On 10/05/2017 10:53 AM, Al Kossow via cctalk wrote:
On 9/29/17 8:56 AM, Henk Gooijen via cctalk wrote:
Now I'm looking for 8" mag tapes/reels that will fit!
http://www.ebay.com/itm/311973810676
even a good brand.
Those all look like 10.5" reels.
Jon
rive (make & model, physical
configuration, etc.)
At least the Memorex SASI drive/controller I put on my CP/M
system was really basic, as far as I remember.
Jon
extra
handshake lines. The physical interface was as simple as
could be, the software was also quite simple. I used the
INIR/OUTIR instructions on the Z-80 that were pretty close
to a DMA operation.
Jon
in his
house. A total fool's errand due to the power consumption.
Jon
e RTTY any more. There are a plethora
of digital modes used by hams, though.
Jon
f DEC made the basic
mechanism, however.
--Chuck
I'm sure DEC did NOT make the actual wheel motor assembly.
Qume and Diablo were the two biggies in that arena.
Probably because of patents and copyrights, you couldn't
just make compatible daisy wheel font wheels, either.
Jon
s early HBA's relied on parity
checking in software, which meant that it could simply be
ignored.
I looked up my SASI interface, and I didn't see any parity
circuit there.
Jon
hotos.
jon
later products that were limited to VAXELN, but can't
recall any designations...
I think it would be VERY hard to remove instructions from
the 78032 CPU chip. You could leave out the
floating point processor, and maybe do things with the gate
arrays to restrict memory size and such.
Jon
imple format.
Jon
On 10/13/2017 09:46 PM, Chuck Guzis via cctalk wrote:
On 10/13/2017 06:27 PM, Jon Elson via cctalk wrote:
For 800 BPI I have most of this in my head, if you have any specific
questions. (I wrote up a mostly software read/write interface for 800
BPI NRZi mag tape many years ago on a CM/M
to my friend who used to work for them.
He used to have a Non-Stop I in his basement. He built it
from cast-off boards, some of them blank so he had to stuff
them with chips.
Jon
e. Any other VAX that has a media-compatible
floppy drive ought to be able to read it, also. You might
have to use the foreign option when mounting it.
Jon
MO for somewhat less than that.
FedEx and UPS have arrangements for boxes up to 170 LBS, I
think. There is a surcharge for overweight
boxes, but it isn't that bad. If palletized, you may need
to pay for a lift gate truck at the receiving end, or have
your own fork lift.
Jon
n for newly recorded
tapes. But, if you are using it only for recovery of old
data, maybe no downside at all.
But, there are so many defects in old tapes. There's
print-through, wrinkles from the tape pack scrunching,
weave, oxide flaking, dirt buildup, and maybe some others.
Jon
800 BPI.)
Jon
P-5 had another cabinet to the left, and
a desktop surface. We had DecTape drives on it, and a scope
output that was so slow as to be nearly useless.
Jon
t the console?
Jon
matic form, with VHDL code to provide the
same functionality. So, you can make up a schematic with
74xx TTL parts, and then it instantiates the VHDL behavioral
description of the part. One could easily extract the VHDL
from their library.
Jon
t the same time. I'm not sure the original
DEC PDP-10 (KA-10) used microcode, but the KI-10 did.
Jon
microprogramming. IBM was not the first company to build
machines using the technique. They did make microcode
mainstream technology with the 360, however.
Jon
ert between
decimal and binary addresses. So, memory locations 0-9 were
used, A-F were inaccessible, 10-19 were used, 1A-1F were
skipped, and so on. Some of this made I/O buffers kind of
strange, as the I/O buffers had to be repacked between the
real I/O devices and the emulator's buffers.
Jon
On 11/02/2017 07:37 PM, Fred Cisin via cctalk wrote:
giant kidney stone and massive infection. First few days
were intolerable levels of pain.
WOW! Sorry to hear about this, and hope the surgery gets
the stone out and you recover well and quickly!
Jon
oes anyone have an extra
assembly?
I'm pretty sure this is an AMP Mate-n-Lock connector. I
think they are still made.
DEC used a lot of them in various power supply/distribution
areas.
Jon
contacts with a little care.
The contacts are quite similar. You can even use needle
nose pliers, but you will end up mashing more than you crimp
properly. Then, you will need to solder them to get a good
connection.
Jon
.
I happened to be in the Los Angeles area late this spring,
and got to see them in that state.
They looked like giant purple snowballs.
Jon
On 11/08/2017 12:04 AM, jim stephens via cctalk wrote:
On 11/7/2017 7:53 PM, Jon Elson via cctalk wrote:
They looked like giant purple snowballs.
The droppings destroy the paint on your car, however.
Irvine is covered with them. There is another tree with a
red flower that has the
090.
See :
http://www.bitsavers.org/pdf/ibm/7090/
and
http://www.bitsavers.org/pdf/ibm/7094/
Yes, there is very little on the 709.
Jon
m not talking
about deciphering the schematics, this was the programming
guide for that model. I thought that was what you were
looking for.
Jon
registers. The
709x and their ilk had accumulators, multiplier/quotient
registers, index registers and all sorts of other things.
The 360 just had "registers"! I think a major reason for
this current was to make compiler writing simpler. But, it
made life easier for the assembly language programmer, as well.
Jon
) computer with about 32K of memory.
Hmmm? Not too many personal computers in 1968-73. There
was the LINC 12-bit mini that cost about $50K and was
designed for use by one person at a time. I built an 8008
machine in 1976 or so, and got a Z-80 S-100 system going in
about 1977.
Jon
etent at competing with IBM in the large systems market.
They were included in the BUNCH, however.
Jon
On 11/15/2017 01:13 PM, Chuck Guzis via cctalk wrote:
On 11/15/2017 10:17 AM, Jon Elson via cctalk wrote:
MANY companies were quite bad at making a go of the computer business.
Xerox is probably legendary, but GE and RCA were certainly also famous
for this. Honeywell made a LOT of computers
e personal level than the large-scale
mainframe machines housed in the glass-walled rooms where only "special"
people were allowed anywhere near them.
How about "small systems", able to be powered solely from a 115V/20A
source (or its 220V equivalent)?
PDP-5 and LINC certainly fit that requirement.
Jon
; consoles! Take a look at a photo!
Jon
On 11/15/2017 09:13 PM, Paul Berger via cctalk wrote:
On 2017-11-15 10:07 PM, Jon Elson via cctalk wrote:
On 11/15/2017 07:09 PM, Paul Koning via cctalk wrote:
Earlier, there was the SAGE computer (the air defense
one, not the PC by the same name), which had built-in
ash trays at each
On 11/15/2017 10:11 PM, Brian L. Stuart via cctalk wrote:
On Wed, 11/15/17, Jon Elson via cctalk wrote:
PDP-5 and LINC certainly fit that requirement.
Funny the LINC should come up tonight. Earlier this evening
I went to a talk given by Mary Allen Wilkes who was the
developer of the
if you just
want to see how others did it.
Jon
name for the
material it was made of (sort of like MDF), but 'light shield' is what I've
taken to calling it.
I have made very similar technology panels before. I used
black Plexiglas as the "light shield", and used an end mill
to plunge the holes through, rather than a drill. I think
that made cleaner holes.
Jon
been made since about 1974 or
so, and was absolutely HORRIBLE stuff then.
The thermal developer emitted nasty smells and filled the
whole unit with white crystals. The paper turned brown
after a few weeks exposure to room lights. So, good for
short-term copies only.
Jon
ested to know if this is the case.
As long as the PDP supports the 22-bit Q-bus, it should work
perfectly. The metal plate can be removed.
Jon
se old PDP-11-type devices on VAXes.
But, yes, if there's no driver to support the interface,
then it doesn't really matter if the device is electrically
compatible.
Jon
think Newark has EU branches as well. This housing is a
smaller version from the same series.
Jon
acks-wide IBM 3480 format. I think DEC's
drives were also serpentine. If they are really from an IBM
compatible system (really too late for 360, most likely 370
systems) then I think only an IBM-compatible drive would
read them. Wikipedia says the 3480 was introduced in 1984.
Jon
amage was done, just the bonding wire was blown like a fuse.
I made my own 2716-2764 programmer MANY years ago. On a few occasions I
put an EPROM in wrong and saw the bonding wires light up! I killed
power and corrected the mistake, and the EPROM worked fine.
Jon
r question, but a few
years ago I resurrected a pretty complex Turbo Pascal
program that I used to run on Win 95 and Win 2K.
I used Linux and the Free Pascal Compiler (FPC) and it did
an amazing job of correctly handling all the Borland
extensions (uses, unit, interface, $define, etc).
Jon
a bunch of wires in a shield DEFINITELY
causes visible artifacts on a mid-frequency VGA. A long
time ago I actually had to make my own VGA cables with HD15
connectors and RG-178 cable, because stock cables were total
crap!
Jon
Limited
XT clone. The error is
ARC Turbo Board
X Turbo System Error # 04
ARC make me think of ARCNET, a very old network system.
Unless you want to connect with other machines running
ARCNET, then this card would be of no use.
(I could be wildly off base.)
Jon
.)
Jon
x is hex output of 16-bit words, od -d does 16-bit words
as decimal, and so on.
Jon
heard of it. We did get it running on
VAX/VMS on a 11/780. The versions of TeX I have used
produce .dvi files, which can then be converted to .ps or .pdf.
Jon
stays
powered on. Then, you can try to determine which cap is
bad. It could also be a power supply issue. Maybe a dummy
load that lightly loads all the voltages would be good for
testing.
Jon
lizing" it through the LSI-11 console
computer so you could mount it just like any other device.
Jon
up, I think you are right! memory fades over 40 years!
Jon
ed in network support. You probably need something like that
if you're makng a 1m cable. But not for what the OP is trying to do.
I did make up an AUI cable out of 4 separate shielded twisted-pair cables.
Just tie-wrapped them together.
Jon
On 7/1/23 15:10, Sellam Abraham via cctalk wrote:
Don Lancaster passed away on June 7.
https://gilaherald.com/obituary-for-don-lancaster/
I hope his website is well preserved:
https://tinaja.com/
Wow, another legend! Yes, there is a lot of good stuff there.
Jon
e
with the MMU.
Jon
the rate I would use on the PDP11 and
finally convert the numbers into 12bit integers.
I think audacity will convert to any arbitrary sample rate.
I'm not sure if there's a way to set the bits/sample, but if
you turn the volume down you should be able to just truncate
the data.
Jon
, the timing of the head loading somehow was all
wrong and allowed it to start writing before the pad had
fully loaded.
Jon
Lisa.
WOW! Dave Ungar is a good friend of mine, I knew him from
Washington University (where I still work.)
Jon
xport support, and does just
about any kind of statistical or logical operations on
columns of data.
Jon
you go this route, make sure you get the probe cables and
pods with it, they have essentially attenuator probes in them.
Jon
through its insualtion and
shorted against another pin.
Well, the mice pee in everything, and that is very corrosive!
Jon
, and it was raining when
we tried to load out our stuff on Sunday afternoon.
Thanks for any comments on what is really going on!
Jon
limited I/O. But, pretty quickly I got a floppy drive
and controller and started running CP/M with some sort of
video terminal.
Jon
port - that might take a WHILE!
thanks,
Jon
type wheel when the right character passed by. It
printed at 30 chars/second. I looked for this model online
but didn't find anything.
Jon
ers that did. I did have a DEQNA (I
think) at one time but don't have it now! That would make
things a LOT easier.
Thanks,
Jon
have been using PCBWay for several years. Quality is
excellent, and for small orders, like 5 small boards, they
have a much lower cost delivery method through DHL. I don't
know where the breakpoint is on size or weight.
Jon
VAX cross-compiler for Pascal,
cross-asm and debugger. I had all of these at one time. I
still have the Pascal manual and maybe some other stuff, as
well as a bunch of the development boards. I'll be hauling
all of that to the VCF-MW this weekend.
Jon
question I contributed: "On what model and
under what circumstances will the PC increment by 1?"
The PDP-11 was introduced in 1970, so the 20th anniversary
would have been 1990, or 2000 would have been the 30th.
Jon
d normally
increment by 2, except where immediate operands are used.
Jon
On 9/7/23 09:35, Mike Katz via cctalk wrote:
What time is setup Tomorrow (Friday, 8-Sep-23) for VCFMW?
They sent out a message to vendors that it would be open 10
AM to 10 PM, a few people would stay during the pizza dinner
to allow latecomers to load their stuff.
Jon
e (my penmanship was never really
great) and typing is more error prone than before.
Jon
hat serves as a byte
clock. Making the Potter drive look like a Pertec drive
would be a fair bit of circuitry.
I assume the 727/729 series was similarly primitive, and
would need the same amount of logic to be used.
Jon
bent so badly they can't be
straightened. From 11/04 or 11/34. Free if you pay shipping.
Jon
On 10/20/23 11:46, Ethan Dicks via cctalk wrote:
On Fri, Oct 20, 2023 at 12:11 PM Jon Elson via cctalk
wrote:
On 10/20/23 03:59, Michael Thompson via cctalk wrote:
The RICM has an empty 11/20 chassis and the power supply. All it needs is
the processor backplanes. Is there any chance you have
are lots of other drives with 6250 capability.
The CDC Keystone 92185 could handle 6250 at full speed, and
was very reliable. There was a SCSI version available, but
the ones I had were Pertec formatted.
Jon
t to the glass. Some
people have reported success by placing foam tape to apply
pressure to the chip to apply a little pressure to the
connections when the case is closed.
Jon
an as
designed FIRST TIME! It made me construct the program
logically. Sorry to hear of Mr. Wirth's passing!
Jon
same purpose. We now use the Jtec XLM module, which
is an FPGA and memory set up to scan VME devices like ADCs,
and packetize the data to send out on a USB. So, at that
end, there is NO CPU.
Jon
On 1/30/24 11:09, Jon Elson via cctalk wrote:
On 1/29/24 22:07, Bill Degnan via cctalk wrote:
Anyone have a VMEbus system they use at least
occasionally? If so, what
make/model/config?
Oh, also my Samsung-made pick and place machine has a 68020
to run the motion system, and a PC that runs
ascal and DEC Pascal programs, and took the
separate compilation directives like uses and $I. I was
able to get that program running on a Linux system in a few
days.
Jon
reader that was designed for some kind of
cassette, but I never had the cassettes. But, it could be
used with open spools of tape.
Jon
On 2/27/24 08:58, erik--- via cctalk wrote:
Hi Jon!
think the Bendix G-15 had cassettes for the 5-level tape
they used.
Aha, interesting! Did a short search, but have not been able to
find a picture of a casette. Just a pile of paper tape instead ;-)
https://images.app.goo.gl
ansistors, etc. to replace any
bad modules.
Jon
that a guy I used to work for, who later hired on at
DEC, was on a cover of one of the DEC publications. Yes,
the photos were certainly stages shots, but at least one
person was not a hired model.
Jon
On 3/17/24 11:11, Jon Elson via cctalk wrote:
On 3/17/24 09:13, Bill Gunshannon via cctalk wrote:
I have often wondered about the people we find in the
various
DEC Processor (and other) books. Were they models in staged
photo-sessions or were these candid shots from DEC
facilities
and if
connections form a big loop to accept magnetic
coupling.
Jon
half a block away. It took out an ethernet port on one
computer, and blew out a bunch of stuff on a burglar alarm I
had built. Both involved long wire runs.
Jon
half of a 360 instruction set. But, it only had 4
registers.
Jon
p 16 KB of main storage, and 360 and other instruction
set emulations could be loaded from cards. The boot loader
for the emulators was in the top 16 bytes (or maybe words)
of main storage.
Jon
Virtualbox or VMware. The model 44 had no channels, there
was only direct I/O (a set of 32-bit parallel input and
output registers) and a pair of cartridge hard drives inside
the CPU cabinet. Think DEC RK05s.
Jon
On 4/10/24 11:19, Chuck Guzis via cctalk wrote:
On 4/10/24 08:17, Jon Elson via cctalk wrote:
The 360/20 had only halfword instructions, no float, no char strings.
But, main storage was 16 bits wide.
I'm not quite sure what you mean by "char strings", but SS instructions
MVC
about 1200 LPM, which was pretty fantastic for the time.
But, I am glad to not have to deal with these things anymore!
Jon
l key to tape system that
apparently was used as an off-line tape to line printer
unit. But, it was actually possible to use it as a key to
tape machine, too. I wanted it for the 300 LPM printer, but
had to use it in the tape to print mode to decipher the
protocol of the printer.
Jon
wafers. That's their business model.
Jon
On 4/19/24 21:07, Fred Cisin via cctalk wrote:
Gee! Have sales gone down?
One more reason to use the 8080 subset when writing CP/M
programs.
Aren't there already some licensed second sources?
Harris also made an all-CMOS plug-compatible Z-80. I used
it in a low-power project.
Jon
scope a signal, you could unplug a tri-lead
and connect it to a scope with a 91 Ohm terminator.
Jon
mmed PDP-11s and VAXes in assembly
language (Macro 11 and VAX Macro) I found the similarities
VERY strong. Just that the 32-bit architecture took the
constraints of the 16-bit PDP-11 away.
Jon
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