nal-ground, etc. The
neighboring ground wires were much closer together than the
ground-signal spacing. These had a characteristic impedance
of 93 Ohms, I think.
On IBM 370's they split up these cables into individual
signals to reduce crosstalk. They retained the
3-wire/signal scheme, and called them tri-lead.
Jon
to think they were a LOT more reliable than my experiences
watching 360/50 and 360/65 reliability. It might be that
the 1800 had shorter stacks of boards to be cooled in the
same airflow. I know the /65 had a tall stack, and some of
the areas of the CPU had pretty hot air coming out the top.
Jon
On 05/27/2016 11:55 AM, William Donzelli wrote:
I suppose chip level repair might be possible with today's
SOTs, but I would not want to do it! -- Will
Yes, ONLY to keep a museum system working, but if spares are
actually available, that would not only be easier, but more
original!
Jon
rmidable system, but it all depends on
a huge amount of software and communications systems to all
work together.
Jon
o.
Oh, just to add more, the F35 is not a "fighter" despite its
designation. It is an air superiority platform that is
never supposed to get into a dogfight. It is supposed to be
in a network of planes, and agressors will be shot down by
missile from 50 miles away. The F22 is supposed to be the
dogfighter.
Jon
ybody is still running any of these and needs
spares?
Jon
one, using all SMT parts.
Here's another (at least I think this one is different):
http://www.megaprocessor.com/homebrew.html
I did this Google search and found pages of links to such
projects :
homebrew discrete transistor CPU
Jon
uts in is wrong,
I don't know if an ASR33 can run 5 level easily, but all
I've ever used are ascii 8 bit machines.
ASR33 is an 8-bit machine.
Jon
On 05/30/2016 01:26 AM, Pontus Pihlgren wrote:
On Sun, May 29, 2016 at 10:42:30AM -0500, Jon Elson wrote:
There's a guy in Germany who did one, using all SMT parts.
Could it be Dieters MT15 you are thinking of? Quite inspiring project:
http://6502.org/users/dieter/mt15/mt15.htm
http:/
abomination had been invented? They were a joy to behold, let alone use.
I still use the Logitech 3-button "stationary mouse", ie.
trackball. They are getting harder to find.
Jon
o it.
$100?? Yikes! Well, I wear these out, so I will keep an
eye out for one at a more reasonable price.
What dies is the button switches, so I replace those as needed.
Jon
used as a data-only pack, or
diagnostics were run on the pack.
2525 and 5252 sound VERY much like test patterns.
Jon
Anybody interested?
Jon
e are LOTS of things
you can write in VHDL and Verilog that do not synthesize
into logic, and thus the simulators won't express what those
statements ask for.
Jon
ed in that manner, except for
graphing. It had a 5 x 7 dot matrix generator and would
display essentially a similar way to a glass TTY terminal.
But, if you had graphs, 3D drawings or fancy lettering, you
could draw it stroke by stroke. That was a lot slower, of
course.
Jon
ons to two guys on this list. These
were new replacements we picked up at a surplus place 30
years ago and never used. I think they will come through
fine, but will know in a couple of days. I shipped them
FedEx ground, which has always done VERY well for me.
Jon
suggestions for how to repair parts like
these?
Well, you could use a scope to find out what the good ROMS
do for access time.
Jon
it is SCSI.
There were a couple outfits that made controllers for it. I
think we had an Aviv Q-bus controller for ours.
I still have that board.
Jon
seful, and Googling "user server lift" didn't produce anything either.)
I've used an "engine hoist" around the shop to move heavy
stuff. It has an extendable beam and a bottle jack to raise
it. It folds up into a pretty small package when not in
use. These can often be had pretty cheaply.
Jon
On 07/04/2016 06:18 PM, Fred Cisin wrote:
On Mon, 4 Jul 2016, Jon Elson wrote:
I've used an "engine hoist" around the shop to move heavy
stuff. It has an extendable beam and a bottle jack to
raise it. It folds up into a pretty small package when
not in use. These can ofte
could likely lift something to the top of a 6' rack.
Jon
at is more difficult (and dangerous) with those
methods, hence the need for a "server lift".
The legs on my shop crane splay outward, so it should
straddle a single rack cabinet, and be able to approach
pretty close to the rack. The boom, at full extension come
out almost to the front wheels.
Jon
a 7/200 at work a long time ago. A VERY neat
concept, but the performance was pretty mediocre. Probably
part of the problem is that is was optimized for floating
point arithmetic, and most of what they were running on it
was integer. Ours blew a power supply and we never fixed it.
Jon
00_boards/FINCH-Adapter-Board/IMGP9584
These connectors are also available with gold contacts on
both ends. For long-term reliability, these are better.
Jon
On 07/09/2016 09:28 PM, Jon Elson wrote:
I have the bottom part of a DV-31ETA-A-A01 VaxStation
3100. It has the bottom of the case, the main CPU board
and the power supply. I think additional memory and the
graphics/SCSI adaptor were mezzanine boards, and are NOT
present in this. It was
. Tin
contacts are supposed to provide enough pressure to form
gas-tight contact areas.
And, of course, when exposed to salty air, then everything
goes downhill REAL fast, corrosion galore.
In a salt environment, I'd use semi-hermetically sealed
connectors, and still expect lots of problems.
The Navy probably knows a LOT about these things.
Jon
o see it down
inside the connector, but you can rest assured the contact
was gold-gold.
Jon
e, and a 56-bit ALU, so it can do
double-precision floating-point arithmetic without having to
double up the cycles, as the /50 does. The /65 has no
built-in channels.
Jon
D drawings, and might even be in
bitsavers archive, if they have the right manual.
These machines didn't have a huge amount of microcode, about
2000 words if no emulation options.
Jon
S of model /40s were sold in the US. EVERY one had its
own set of ALDs, with the serial number of the CPU on them.
They not only recorded the general info for the model, but
they had specific changes to reflect the exact configuration
of THAT machine.
Jon
ent of the 1401.
And, of course, the 360/85, which was really a prototype of
the 370/165. As far as software was concerned, it was just
a really fast 360, but the hardware was MUCH more advanced.
Jon
rts,
with serial numbers on them, so they knew which one applied
to which box.
Jon
, as there were very few physical
VLIW machines ever built. My guess is Trace built maybe 50 machines?
Jon
e loads from the 3 hots.
In most of these cases, the pole equipment is two separate single-phase
transformers.
These systems are out of favor, but you still run across them in older
mixed-use buildings.
Jon
The other was was a PDP installation. After excessive downtime of
third party disk drive
)
It was REALLY COOL to have my entire VMS home directory tree
magically appear on my Linux system!
I believe I had to compile vmsbackup from source, there were
some executables online but they were out of date.
Jon
I-III. Also, a lot of
drives did not correctly support SOME features that others
did. it got VERY messy. Other drives had weird timing
restrictions, or certain commands must be given is a
specific order, or they caused an error or lack of response.
Jon
putting boards in and out of the system.
(I went looking for the file and couldn't find it.)
Jon
chips.
Jon
towel. The reseating would always clear the trouble
for several months.
Jon
drives are pretty similar.
Jon
main.
I have not dealt with component problems on the KA630 itself.
The console interface is a set of 9636, 9643 and 9639 chips
(8-pin DIP). I had mine blown out about 1988 or so when a
power supply failed. There are a couple capacitors and
resistors related to that circuitry, too.
Jon
is not the terminal,
cabinet kit or cable that has gone bad, instead of the CPU
board. (I can see where a bad cabinet kit or internal cable
could cause the serial clock to change speed, that would
cause the same result.)
Jon
the VAX is not set to obey Xoff/Xon
characters) then this would happen.
Jon
tatic displays. I saw a LINC, Bendix G15 and PDP-12,
as well as the first machine Seymour Cray built in his
garage, etching the boards with his own hands!
And that was at the Moffett Field site, it must be a LOT
better now!
Jon
e
current is low, then smaller caps are no problem at all.
Jon
On 09/03/2016 10:56 AM, Noel Chiappa wrote:
> From: Jon Elson
>> needs new caps since one of the 1000uF 16V ones has bulged badly.
>> ...
>> If I go up to 25V I can get 16mm diameter which is the size of the old
>> ones.
> Capacitors
cause the sense amp
to be shunted or overloaded. I'd check all the associated
sense/inhibit circuitry before assuming it is the plane.
(Of course, you may have already done all this by swapping
boards, etc.) A blown inhibit driver could take out the
pulse transformer, too.
Jon
On 09/05/2016 05:26 PM, Mattis Lind wrote:
måndag 5 september 2016 skrev Jon Elson :
On 09/05/2016 01:59 PM, Mattis Lind wrote:
I have now concluded that the fault is in the core memory module itself.
The sense winding is broken on bit plane 7.
Have you actually ohmed out the sense/inhibit
On 09/05/2016 05:46 PM, Mattis Lind wrote:
måndag 5 september 2016 skrev Jon Elson :
On 09/05/2016 01:59 PM, Mattis Lind wrote:
I have now concluded that the fault is in the core memory module itself.
The sense winding is broken on bit plane 7.
Have you actually ohmed out the sense/inhibit
wire looped around the plane. There were dozens of
bits of wire soldered to fix the places where it opened.
Sheesh, I sure wouldn't have wanted to be the CE who had to
do that repair!
Jon
1240 series. You can use an X-windows
terminal, or connect to it with any Xserver. You do have to
download fonts and make some adjustments to the setup file
in the analyzer to make this work, however. The analyzer
mainframe runs a version of Unix.
Jon
label, but was
actually made by Yamaha.
Jon
didn't work (real time latency was laughably bad). Then,
they tried it with a real time-patched Linux, and it DID
work. This became the EMC project, now known as LinuxCNC.
We have no idea how many people are using it, but there are
indications there are (at least) several thousand users.
Jon
on the computer that manages
my home phone system (Linux-based).
The PHONES (Snom 300's) run Linux! In fact, I think most
VOIP phones have embedded Linux kernels in them.
Jon
be a few of these
drives kept available for reading ancient data tapes.
Jon
s like the upper left quadrant is
partially working, the rest of the screen is just a bunch of
loops. It is also possible that the character generator ROM
has gone bad.
Jon
file. We just typed it in live.
Jon
ors. 12-bit machine, I sort of
vaguely thought they were made by SEL or one of the
predecessors of SEL. But, that is now a 40+ year old memory.
Jon
w.theregister.co.uk/2016/01/10/turing_cathedral_fan_belts_exist_briefly_in_the_intervals_between_stars/?page=1
The second picture in the Register blurb shows John von
Neuman and others standing in front of the IAS computer.
Jon
On 09/26/2016 09:01 AM, Bob Rosenbloom wrote:
I think the analog computer is a Systron Donner 80, like
the one I have here:
http://dvq.com/oldcomp/analog/Donner/medium/d80-1.JPG
Yup, looks like a better match than the Pace that I was
thinking of.
Jon
#x27;m not suggesting this is what anybody should do, I'm just
pointing out that this material does exist, and can be used
to make some good-looking labels.
(I am also NOT volunteering to make DEC labels for anybody!)
Jon
:-)
It is NOT a joke, it really happens. The old gear outlasts
the owners, and people use it for a while, upgrade, move to
a retirement home or whatever, and it goes to someone else.
Then, the cycle repeats.
Jon
wer supply and
main board, no mezzanine boards for DV-31ETA-A-A01
VaxStation 3100. The unit is 16 Lbs, and 20 x 15 x 6"
without a box. I'd guess it would be at least 20 Lbs when
boxed up.
Are you still interested, Ian?
(Sorry to have to send this to the whole list...)
Jon
On 10/04/2016 09:47 AM, Ian S. King wrote:
Sorry for the delay in responding, Jon - I'm launching a spaceship this
week. :-) (See www.blueorigin.com.) I'll reply privately.
Oh WELL! That's SERIOUS business, then! The uVax is just
play stuff.
Jon
On 10/04/2016 05:19 PM, Ken Seefried wrote:
From: "Ian S. King"
Sorry for the delay in responding, Jon - I'm launching a spaceship this
week. :-)
May I once in my life be able to say this and not be engaged in metaphor. :-)
pssst...If Blue Origin is looking for a CSO/CISO, I&
a VME card by Excelan with an AUI
connector on it. Perhaps the model is EXOS 202. It has Rev
5.3 EPROMS. It has an Intel C82586 Ethernet controller and
an 80186.
Jon
affled for a bit, and then realized "WOW, this is Harold
Edgerton's lab!!!"
EG&G is Edgerton, Germeshausen and Grier, Inc. I don't know
much about the other two guys.
Jon
On 10/07/2016 05:12 PM, Al Kossow wrote:
ouch!
this is about 2x what I thought they would go for
On 10/1/16 7:19 AM, Al Kossow wrote:
http://www.ebay.com/itm/291894250804
Groan! I've been collecting the WRONG stuff!
Jon
the supply voltage slowly, it would
allow the cap's dielectric to reform gracefully.
Jon
On 10/13/2016 02:11 AM, Pontus Pihlgren wrote:
I'm curious what the Systems 32/77 is.. /P
SEL (Systems Engineering Labs) 32 bit minicomputer. I think
they were bought out by Gould.
Jon
ssing, etc) but the 11/45 is one of my all-time favourites.
-tony
Yup, we got an 11/45 used and ran RSX-11M with about 4 users
on it, it worked VERY well, given the limited memory we had
on it. But, of course, when we moved up to a VAX, that was
even better!
Jon
On 10/13/2016 08:38 PM, Noel Chiappa wrote:
> From: Jon Elson
> of course, when we moved up to a VAX, that was even better!
Heh. Give me an 11/45 with an Able ENABLE any day! :-)
Noel
No, the 11/45 was pretty good, but not great for image
processing and other pr
age range switch to be flipped.
Jon
emulate the DMA card on the PC. I got all this
working in a matter of weeks, and felt REALLY good! I
haven't done that sort of software/hardware project in quite
some time.
Jon
flash that a PCB house
recommended.
If the solder on the board didn't flow, it was a colossal disaster. You
had to lift the pin, scrape the black crud down to bare copper and
re-tin, then solder the lead back down.
Since then, I have used pure tin HASL, and had little trouble.
Jon
down would jam the bus.
So, I suspect that for a PDP-11 or VAX Unibus system, this
requirement does not really make much sense.
Jon
t you
really have to replace the ball bearing units for a
permanent fix. Boca Bearings has all sorts of tiny bearings
that fit fans, just measure them and order.
Jon
e required it to stay in
single-user mode. I'm PRETTY sure I ran a Bell Labs Unix on
an 11 BEFORE we got our 11/45, and those did not have memory
management. (11/05 and CalData). Our tests with that Unix
did not look promising, so we just did some testing and then
went to RSX-11M.
Jon
On 10/28/2016 03:33 PM, Daniel Olsson wrote:
Hey Jon!
Thank you for the tips, i will see if i can open it up in
someway, the fan is kinda like a laptop blower style, but
a bigger version of it :) I think i will need to buy new
bearings for it when i have read on google about the fan
The 3912 plugs into slots 24 and
25. It was used very widely in nuclear research, but also
in large industrial process control systems.
I'll check at work tomorrow, I think we might still have the
manuals for some of these modules.
Jon
acked up device controls from other models with
different word lengths, so as to have working gear for
software development.
Jon
s PayPal rules. You MUST ship within 7 days or
you are in violation.
Jon
s://en.wikipedia.org/wiki/Computer_Automated_Measurement_and_Control
I have a 3922 crate controller and a 3953 auxiliary crate
controller at work. I also have manuals for the 3911 PDP-11
crate controller and 2912 LSI-11 bus adapter and the 3953.
These have schematics in them.
I THINK the 3912 may be an LSI-11 (QBus) controller, not Unibus.
Jon
in little panels and then assemble. It might be better to
send it to somebody with better equipment.
We still use a bit of CAMAC only because we have the
infrastructure to do it.
Jon
On 11/02/2016 12:10 PM, Brian L. Stuart wrote:
On Tue, 11/1/16, Jon Elson wrote:
Also, some IBM publications (where I'm more
familiar with their models) had some photos
of machines that probably were in-house
prototypes that were quite different than the
production version.
Alon
ent bins and
crates that way. I used to build CAMAC modules for nuclear
research as a business. I made my own crate and crate
controller for module testing. It was just the backplane,
no card slots, which was fine to have access to probe the
boards.
Jon
et it recompiled on Linux using FPC in
just a few days, and it runs fine (better in fact than the
original).
And, of course, it is again maintainable!
Jon
Hi Rick,
On 2016-11-03 10:51 AM, Rick Bensene wrote:
...I've got a bunch of new tension bands
I don't have an answer to your question, but am curious as to where you
acquired the replacements.
Thanks,
-Jon
opped only a very small voltage across the
series-pass transistor.
Jon
dropped only a very small voltage
across the series-pass transistor.
Jon
Am I getting this right?
So they take AC turn it to DC then turn it back to high
frequency AC then turn it back to DC to drop the need for
larger capacitors to keep the DC clean?
Pretty wild.
Yes, that's how the 360&#
5vdc, power supplies set me back maybe $300 or
less. Could probably adjust them down or get similar units
or higher quality stuff from surplus (Pioneer Magnetics, etc)
Switching supplies can be as clean as you need them to be,
just a matter of proper filtering.
Jon
lathe) and run them each off a properly-sized VFD.
2-phase in, 3-phase out, plus variable speed and dynamic
braking.
Jon
On 11/07/2016 10:31 PM, Jon Elson wrote:
On 11/07/2016 07:59 PM, Mark Linimon wrote:
On Mon, Nov 07, 2016 at 11:23:58AM -0800, Chuck Guzis wrote:
But if you're a suburban resident living on Mulberry
Street, anything
but single-phase is pretty much out of the question.
Oh, you can g
ases. That was fairly common for stuff that
didn't draw massive amounts of power. Sounds like QUITE a
project!
Jon
I've never heard of anybody having success with it.) They
produce high frequency square waves at 400 V, and will do
great damage to electronic loads. They work great for
motors, although the HF square waves can cause noise issues
in sensitive electronics like tape and disk drives.
Jon
h the voltage. So, the POWER draw changes with load, but
the line current changes much less!
Jon
or $202.50 this time around. Anyone here take the chance on it?
Note the shipping is $150!
Jon
that's it.
Anyone has a reliable source for this type of capacitor:
http://i.imgur.com/P0Nz5KW.jpg
I can't say for sure, but the best place for caps is
Mouser. I've been able to source a number of special caps
from them.
Jon
uires the seller to accept the
transaction.
Jon
be scarcer
than hen's teeth, but the HV caps are easily available.
Jon
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