cremented A and incremented B until A went negative. It
did this for each nibble. I'm guessing a 16-bit add took
over 100 us. I'd ALMOST reject calling this a COMPUTER!
Jon
when they worked
on core memory. I figured all these guys were LONG gone.
Jon
On 11/18/2016 06:04 PM, Chuck Guzis wrote:
On 11/18/2016 03:15 PM, Jon Elson wrote:
OH, yeah! Besides the limited instruction set, short registers only
half populated, etc., did you know that the 360/20 did not have an
adder? It could only increment/decrement. The data paths were only
4
On 11/18/2016 10:17 PM, Chuck Guzis wrote:
On 11/18/2016 07:59 PM, Jon Elson wrote:
Yes, I think it had to, as it had no adder. Had to be
incomprehensibly slow. I guess it would load the memory to an
internal register a piece at a time.
The last time I dug around a bit for model 20 software
03 printer.
The /20 was very limited, and not a general purpose 360.
There was also the 360/22 and 360/25 that were variants of
the /30 model. One was cheaper, one was a little faster.
But, if they were doing mostly RPG work, then a /20 could do
that.
Jon
.
Jon
On 11/20/2016 05:30 PM, Charles Dickman wrote:
On Fri, Nov 18, 2016 at 6:15 PM, Jon Elson wrote:
OH, yeah! Besides the limited instruction set, short registers only half
populated, etc., did you know that the 360/20 did not have an adder?
This made me curious about how primitive it was, but
/SY33-1024-0_2020_FEMDM_Vol_1_Apr69.pdf
(pdf) pages 15 and 38 Data flows and ALU schematic
Yes, indeed, it seems to show a quite different architecture
than what I got from the part I referenced.
I had better stop as I am no expert on a 360/20, and the
text SEEMED to contradict the schematics.
Jon
0 and
above)."
Perhaps the ALU is only present on late model machines?
That would be a HUGE difference between different serial
numbers, so I'd rather doubt it.
Jon
Let me know what more pictures or information would be helpful in knowing
if it is worth saving. I can take pictures of the terminals.but if
anything specific is needed off of the Triad main let me know.
On Nov 23, 2016 11:58 AM, "william degnan" wrote:
> On Wed, Nov 23, 2016 at 9:50 AM, Jay We
words
from various devices and packs them into buffers to send via
USB.
Jon
tion wagon that would fit it. The others
came up short by just one inch!
Jon
e pins MIGHT be compatible with AMP pins for the "M" series of
connectors. If so, I have some of these pins at work that we will
likely never use. If you can send a photo of the end you have I can see
if it looks like it might work.
Jon
pins.
The holes in the housing and the springy fingers are all standardized,
so AMP parts will fit Winchester shells, etc.
Jon
ltibus II board with 2 8-bit DACs
on it. Output for an XY scope?
Jon
backplane slots. I may have
been designed that way to fit in a specific slot in a specific machine.
On the other hand, the pin count on the wider edge connector is 100 rather
than 86 so not Multibus.
OK,better eyes solve the puzzle!
Jon
, this is to implement the "butterfly" mirroring of the addresses for
the FFT.
Jon
parallel input and output registers). The /44 lacked
all character and decimal instructions, but the floating point
performance was close to (or in some cases can even exceed) the 360/50
performance.
Jon
eaningful. Wow, sounds like a big
project.
Jon
m would run in a day, instead of a couple
WEEKS
Then, of course, The LINC was a discrete transistor machine,
ran off a plain 120 V outlet, didn't require air
conditioning beyond typical office environment, etc. And,
it had a CRT display that was used for OS interaction,
program editing and viewing data. That was also a big step up.
Jon
t one of these days.
Is your drum in good condition? Ours was full of dust, and
3 tracks had been ground down to the brass due to dust
packing under the heads.
Jon
On 12/30/2016 01:09 AM, Mark Linimon wrote:
(as you might imagine, most coding was done in machine
language -- the compilers trying to deal with this was a
nightmare. And waay slow.)
Yes, supposedly the Algol compiler took two days to run on a
modest program.
Jon
On 01/02/2017 02:39 AM, Christian Corti wrote:
On Fri, 30 Dec 2016, Jon Elson wrote:
Is your drum in good condition? Ours was full of dust,
and 3 tracks had been ground down to the brass due to
dust packing under the heads.
You can relocate bad tracks as there are a couple of spare
tracks
wasn't relieved during manufacture.
And, nobody expected a 195x machine to be running in 2017,
especially as anybody in the computer business knew those
transistors were right around the corner, and would almost
certainly replace tubes.
Jon
a from the read head, except
when a word was being written. Each drum track had a long
line (for program and data) and a short line. Most of the
short lines held 4 words, so they were quickly accessible.
One short line only held one word, that was the accumulator.
Jon
next sector.
So, there is no inter-word gap to accommodate the write head
switching? I guess if everything is hard-synched to the
clock track, then you can get away without that. Interesting!
Jon
need a rig to slowly turn
the drum while evaporating the nickel. Some other research
labs at universities might have the necessary equipment,
also - check with the Physics department (or electrical
engineering).
Jon
are pretty much useless
because
of the extremely common 40 pin male IDC plug, and my searches in the valley
have come
up empty.
Hmmm, Digi-Key used to make cables to order with this type
of termination. Surprised they don't have the parts anymore.
Jon
s
easy to apply...just spin up the disc and pour!
http://www.radar58.com/temp/drum.jpg
http://www.radar58.com/temp/drum2.jpg
Yup, that looks pretty "oxidey" all right!
Jon
On 01/04/2017 12:09 PM, Jon Elson wrote:
On 01/04/2017 09:08 AM, Al Kossow wrote:
I need some of these for making Diablo disk drive cables.
Mouser/Digikey, etc. have a
minimum buy of 500 (at $9 ea).
Picture at
http://multimedia.3m.com/mws/media/140452P/ts0005-pcb-connector.jpg
Anyone see
and pure ethanol are the things
I've seen used to clean magnetic media.
if there is a spot that is not actually used (maybe other
parts of the gouged tracks) you could test various solvents
with a Q-tip to make sure they don't cause damage.
Jon
le to make sure it doesn't cause slow
deterioration. And, of course, with a general idea of the
material (plated nickel vs. oxide/epoxy) you can select
solvents that are known to not attack that material.
Jon
point blank.
Jon
w. But, it did
get me to learn my way around Unix.
Then, I managed to get a MicroVAX-II system, and ran that
for 21 years, from 1986 to 2007. I did eventually move away
from the VAX but kept it running for the home environment
monitoring. In 2007 I moved that last app to a PC running
Linux.
Jon
system.
So, I had a 300 LPM drum printer on an S-100 system.
All I have left of it is the core plane cards and a few
other bits.
I also have a PDP-8 core plane.
Jon
repurposed into a 360 unit record controller.
Germanium transistors on SMS cards!
Hope you have strong floors!
Jon
On 01/11/2017 06:58 AM, Erik Baigar wrote:
Hi Jon,
thanks for your mail - the Alert looks interesting (I also
collect such
vintage Ex-MIL gear).
I have a Honeywell Alert. It is a 24-bit aircraft
computer that was originally designed for the X-15 project.
It was the 2nd "mass-pro
with the rest of
the gear.
Wow, seriously cool!
Jon
B5 20 RIM
08 = CR
54 65 6c 65 70 68 6f 6e 65 20 44 65 74 61 69 6c 73 =
"Telephone Details"
53 65 6c 65 63 74 20 = "Select "
Jon
documentation or a LOT of careful tracing and deciphering.
It would be trivial to attach some CMOS static RAM to it,
though. I think it will eventually get donated to the CHM.
Jon
EMC
from NIST running, the A-B was turned off for good.
http://pico-systems.com/images/S_AB7320D.jpg
Jon
read the
time code. It didn't see the video signal at all, just got
sync pulses on the remote control connector, and one audio
track in and out. Mostly sold to people making videos of
scientific results. I sold about 20 of them.
Jon
On 01/11/2017 11:11 PM, Bob Rosenbloom wrote:
On 1/11/2017 8:45 PM, Jon Elson wrote:
I also have an Allen-Bradley 7320, a CNC machine tool
control. The heart of it is a 7300 "industrial
processor" 16-bit minicomputer. I used it for a year or
so to run a retrofitted Bridgeport milli
.
I kept it running until 2007, when the hard drive croaked.
By that time I had a cast-off SCSI 4 GB drive.
Jon
text files included with the
source code.
Jon
of those multi-purpose
monitors that have 20 connectors on the back might be a good
one to try, they try to support all formats and electrical
interfaces.
Jon
and I was in hog heaven.
Jon
o that could be
an issue.
Noel
LCD computer monitors may not handle interlaced video. I'm
sure some of them do.
But, I suspect all LCDs that can be used as TV monitors will
handle interlaced just fine. So, if it has a composite
video input, it will have interlace.
Jon
exactly a one button operation to get images, what with
all the darkroom processing, but I might use it some day. I
mostly use it now to make solder stencils for board
manufacturing.
Jon
d up the memory, but it was
quite a difference.
Jon
On 01/13/2017 04:52 PM, Toby Thain wrote:
On 2017-01-13 7:24 PM, Jon Elson wrote:
On 01/13/2017 12:16 PM, Al Kossow wrote:
On 1/13/17 10:05 AM, Toby Thain wrote:
AUD $25,000 for a Linotype L100 PostScript imagesetter
(used).
I have a laser photoplotter I built a long time ago to
make
x27;s functions, and also unpack run-length encoded
data on the fly.
Jon
On 01/13/2017 06:42 PM, Antonio Carlini wrote:
On 14/01/17 00:06, Jon Elson wrote:
I eventually got a MicroVAX-II to replace it, and, yes,
that DID have a cache to speed up the memory, but it was
quite a difference.
I'm reasonably sure that the uVAX II did not have a memory
cache. I
wall wart power supply, and a ring of PC
board material. One possible problem with the 9" working
distance is the eyepieces might be too high for comfort.
You might end up having to use a lowered table for it.
Jon
't have a subroutine that called another
subroutine, using their surroutine call/return
instructions! I never knew that!
Jon
nicely
without aids. But, SSOP and the big flat packs benefit
greatly from magnification. A steady table, so the
microscope doesn't bounce is quite important, too. I've
done down to 0.4mm lead pitch on some chips that are beyond
the capability of our P&P machine by hand with the microscope.
Jon
o the context of the System/360. I can't imagine how
much CPU time was wasted when people forgot to save R14 before calling a
deeper subroutine, causing an infinite loop.
Jon
On 01/14/2017 05:40 PM, Rick Bensene wrote:
From: "Rick Bensene"
- A Tektronix 4132 Unix workstation using a National 32016 CPU and a
4.2bsd port called UTek
Jon wrote:
Gee, how does it perform? I built a clone of a Logical Microcomputer Co. 32016
Multibus system and got
cleaning.
Jon
On 01/15/2017 10:20 AM, Al Kossow wrote:
On 1/14/17 6:29 PM, Jon Elson wrote:
I got versions of Genix and Xenix with it.
Do you still have Xenix?
I don't think so, but I'll look a bit more. I may have
overwritten those with Genix.
I do have the 24 or so Genix install disks. Thes
kept
hot while the solder is pulled out. This is kind of in
between the two other types.
Jon
esh solder before attempting to
desolder. Could be better heat transfer, or just easier to suck up a
larger blob.
Especially helpful with lead-free boards, but it does help
heat transfer. You need the heat to get all the way to the
other (component) side of the board for the desoldering to work.
Jon
a godsend! It
was absolutely reliable, I never had corrupted files again.
(Oh, it was faster, too, of course.) I had this on an S-100
system.
Jon
re is some mention of a /55, but what
is different about it from a model 50?
Thanks,
Jon
, but was very
flaky. I was able to store some words into the core memory,
but it seemed like every couple minutes it would zero out a
word or two (I guess it was failing to write back the
contents after the destructive readout.) Without
schematics, it was impossible to do much about it.
Jon
ah, I think the rack cabinet I have matches the one in
your photo.
Jon
classiest
front panels around!
Jon
On 01/18/2017 07:08 AM, geneb wrote:
On Tue, 17 Jan 2017, Jon Elson wrote:
On 01/17/2017 01:50 PM, geneb wrote:
I used to work on a 727 flight simulator that used a
Varian 620 to generate the visuals. The display was
capable of addressing 1024 points of light and that's
how the ru
On 01/18/2017 12:45 PM, geneb wrote:
On Wed, 18 Jan 2017, Jon Elson wrote:
Wow, kind of surprised they were concerned about that.
Especially a 727 sim, who the heck is still flying THOSE??
They're pretty common in South America and some 3rd world
countries. I suspect it was 90% B
one of those for a friend.
He built it and uses it with FlightGear.
Ahh, yes, YOU are the guy with the F-15 front end! Yes, we
know OF you!
And, yes, FlightGear is completely amazing.
Jon
is
pulled over the bearing. So, the ONLY thing that actually
touches the data surface of the tape is the head and the
cleaner blade. Still, on deteriorated tapes, it starts
getting pretty bad. On good tapes from my archive, it just
takes a cleaning of the head after every reel.
Jon
ively supports 800
(NRZI) and 1600 (PE).
Of course, the controller/interface could fail to support
the 800.
Jon
On 01/20/2017 08:42 PM, Chuck Guzis wrote:
On 01/20/2017 05:50 PM, Jon Elson wrote:
If the drive is a CDC 92181, then it natively supports 800 (NRZI)
and 1600 (PE). Of course, the controller/interface could fail to
support the 800.
I've sent an email to the seller asking the model o
e-numbered part or a custom.
Jon
k anybody put actual executable code in there.
Jon
ifted, and you
will find a standard 28-pin (I think) DIP chip with a button
cell wired onto the top of the chip. The ones I've opened
were not totally filled with epoxy, the IC package acted as
a sort of dam to prevent the cover from completely filling
with the stuff.
Jon
one of the
"really old" ones, the battery can be replaced and you are
good for 5 years or so. There must be TONS of these old
clock/RAM chips out there, and somebody must have saved a few.
Jon
boards (IBM SMS
cards) are pretty fragile, easily damaged during rework, and
some of them dissipate a lot of power, causing slow thermal
degradation.
Are we SURE this isn't a preview of the April 1st edition?
Jon
On 01/23/2017 09:04 PM, Chuck Guzis wrote:
On 01/23/2017 05:45 PM, Jon Elson wrote:
WOW That is QUITE amazing! And, I can't possibly imagine why
anyone in their right mind would do this! Seems an emulator on a PC
would be faster, and way more reliable, not to mention taking up MUCH
On 01/23/2017 07:45 PM, Jon Elson wrote:
This blog seems to indicate that there is NO 7074, but an
emulator running on 370 hardware.
http://nikhilism.com/post/2016/systems-we-love/
This makes a lot more sense, some of these microcode
emulations were still available of fairly late machines
a
character machine. There is a fair amount of info on it
that seems to confirm this. Also, the stated speeds seem to
be invariant for short vs. long (10-digit) operations,
pretty much proving it was a word machine.
Jon
On 01/24/2017 12:00 AM, Chuck Guzis wrote:
On 01/23/2017 09:42 PM, Jon Elson wrote:
On 01/23/2017 07:45 PM, Jon Elson wrote:
This blog seems to indicate that there is NO 7074, but an emulator
running on 370 hardware.
http://nikhilism.com/post/2016/systems-we-love/
This makes a lot more sense
. If it uses a baud rate divisor chip rather
than a more flexible divider, it may not be able to go faster.
Jon
sure those preceded the 70xx series.
Jon
On 01/24/2017 08:57 PM, Chuck Guzis wrote:
On 01/24/2017 06:37 PM, Jon Elson wrote:
On 01/24/2017 12:38 PM, Chuck Guzis wrote:
Was the 7070 IBM's first machine with a wire-wrapped backplane?
--Chuck
No, all SMS machines used similar wire wrapping. So, I think that
goes back to the
0,000 transistors, 22,000 diodes on 14,000 circuit
cards. TOTALLY mind boggling.
And, the 7074 was a serious computer, given the vintage.
Either 4 or 6 us core cycle time was QUITE good in 1961 or
so. 10 us instruction execution time was pretty decent.
Jon
On 01/25/2017 12:19 AM, Chuck Guzis wrote:
On 01/24/2017 10:01 PM, Jon Elson wrote:
And, the 7074 was a serious computer, given the vintage. Either 4 or
6 us core cycle time was QUITE good in 1961 or so. 10 us
instruction execution time was pretty decent.
I find the whole period amazing
be a bit more
aggressive with solvents.
Jon
-rp4vyPPYu1ZjVRbnlyczV4czQ
Oh, you use India Ink for black. You should be able to also
get colored ink. There used to be many sellers (Pelikan,
Rapidograph, Rotring, Kohinoor etc.) of these. In the US,
Blick art supply may be about the last place to carry such
things.
Jon
side to set the voltage. There
WERE some devices that had relays inside that switched in
the multiplier on the rectifier when powered from low voltage.
But, most older 120/240 devices needed to have the input
circuit selected manually.
Jon
purchase price! That's a pretty BIG computer!
I also noticed "good time" of 42 Hrs / week, and an MTBF of
4.9 Hrs.
Jon
was a REALLY
nice printer.
Jon
On 01/29/2017 10:27 PM, Jon Elson wrote:
I think we had an Odec chain printer that another group
gave us to use on our VAX. I hacked it up to shut off the
chain motor when it wasn't printing, and then restart it
when print data came in. It had a HORRIBLE habit of
running the ribbo
On 01/31/2017 06:45 AM, David Gesswein wrote:
On Sun, Jan 29, 2017 at 10:27:49PM -0600, Jon Elson wrote:
I think we had an Odec chain printer that another group gave us to
use on our VAX. I hacked it up to shut off the chain motor when it
wasn't printing, and then restart it when print
is certainly a part of a core memory system, made by
Electronic Memories. Does the other side of the board have
a core plane on it? Memories from that vintage often have
multiple boards, with select drivers, sense amps, inhibit
drivers, decode logic and timing, as well as the core planes.
Jon
g on when
they are sampled, you can get a high, low, or indeterminate
state. Also, the LA may have fixed threshold voltages that
may not correspond to the actual thresholds of the logic you
are testing.
Generally, you would clock the LA off some master clock in
the unit under test.
Jon
less than $750 for it, it will do 100 MHz on 288
synchronized channels, with a 128K record length. But, it
is bigger than a big kitchen microwave, and much noisier, too.)
Jon
.
Jon
ns range, but the
operation of the chips is most likely NOT going to depend on
the circuits responding to such glitches. I think you are
chasing your tail about these things, and missing a real
malfunction that is not related to this. Could be EPROM
bits that have faded, one shot capacitors that have changed
value or something.
Jon
art,
then they won't work.
Jon
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