Following on from my previous post re punched cards, thank you for replying.
I am following up where I can.
Now, however, I realize that the IBM Port-A-Punch requires a special type of
cards. Does anyone have 1 to 3 of these they can spare. (I already have the
instrument.)
Many thanks,
peter
||
At least in radio repair of old equipment old electrolytic caps
cause all sorts of issues. Most of the guys doing restoration do a total
remove/replace on them. In my opinion,,, I think that's a little
extreme,,, but then having one fail after all the other work is done is
also a PITA.
Hi Emanuel,
I remember them well, I was their manufacturer's rep in Houston, and sold
several to petrochem, NASA and universities.
It was a big ticket item, selling for upwards of 40K when loaded up with all
the options.
NASA was using it for animation, the petrochem guys for geology visualiza
Emanuel Stiebler wrote:
> was just fishing in old memories & graphics systems. We had in the
> 1980's a big fridge from Grinnell Systems as a frame buffer on a 11/34.
> Anybody remember those? Links to any documentation?
MIT Plama Fusion had one, made by John Kulp. It was connected to MIT-MC
and
So whatever the fault is (perhaps the QBUS block transfer issue reported
up-thread), it must _seem_ to work, but fail in actuality. It would be
interesting to appply a logic analyzer, and see what the bus transaction
looks like, if it looks OK on the bus (in which case it's an internal
failure).
On 04/22/2020 02:27 PM, emanuel stiebler via cctalk wrote:
Hi all,
was just fishing in old memories & graphics systems. We had in the
1980's a big fridge from Grinnell Systems as a frame buffer on a 11/34.
Anybody remember those? Links to any documentation?
Yes, the Earth and Planetary Science g
Back in 2013, Bob Rosenbloom asked:
> I have an HP 9872 plotter that just died. According to the internal self
> test (very nice!)
> one of the bib (MOS to TTL) drivers has failed.
Tony Duell wrote:
> the devie is very simple (it's simialr to the 74LS245) but the problem is
that one side of it doe
On 2020-04-22 6:19 PM, Rob Jarratt via cctalk wrote:
> I am on a mission to fix a bunch of power supplies and now I am looking at
> my MicroVAX 3100/95. A few days ago I mentioned that the big smoothing
> capacitors on the primary side might need replacing. I have done that now.
>
>
>
> However
I am on a mission to fix a bunch of power supplies and now I am looking at
my MicroVAX 3100/95. A few days ago I mentioned that the big smoothing
capacitors on the primary side might need replacing. I have done that now.
However, in doing so, I have discovered that *one* of the capacitors does
Greetings
I went looking for a specific version of C-Kermit to reconstruct sources
for an old system (The Boston Software Works Venix for Rainbow that I
have). I didn't find the 4C(052) I was looking for, but did find many
previous 'presumed lost' versions.
https://bsdimp.blogspot.com/2020/04/fin
Hi all,
was just fishing in old memories & graphics systems. We had in the
1980's a big fridge from Grinnell Systems as a frame buffer on a 11/34.
Anybody remember those? Links to any documentation?
Cheers!
On 4/22/20 12:52 PM, ED SHARPE via cctalk wrote:
> We have a UNIVAC 422 compute at smecc..looking for the Remington
> typewriter unit with a removable punch and reader on it.
> The typer is like a flexowriter but newer and sleeker...although we have
> seen a 422 with the flexowriter like
On Wed, Apr 22, 2020 at 11:57 AM Nigel Johnson via cctalk <
cctalk@classiccmp.org> wrote:
> Thanks for the link. I am sure I am going to come down and see your
> site when this crisis is over!
>
> I was an FE on three Univac 418 IIs at Bell Canada in Toronto between
> 1971 and 1975.
>
> Don't sup
We have a UNIVAC 422 compute at smecc..looking for the Remington typewriter
unit with a removable punch and reader on it.
The typer is like a flexowriter but newer and sleeker...although we have
seen a 422 with the flexowriter like the UDT had on it.
Have some programming that is u
Sorry, no 418, just the 490, and the 1218.
Bob Roswell
brosw...@syssrc.com
410-771-5544 ext 4336
Computer Museum Highlights
-Original Message-
From: cctalk On Behalf Of Nigel Johnson via cctalk
Sent: Wednesday, April 22, 2020 11:58 AM
To: Bill Degnan via cctalk
Subject: [EXTERNAL] Re:
> From: Mark Matlock
> Are you able to use a Qbus MTI controller in the 11/84's Qbus section
> of the backplane? This is something I've often wondered about but never
> tried.
I looked into this in some detail, but I don't know:
https://gunkies.org/wiki/KTJ11-B_UNIBUS_adapter#Q
Thanks for the link. I am sure I am going to come down and see your
site when this crisis is over!
I was an FE on three Univac 418 IIs at Bell Canada in Toronto between
1971 and 1975.
Don't suppose you have any 418s there?
cheers,
Nigel
On 22/04/2020 08:52, Bill Degnan via cctalk wrote:
On 04/21/2020 10:09 PM, Brent Hilpert via cctalk wrote:
On 2020-Apr-21, at 5:27 PM, Chris Zach via cctalk wrote:
Meantime reading the manual I found an interesting test: If you short emitter
to base on Q4 (easiest way is to jumper diode D10) the voltage on the -12v
supply goes to .4 volts. The
> From: Chris Zach
> in place of my quad height 11/73 CPU with 2mb memory.
Sorry, which exact quad-height CPU card?
{As someone else has previously pointed out, the /73 and the /83 are basially
the same machine (roughly the same CPU board - KDJ11-B, perhaps with different
clock crystals
Also what is the V at Q4.E (should be ~ +2.6V), also Q4.B & C.
Q4.E to ground is 3.05
Q4.B to ground is 3.24
Q4.C to ground is -9.18
When Q4.BE shorted, E2.6 should swing well-negative.
Nope, 2.544 on E2.6 assuming E2's pinout is
1 8
2 7
3 6
4 5
C
Favor to ask: Would anyone have MPW running in some environment, such that
if I give them a PEF file they could run dumppef on it and get the symbol
table exports and such? The format is documented and I can write python to
pull out what I need, but would be so much quicker if someone had MPW
insta
A true treasure and worth the trip to System Source to see in person.
First class stuff there! (When it reopens, ug)
On Tue, Apr 21, 2020, 7:16 PM rar via cctalk wrote:
> The System Source Computer Museum is closed due to COVID-19, so we are
> making some video gallery talks.
>
> Here is the fi
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