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> Both Apollo and SUN did this. The clocks were two phase so one ran
> behind the other. It was a hack.
Sun did not do this. The Sun-1 CPU was indeed a 68000 to which was
coupled a custom MMU in discreet logic. It didn't handle demand
paging. Sun soon switched to the 68010.
-Jon
s, the
label is pretty scratched up...) and at least it's not all ones, but without
something to compare it with, it's pretty difficult to say if it's damaged...
Would anyone out there be kind of enough to provide with me with
another image?
-Jon
On Fri, Dec 19, 2014 at 8:19 PM, Josh De
ter
tapes. the first vote info is all electronic, but if there
is a recount, the paper tapes can be examined.
Any voter can also opt for mark sense ballots.
Jon
this.
Jon
jaws, if
that doesn't work it dumps the part and tries another one.
The toaster oven reflow soldering is amazing. I use a ramp
and soak controller with a thermocouple poked into a through
hole in the PC board for temperature reference.
Jon
burn off the silver to make a black mark.
Jon
You can choose styles (round, square)
height and width.
Jon
e some hint at the
behavior. (Don't bother trying to look at the raw tape head
signal, it will be really tiny.) I'm not sure where the
read amps and slicer are, whether they are in the control or
the drive. (Seems like the read amp HAS to be in the drive,
though, for noise immunity reasons.)
Jon
a day or two. Also, the silver paper was QUITE
expensive, maybe close to a Dollar a page or something, even
back in the 1970's.
Jon
t the paper turned brown within a day or so just
sitting on the desk makes me think there would certainly be
no paper remaining usable for this printer. The same type
of system was used for some years after for making medical
quick copies on ultrasound and similar machines. Usually,
these were on about 5" wide paper, though.
Jon
On 10/14/2015 09:00 AM, Paul Koning wrote:
On Oct 13, 2015, at 11:27 PM, Jon Elson wrote:
...
Yes, I had a bunch of Versatec 1200A's with the Tektronix hard copy feature.
the Versatec was the greatest graphics printer until laser printers came out,
then they became instant boat an
Rod's Retro Restorations - IBM360
Are you actually restoring a 360? I'd sure like to hear
more if you are working on this!
Jon
rked the same way, it sounds like
maybe it was allowed to drip down and go dry when not
printing. That might have been the cause of the clogging.
Jon
run. (Of course, with the SLT
modules, spares would be a REAL problem.)
Yup, for sentimental reasons, I still have my MicroVAX-II here.
Jon
On 10/14/2015 01:07 PM, ben wrote:
On 10/14/2015 9:05 AM, Jon Elson wrote:
On 10/14/2015 09:15 AM, Rod Smallwood wrote:
OK so if we agree there are three classes computer
Namely Micro,Mini, and Mainframe.
It follows that there must be three classes of vintage
computer.
We dont need patches
On 10/14/2015 10:32 PM, ben wrote:
On 10/14/2015 9:21 PM, Jon Elson wrote:
Carl has a IBM 1130
http://rescue1130.blogspot.ca/
Fascinating! And, of course, with discrete transistors,
it should not
be that hard to keep the electronics running.
The mechanicals look like a pretty major repair
hreads are permanently drilled and tapped to
specific positions in the rail.
Jon
there were other memorex units
there, too.
Jon
s. It might have been a stripped-down version of
what eventually became the 360/22, /25, or maybe /30, but it
didn't seem to really just be a version of one of those just
in black. The same machine is shown a number of times at
the end of the video. Anybody know?
Jon
y 360/40 console, if anyone can help :)
Steve.
I believe these were just commercial Microswitch lighted
pushbuttons. You may still be able to get colored buttons
for them and engrave or label the legend.
Jon
they will, you are welcome to them.
I also have a bunch of the two-piece buttons that are more
typical of the Honeywell switches, they have a colored
insert and a clear snap-on cover. You can put a piece of
film between these to create a legend.
Jon
You might try digging on Digi-Key, they have a very good
search engine, and you may be able to select qualifiers that
lead you right to the part you are looking for.
Jon
up is closing in on 6000 members!
Jon
On 10/23/2015 04:32 PM, geneb wrote:
On Fri, 23 Oct 2015, Jon Elson wrote:
I sell some hardware for motion control based on this
software, and have sold over 300 controller-interfaces.
A popular one seems to be using MachineKit on a Beagle
Bone Black
Yes, my latest product is the
ave a desktop mill
that I built mostly for taking to shows that uses my
controllers and drives.
You can check out the LinuxCNC.org web site, and see what
others are doing in the retrofit area.
Jon
use for it. I think mine was smaller than the one in the
Wikipedia article, but it did look similar to that. There
are some on eBay, but they are all from France and Belgium.
Interface was pure serial RS-232.
Jon
WAS the same as the picture on the
Wikipedia article, I couldn't tell the scale from that pic.
Jon
On 10/25/2015 08:32 PM, william degnan wrote:
On Oct 25, 2015 8:54 PM, "Jon Elson" wrote:
On 10/25/2015 05:27 PM, Mike Ross wrote:
A pull-out keyboard in the base? I have one too. Would be perfect if
it worked, and I had half a dozen of them!
No, mine did NOT have a pull-out or
l in several depth
steps just less then the desired diameter, does a finish
pass at full depth to bring it to final hole size. This
takes longer to describe than it actually takes the machine
to perform, and leaves beautiful holes.
Jon
On 10/27/2015 11:59 AM, Chuck Guzis wrote:
On 10/27/2015 09:33 AM, Jon Elson wrote:
The ultimate way to drill holes in Plexi is with an end
mill. It can
make a slight chipping when it punches through the back,
so you
either need a backstop material or lighten up the feed a
bit just
before
On 10/27/2015 05:23 PM, Eric Christopherson wrote:
I'm curious: Does the static from the peanuts noticeably affect
electronics?
Have you ever had them cling to your arms or whatever? Yes,
definitely. That's why they have green and pink peanuts,
those are supposed to be anti-static.
Jon
on them. I don't have the resources to check the contents of
the disks.
There is a single page color promotional flyer for SCO Integra.
Are these of interest to anyone?
Here's a picture: https://www.flickr.com/photos/jja572/albums/72157660431177871
Available for beer money and shipping from 53714.
-Jon
PC UTILITIES AND DRIVERS
ENHANCED GRAPHICS ADAPTER - UTILITY DISC
All of this in a HP 82301A BASIC Language box.
Again, beer money & shipping from 53714.
-Jon
with it is NOT BiAx, however.
Jon
e, but DOES have hardware multiply and
divide.
I have gotten it to run, sort of. Since I have no memory
for it, I can jam op codes into the data in plug and observe
the speed at which the memory address ripples.
Jon
integrated circuits. The
first was the Apollo Guidance Computer.
Jon
program won't support a Q-bus board on a MicroVAX-II.
Jon
On 10/30/2015 12:04 PM, Christian Corti wrote:
On Fri, 30 Oct 2015, Jon Elson wrote:
Also, you log shows MicroVAX I, so it is possible the
program won't support a Q-bus board on a MicroVAX-II.
Oh, that was a typo. It actually says this:
B DUA0
2..1..0..
Emulex VAX Monitor
9=B9o=C9=94
Jon
were
already in production, but certainly were a huge help as
chips became more complicated.
There are probably other projects in this vein.
Jon
x27;t see the point.
Jon
oying when you flick your eyes across the panel.
Jon
ntial access
the register set of the 360 was local store (or local storage)
microcode was in control store
and, there is a LOT more of this that escapes me at the moment.
Jon
ly identical to DECtape. I think the
directory format is different, but I think the block format
is the same. I think the tapes are wound in reverse order
and the order of increasing block numbers is reversed.
Jon
: contains cctech
cc: contains cctalk
This seems to catch all variants of the messages and put
them in their folder.
Jon
On 11/23/2015 09:59 PM, Toby Thain wrote:
Although not always. It's gratifying to see Altera Quartus
runs on Linux.
Xilinx Ise also has run on Linux for at least 5 years now.
The webpack version is free, and supports up to fairly large
devices.
Jon
ame memory
box that would shut it down if there was an abnormal voltage
or cooling failure.
Jon
on the UVAX-II system. (I don't
have my print set anymore.)
Jon
t the original program working with minimal effort
directly under Linux. It runs a lot faster, too.
My only complaints with Pascal were the I/O was a bit clunky
and slow, and the stupid / vs. div for real vs. integer
divides. Otherwise, I really thought it was great.
Jon
On 11/25/2015 01:34 AM, Robert Jarratt wrote:
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Jon Elson
Sent: 25 November 2015 02:05
To: gene...@classiccmp.org; discuss...@classiccmp.org:On-Topic and Off-
Topic Posts
Subject: Re: Replacing MicroVAX
rbo Pascal / Windows XP executable I have been using.
But, I haven't used it for any new projects. (Yet.)
Jon
, I read the circuit the same way.
Jon
regulator itself go bad, it was always the contacts. Maybe
we just got lucky. (This was also about 1977 - 1980, so
parts have probably deteriorated a lot more since then.)
Jon
t set anymore, but I highly doubt it. I
think the +/- 12 V is only used by serial comm boards, and
possibly by some graphics boards. I would not be surprised
if the regulation of the 12 V supplies is not very precise.
Jon
On 12/05/2015 12:29 PM, Robert Jarratt wrote:
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Jon Elson
Sent: 05 December 2015 18:03
To: gene...@classiccmp.org; discuss...@classiccmp.org:On-Topic and Off-
Topic Posts
Subject: Re: Memory Voltage on
transfer. Every once in a while I'd pull all the boards
and vacuum out the backplane and gently vacuum off the
boards. That sort of helped, maybe.
The external UVII memory also had ribbon cables across the
boards. Rough handling of these cables can cause intermittents.
Jon
ing of the command signals is just
different enough that the drive thinks this is wrong. Sorry
I can't give more specific help.
Jon
a time to find which one is bad.
And, of course, it could be the power supply itself!
Jon
Later they got some IBM 2260's, which were
Zenith 9" TV sets and a keyboard connected to an interface
box in the machine room. Very primitive, but very
interactive, great for quick program editing and submission.
Jon
d something that might be human readable, there was a
machine called an interpreter, and it would type the symbols
on the top of the card for you.
Jon
odels) have standard power connectors. All the Dell boxes
do have proprietary shape/size power supplies, but in a
pinch you could hang one outside the box.
Jon
ne. All it had was a
keypunch-style keyboard and the TV, all the electronics were
in the machine room.
Jon
ne. All it had was a
keypunch-style keyboard and the TV, all the electronics were
in the machine room.
Jon
llowed to use the 2260, though.
Jon
frame computer rooms in the 1960's.
Page 2-29 has the description of the magnetostrictive delay
line, see :
http://www.bitsavers.org/pdf/ibm/2260/Y27-2046-3_2260_2848_FETOM_Mar68.pdf
Jon
! (Or possibly having him dumped in a nearby body
of water with concrete overshoes.)
Jon
t now, except that the power supply in the drive chassis
died the last time I tried it and haven't had time to fix it. I believe
the drives are from fujitsu. I believe the drives were mainly used as
NFS mounts for other UNIX boxes.
-Jon
essor valves. (This is called
automatic dual-mode control, when the tank is full, it
unloads the compressor and leaves the motor running for a
minute to see if there is more demand for air before
shutting it off.)
Jon
ed. The delay was often
heard, as LAP-6 spent 99% of the time refreshing the screen.
If it was real flip-chip modules with the little molded
plastic handle, that would have been a LINC-8 or PDP-12.
Jon
nice.
I'm pretty sure the desktop on the system 360 and 370
machines were also chipboard with laminate.
129 keypunches were certainly chipboard with laminate, but I
think the 029s were steel, with a laminate applied to it.
Jon
On 12/18/2015 09:27 PM, William Donzelli wrote:
I have a spare 029 that got wet, so the desk portion expanded.
Definitely chipboard.
Sorry, I was thinking of the 026!
Jon
I had a 15R resistor and a 12V DC 21W bulb in
parallel, on the -12V output.
Cold light bulbs draw WAY more current than when the
filament is hot. Not sure if a 21 W 12V bulb could draw 20
A cold, but it might.
Jon
dding capacitance in
parallel to the existing capacitor.
Jon
built out of a bunch of HUGE inductors and capacitors. It
might actually be a decent solution for keeping
museum-quality gear running in an unaltered state, but it
isn't something you could whip up in a couple hours in your
garage.
Jon
On 2015-12-23 7:18 AM, Antonio Carlini wrote:
Can someone with the digital edition clarify whether it really is a PDF
or not?
If you look at the online version, there is a "download" link to the
.PDF in the upper right corner. It downloads and reads just fine.
Thanks Jay!
-Jon
was a problem would be getting the disk spindles
turning at the right speed.
Matching the available voltage would be the other detail,
but a standard voltage adjusting transformer would do it
fairly simply.
But, the ferroresonant transformers needed the right frequency.
Jon
, all the holders, adapters, etc.
are gone. The rest of the stuff was all badly gummed-up.
Jon
all worked
flawlessly.
I can imagine some difficult circuits where you couldn't get
away with this, maybe a magnetic read amp or a timing
circuit or something, but I think in most cases a Silicon
transistor will work well.
Jon
don't work without something connected to the AUI
cable. Just totally guessing!
Jon
Yes, I also want to wish everybody, and Jay, especially, a
merry Christmas and a happy new year!
Jon
iller.
Jon
here anymore, the lines are WAY too bad for
that. I used to have DSL way back when. I wish I could get
symmetric cable speeds here, 30/30 would be FANTASTIC, as I
run a web server here. I live with 60/5, but rumors are that
we will get upgraded to 100/10 sometime fairly soon.
Jon
They charge for it because people
are willing to pay for it.
Jon
ch gets re-used. Works great!
My insane friend Walter turned his Tek RM35 scope into a TV,
and watched TV on a 5" green screen while he was in
college. Hmm, Walter also cloned a Data General Nova with
piles of TTL chips. Probably very little by AMD or Intel in
there, either.
Jon
ly designed to make this easy to do.
I'm guessing a few other terminal programs have the same
sort of capability to run scripts to send commands to a
foreign OS and log the result.
Jon
scale Ferarri roadster. He made
EVERYTHING himself. Dashboard instruments, tires, ignition
coils and spark plugs, and on and on. I saw it at the NAMES
show in 2004, I think. Totally awesome. And, it took him
12 years!
Jon
On 01/15/2016 09:44 PM, ben wrote:
On 1/15/2016 6:59 PM, Jon Elson wrote:
A guy in France built a 1/3 scale Ferarri roadster. He
made EVERYTHING
himself. Dashboard instruments, tires, ignition coils
and spark plugs,
and on and on. I saw it at the NAMES show in 2004, I
think. Totally
tires.
Jon
sition in that bit of the LRCC.
Jon
On 01/16/2016 02:31 PM, tony duell wrote:
800 BPI (NRZI) only has transitions on a data track when
As I understand it the TU58 is not NRZI.
WHOOPS! I Somehow read that as one of the 1/2 9-track tape
drives!
Jon
sh was supposed to cure that, and I think it
did. But, that finish was not as durable as the magnetic
coating, and would start to shed all over the drive, leaving
stuff on the data surface. I think about 5 years after the
stuff came out, most data centers searched out and trashed
all these tapes.
Jon
On 01/18/2016 10:56 AM, j...@cimmeri.com wrote:
On 1/18/2016 11:33 AM, Jon Elson wrote:
There was a tape sold by a few manufacturers (I think
3M's was called Black Watch) that had a coarse black
matte finish on the back side. A problem with some
drives which had fast rewind speeds was
backups of my MicroVAX system with no trouble at
all. I did have to clean the tape head after every tape,
but that wasn't greatly different from when the tapes were new.
Jon
On 01/18/2016 11:53 AM, j...@cimmeri.com wrote:
On 1/18/2016 12:46 PM, Jon Elson wrote:
Last year I read in some 1993 backups of my MicroVAX
system with no trouble at all. I did have to clean the
tape head after every tape, but that wasn't greatly
different from when the tapes wer
On 01/27/2016 11:24 AM, Murray McCullough wrote:
I learned today of the passing of a true computing visionary, Marvin
Minsky He of artificial intelligence fame. We in the classic computing
fraternity, and computing in general, can enjoy our ‘hobby’ because of
his work.
Yup, sad day!
Jon
or something. I couldn't
find anything on the 3101. Is it a glass TTY or does it respond to
any cursor positioning, etc. commands?
It definitely has cursor positioning commands. I ran one on
a CP/M system, and added in the cursor and other commands on
a configurable editor and used it for some time.
Jon
ly
boards that croaked were Dilog and such 3rd party boards. I
did have a thermal safety system that would cut power if the
cooling failed (which it never did). I later got a
tangential blower for the expansion backplane, and it was a
good deal quieter, but maybe didn't move enough air.
Jon
ould handle that many channels. The cluster of
3270's also suggests a 370 system, although they certainly
could be used on 360's.
The SMS boxes displayed the volume label of the tape to
mount. Mounting the wrong tape was a BIG problem in large
systems, so a number of vendors came up with these sorts of
schemes to try to reduce those errors.
Jon
On 02/04/2016 08:57 PM, William Donzelli wrote:
Some models of 3420s were 7 track.
Yes, I suppose there was a need in some installations to
handle old, archival tapes. But, I certainly never saw
one. Most sites got rid of their 7-tk stuff as soon as they
could.
Jon
On 02/04/2016 11:22 PM, Chuck Guzis wrote:
On 02/04/2016 08:25 PM, Jon Elson wrote:
On 02/04/2016 08:57 PM, William Donzelli wrote:
Some models of 3420s were 7 track.
Yes, I suppose there was a need in some installations to
handle old,
archival tapes. But, I certainly never saw one. Most
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