I was looking thru one of the yearbooks from my time at University of
Missouri, Rolla. I found what I think is a photo of a GE-200. I
"liberated" this system or one of them to a lab I had, when they were
mothballed, and I could swear that is what the systems were.
If anyone recognizes them, let me know. This is the first hint of any
sort as to what I had. And my memory could be wrong. The square
indicator and switch style is very much like what I recall for this
particular system.
I had gotten handed a couple of very heavy trays of Lambda power
supplies which clearly were for some purpose due to how they were
mounted. I later found the system I think was a GE-200 neglected in a
stockroom in the EE building and recognized that the interconnnect would
fit the power supply trays I had.
The system was transistorized, not IC I might add. That was why it took
4 or 5 large Lambda supplies. Luckily we had not broken the supply tray
up and i was able to play with it.
The other thing i think might be of interest are several photos of an
analog computer that the EE dept had. I know there was another much
larger system in the Physics department as well, and maybe I'll luck out
and find a photo of it later.
Oh, and the blond at the keypunch. I might add that she is probably
retired now.
thanks
Jim
http://s1101.photobucket.com/user/jws1971/library/UMR%20computer%20photos
"Fan belts only exist, briefly, in the intervals between stars
Reviewing the informative Turing?s Cathedral
Programming the ENIAC, the world's first digital computer (US Army photo)
Book review
It's a full four years since it was published, but Reg contributor
Geoffrey G Rochat has finally gotten around to reading George Dyson's
worthy tome Turing?s Cathedral. He finds it's not just a Best Book
list lurker, but something actually worth reading."
http://www.theregister.co.uk/2016/01/10/turing_cathedral_fan_belts_exist_br…
Contains some discussion of level-based versus pulse-based logic in
early valve computers which is frankly way over my head but might be
of interest to some here.
--
Liam Proven ? Profile: http://lproven.livejournal.com/profile
Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven
MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven
Cell/Mobiles: +44 7939-087884 (UK) ? +420 702 829 053 (?R)
Some time ago I acquired a HP 3000/37 micro, it has a faulty psu.
One of the mosfet controlling the power transistor BUX48 was shorted an blew
up the whole power stage.
Getting new fet's and power transistor wasn't the problem, but the regulator
IC also has blown.
The regulator IC is marked CC3896F made by SB and also has this number
'3713045', the only info I can find on the net is provided by the known IC
brokers from China.
I'd like to get this box running again, so I'm looking for the IC or a
replacement PSU which is an ITT PEC 3945 P/N 6064265.
Any other info about it like diagrams and datasheets about the CC3896F are
also welcome.
Thanks,
-Rik
Not the GE 200 I am used to! what did it have for a console?
Ed# _www.smecc.org_ (http://www.smecc.org)
In a message dated 9/26/2016 3:21:41 A.M. US Mountain Standard Time,
jwsmail at jwsss.com writes:
I was looking thru one of the yearbooks from my time at University of
Missouri, Rolla. I found what I think is a photo of a GE-200. I
"liberated" this system or one of them to a lab I had, when they were
mothballed, and I could swear that is what the systems were.
If anyone recognizes them, let me know. This is the first hint of any
sort as to what I had. And my memory could be wrong. The square
indicator and switch style is very much like what I recall for this
particular system.
I had gotten handed a couple of very heavy trays of Lambda power
supplies which clearly were for some purpose due to how they were
mounted. I later found the system I think was a GE-200 neglected in a
stockroom in the EE building and recognized that the interconnnect would
fit the power supply trays I had.
The system was transistorized, not IC I might add. That was why it took
4 or 5 large Lambda supplies. Luckily we had not broken the supply tray
up and i was able to play with it.
The other thing i think might be of interest are several photos of an
analog computer that the EE dept had. I know there was another much
larger system in the Physics department as well, and maybe I'll luck out
and find a photo of it later.
Oh, and the blond at the keypunch. I might add that she is probably
retired now.
thanks
Jim
http://s1101.photobucket.com/user/jws1971/library/UMR%20computer%20photos
You might try looking at the M9312 proms that Don North has made available here:
http://www.ak6dn.com/PDP-11/M9312/
If you have an M9312 in your system it will have the basic console prom in it.
There are listings of the prom contents on that web page.
There is also a simple diagnostic prom that loops forever near the bottom of the page.
If you don't have an M9312 then you could probably key in a program from the rom listings provided.
I'd bet Don will be along shortly to provide a better explanation.
the only difference might be the keycaps and ROMs! let me know!
Ed#
In a message dated 9/25/2016 9:35:27 P.M. US Mountain Standard Time,
davidkcollins2 at gmail.com writes:
Apart from the different colors I'd be surprised if all the tubes weren't
interchangable between the 700 series. I think the only difference between
models is the logic PCA and ROMs etc. The 700 series service manual
would confirm one way or the other.
David Collins
(Sent from out of office)
> On 26 Sep. 2016, at 3:08 am, Al Kossow <aek at bitsavers.org> wrote:
>
> I picked up a 700/60, the ANSI version of the HP 700-series terminal and
when I took it
> apart to clean, it had a VDC 1401DP31BE inside. I swapped the CRT into a
700/92 which
> has a slightly different board, and a burned in amber tube, and it
worked fine.
> Also I noticed the 700/96 PCB is almost identical to the 700/60, so I'll
try a
> rom swap to see what happens.
>
> Too bad there aren't generally available cross reference list for
terminal CRTs.
> FWIW, the 700/96 has a Philips M32ECD3G CRT.
>
> VDC is having a "sale" on the 1401DP4 and P31. The tube price is pretty
cheap but the
> shipping is about double when you price it against their normal $55
price. The shipping
> goes down with quantity, so if you buy 5 or so it ends up being about
$25 a tube and
> significantly cheaper than all of the ones listed on eBay.
>
>
>
Hi all --
I have myself a Bunker Ramo BR2412 12-bit minicomputer. This is similar
(but not identical) to the Nuclear Data ND812. There are schematics /
maintenance manuals for the ND812 on Bitsavers which have been immensely
helpful. The main difference between the BR2412 and the ND812 is that
the BR2412 uses Intel 1103 RAMs (backed up by a big lead-acid battery)
rather than core memory. (There are other more subtle differences, the
ND812 used incandescent bulbs on the front panel, the BR2412 has LEDs).
I've been working on restoring this thing (which has been an interesting
challenge -- there are 325 wire-wrap sockets with dodgy connections with
the ICs to deal with) and I've been making steady progress, but I've
finally reached a point in my debugging where the schematics differ from
reality, as I get closer to the memory interface. I can likely work
things out by hand, but having a real set of documents would obviously
be helpful.
I realize this is a long shot since it's a pretty obscure machine, but I
thought I'd ask before I dive in too deep here. Oh, and while I'm asking
for impossible things, if anyone has any *parts* for one of these, let
me know -- I'm missing the TTY interface...
Thanks!
Josh
sounds like a good reason to have a rom cloning party too! Ed#
_www.smecc.org_ (http://www.smecc.org)
In a message dated 9/25/2016 6:08:39 P.M. US Mountain Standard Time,
aek at bitsavers.org writes:
I picked up a 700/60, the ANSI version of the HP 700-series terminal and
when I took it
apart to clean, it had a VDC 1401DP31BE inside. I swapped the CRT into a
700/92 which
has a slightly different board, and a burned in amber tube, and it worked
fine.
Also I noticed the 700/96 PCB is almost identical to the 700/60, so I'll
try a
rom swap to see what happens.
Too bad there aren't generally available cross reference list for terminal
CRTs.
FWIW, the 700/96 has a Philips M32ECD3G CRT.
VDC is having a "sale" on the 1401DP4 and P31. The tube price is pretty
cheap but the
shipping is about double when you price it against their normal $55 price.
The shipping
goes down with quantity, so if you buy 5 or so it ends up being about $25
a tube and
significantly cheaper than all of the ones listed on eBay.
> If your CPU is an 11/73 (which can directly 'access' [hate that verbism
> :-] all of memory from ODT, unlike the 11/23 which is restricted to the
> bottom 256KB), try playing around with a failing location, and its
> alternative, directly, and see if a store of random data into one can be
> read back directly from the other
Note: The 11/'73' CPU powers up with the cache enabled, even for ODT!
So if you write xxx into some location, if you then read it back, you will get
the correct data even if the memory location is busted - the CPU is getting
the (correct) data from the cache. To have your 'memory' reads and writes
actually go to the memory, you need to turn off the cache:
17777746/ 02000
Note that starting the machine does an INIT, which will again enable the
cache.
> I'll start the Computer History wiki page for this board with that info.
Started:
http://gunkies.org/w/index.php?title=CMV-4000
Currently has only the memory chip info, I'll add the config stuff as I get it
doped out.
Noel
Does anyone know of documentation for the HP9895A format with its own M2FM encoding?
I have a kryoflux preservation stream but so far can make no sense of it.
Denise
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