://imagizer.imageshack.com/img922/5776/wimiv2.jpg
I'd guess it is a multichannel data logger that writes the
data onto cassettes.
Jon
On 03/11/2019 02:35 AM, ben via cctalk wrote:
IBM 360 32 bits 16 word reg file - 16 bit word.
While some 360 models had a hardware architecture of 8, 16,
or even 64 bits, all of the 360s (except the model 20, which
was not really a 360) had 16 32-bit registers as the program
saw it.
Jon
microcode.
Jon
Interface). I made a horrible hack of an FPGA board I make
to read tapes through a PC's parallel port. it works, but
is real slow.
Jon
On 03/19/2019 09:51 PM, W2HX via cctalk wrote:
The pertec-to-SD project sounds very cool. Keep me in mind if you need
testers/buyers.
Yes, me too! I still have a working 92185 (Keystone) drive,
and could be interested if your design is not too expensive.
Thanks,
Jon
m and a
screw-on cap to pour the paint in. it was kind of like a
miniature compressed-air paint sprayer that carried its own
air supply.
I have no idea if these are still available.
Jon
uments for that project.
Oh, one other issue is the 360's had no FFs. All storage
elements were transparent latches, and they generally used a
4-phase clock. All this is pretty well documented between
the ALDs and the FEMM's for the particular model.
Jon
, always flaky connectors!
Jon
on:
http://www.bitsavers.org/pdf/ibm/360/fe/
Jon
several other manuals in the set that are not
specifically "ALD"s, but are part of the set, such as
microcode listings and FLT (Fault Location Test) manuals
that reflect ECOs and options.
Jon
be a HUGE BLACK MESS with spilled toner dust -
don't ask how I know this!
I have a 5M, but I think the mechanism is the same.
Jon
check on the fuser
thermistors, but the corona supply is open-loop on most
printers. There is also a self-check on the laser, as the
beam has to hit a sensor to start the timing of the pixels.
So a failed laser or polygon motor will cause an error.
Good luck with it!
Jon
HUGE BLACK MESS with spilled toner dust -
don't ask how I know this!
Jon,
Based on the info coming through on the list a "cold" fuser would produce
toner that would wipe off/flake off of the printed sheet. This is not
happening in my case so I am guessing the fuser is getting ho
VERY limited machine, max of 32KB of
memory, but most had a LOT less.
There was RPG for it, but most were used for off-line
spooling of cards and printing, or RJE systems.
If there is a 370 there, possibly there could be control
units for that machine in the collection.
Jon
/itm/seltene-Anlage-Puma-Computer-IBM-2020/202646831828?hash=item2f2eb142d4:g:izoAAOSwhV1cpw
Oh, yeah, I did NOT recognize those dual tape drives with
horizontal vacuum columns.
Obviously real IBM, but I've never seen them before.
Jon
.pdf> as well as manuals at
http://www.bitsavers.org/pdf/ibm/2415/
So, is that a capstan and pinch roller drive? I'd kind of
guess so, if announced in 1965.
(for future readers, 2315 is apparently a typo, 2415 would
fit in with 24xx models being tape drives, 23xx was for disks.)
Jon
On 04/08/2019 10:26 PM, Adrian Stoness via cctalk wrote:
whats with the weird tag on this thread?
%20 is an escaped form of the space character. Some mail
programs escape all control characters, or even anything
like {} ~.
Jon
than anything else.
Yikes, I doubt anybody has manufactured these in the last 30
years. I have one, but don't want to get rid of it until I
scrap all my old tapes.
Jon
On 04/10/2019 03:38 AM, GerardCJAT via cctalk wrote:
I would like to emulate a TTY, using a daisywheel typewriter.
Well, there are Qume and Diablo. Diablo was bought by
Xerox, so some of them carry that label.
Most of the stand-alone versions had serial (RS-232) ASCII
interface.
Jon
manufacturing. They made disk and tape
drives, printers, hand-assembled close to 20,000 mainframe
CPUs plus all the controllers and memory, between 1965 and
1969. Totally mind boggling!
Jon
s and printing
directly would have). So, while fast, it didn't run
efficiently.
Slower 360's could keep busy by multiprocessing, and thus
get more work done.
Jon
, near as I can tell.
Yes, the 14xx were character-based decimal machines. The
7070 was a word-based decimal machine aimed at the business
market. The 709x were word-based binary machines.
Jon
/34? Wasn't the /34 all TTL?
Jon
, was pretty crazy, somewhere around 60 A at 208 V 3-phase.
Jon
went to 3-wire planes.
Jon
On 04/18/2019 03:15 PM, Noel Chiappa via cctalk wrote:
> From: Jon Elson
> As soon as somebody figured out that you could combine the sense and
> inhibit wires, everybody immediately went to 3-wire planes.
I"m suprised the idea wasn't patented. Or maybe it was
?
Is the ROM totally bad, or just losing a few bits here and
there? If the latter, you could probably read it out, figure
out how the rows, columns and characters are mapped, and fix it.
Jon
hout training
the OCR. Not sure anybody would be interested in it, anyway.
Jon
brute force sysgens was
so RSX-11 ish.
I think VMS 1.5 still had a bunch of utilities running in
PDP-11 emulation.
Jon
cs to load, I'm not
exaggerating. Maybe I didn't have enough memory on it, and
of course an MFM disk is kind of slow, too.
Jon
e with the monitor
attached). I have read that this can be caused by "faulty
i/o devices that interrupt the cpu continuously". What
else can be done to locate the source of the problem?
Check for disk fragmentation?
Jon
On 04/29/2019 02:23 PM, Al Kossow via cctalk wrote:
On 4/29/19 9:30 AM, Jon Elson via cctalk wrote:
Back in 1984 I had cloned a Logical Microcomputer Co. Genix system based on the
Nat. Semi. 16032 chip set. I had a dd
dump of the distribution on floppies, but that was unreadable.
I just
if it is a computer tape drive or an
instrument / data logger...
I'm pretty sure it is a digital/computer drive. It really
looks military to me. Possibly from some test gear.
Jon
CPUs, and was a VERY good
deal in terms of price/performance.
Jon
nd to copy /dev/whatever to myfile.iso.
Or, better than that, just put it in just about any computer
and read the files, copy to a directory on hard drive, etc.
The ISO-9660 format was designed to be OS-agnostic, so you
can read the files on any OS.
Jon
ow to install or update a system.
Jon
online, but I was wondering if any in depth
troubleshooting material existed online (Logic probe points, debugging
steps, etc...).
Well, first thing to check is that the bus is properly
terminated, and that memory requests are being properly
acknowledged.
Jon
made a 32-bit mini.
The VAX 11/780 was completely done with off-the-shelf ICs.
Later VAXes went to semi-custom ICs, and the MicroVAX line
used full-custom ICs. I suspect many other makers were so
small, they could only use off the shelf parts.
Jon
the compressor over a variety of
conditions.
He developed several replacements for the banned R-12, and
got patents on them. But, I don't think he ever made any
money with that, the HUGE chemical giants saw to that.
Jon
I just discovered a binder with 2 IBM 1620 manuals. A quick
check shows bitsavers has these and newer editions of them.
So, does anybody want :
IBM 1620 Central Processing Unit, Model 2 (Form A26-5781-1)
and
IBM 1620 Monitor II System Reference Manual (Form C26-5774-0)
Jon
g signas onto a bunch of FM
carriers, and a standard for multiplexing several analog
signals onto one FM carrier.
Apollo documents are probably VERY hard to come by these days.
Jon
On 05/20/2019 05:38 PM, Carl Claunch via cctalk wrote:
On 05/19/2019 09:46 AM, Jon Elson via cctalk wrote:
There's a switch labeled "IRIG" which stands for Inter Range
Instrumentation Group, and refers to a standard for
telemetry encoding. There is a standard for time code
most of the tiles. Anything poured on
the floor would run down between the tiles.
Jon
is polling the serial module, and that module is
apparently not acknowledging the request.
Jon
On 05/13/2019 10:57 PM, Jon Elson via cctalk wrote:
I just discovered a binder with 2 IBM 1620 manuals. A
quick check shows bitsavers has these and newer editions
of them.
So, does anybody want :
IBM 1620 Central Processing Unit, Model 2 (Form A26-5781-1)
and
IBM 1620 Monitor II System
on this machine.)
Jon
On 05/26/2019 10:44 AM, Jon Elson via cctalk wrote:
On 05/26/2019 12:13 AM, Mister PDP via cctalk wrote:
Ok, small update. My M8043 (DLV11-J) just arrived today.
It seemed in good
condition so I confirmed it was set up correctly (9.6k
baud and console on
J3), built a serial cable from the
aily, and then break it down
by user and compute a $ amount based on a formula that had
been agreed upon.
It is Clifford Stoll, IIRC.
Jon
maintenance
contract) that had the bad adhesive in them were replaced
years ago. As far as I remember, there IS no removable
cover on those HDAs, they were hermetically sealed except
for a tiny, filtered, pressure relief vent.
I think the procedure to update those HDAs was a pretty
involved disassembly.
Jon
idual hear arms, to get them closer to the heads.
Jon
long-lasting, but the black ends that snap in tend to crack
after a while. These small parts could likely be reverse
engineered and made on a 3D printer.
Jon
On 06/07/2019 01:06 PM, Chuck Guzis via cctalk wrote:
On 6/7/19 8:25 AM, Jon Elson via cctalk wrote:
My experience with them is that the seal bands are quite long-lasting,
but the black ends that snap in tend to crack after a while. These
small parts could likely be reverse engineered and
minal, but
not a whole lot more. Obviously, no way to call a subroutine
without a stack.
Well, glad you found it!
Jon
On 06/11/2019 06:33 AM, Paul Birkel via cctalk wrote:
I wonder what the unlisted 20 ICs are for, and what they are?
I think the 23B are microcode ROMS, and the 441 seems to
be clerical error.
Jon
module. Close inspection of that is strongly advised.
Jon
great help in a
multi-user system. The original PDP-11 with 56 KB of memory
was pretty limited. Great for DOS-11 and RT-11, but more
complex OS'es needed more resources.
Jon
On 06/20/2019 08:50 AM, Bill Gunshannon via cctalk wrote:
V6 will run on an LSI-11/02 with 28KW of memory.
28 KW is 56 KBytes, which is the max on most non-MMU CPUs.
Jon
service. Don't go with the
cheapest, they could go out of business anytime. My
secondary DNS provider did just that, a month after I paid
up for 2 years.
Jon
the drive itself (not
the formatter) needed to detect this and set various
circuits correctly, like read preamp gain and slicer threshold.
Jon
f you google "magnetic tape viewer" they have pictures of
what I think the earlier poster described.
Jon
be very much harder
to read.
Jon
that has sharp contrasts like letter
outlines and line drawings.
Jon
reed switch type, a Hall sensor type, and maybe a
capacitance type. The key switches should be able to be
replaced fairly easily. Special keycaps will be a harder
problem to solve.
Jon
On 08/02/2019 02:40 PM, Kevin Bowling via cctalk wrote:
Anyone have one of these? I'd like to find a system, but images of
the OS media would be interesting.
I have some bits of several Series/1 systems, but no
complete system at all.
Jon
h a huge amount of
interrupts.
We also got a disk development lab donated from IBM that was
all run by S/1 systems. They scrapped those and a bunch of
the SLT/MST interface gear, and replaced it with modern stuff.
Jon
annel architecture to
serial ports, where the 360/370's were hurt very badly by
interrupt load.
Jon
company made. I know a few of them
were built by others that worked there. Most programs were
entered through the front panel switches.
This was probably about 1976 or so. Display was via an
oscilloscope.
It was called the Mike Smith 1. I've never found any
reference to it online.
Jon
PDP-11 code in them, but I did not
look very closely.
Jon
ibbon cables with both flavors of interface, never straight
ribbon cable.
Jon
separate
institute for each area of specialization, it would just
dilute the resources. Every one of them used Ohms law and
its derivatives.
Jon
, but I think we are pretty far from
that level of rigor.
Jon
.
Jon
allow
ringing to settle on the data lines and prevent short
crosstalk pulses from affecting the clocks should make the
system very tolerant of cable issues. But, maybe some
engineers didn't really optimize their logic for these problems.
Jon
rawls through FTP
sites :-)
I kind of wonder what this is all about? I mean, why do you
have to encrypt today's weather report, a company's public
web page, and such stuff. Just to waste CPU time?
Jon
MAJOR pain, and I would blacklist those companies.
Well, E-teknet has never done that to me. (The flying probe
tester leaves TINY dots on the pads, so you can tell whether
a board has been tested or not.)
Jon
e PDP-8 era to the VAX 7xx series.
Jon
Jon
l, as far as I know.
Jon
something that wouldn't be necessary for normal operation.
Not knowing anything about this system, but you might check the card for
a bad Tantalum capacitor.
Jon
om 2016 about the Prime 2250 you tried to buy, but
can't find any mention of the outcome. Did you have any luck with the flaky
seller?
-Jon
case
some to straighten it, put the boards back in, and it fired
right up! The machine was later returned to the US and was
used as a
"test mule".
Jon
der
line. I looked at the full headers.
In fact, Thunderbird is going to send a direct email to you
at your LCM address without my doing
anything.
Jon
he 1050 hard on that system, it was printing a line about
every 10 seconds for about 14 hours straight every week day.
Jon
from about 7 AM to 7 PM. I think they finally
got a CRT for the tape operator. But, they kept the 1050 as
main console for the hardcopy record.
Jon
buzzing as it was doing start/stop about as
fast as it could go. Or, are you referring to the whine as
it went into rewind?
The 200 IPS Hitachi drives on our 360 were much louder in
the rewind, you could hear it anywhere in the machine room.
Jon
air
conditioner, 11/780, RM05, RP07 and then the TU77. When the
drive was not running flat out, the bup-bup from the tape
columns was not real loud, but when you were pushing data
fast, like BACKUP with /buffers=5, it made a pretty steady
BRR noise.
Jon
what that coating is.
It's some kind of nitride, but I have no idea how it is applied.
Jon
On 03/04/2017 10:35 PM, Mark J. Blair via cctalk wrote:
On Mar 4, 2017, at 17:09, Jon Elson wrote:
Hmmm, on our TU77, the vacuum pump was not that audible, but then it was in a
room with a LOT of noise.
My memory might be faulty, since it has been about 25 years since I've heard a
TU
ir pressure, to make
the tape float over the capstan, or vacuum, to make the
capstan grab the tape.
Jon
seen them in
any local stores. Are they only available as an online option?
I have converted our kitchen to LEDs. See :
http://pico-systems.com/Lighting.html
Not exactly cheap (the LED lighting power supplies are
pretty expensive) but they are working quite well.
Jon
03 W, the LED supply draws 21 W, as measured with a real
power meter.
Jon
. A 2-tube 48" fixture consumed 103 W.
So, I really wanted to get those ballasts out of the
system. The new system with commercial LED lighting power
supply uses 21 W. The light output seems to be about the same.
Jon
7;t think you had
to add any software to make that work.
Also, seems a VT220 or a bunch of other terminals would do
Tek 4010/4012 emulation. Lear Sigler ADM36, GraphOn come to
mind.
Jon
the
skew alignment test point and see the skew pattern pulsing
as the supply reel rotated, meaning the tape got
differentially stretched while sitting on the reel.
But, glad they were so successful in their effort!
Jon
if the hardware tape control decided those gaps were
the end of data.
Jon
then updated to a VCB-02 (8-bit color).
Jon
't have it
anymore. What are you guys doing to get these and
equivalent chips?
I have some 27C256, don't know if those are compatible.
Alltronics in San Jose (or thereabouts) used to have a
massive stock of older chips.
Jon
On 03/17/2017 02:56 PM, Peter C. Wallace via cctalk wrote:
We need to move our business and I have about a ton of
classic cimputer junk in the SFBA that need to go or get
scrapped:
You, too, Peter? Wow, this is sure a small world! I'm
still getting rid of a few VAX items.
Jon
may not be recoverable.
Some other people have a lot of experience with baking the
tapes at low temperature to improve the chances of good data
recovery, you you might see if they want to do it, first.
Jon
CF cards
anymore, they are about a decade out of date.
Jon
means it was a complex task to
reorder all the atomic operations and pack into the long
instruction words for best throughput.
I think it might end up looking a bit like the optimizers
that were used on drum memory computers back in the dark ages.
Jon
901 - 1000 of 1414 matches
Mail list logo
