On 02/06/18 15:17, allison via cctech wrote:
>
> It was my understanding from using the 730 that there was limited
> (really limited) microcode
> enough to load the WCS as the tu58 was a serial device (standard tu58)
> and the 730 had to
> unpack and stuff the WCS.� You need little to do that but
> Ethan Dicks wrote:
>We used to purchase 11/725s for parts to keep our 11/730 running.
I remember when the 725 first came out. I was working for DEC at the time,
and up until then the only VAXes I'd ever seen were 780s. Somebody rolled this
little end table sized thing into the lab and
Can anyone point me to a technical manual for the DataMedia Elite 2500A
terminal? I'm especially interested in documentation on the escape
sequences and the special character sets. This was a fairly high end smart
terminal from the late 70s or early 80s.
Bitsavers has a short manual for
I'm looking for manual scans, software, really any documentation of any
kind for the Fairchild F9440 or 9445 (aka the MicroFlame) microprocessors.
Yes, bitsavers and a few other places have datasheets for the chips, but
that's really about all the documentation I've found. And yes, I know that
>Eric Smith wrote:
>The control stores of the 11/785, 8600, and 8650 were entirely WCS.
>
>All other VAXen had (relatively) large ROM control store and tiny WCS or
>patch store.
You forgot the 11/730 and 725. The KA730 used 2901 bit slicers and the
control store was entirely in RAM. After
I too have heard that RC25s and PDP-11s were used in nuclear subs for some
kind of sonar thingie. I've no idea how that worked, except that maybe DEC
gave all the good drives to the Navy and the rest of us got the crappy ones.
They worked as long as you didn't spin them down or try to
>Eric Smith wrote:
>There's SDI protocol documentation?
You know, after I wrote that I realized that I was wrong about SDI. I've
seen some electrical specs, but not the protocol.
Bob
>You might look up Nick Tredennick's book "Microprocessor Logic Design:
>The Flowchart Method" which is sold at Amazon for an obscene price
FWIW, there are several copies on Abe Books ranging in price from "only" $800
(a steal!) to almost $1200.
I'd love to read it, but that's ludicrous.
Does anyone know offhand if the CXY08 (M3119) and DELQA (M7516) work with
2.11bsd?
I think the CXY08 has the same programmer interface as the DHV11, and I'm
hoping it works with the 2.11bsd dh driver. Ditto for the DELQA and the qe
driver. If somebody knows for sure, though, I'd
> Josh Dersch dersc...@gmail.com wrote:
>Correction: it's the "qt" driver for the DELQA.
FWIW, looks like the CXY08 in DHV mode works find with 2.11bsd.
The qt driver, however only works if you have the very late model DELQA that
has "turbo" mode. I think that was called the DETQA, but
On 7/3/19 6:39 AM, John Many Jars via cctalk wrote:
> Say, can anyone tell me which version of the kernel was the last one to
> work with Decnet?
Version 4.4.x kernels (Ubuntu 16.04.x) and maybe later can be made to work
with some tweaking. See http://rullf2.xs4all.nl/decnet/
Bob
On 7/17/19 6:12 PM, Al Kossow via cctalk wrote:
> I'm not even aware of any surviving Century software
That was to be my next question. I'd write my own simulator if I had
something to run on it.
A Century 50 and a DECSYSTEM-10 are tied for the first computer I ever got to
use, sometime
Is anyone aware of a simulator for the NCR Century series computers?
And no, simh doesn't do them.
Thanks,
Bob Armstrong
>Paul Koning wrote:
>...
>ACM has currently opened up all of its digital archives during these
pandemic times
This is great - thanks for passing along the information!
Now, if the IEEE would just do the same thing...
Bob
Does anybody have a maintenance print or service manual for the DEC H7874?
This is the power supply used in the BA4xx and R400x cabinets. As you might
guess, I have one that tries to power up but shuts down after a second.
Probably a bad capacitor (or several), but this thing is ridiculously
> Jon Elson wrote:
>The VAX 11/780 absolutely had power fail, and it DID work.
So did the 11/730 and I imagine the 750 as well. No core, but there was a
battery backup option to keep main memory alive and refreshed even in the
event of power failure.
>I did this quite often while swapping
> Rob Jarratt >robert.jarr...@ntlworld.com> wrote:
> I reverse engineered the schematic of the 12V output board. I
>don't know if that would be of any use? How correct it is I don't know.
Sure, if you don't mind sharing. Everything helps.
Looks like there are five separate PCBs in there.
>Maciej W. Rozycki wrote:
>numerous Chemi-Con SXF parts scattered across
>all boards, some leaking
Yeah, mine is full of "Nippon Chemi-Con" electrolytic too.
What about just gutting the PS chassis and sticking in an ATX power supply?
I don't know how the maximum current per output
Remembering that I have the R400x enclosure and I'm only interested in
powering disk drives - I looked up the specs for the RF7x drives, and they all
use about 1.5A at 5V and 2.5-3A operating at 12V. There's a 5-6A spinup surge
on the 12V supply, but as long as you spin them up in sequence
>Looks like for this enclosure an ATX supply could well work.
> For my VAX my notes say it didn't.
A VAX would certainly be harder. You'd have to kludge up the ACOK and DCOK
signals for one thing, which I don't think the R400x uses. It'd be really
handy to find even a schematic for the
I have a DS20E Alpha machine. It's pretty fully configured, with two 666
MHz CPUs, 4GB RAM and 4x10K SCSI drives. In other words, it's a real power
hog. It has three power supply modules installed, and if I understand the
configuration rules then at least two should be required to run the
I have an 11/04 with an RK11-D. I have a couple of RK05s, but I
wanted to test the controller before I start working on the drives. The
PDP11 Diagnostic Handbook says that ZRKJ?? "checks only the
drive-independent logic of the RK11 controller. no drive is needed..."
I assumed that meant
Is there a schematic for the H7441 regulator anywhere? There are several
out there for the H744 but, although they are plug compatible, the H7441 is
totally different. The H744 uses an LM723, but in the 7441 DEC appears to
have rolled their own regulator using a bunch discrete parts and
It appears that my RK8E has a problem - it fails the diskless control test
with
.R DHRKAE.DG
SR=
COMMAND REGISTER ERROR
PC:1160 GD: CM:0001
DHRKAE FAILED PC:6726 AC: MQ: FL:
WAITING
Ok, maybe a bad bit in the command
>Josh Dersch
> one half-height (used upside down).
Thanks, Josh - I hadn’t thought about using an extender card "backwards".
That's a good idea. Next question is "how many extender cards do I have?"...
Better go start digging.
In the meantime I did some more fooling around with
>Eric Smith wrote:
>DEC MK11-B Field Maintenance Print Set, October 1977
Thanks, Eric! I was just about to post that I discovered it's also in the
PDP-11/04 maintenance print on Bitsavers, although it's not in the 11/34 print
- go figure...
I didn't actually need the schematic, although
> Jon Elson
>And, our one remaining place in St. Louis, Gateway Electronics has also closed
>recently.
No - say it's not true!! I live in California but occasionally we drive
cross country to visit my family in Indiana, and I always stopped there. We
were last there in 2019...
Bob
Hopefully this is an easy question - are the sources for the XXDP
diagnostics online anywhere? I particularly looking for NKXA, the
Falcon-11/KXT11/DCT11 one.
Thanks,
Bob
I have an 11/03 (unmapped, of course) with 28kW memory and two DLV11s.
I'm trying to build an XXDP image on TU58 that I can boot on this system,
using an XXDP 2.5 RL02 image and simh.
My simh configuration is -
CPU 11/03, NOEIS, NOFIS, BEVENT disabled, autoconfiguration enabled,
I've discovered that three of my four RA8x drives (one 82 and two 81s) now
refuse to spin up. All the failing drives give "SPIN ERROR" as the reason
and I've discovered, by an combination of educated guessing and parts
swapping with the working drive, that all three have bad optical sensors for
>Bill Degnan mbilldeg...@gmail.com> wrote:
>Is there a 3D print gcode for the hardware that connects a PDP8a front
>panel to the chassis?
Assuming you're talking about the KC8-A (the panel with the push buttons and
7 segment displays) then I think there were at least two versions. The older
>Tony Duell
>Is that the 3U (5.25" high) one?
Yes..
>If so, there's a metal sleeve that is screwed in the rack.
Oh yeah, that would make sense. There was a QBUS chassis that worked the
same way. Was that a BA11-N? I forget - too many years have gone by :)
Bob
> Tony Duell
>I wonder if that's because on the 11/04 and 11/34 the boards go in
>from the top of the box whereas on the 8/a the boards go in from the
>front. Therefore you have to remove the frontpanel to insert/remove
>boards on the 8/a but you don't on the 11's. The 11's panel is rarely
> Bill Degnan wrote:
>Multinet
Are you suggesting running Multinet on VMS so it can talk to the TCP world?
Umm... The problem is that there are a lot more DECnet systems than just VMS.
Bob
>Grant Taylor
>Okay. I hadn't considered other DEC OSs that don't support TCP/IP.
AFAIK, VMS was the only DEC operating system (well, excepting the Un*x
derivatives) that supported TCP/IP. There were several third party TCP/IP
implementations for VMS (e.g. Wollongong, CMU, Process
> Grant Taylor wrote:
>Isn't Tru64 a DEC product?
I did say, "Excepting the Un*x derivatives"...
>Would you stop using DECnet b/c it was removed from the kernel?
Well, I wouldn't be able to upgrade that machine anymore. That wouldn’t be
the end of the world, but eventually one of two
I have three DEC RA8x drives that have failed (all of them fault with
"spin error") because of bad photo-interrupter tachometer sensors. After
talking to a few friends, it sounds like this is a pretty common fault.
Photo sensors like this are fairly common, even today, but the specific
parts
>Paul Koning wrote:
>Does the tachometer have to be accurate, or does it just have to indicate
> "spinning fast enough" to satisfy the spin-up logic?
It's not just spin up - the firmware monitors the disk speed all the time
it's running.
But AFAIK the tachometer has nothing to do with how
A friend gave me a DEC VK100 (aka GiGi) recently. It's in really nice
shape, but it is missing the power supply. Before I try to kludge something
up with an ATX supply, I thought I'd ask if anybody knows where I might find
an official replacement.
Thanks,
Bob
On Mon, 2023-07-10 at 21:32 -0500, Jay Jaeger via cctalk wrote:
> Over the past couple of months I have been working on my FPGA
> implementation of the IBM 1410 ...
What are your plans for implementing I/O? Are you going to emulate a card
reader and line printer using an SD card and a FAT
Does anybody have the maintenance prints for the DEC VT180?The VT180,
aka "Robin" was DEC's CP/M machine in a VT100 chassis. The terminal part is
just a standard VT100 and maintenance prints for that are easy to find, but
I need a schematic for the actual Z80 CP/M Robin option card. Can't
>Rob Jarratt wrote:
>Have you checked here: http://9track.net/roms/ ...
Hey, thank you! I didn't know about this particular collection, and he does
have the ROM dumps for the VT180 Z80 board.
I'd still like to find a schematic, though!
Thanks again,
Bob
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