I have a question for the PDP-11 Unibus experts here.
I recently obtained a PDP 11/35 that had been dismantled
some years ago. As part of this, there were some older
style core memory board sets. These were the 8k H214
and H215 core boards and their corresponding G110 and
G231 boards. The backplane in the CPU box next to
the CPU backplane is an MF11-LP. There are three
other MM11-UP backplanes that supposedly came out of
a big BA11 expansion box. I also have the original
large field print sets for the MM11-L and MM11-S
memory, which both seem to go along with the
H214/H215/G110/G231 board sets.
Question:
Does anyone know if the older 8k H214/H215/G110/G231
memory board sets will work in the backplanes that
I have? The previous owner says that this memory went
with the backplanes that I have. I have acquired some
16k H217c, G214, and G235 memory board sets, along
with the M8293 and M7259 boards, so I can get more core
in the same space, but I would like to use the 8k core
too, if it can be used with the backplanes I have.
Thanks,
Ashley
>>> Here is something I dont understand.
>>> .45 is about 11,5 mm, while 7.62 is uuuuhhh 7.62 mm.
>>> How can the .45 come out worst?
>>> Nico (sniper in Danish National guard)
>>>
The .45 runs Windows
The 7.62 runs Linux
[or maybe it has something to do with velocity....]
David [ Major eater of Danish Pastries in the US]
hello
i have an old tek 1230 but without pods ! funny
i was searching the internet for pods as i saw that you are searching too.
Maybe did you found a reseller, or maybe do you have a tip or
explanation on
how it works to give to me.
Thanks
--
Patrice ULRICH
EOST - Institut Physique du Globe de Strasbourg
Laboratoire Proche Surface (UMR 7516 CNRS-ULP)
5, rue Ren? Descartes
F-67084 STRASBOURG Cedex
FAX 03 90 24 01 25
Email : patrice.ulrich(a)eost.u-strasbg.fr
As is traditional, the vagaries of the universe conspired to take down my
web server right after I released the latest issue of the VCF Gazette.
It's funny how you'll be up all night working on something major, and you
think, "I should back this up." But then you're so tired you decide to do
it in the morning. Then the next day your server goes down and you have
no idea why. Ugh.
Anyway, in this case it turned out to be a case of the server wanting to
have fsck run manually and so it never rebooted after some power glitch.
Fortunately, nothing was too out of whack: a few lost inodes and some
confused chains and other nonsense. I've now moved my server back to
within my own confines and have backed it up, plus I'm finishing up on a
new (faster!) web server, which will eventually have a lot of storage and
I hope to mirror some of the fine repositories on the web.
Anyway, if you tried to contact me since Tuesday and I have not responded,
this is why. I will be catching up and replying by later today.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
I've got a few (meaning, one or two) old floppies of mine that
I found, and hope are still readable, one with the sole copy
I know of of an 8086 ROM monitor debugger I used to bring up
a lot of machines with.
It's stored on a 360K 9-sector/track standard-formatted MSDOS
diskette with the right fatID and all that, but it does NOT
contain the IBM formatted crap in the boot sector that many
PCDOS implementations require.
Meaning, it will read fine (assuming it's still good) on MSDOS
but probably not PCDOS. (On PCDOS diskettes like this generate
something like "unformatted" error, Retry Ignore Abort.)
If anyone with such a capability could slurp off the source
(text) files and simply email them to me, and toss the original
media, I'd appreciate it. I'm in Los Angeles, but anywhere in
North America would be cheap postage.
I forwarded Joe's request for info on the TWX Diag Control Panel from the
ClassicCmp (cctech) list to the Greenkeys email list. Both Joe and I got a
private reply but I feel some others on both lists will be interested in
Russ' reply. To wit:
>From: Russmill47(a)aol.com
>Date: Mon, 4 Oct 2004 12:37:40 EDT
>Subject: Western Union TWX V Diagnostic Control Panel
>To: cfandt(a)netsync.net
>Cc: rigdonj(a)cfl.rr.com
>
>
>When Western Union acquired the TWX network from AT&T, there was a need to
>build a new network that would allow Western Union to integrate the
>existing Telex network with the TWX network.
>
>Western Union designed and built the Digital Exchange Network (DES) for
>this purpose. DES was not the huge success that everyone hoped as there
>were many software problems that caused reliability and availability problems.
>
>The TWX V Concentrator was located at the edge of the WU Central Office
>network, usually within a couple of thousand cable feet from the serving
>Local Exchange (Bell) Central Office.
>Typically, these concentrators would handle up to fifty (50) TWX
>customers, handling all the edge interaction with the customer TWX machine
>on one side of the box with the rest of the box providing TDM services
>that consolidated the 50 customer signals into a single digital data
>stream. In small locations, which could be rental space in a telephone
>answering service location, there would be a single box. Medium size
>locations would have multiple boxes that would feed their digital signals
>to an intermediate box that would further Mux these separate digital data
>streams to a high speed (9600 bps) Paradyne Modem.
>
>The Diagnostic Control Panel was mounted at the top of the concentrator
>and was used to monitor the internal health of the box as well as provide
>information as to the status of the individual subscriber links and the
>high speed digital data link. The technology is state-of-the art early
>1970s so you can look to processor speeds of 1-2MBps. A lot of this
>technology was designed and manufactured in Mahwah, NJ. This was the R&D
>headquarters for WU and just up the road from WU galactic headquarters in
>Upper Saddle River, NJ.
>
>Russ Miller
><mailto:russmill47@aol.com>russmill47(a)aol.com
>WA3FRP
So it appears the DES was one of the early implementations of commercial
digital communication.
Thanks for the enlightenment Russ!
Regards, Chris F.
NNNN
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt(a)netsync.net
Member of Antique Wireless Association
URL: http://www.antiquewireless.org/
> I don't know much about PET's but I guess "working"
>means it beeps 4 times. That is working, isn't it?
I'm not the most knowlegable about PETs in this group,
but I have been working on a bunch of them lately - I've
recently debugged startup problems with a 4032 and several
8032s (essentually the same board), so I will try and
offer somewhat more helpful information .... :-)
The 4032 and 8032 normally give a "beep series", which
might be interpreted as "four beeps" - is it sort of one
long continuous beep that warbles four times, or is it
four distinct beeps?
If the former, then it's normal, if the latter, then I
don't recognize it. I dug through the starup code a fair
bit in debugging my SuperPet (8032 from 6502 point of
view) and I don't recall anything along the way before
video-init and startup message that would generate beeps
other than the "Warble".
First, make sure the monitor is working (There's a
brightness control on the back which may have been
turned down) - Check for power to the monitor, and
if you have a scope, look for drive signals.
If you think the monitor is working, then you can get into
the internal monitor by grounding the "diag" pin on the
User port - In my experience, this comes up a LOT easier
than BASIC, so it may come up even if Basic won't. Once
you get that far, then the rest should be easy.
In working on a 4032 and three 8032s recently, here's what
I found:
- Bad 4116 DRAM's - I ended up replacing 5 DRAM's in total
(IMHO This is a very likely reason for what you are
observing - one of mine hung in the ram-size function
due to a bad DRAM)
- Bad 2114 Video SRAM's - I had to replace two of these
(and a few more in Commodore disk drive units) - these
will cause "bad video" but you should still get SOME
video.
- Bad power regulator the 12v regulator on one of my 8032s.
Didn't run across any this time, but I have seen bad ROMs
in PETs in the past.
Regards,
Dave--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
Hi Stan
I don't know much about PET's but I guess "working"
means it beeps 4 times. That is working, isn't it?
Dwight
>From: "Stan Sieler" <ss(a)allegro.com>
>
>Hi,
>Does anyone know what 4 quick beeps at
>power on means for a Commodore PET 4032?
>
>When I hit the power switch, the 4 beeps
>come immediately, and then nothing ...
>no sound, and nothing at all on the CRT.
>
>This is a new-to-me 4032, allegedly working.
>
>thanks,
>Stan
>
>
Does anyone know how an RM05 drive assembly fastens to the massbus
control cab beneath? Doesn't seem likely that the drive assembly just
rests on top - but there's no obvious way of securing the drive/cab
together. I assume something's supposed to thread through the bracket at
the top-front of the control cab and attach to the drive, but what/how?
And then what secures the drive toward the rear?
We almost got out Decsystem 570 completely rebuilt yesterday (it was
totally dismantled and parts have been spread everywhere for the last
few years) - just got the battery backup units and comms brackets to
bolt on, and a couple of minor bits of trim to find and it's done.
I'd stick some pictures up somewhere but I've just realised I have no
idea how to get them off the camera with this new version of linux -
d'oh! :-)
cheers,
Jules
Yes,
I have too many HP-110 Plus portable computers - this
is the one with the large screen - 80 X 25 text.
Works great, no power adapter, but the soft carrying
case is included.
I'd love to trade one for an
Otrona Attache,
Atari Stacy,
ZX-Spectrum,
cold hard cash,
????
__________________________________
Do you Yahoo!?
New and Improved Yahoo! Mail - 100MB free storage!
http://promotions.yahoo.com/new_mail
