is a rebadged Spectra 70 (IBM 360 clone) they
bought from RCA.
What are you talking about?!? And another strange core memory board......
Ebay 180628933361
I suspect that it is some sort of rom, but if anyone has a better
explanation I would be interested.
Jos
Perhaps you should get a mail client that does threading correctly? :)
Pat
--
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
7:04 a.m.
Patrick Finnegan wrote:
Hmm, Thunderbird doesn't know how to handle it (and I consistently see that
with Chuck's messages on this list, too, which TB always displays as though
they were a reply to the first message in a thread, just like Dennis' one did
for me here).
There was enough unsnipped message to know who was replying to what, but TB
frustrates the heck out of me when it does it.
Anyway, Thunderbird rant over... :-)
What are you
talking about?!?
The message he replied to:
On Thursday, February 24, 2011, Jos Dreesen wrote:
And another strange core memory board......
Ebay 180628933361
Perhaps you should get a mail client that does threading correctly? :)
26 Feb
26 Feb
1:39 a.m.
On Fri, 25 Feb 2011, Patrick Finnegan wrote:
On Friday, February 25, 2011, Christian Corti wrote:
Well, this line above was missing, so I couldn't see who wrote what...
Perhaps people should learn to quote correctly? ;-)
What are you talking about?!?
The message
he replied to:
On Thursday, February 24, 2011, Jos Dreesen wrote: Perhaps you should get a mail client that does
threading correctly? :)
I'm using Pine and Alpine; do you know any other good text-mode email
clients (apart from Mutt which I don't like)?
If OTOH classiccmp was a usenet group instead of a mailing list, there
would be no such problems.
Christian
25 Feb
25 Feb
6:43 a.m.
At 03:38 AM 2/25/2011, Christian Corti wrote:
What are you talking about?!?
The page sais "Ampex Copper Core Memory Board 1976" and there are no numbered
planes, no markings from Siemens or the like, and it is clearly not a rom containing
microcode, it's just a plain "standard" memory board.
(Remember, this discussion is about Epay no. 320652132954)
No, someone thread-hijacked before I saw a definitive answer:
At 02:24 PM 2/24/2011, Jos Dreesen wrote:
And another strange core memory board......
Ebay 180628933361
I'm not sure why I haven't had an answer yet. I've made a blood sacrifice.
Those prongs are sharp. I thought it would work like SCSI troubles.
- John
4831
days inactive
4833
days old
11 comments
8 participants
participants (8)
-
andyh＠andyh-rayleigh.freeserve.co.uk -
cc＠informatik.uni-stuttgart.de -
drb＠msu.edu -
hilpert＠cs.ubc.ca -
jdr_use＠bluewin.ch -
jfoust＠threedee.com -
jules.richardson99＠gmail.com -
pat＠computer-refuge.org