While archiving a bunch of old 8 inch disks I found disks that apparently
contain an old RSX11S system. I think it has been used in some kind of
railroad CTC system.
https://dl.dropboxusercontent.com/u/96935524/Datormusuem/PDP11RX01DISKS/DIS…
It is possible to boot this image in SimH (when setting CPU type to 11/03,
11/23 (F11), 11/34 or 11/73 (J11) )
I get this:
sim> b rx0
XDT: 18
XDT>g
RSX-11S V02 BL18
DEVICE TT01: NOT IN CONFIGURATION
DEVICE FT00: NOT IN CONFIGURATION
>a
MCR -- 1
>b
MCR -- 1
>ccc
MCR -- 1
>
So first there is a XDT> prompt. By pressing g or p it starts RSX11S. But
it seems to be possible to do other things. Commands like "s" and "l" do
stuff "x" causes:
XDT>x
SYSTEM CRASH AT LOCATION 025276
REGISTERS
R0=000000 R1=177170 R2=003403 R3=157000
R4=012422 R5=000002 SP=157004 PS=000340
SYSTEM STACK DUMP
LOCATION CONTENTS
157004 157150
HALT instruction, PC: 000572 (MOVB #15,R2)
sim>
I understand that RSX11S is a scaled down version of RSX11M. An embedded
RTOS of that day. But what kind of commands are possible at the XDT and
MCR(?) prompts. I am a little bit curious to understand more about the
system that it has been running.
/Mattis
Folks,
I've found something I forgot I had; a Baydel Unibus disk controller.
At one time I had 3 or 4 of these in complete systems but carelessly
managed to trade them all away(!) - except this one board.
They were all identical; a pdp-11/04 with a quad Unibus Baydel disk
controller hooked up to an 8" hard drive in a separate rack mount. In
use the Baydel subsystem emulated multiple RK05s.
The part number on the board is B01061. Unusually Google seems to be
utterly silent on the subject; it seems Baydel and these products have
slipped beneath the digital waves without trace. Does anyone have any
information?
I just have the controller board; I don't have any of the hard drives
left. All I remember is the disk was an 8" and the interface is a
single 40-pin cable; so not SMD and not SCSI. Far too early for IDE or
ATA. Any suggestions for what the interface might have been and what
disks might have been used? What hard disks were around in late 70s /
early 80s that used a single 40-pin connector??
Thanks
Mike
http://www.corestore.org
'No greater love hath a man than he lay down his life for his brother.
Not for millions, not for glory, not for fame.
For one person, in the dark, where no one will ever know or see.'
>From the CHM:
"Dear all,
The museum is remembering Andy S. Grove, who passed away last night. Please read David C. Brock?s timely blog post this evening, http://www.computerhistory.org/atchm/remembering-andy-s-grove/
Best,
Kirsten Tashev
Vice-President, Collections & Exhibitions
Computer History Museum"
I met him during my time at Intel, he attended a couple important meetings (acquisitions discussions, company wide technical strategic planning meetings, quarterly meetings). But already in not so good health and not saying much. We sure listened when he spoke up. I remember in particular once when Intel had a really bad quarter because we raised the price of Flash, after misjudging worldwide inventory. We consequently lost a large part of the market to Samsung ? which probably never returned. Most CEOs would have fired the VP, but instead he took the mike and congratulated him for having had the guts to raise prices. We all applauded, but I distinctly remember I wasn't quite sure why... Bless his soul, he brought a company back from the brink of extinction selling RAM at negative margins, to industry dominance in microprocessors with 65% gross margins. That is excessively difficult to do.
Marc
I'm trying to figure out a logistical nightmare to get a number of machines
down there before I commit to any reservations. I'm several hours East of
Vancouver Canada but there is several hundred pounds in Silicon Graphics
workstations, monitors and peripherals I planned to take. My car is far too
small and I am not fully licensed to rent a truck for the week. Best I can
hope is someone else with a large vehicle is going the same direction there
and back. Can totally help to pay some of the costs.
-John
I've just finished a restoration of a TU58 drive. I'm looking for a small
quantity of TU58 tapes (perhaps 2 tapes?) to use with it.
Ideally I'm looking for tapes that have been run through a drive recently
and known to be not shedding oxide.
If anyone has some that they are prepared to part with, please let me know.
I'm happy to pay for the tapes plus shipping.
Thanks - Malcolm.
Hi all --
My call for a VAX-11/750 a month or so ago actually bore some fruit
(locally, even!) and as of a couple of weeks ago, I now have a very
nicely configured 11/750 system taking up most of the basement. The
previous owner got it after it was retired from a local(ish) university
in the mid 1990s and it has not been powered on since then. Apparently
at the time of its retirement the power supplies were exhibiting "random
issues." (No more detail is available than that on the history...)
At any rate, I went through the two power supplies (and the small pilot
supply in the power controller) and found a lot of leaky capacitors (as
in, yellow/brown goo was coming out of maybe 2/3 of them) so I went
ahead and recapped the whole thing.
At the moment I have things running on a dummy load in the 11/750
chassis. (the harnesses are still hooked to the chassis backplane, but
all cards have been pulled, and the backplanes thoroughly checked for
bent pins, etc.) The H7104-C (2.5V) supply seems to be working fine but
the main 5V supply in the H7104-D is not doing so well (and as a result
the other voltages it's supposed to be producing are also not present).
The Power Controller lights up the "Reg. Fail" lamp (I don't know why
the 5V Fail lamp isn't also on) and the 5V supply emits a loud
(somewhere around 400Hz?) whine/squeal. I get about .3V out of it with
a load. Without a load there's no squeal and I get about 5.6V, but
that's not particularly useful.
I've double-checked everything in the H7104-D and there's nothing
obviously wrong (no caps installed backwards, no scorched components).
At the moment the H7104-D is hooked up only to a dummy load, so it's not
anything on the backplane shorting out or causing issues.
This is another one of those cases where I've gotten myself in over my
head with large, complicated power supplies -- anyone have any
experience with these? Any tips?
Thanks as always,
Josh
I have a vintage DEC 19 inch rack with a Kennedy 9400 Tri-Density 9-Track tape drive located in Exeter, NH, USA that needs a good home. If you?re interested I can send some photos, etc.
Thanks,
-Mardy
