On 02/05/2016 12:16 AM, Jim Stephens wrote:
On 2/4/2016 9:30 PM, Jon Elson wrote:
I was there on a tour, a few years earlier. I think they
still had the model 195 at the time.
A vast facility filled with big blue boxes.
They had two 195's at McAuto in STL. We may have gone on
the
me and
go as the disk rotates.
Jon
y
drive's pad was, one from a cassette might not be big enough.
Jon
AX 11/780 they had different array
boards and memory controller when going from 4K to 16K DRAM
chips.)
Jon
oards. I THINK we
had a total of 256 KB, and one Friday afternoon one of them
died and we had to run over the weekend with only one board,
so that would have been 128 KB. Yes, it was a bit tight on
memory, but we got a LOT done on that machine.
Jon
o 4
users/machine. We often had 8+ users plus batch jobs
running on our 780.)
Jon
On 02/11/2016 10:56 AM, Jerome H. Fine wrote:
>Jon Elson wrote:
>On 02/11/2016 08:56 AM, Mark Wickens wrote:
It's good to hear that the VAX was a cost-effective
solution - there are
too many stories about how expensive DEC gear was, but I
imagine they
primarily came after
rker to ID the density. Once the density is
identified, it SHOULDN'T allow you to change it in the
middle of the tape.
Jon
X/VMS 3.6
VAX/VMS 3.7
VAX/VMS 4.0 3 disks
VAX/VMS V4.1 UPD BIN 4 disks
VAX/VMS V4.2 BIN RX01 MANDATORY UPDATE
VAX FORTRAN 3.4
VAX PASCAL 2.3
Microfiche:
VAX/VMS 3.6 SRC LST
VAX/VMS 4.2 SRC LST
-Jon
Hello again,
On 2016-02-15 2:41 PM, Jon Auringer wrote:
Hello all,
I have a bunch of VAX/VMS media that need a new home. I must move them
very soon and I have little time for shipping. Pickup from 53714
(Madison, Wi) preferred.
I have found someone to pick up the DEC stuff in a very timely
he TLA520 to step through to the specific word of the
packet and then if a certain range of bits was all zeros,
trigger the analyzer. This was really great, as the failure
would only happen every 3-5 minutes. I suppose the HP
analyzers have a similar capability.
Jon
'm just spoiled by what a
typical machine can do now.
Jon
HYPERchannel:
https://en.wikipedia.org/wiki/HYPERchannel
https://en.wikipedia.org/wiki/Network_Systems_Corporation
-Jon
mail message
never takes less than 30 seconds, and often stalls for
minutes. It IS working better than right after the
changeover, but I can't believe most users aren't up to the
torches and pitchforks stage. Thank GOD I don't have to
deal with this abomination from home.
Jon
ere "cards". Not sure where I first saw
the term motherboard, or if it really implied it had
substantial active circuitry on it.
Jon
On 03/02/2016 10:41 PM, Bob Rosenbloom wrote:
On 3/2/2016 5:41 PM, Chuck Guzis wrote:
Here's another one from 1956:
https://www.youtube.com/watch?v=33OFJEWUgQE
Looks like a Bendix G15 at about 2:03 in the second video.
Yup, absolutely, that is a G15.
Jon
or machines
installed in 1956. The Philco S-1000 and S-2000 were
supposed to be the first mass-produced transistorized "real"
computers, in 1957.
Jon
roprietary
printed ribbon cables.)
Jon
t 1W, but I use a 10W
Ohmite fusible (or at least flame-proof) resistor.
That is the 40J25RE, and I get them from Digi-Key.
Jon
On 03/05/2016 06:53 AM, Robert Jarratt wrote:
My ISP appears to have stopped updating the newsgroups it hosts.
What news servers do people round here recommend?
I've been using GigaNews for some time, when my ISP dropped
their news service.
Jon
outputs, etc. It used battery-backed DRAM, and was made
around 1978.
Jon
a couple AH 12 V Gel Cell
battery. The charger for the Gel Cell ran when the control
power was off, so it was supposed to maintain the memory
indefinitely - except the memory power switch had a dirty
contact and would dump the memory every couple of weeks.
Jon
On 03/09/2016 08:43 PM, Chuck Guzis wrote:
On 03/09/2016 08:49 AM, Jon Elson wrote:
The row of red LEDs at the bottom of the pic is the front
panel of
the 7300 CPU. They had an industrial control bus that
allowed you to
connect a wide variety of interface boards, like encoder
counters
t all densities.
Jon
On 03/24/2016 04:40 PM, Jecel Assumpcao Jr. wrote:
Jon Elson wrote on Thu, 24 Mar 2016 10:34:48 -0500:
What density and format is this tape? Not all drives
support all densities.
I actually mentioned this detail to his advisor when they were
discussing this topic after his student's de
his house!
There used to be a picture online, but his page seems to
have gone away.
Jon
On 03/30/2016 10:40 AM, Jon Elson wrote:
On 03/29/2016 10:01 PM, Jim Brain wrote:
Somebody mentioned a house with a collapsed floor. A
friend of mine bought two 770/145s
Ugh, 370/145
Jon
icrocode cycles, the /145
took something like 7+. A 32 bit add register to register
was 1.4 us, add memory to register was 2.4 us. Floating
point divide was 28 us (short) or 88 us (long).
Jon
Just in time for her 50th birthday in November:
https://www.youtube.com/watch?v=Kko526UpHsM&feature=youtu.be
www.hpmuseum.net
oppies and magnetic tapes have some kind of binder to
hold the oxide to the backing, and it does deteriorate over
time. Ozone and other air pollution probably makes it go
bad faster.
Jon
icky, instead of slippery,
material. If you can get to it, you can sometimes scrape
the sticky material off with a knife to produce a better
surface. On a (one sided) floppy drive, the pressure pad is
part of the drive, not the media.
Jon
Jon
The drive did a
little bit of backing up and retrying, but I got 100% data recovery.
I've had some other tapes that were not stored in proper conditions
where all the oxide fell off and collected on the tape heads. (I'm
referring to 9 track tapes, here.)
Jon
On 05/21/2015 01:19 AM, Jochen Kunz wrote:
Am 20.05.15 um 22:41 schrieb Jon Elson:
It largely depends on storage conditions.
Sorry I can not afford a climate controlled cabinet. The tapes where
stored in my "machine room", i.e. a normal bedroom in my flat.
The "bad" conditi
TLA 710 /TLA 720 series that are basically DAS9200's.
These are often cheap on eBay. They are able to be connected to the
net, and you can access them from a Linux PC.
Jon
iting resistor. I did the mod on ours
by adding the resistor to the LED lead, as the bulbs were pretty tall
above the board.
Jon
On 06/01/2015 04:03 AM, Christian Corti wrote:
On Sat, 30 May 2015, Jon Elson wrote:
Is there a good reason why filament lamps were used on minicomputer
front panels until the mid 1970s? Things like the PDP11/45, Philips
P850, etc
all used filament bulbs, not LEDs.
Inertia! The 11/45 was
ree media, but if you had that, you could dump or
restore a 40 MB Calcomp disk to 45 IPM Pertec mag tape in under ten
minutes, including rewind.
It was a total block for block copy, not a file by file copy, so the
tape was pretty useless except for restoring again to a disk pack.
Jon
?
UGH! You can't guarantee this would work on different vendor's hardware.
Jon
ut right
now my basement office is in boxes as we clean up renovate after a burst
water pipe.
Boca Bearings has just about any bearing you could want. I've rebuilt
some noisy Dell computer fans with their bearings.
Jon
formatters used air bearings to give the most vibration-free
rotation of the spindle.
They were generally pretty open units, not like disk drives, and were
run in clean rooms by people wearing low-dust overalls.
Jon
next
head.
I watched this being done a number of times.
Jon
ut these
would be earlier than the ones I had seen.
Jon
works
great. I have email going back to 1997, and
have imported it from mail reader to mail reader as I
upgraded. I can use search functions to find old
email addresses and messages, and use the filters to sort
various list messages to the proper folders.
Jon
68K processors as the main CPU
in any of their machines. (There could, possibly, have been
68Ks in some of the peripherals.)
They had their own 16-bit mini architecture, loosely based
on HP's stack oriented minis.
Jon
System/7 was introduced in 1971, so it was about a whole
generation before the VAX, introduced in late 1977.
Jon
e discrete transistor
implementations, a real flip-flop was too expensive, but a
latch could be implemented in about 6 transistors, I think.
The 11/45 used TTL ICs, so real FFs were available in that
technology, although they may have used latches as well.
Jon
retty early TTL, and the
original 74xx family did have some 6-wide latch devices that
used less power than the equivalent 6-wide full D FF.
Jon
LINCTAPE. You could copy your system tape to the hard drive
and then boot off that by setting a different instruction on
the front panel switches, and it ran like lightning.
Jon
On 07/15/2015 01:24 PM, Noel Chiappa wrote:
> On 7/14/2015 7:36 PM, Jon Elson wrote:
> On the system 360 CPUs, they did not use flip-flops like we are used
> to, today. They used latches ... Since these were discrete transistor
> implementations, a real flip-
od 3" longer too but I didn't
think that would cause problems either.
Do the original fans have speed sensors? There were several
different versions of this. Some fans have an OK signal,
some give a pulse once per rev. Did the original fans have
3 wires?
Jon
s with the Pertec interface, and I
kludged-up a board that will read my archival tapes, but it
would be nice to have one that makes a more direct connection.)
Jon
failure! Darn! I sent it off to
somebody on the list, no idea if they were able to fix it.
Jon
rt of guy we're dealing
with, here. Seems your deletion of this member was VERY
deserved!
Jon
er. (This is a fairly
expensive setup, I got my home station on eBay.)
Jon
On 08/01/2015 09:40 PM, Chuck Guzis wrote:
On 08/01/2015 07:05 PM, Jon Elson wrote:
When repairing CPU motherboards with bad caps, this is a
really big
problem. I dilute the lead-free solder with leaded
solder, this
helps lower the melting point to where two soldering
irons (one on
each
work well, and
the larger sized tips have no shortage of thermal conductivity.
(The above are not stand-alone irons, but need an
electronically-controlled station.)
Jon
asonic KX-P3151 Daisy Wheel Printer Operating Instructions
-Jon
On 08/03/2015 03:40 PM, Al Kossow wrote:
On 6/10/15 8:17 AM, Jon Elson wrote:
I got a Pertec key to tape system surplus, and created a
mostly software interface with very minimal hardware to
read and write tapes on my S-100 Z-80 system.
XL-40?
The system I had was, I'm pretty sure,
indeed made by Pertec. The title
block of the drawings doesn't have anything real obvious,
but there is a bunch of legal boilerplate advising the
restrictions on use of the drawings, and the last words are
"prior written permission of Pertec".
Jon
On 08/03/2015 10:48 PM, Jon Elson wrote:
OK, I verified it was indeed made by Pertec. The title
block of the drawings doesn't have anything real obvious,
but there is a bunch of legal boilerplate advising the
restrictions on use of the drawings, and the last words
are "pri
I've thought that using the PRU
(attached 32-bit, 200 MHz micorcontroller) on the Beagle
Bone would make a really great formatted Pertec interface.
One problem is limited memory directly on the PRU, I haven't
learned yet how to use the bulk system memory from the PRU.
Jon
with different thermal profiles to find out what
gives the best soldering results.
Jon
puter dies, you can troubleshoot it and be sure it is
running in just a few minutes, and then get on to the real
problem.
The VAX 11/780 had an LSI-11 with a floppy controller and an
interface board to the VAX, so I think it was down to 3
boards or something.
Jon
a case
where a really old program got renewed, cleaned up and
prepared for another couple decades of life.
Jon
, you only have
to figure out which row of chips is which bank, and which
column is which bit. Depending on what docs exist, that may
not be real easy. Last resort is to trace wires on the
board to see which chips are wired to which bus lines and
address decoders.
Jon
oblem.
Jon
On 08/15/2015 08:55 PM, Jay Jaeger wrote:
On 8/15/2015 8:31 PM, Jon Elson wrote:
On 08/14/2015 02:58 PM, Jay Jaeger wrote:
No, I didn't write any of what was quoted. ;) If one is going to remove
the entire message quoted, then it probably makes sense to delete the
"wrote&quo
old it together.
Jon
died.
So, cleaning the card edge connectors and backplane
connectors may help.
Jon
cheme wanted to put it at. This was pretty easy to do in
later VMS systems.
Unfortunately, this type of misconfiguration is fairly hard
to detect with software. Later devices (MSCP) had an
autoconfiguration scheme where the OS would assign the CSR
and vector at boot time.
Jon
witches or jumpers on the board. Some of the more modern
controllers, like MSCP controllers, setup the vector
through software.
OK, what I USED to know is just fading away! Yes, what you
say makes perfect sense.
Jon
y are totally incompatible, so make sure you
get drives compatible with your interface.
Jon
On 08/22/2015 12:20 AM, Ali wrote:
Jon,
Enough Pertec drives were made so that manuals should be no problem.
Some other makes were made in fairly small numbers so manuals may be a
problem.
I should have been more clear - the manuals were for the ISA interface card
and the accompanying SW not
nally came back up, and the CP/M OS I had on
the drive still worked!
I guess I've had a few more cases where something went poof,
but that is one of the ones I still remember well.
Jon
Laboratory INstrument Computer) was one's
complement, with a 12-bit word. Several derivative machines
were the same. The most confusing, of course, were the
LINC-8 and PDP-12, which had the PDP-8 instruction set with
two's complement, and the LINC instruction set, with one's
complement, all in the SAME machine. SHEESH!
Jon
ort of
tabular form.
AFAIK, the PDP-1 was the only DEC 1's compliment machine
that shipped.
The LINC part of the LINC-8 and PDP-12 were one's complement.
Jon
experiments at Lawrence Berkeley Labs
in the 90's, they were dismantling the HUGE round building
the Bevatron had been in. I think most of the actual
Bevatron was long gone. A guy I work with currently did
work on the Bevalac back then.
Jon
found a Romex staple
had been driven through the Romex, severing the safety
ground and tying it to the hot! This was back before outlet
testers were common items. Well, that explained some blown
chips, etc.
Jon
d a fire, don't we?
I've never met a residential electrician that would even
know the WORD "megger". Certainly, they don't use them to
check house wiring.
Jon
lders and big computer gear were often set up this way.
Jon
On 08/27/2015 09:18 PM, Kevin Tikker wrote:
Thanks very much for the link. Maybe there is one out there
I believe Lewis and Clark College in Godfrey, IL had a 1620
that I saw in about 1980. I have no idea if anyone in the
area still has it.
Jon
.
I also knew a fair bit about Versatec printers back then, if
anybody ever wants to get one of those hideous machines running.
If anybody is interested in these drivers, etc. let me know.
Jon
t;
brass shim stock. Develop the resist and etch in ferric
chloride. it is important to shrink the apertures so as not
to get too much solder paste on the chip's pads. The finer
the lead pitch, the more you have to shrink the apertures.
Jon
On 08/28/2015 12:41 PM, Jon Elson wrote:
On 08/28/2015 11:52 AM, Paul Koning wrote:
On Aug 28, 2015, at 11:44 AM, Mark J. Blair
wrote:
...
Well, I guess I'll need to build a little convection
tape baker, then. Maybe I'll use something like an
Arduino to control the temperature.
On 08/28/2015 12:55 PM, Mark J. Blair wrote:
On Aug 28, 2015, at 10:41 , Jon Elson wrote:
The trick is to poke a tiny thermocouple into a plated through hole in one of
the boards. Then, the controller is measuring actual temperature. I tried
having the thermocouple in the air, and the
On 08/29/2015 01:01 AM, Mark J. Blair wrote:
On Aug 28, 2015, at 19:46, Jon Elson wrote:
Then, the only problem is the temp variation across the size of the oven, which
can be considerable.
I'm thinking that air circulation should be helpful to reduce hot spots,
whether I'm baking
quare. The trick is, it has to be VERY accurate to
line up with existing PC boards. I mostly use it to make
solder paste stencils, now, but originally made it for PC
board master artwork.
Jon
stabilize the core
temperature. The 360/40 and 360/50 had heaters for the
local store (register stack). Not sure about the 360/30
where local and main store were all in the same unit. Not
sure if the higher machines also heated the main store.
Jon
ttp://pico-systems.com/photoplot.html
I built this in 1996, as soon as red laser diodes became
available. (I'd been trying to make it work with LEDs
before, but the optics got difficult.) I just converted it
over recently to run off a Beagle Bone computer.
Jon
On 08/30/2015 05:09 PM, Chuck Guzis wrote:
On 08/30/2015 02:00 PM, Jon Elson wrote:
I hacked a fiber optic light pen onto a Calcomp plotter
and made some
artwork directly onto film, and then in 1996 I built a
laser
photoplotter that cranks out 1000x1000 DPI images on
red-sensitive
film at
llers that copied the
TM-11 register layout. These were used with a variety of
Pertec unformatted drives.
Jon
ther side! I cut the trace at both ends and put a
piece of wire-wrap wire to tie them together. I peeled the
shorted track off the board, and there was NO TRACE
whatsoever of what could have been causing the short. I had
expected there was a little pit in the epoxy laminate that
got plated, but no such thing!
Jon
e with way more pins.
This one is 256K and 70 ns access time.
http://www.digikey.com/product-detail/en/AT28HC256-70JU/AT28HC256-70JU-ND/2050794
If you REALLY need it fast, Winbond has a 45 ns EPROM, but
not in stock at Digi-Key.
That's their W27C512-45Z
Jon
.
Well, it could be the delay line is going bad.
Jon
orm:
http://members.iinet.net.au/~some_name
and see if you can access ANY of them. From both my home
and work IP, I can not get ANY of these pages to respond.
If you want to see my page, it is :
http://pico-systems.com/ring/ring.html
Thanks for any help or info you can offer!
Jon
figure out from the man page how to increase it.
Not a DNS problem.
Thanks,
Jon
LONG time ago. I guess
I ran it on a MicroSoft C compiler.
Jon
On 09/10/2015 10:38 PM, Alexis Kotlowy wrote:
On 11/09/2015 12:52 PM, Jon Elson wrote:
On 09/10/2015 09:07 PM, Alexis Kotlowy wrote:
Can you do a traceroute to members.iinet.net.au? In case
DNS is blocked, the IP address is 203.0.178.90. I've been
on iiNet since they bought out my previou
AU web sites.
Ah ha! I see that iinet.net.au and members.iinet.net.au
resolve to DIFFERENT IP addresses.
(Neither of these respond to pings, but that is not that
unusual, lots of facilities don't allow pinging from outside.)
Jon
couple months ago, for
certain. I can't remember the last time it did work, but it
wasn't all that long ago. The members.iinet resolves to a
different IP address.
Jon
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