hey very slowly migrate back to the aquadag, producing a
substantial voltage. I remember seeing this demonstrated on an
electronics course several decades ago. Which is where I /should/ have
learned about discharging CRTs *through a suitable resistor* :-)
--
Pete
Pete Turnbull
/
--
Pete
Pete Turnbull
in my original post.
--
Pete
Pete Turnbull
to ’68 or ’69, so I’m inclined to treat it gently. Any suggestions for
approaches to clean this up?
I've used the dishwasher on a collection of PDP-8/E boards with success.
Avoid the hot drying cycle, and don't use a harsh dishwasher
detergent; some are quite caustic.
--
Pete
Pete Turnbull
+ KB/Mouse, happy to repair it.
Also Sinclair +3 with some disks
Also BBC Micro
Also Amstrad CPC 6128 color. Could forgo monitor and build my own PSU.
--
Pete
Pete Turnbull
that domain, but
now it looks like it might be going away and I've had no luck with their
tech support. Again. Sigh. The data will be preserved and re-homed,
maybe even expanded, but I don't know if the domain name will need to
change.
--
Pete
Pete Turnbull
ve an Indy running 24/7, providing various services on my
network. It has 24-bit graphics and a 100baseT Ethernet interface, but
it's not much used other than as a server these days. Not the most
efficient but somehow it's always seemed like more trouble to migrate
things.
--
Pete
Pete Turnbull
https://www.computermuseum.org.uk/
--
Pete
Pete Turnbull
he
diskette was flipped over.
It's my experience that the index hole is used, and does matter, on
pretty much all 5.25" systems except Apple ][s.
--
Pete
Pete Turnbull
wer supply, likely for an
M2284 SMD drive. Probably went in the empty slot you mention below.
Yep. Looks identical to the Fujitsu PSU in my 11/40 rack, and the rails
are the same as my Fujitsu rails.
--
Pete
Pete Turnbull
) DCL
was explicitly modeled on VMS DCL
RSX originally used MCR, but later (from about 3.2 IIRC) had DCL as an
option, and that's where VMS DCL came from.
--
Pete
Pete Turnbull
On 21/09/2021 20:34, Chris Zach via cctalk wrote:
Can an MXV11 be used in a 22 bit system? I thought it was an 18 bit
device?
MXV11-B is 22-bit. MXV11-A is 18-bit but supposedly can be used in a
22-bit system if the RAM is disabled.
--
Pete
Pete Turnbull
s, or if i could
SLIP/PPP serial to another machine,so i could telnet in as well as use dumb
terminals.
7th Edition has no Ethernet/TCP/IP capability. BSD 2.11 does.
--
Pete
Pete Turnbull
STL files
unless you're careful.
If you want some help, you know I'm not very far away. I can certainly
I can test STL files out for you, and possibly even print some,
depending on what they are.
--
Pete
Pete Turnbull
On 10/05/2021 23:31, Adrian Graham via cctalk wrote:
Just me that reaches for a 2mm drill then?
Probably. I usually use 3mm or 1/8".
I've taken more than one Apple PSU apart that way, long ago.
--
Pete
Pete Turnbull
s ago, eBay had
a "test" category, for "items not for sale" or some such description.
Anyone remember the "air guitar" that sold for something like $500?
--
Pete
Pete Turnbull
ly it went off the air. It turned out the electricity
provider had (accidentally) tripped the wrong breaker in the local
substation. Grr.
--
Pete Turnbull
--
Pete
Pete Turnbull
ounce. In fact
it's defined (or was) as the volume of water that weighs one ounce.
--
Pete
Pete Turnbull
flour. I worked with the Estates' asbestos team at a university and we
found that a lot of Bakelite does not contain any asbestos. The trouble
is, you can't tell without proper analysis.
--
Pete
Pete Turnbull
.
--
Pete
Pete Turnbull
, is to
use a cheap 3D printing pen with the sample ABS or even PLA filament
they usually come with.
Lurid colours are optional with this technique ;-)
--
Pete
Pete Turnbull
ard SA800-style drives, not an RX02. I
also have a Baydel F311 controller, which also can format disks and
connects to standard SA800-style drives, but it only does single density.
--
Pete
Pete Turnbull
s or even SRBP with copper tracks, maybe
you can get at the tracks to the 'h' etc keys and cut them with a
scalpel or craft knife to isolate them to see where the resistance
really is. Before cutting anything, obviously make sure you can get a
soldering iron in there afterwards to bridge the cuts.
--
Pete
Pete Turnbull
the 1990s, and I still have at least a couple of 1275 modems.
The idea was to use 1200 for the transmission from central computer to
consumer, and the back channel for user responses/commands. Not many
people type faster than 7.5cps.
--
Pete
Pete Turnbull
On 18/06/2020 23:03, Eric Korpela via cctalk wrote:
I used to use netcat, but now I just watch an oscilloscope.
Reminds me of a cartoon in a HiFi mag several years ago. Enthusiast
talking to friend in front of dual 'scopes, "Why listen to it when I can
see it's perfect?&
ogical place to look. Nevertheless, it was almost 40% cheaper to
buy the part from Digikey, including UPS shipping from Texas to my
address in the the UK, where it arrived in 36 hours.
--
Pete
Pete Turnbull
) Mate-N-LOK series.
But, I have some 3.25" drives that use same connectors as "standard"
3.5" drives, ("4 pin Berg"?) EXCEPT 5V and 12V are swapped in their
positions in the coneectors!
Not Berg, not even the same pitch. They're AMP Economy Interconnect
connectors, with a 2.50mm pitch.
--
Pete
Pete Turnbull
and
CD in part and Q22 on the rest, but the rows with CD are the top rows.
http://www.dunnington.info/public/PDP-11/QBus_chassis
--
Pete
Pete Turnbull
On 06/04/2020 00:22, Jon Elson wrote:
On 04/05/2020 03:32 PM, Pete Turnbull via cctalk wrote:
A few hours ago I started looking at three "smart" light switches that
need LEDs replaced, and switched on the soldering iron, and ... nope.
It's a Weller WP80 and it seems the sensor
gth of
thermocouple wire inside it. I could buy a whole new solder station
with more bells and whistles, albeit of a "lesser brand", for less.
--
Pete
Pete Turnbull
he bank of drawers and several other items for £100.
--
Pete
Pete Turnbull
IT department of a large university and it caused a lot of
confusion back in the day when they were common, when people expected
them to convert any keyboard or mouse to PS/2, and found they didn't.
They only work with devices that inherently support both protocols.
--
Pete
Pete Turnbull
hip between the connectors and the signals
a bit better.
--
Pete
Pete Turnbull
the lowest bank.
--
Pete
Pete Turnbull
and if it's not indexed
then it would take a while to find, but that's where I first saw it.
I'm pretty sure it's documented elsewhere too.
--
Pete
Pete Turnbull
icating your fan bearings or bicycle chain with
it and see how much it shortens the life, as it washes out the proper
lubricant, as it's supposed to do.
--
Pete
Pete Turnbull
On 27/06/2019 07:53, Dave Wade wrote:
Pete,
Am I right in thinking Jim has no scanning facilities, and access is still
one weekend in two.
Pretty much.
--
Pete
Pete Turnbull
On 26/06/2019 22:52, Al Kossow via cctalk wrote:
On 6/26/19 1:00 PM, Dave Wade wrote:
Could we forward to the UK DecTech list?
Let's see if Pete Turnbull is able to make contact
I have, but I've not yet made any arrangement to collect it all. It
could be postponed until late J
y I have a mass
of RSTS related documentation, such as one copy of every edition of the US
publication RSTS Porfessional magazine. Plus
copies of RSTS and RT-11 operating system manuals, from RSTS Version 4a (1974)
through to Version 10.1 (mid 1990s)."
--
Pete
Pete Turnbull
ones. I don't really care what you or Grant call it yourself, but at
best the term is confusing, given it can mean at least two other things,
and it's certainly not any sort of canonical name as has been suggested.
--
Pete
Pete Turnbull
bility. That's not what Charles described, and what
you referred to, which is a network bridge.
--
Pete
Pete Turnbull
ers.org/pdf/dec/disc/uda50/
and at
http://www.dunnington.info/public/MSCP/
--
Pete
Pete Turnbull
1994.
See the files at http://www.dunnington.info/public/RQDX/ and
particularly http://www.dunnington.info/public/RQDX/DUX.TXT if you're
interested.
--
Pete
Pete Turnbull
CD's.
Generally it has a .iso extension but as the content is not ISO9660 you can't
mount it on Windows or Linux.
Indeed, and the same is true of IRIX install CDs, which have an EFS
filesystem.
--
Pete
Pete Turnbull
On 04/05/2019 02:54, Al Kossow via cctalk wrote:
On 5/3/19 3:22 PM, Pete Turnbull via cctalk wrote:
Anyone know much about early MIPS workstations?
RISCos 4.52 src, incl monitor src up now under
http://bitsavers.org/bits/MIPS/RISCos
Once I can get the machine to stop wailing, that will be
On 04/05/2019 01:54, Al Kossow via cctalk wrote:
I see we all were talking about the M2030 around 3 years ago
http://www.classiccmp.org/pipermail/cctech/2016-May/017829.html
Some useful information in there, but I have the original MIPS keyboard
and mouse.
--
Pete
Pete Turnbull
at the error is to do with bad RAM.
--
Pete
Pete Turnbull
-pin SIMMs that somebody has done a
rubbish job of soldering short stiff wires onto.
So I'd like to know what the RAM spec really is, whether I need to
reprogram the Dallas chip (and if so what goes where), and what the
diagnostic numbers on the internal LED mean. Anyone?
--
Pete
Pete Turnbull
of them as "new old stock" for
about half price. They're relatively inexpensive and absolutely
invaluable. Put a 200lb unit into the top of a full height rack? No
problem. Shame I had to leave both behind when I left that employment
(especially since they bought a third one but
It doesn't gain an
awful lot, but I changed the crystal, just because I could.
--
Pete
Pete Turnbull
roPDP-11/73 and the later, cheaper, cut-down 11/53
were as well. But almost all the 11/83 systems I've ever seen were in
BA123 boxes, though they did sell some in BA23 pedestals - I've got one.
--
Pete
Pete Turnbull
esn't work.
Absolutely not so - there were very many microPDP-11/83 systems sold in
BA123 cabinets, in fact probably more in BA123 than in BA23. The
MicroPDP-11 System Maintenance Manual features the BA123 heavily
throughout, as do other microPDP-11 manuals.
--
Pete
Pete Turnbull
icroPDP-11/83 machines in
BA123 cabinets, it was a very popular option because of the space for
storage devices and the extra backplane slots.
--
Pete
Pete Turnbull
ake a list of what you're using and
check through the relevant Micronotes about compatibility.
BTW, BA23 and BA123 microPDP-11 backplanes aren't the same - it's the
first 4 slots that differ in a BA123, and slot 13 is different again.
Take a look at http://www.dunnington.info/p
xt on a related machine for his
access control.
He no longer works for the enterprise in question.
--
Pete
Pete Turnbull
On 08/12/2018 09:55, Rod G8DGR via cctalk wrote:
Nice try Josh - close – you have to change the crystal first and you can’t get
them.
Both Farnell and Mouser UK have suitable crystals. They don't have to
be the same physical size. I've changed several.
--
Pete
Pete Turnbull
t the serial card in the PDP-8/E to
something faster anyway? Although on one of the serial cards, that
requires a crystal change, so though commonly done, may not be practical
for Rod.
--
Pete
Pete Turnbull
PDP-8/E doesn't have a CTS pin and the loaders don't support XON/XOFF,
though.
--
Pete
Pete Turnbull
;-)
TTFN - Guy
On Dec 7, 2018, at 4:57 AM, Pete Turnbull via cctalk <
cctalk@classiccmp.org> wrote:
On 07/12/2018 09:59, Rod G8DGR via cctalk wrote:
OK now I need a little help.
Does anybody know of a terminal emulation program that will simulate
the reader on an ASR33?
I know abou
, there's send and rsend, and several other
utilities, that you can find at Kevin McQuiggin's web page:
http://highgate.comm.sfu.ca/pdp8/
and on mine:
http://www.dunnington.info/public/PDP-8/
--
Pete
Pete Turnbull
or me it's not really a workstation.
That's simply not true. The first Sun 1 was actually designed as a CAD
system, and did indeed have graphics. *Does* have graphics, I should
say, as I've seen it.
--
Pete
Pete Turnbull
be the
'first' model.
Particularly since I know someone, not far from here, who has a Sun 1.
--
Pete
Pete Turnbull
umflex when I change the coding in my
client.
--
Pete
Pete Turnbull
u might be right, my v3 & v4 sets went up to Paul Allen’s museum, I kept the
v5.x set.
V3 was definitely dark blue.
Interesting. My sets of RT-11 V4.0 are all dark blue. The only V3 I've
seen is light blue.
--
Pete
Pete Turnbull
ply
knows to only use the bottom 256K for DMA I/O.
--
Pete
Pete Turnbull
2564B Side 2
Has anyone come across that one before?
No, not seen one of those. Not sure I want to, either: I like to keep
the skin on my knuckles ;-)
--
Pete
Pete Turnbull
system up with both drives installed, booting from the 6.5.16 drive, and
running fsck over the (unmounted) 6.5.22 drive. If that doesn't work,
you could probably still create a selections file from the unbootable
drive which you could use in the worst case of having to re-install.
--
Pete
Pete Turnbull
On 02/07/2018 14:17, Bill Gunshannon via cctalk wrote:
On 07/02/2018 08:34 AM, Pete Turnbull via cctalk wrote:
Bill would want the -JD (2MB) version
(the -JE version is 4MB so too big).
Or a pair of the 1 meg ore did they go away before the 11/93 came out?
My oopsie; the MSV11-J is either
n 11/84, while the -JE and JD
versions support everything. Bill would want the -JD (2MB) version (the
-JE version is 4MB so too big).
--
Pete
Pete Turnbull
/83), it would normally
only use its on-board memory. It does work with PMI memory, but might
it not be easier to just add the extra ICs on the CPU board?
--
Pete
Pete Turnbull
n the baud rate and cable quality used.
--
Pete
Pete Turnbull
On 16 May 2018, at 08:37, Josh Dersch via cctalk wrote:
>I was fortunate enough to acquire a TU56 this week, along with a TD8E
>controller. However, the TU56 lacks the G888 flip-chips necessary to work
>with the TD8E; I know these parts are in short supply, but in the unlikely
>event that any
he x86 architecture.
I think you are confused maybe. Wasn't it sadism?
Never attribute to malice that which is adequately explained by stupidity.
--
Pete
Pete Turnbull
On 26/03/2018 17:07, Pete Turnbull via cctalk wrote:
Except it's not a zener, or at least not anything like those [ones
Camiel and Bob suggested]. I took one out of another (working)
supply, and I can tell it has a forward voltage of 0.2V, so it's
presumably a Schottky diode of som
PDP-8/L, except that an 8/L
doesn't weigh 80lb and the panel would be yellow passivated zinc-plated
rather than silvery.
So I guess that's not much help ;-)
--
Pete
Pete Turnbull
est problem
in photomicroscopy seems to be the spectrum, which isn't really an issue
for monochrome microfiche.
--
Pete
Pete Turnbull
d :-)
--
Pete
Pete Turnbull
y" (six volumes), but second is
either M.J.Langford's 3-volume "Photography" set, mainly because I got
it for college, or the "Ilford Photography Manual".
--
Pete
Pete Turnbull
it would take a while as the components are fairly densely packed, and
I've got several other tasks on the agenda.
--
Pete
Pete Turnbull
of
multi-megohm resistors to try and estimate the breakdown voltage - and
then guess at the forward current rating.
On 3/24/18, 9:47 PM, "cctech on behalf of Pete Turnbull via cctech"
wrote:
After a recent power cut and a series of glitches as the power was
restored
knows what family
or type/value this is, I'd be grateful for any insight.
--
Pete
Pete Turnbull
h red LEDs back in the day, I've kept the original red ones.
--
Pete
Pete Turnbull
s nearby.
--
Pete
Pete Turnbull
he marks are every 2.5m (8.2 feet) wich IIRC
is 1/19th of a wavelength apart, the point being to try to minimise the
likelihood of connections being made where they'd suffer constructive
(additive) interference and to prevent transceivers being too close
together.
--
Pete
Pete Turnbull
r says between 1.65mm and 1.70mm, the variation
probably being due to the paint. For our American listeners, that's
16SWG (not AWG!).
--
Pete
Pete Turnbull
On 07/01/2018 01:44, Chuck Guzis via cctalk wrote:
On 01/06/2018 04:54 PM, Pete Turnbull via cctalk wrote:
No, as would be obvious to anyone looking carefully at the photo (or the
real thing!), it's 1/4" x 20 UNC. I really must learn to think before
putting finger to keyboard.
Sigh. Third time lucky.
On 06/01/2018 16:11, Pete Turnbull via cctalk wrote:
Correction - it's 10-32. I found one of the screws, photo at
http://www.dunnington.cx/DEC/H960/kickplate/IMG_1006.JPG
No, as would be obvious to anyone looking carefully at the photo (or the
real thing!), i
On 06/01/2018 15:45, Pete Turnbull via cctalk wrote:
On 06/01/2018 12:04, Steve Malikoff via cctalk wrote:
Using the measurements provided by Vince I've rejigged the drawing a
bit and it ought to be closer.
Looks good to me except...
I had thought the hole in the front corner of the H96
MG_1002.JPG
http://www.dunnington.cx/DEC/H960/kickplate/IMG_1003.JPG
and a hastily drawn sketch of the dimensions at
http://www.dunnington.cx/DEC/H960/kickplate/kickplate.pdf
(NB This is a sketch, not a technical drawing, and is only approximately
to scale).
--
Pete
Pete Turnbull
nload them with something that does
not insert spurious carriage returns etc.
--
Pete
Pete Turnbull
completely different switch-mode PSU.
--
Pete
Pete Turnbull
sed Western Digital drives, amongst others.
http://chrisacorns.computinghistory.org.uk/Software.html#W
So there's clear proof that at least three companies in the UK were
using the term IDE before (or at least by) 1990. I never heard it
called anything else in that timeframe.
-Original Me
amongst developers, by then. By 1989 there were
more people using "IDE" - by that name - than anything else in the
markets I was involved in.
--
Pete
Pete Turnbull
nt solder paste, as sold in a small syringe, and the
matching liquid flux. Be sparing with the paste and generous with the flux.
--
Pete
Pete Turnbull
On 30/08/2017 17:02, Douglas Taylor via cctalk wrote:
On 8/30/2017 5:53 AM, Pete Turnbull via cctech wrote:
Hope this helps...
Yes, it does help. There are 3 issues that I am trying to resolve:
1. Running in 32kb of memory. If I use the 32kb MXV11 can I run RT11
V5.3?
If it works in
he UK) measured ours at over 255V on more than one occasion :-(
--
Pete
Pete Turnbull
al heating :-)
--
Pete
Pete Turnbull
d. The -DC has 32KB to
supplement your MXV11-AC; the -DD has 64KB. The -EC and ED versions are
the same boards but with parity circuitry added, which makes them less
common and more expensive, but they'd also do what you want.
Hope this helps...
--
Pete
Pete Turnbull
On 19/08/2017 00:46, Adrian Graham via cctalk wrote:
It doesn’t beat a listing from 15 or so years ago from a mate of mine who
advertised a polo mint (lifesavers to our US types) in a clear case as ‘mint in
box (mint, in box)'
Who remembers the sale of the air guitar?
--
Pete
Pete Turnbull
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