I took the plunge and put in the CPU modules (M7133 and M7134) into the
PDP11/24. The machine powered up and the DC ON light came on, suggesting
voltages were in tolerance. So I connected a terminal and got an ODT prompt.
I then tried to run a basic diagnostic (using the ODT command 165000G). It
came back to the prompt and I was just entering another command when I heard
a vague click and the machine powered off. I cannot power it on now.
Previously after connecting it to the mains I would hear a slight click, but
I don't even hear that now and turning the key will not even start the fans
running.
However power is getting to the big capacitors because I can see that with
my multimeter, so it is not the external fuse or the circuit breaker I
think. Presumably some internal fuse has gone, I will leave it to discharge
and take a look tomorrow to see if I can find an internal fuse. Any other
ideas as to what this might mean?
It was going so well..
Regards
Rob
Hey! Would 150ma be enough current on various voltages for programming
eproms? I just got a bunch of 14 pin DIP VRMs that are rated for 150ma
output without using a bypass transistor.....
At 12:00 -0500 4/26/11, ard wrote:
>One of the easiest things to sue for this are low voltage filament
>lamps 12V car bulbs (say a 12V 5W taillight bulb) is fine for a 12V
>supply. And probalby fine for a 15V supply too (yes, the bulb will have a
>short life at the higher voltage, but not so short as to worry you). For
>the 5V line, a 6V bulb is the best thing to use, many older cars had 6V
>electrics nad you may well be able to get a 6V 30W bulb (which will draw
>around 5A) from a vintage car parts company. I bought a couple of
>headlight bulbs (each with a apr of 30W or so filaments and a couple of
>stop/taillight bulbs (5W and 21W filamnets). That gives me a good
>selection of laod currents (and yes, I once parallel to two filaments of
>a headleam bubl to give a load drawing somewhat more than 10A to test a
>large SMPSU).
FWIW, bicycles use a wide variety of bulbs, in a wide variety of
voltage ratings. Here's one page
http://www.reflectalite.com/halogenpage.html
listing a bunch of them, in voltages from 2.2 V to 6 V and wattages
>from 1.25 W to 20 W. (Not a recommendation, they were just what came
up first when I googled "bike headlight bulbs". I'd actually
recommend your local brick-and-mortar bike shop, who could probably
use the business...)
I don't expect these are very cost-effective, but they should be more
available (for the time being, anyway, until LED's take over there
too) than antique-auto bulbs. But you may want/need to run several in
parallel to add up the required power.
--
- Mark 210-379-4635
-----------------------------------------------------------------------
Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:
Think of it as Evolution in Fast-Forward.
At 18:09 -0500 4/27/11, ard wrote:
>[1] I am not one of those. I have no qualifications in electronics or
>computing.
I think it would be fair to insert the word "formal".
>You mean you don;'t have a bench supply???
Well, I have some orphaned in-line or wall-wart supplies intended for
computers, radios, etc. that I could chop the connectors off of. But
I figured the jump cables could put out more current.
>H2 normally comes off at the -ve electorde too...
Yes, and I do know which jump cable is negative. So I guess I
shouldn't claim I was "lucky". But I was pretty prepared to be wrong,
on the whole. Chemistry puzzles me.
>It's not uncommon to get Cl2 at the positive electrode. Another reason to
>do it in a well-ventilated area.
True! I forgot about that. The chemistry book we were looking at said
at a more concentrated solution of salt was more likely to produce
Cl2. That was a pretty simple mnemonic for me to remember, so I
didn't use much salt.
--
- Mark 210-379-4635
-----------------------------------------------------------------------
Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:
Think of it as Evolution in Fast-Forward.
At 18:59 -0500 4/26/11, ard wrote:
>If you are really crazy, use containers of salt water with suitable
>electrodes in them :-). Just don't knock them over and spill the liquid
>into the machine under test.
...and do work in a ventilated area. The bubbles evolving off the
salt water will be, er, flammable, yes?
Did this with the kids, 12V supply = jump cables from my car,
foil "electrodes" in salt water, inverted test tube on a long holder,
and a candle to verify the type of gas (used the holder to move the
tube over the candle). Lucked out and collected the Hydrogen on the
first try (well, it wasn't really luck. The electrode with twice as
many bubbles had to be the H2.) They were suitably impressed. I was
impressed how fast the aluminum foil went away (into solution).
--
- Mark 210-379-4635
-----------------------------------------------------------------------
Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:
Think of it as Evolution in Fast-Forward.
On Fri, 29 Apr 2011 14:21:46 -0700 (PDT), ene Buckle <geneb at deltasoft.com> wrote:
> On Fri, 29 Apr 2011, Tony Duell wrote:
>
>>>
>>> On 4/28/2011 3:24 PM, Tony Duell wrote:
>>>
>>>> I will crtainly agree that it is possible to be self-taught, and that
>>>> said 'traching' can go to a very high level. Just becase you haven't got
>>>> a bit of paper saying you know<foo> does not beam that you know nothign
>>>> about<foo> or, indeed, that yuou know less about<foo> than people with
>>>> said bit of paper.
>>>
>>> Tony,
>>>
>>> I can usually decode your many misspellings and lysdexic-isms, but what
>>> is "traching" ? Is this supposed to be "teaching?" Or perhaps some
>>> British slang I'm not picking up on?
>>
>> No, it's 'teaching'. Hit the wrong key ('R' is adjacent to 'E'...)
>>
>
> You might want to try using one finger from each hand at a time instead of
> two. :) *gd&r*
C'mon guys, ease up. Half duplex is a bitch :)
->CRC
I need an ethernet converter between 10base2 and 100baseT.
I am using a DECserver90TL as a console server. The DECserver is 10base2
ethernet, so it has a BNC connector and I use coax to connect to an ethernet
hub. I was using a hub that had both 10baseT and 10base2 to connect it to my
100baseT network, but the hub has suddenly become unidirectional. A
lightening strike killed a few things in my house and now I see this hub
might be another.
eBay only finds me two items like this. One seems over priced and the other
says it is for parts only.
Do I have any other options?
-chuck
In the ongoing saga of my attempt to get RT-11 to run on my 11/34 .... (I'll spare the bandwidth by not attaching the entire chain of experiments run ...)
Checked my copy of RT-11 and indeed it was SYSGEN'd. In my latest attempt, I did a SYSGEN as well, this time choosing to build a very, very basic version of RT-11SJ on RX-01. No FPU support, no timers, nothing fancy. Added device support for TT, DX, and DU devices only (the 11/34 has no installed DU device at all, I wanted to add it for future consideration).
As expected, it went off for over a half-hour rebuilding RT-11. Produced the expected files and I proceeded to make the disk bootable. It boots on the LSI-11 system (an 11/73A) just fine. Put that same RX-01 disk on my 11/34 via an M7846 controller and when I tried to boot it I get the exact same result as before: it starts to boot, steps four tracks or so, then halts at "005134" on the display. If I inspect that address, it contains "140000".
Sigghhhhh.
Any thoughts as to what it could be? Disk controller card (M7846)?
Summary: Since I've first written in with the problem I think we've eliminated as possible issues:
* Memory since I had previously tried three memory cards all with the same result
* Basic CPU hardware (slot C and D jumpering, Unibus termination)
* RT-11 version 5 (which appears to run on other Unibus PDP 11/34s)
Corrected a few small bugs along the way (like the complete lack of a terminator at one end of the Unibus). The CPU runs small programs, entered via the front panel, just fine (e.g. a ten line program to echo terminal characters).
Just asking for ideas on where to go next! Anything else I should be checking?
Thanks .... Mark
Professor Mark Csele, P.Eng.
Niagara College, Canada
300 Woodlawn Rd., L-23
Welland, ON, L3C 7L3
(905) 735-2211 x.7629
E-Mail: mcsele at niagarac.on.ca
URL: http://technology.niagarac.on.ca/people/mcsele
Author of "Fundamentals of Light Sources and Lasers", Wiley, 2004
At 12:00 -0500 4/28/11, cctalk-request at classiccmp.org wrote:
>I've found it interesting that folks don't balk at having a roof
>flashed with lead or a stained-glass window that uses lead canes in
>their church, but get nervous if they come within an arm's length of
>the stuff.
<Sheepishly raises hand> Yup! That's me!
My father-in-law is a physician and also a Civil War buff.
For years he carried around a lead bullet he found on a battlefield,
as a good-luck charm. He showed me one time, and I asked him what he
did about the toxicity, pointing out the dark stains on his fingers
>from handling it. His eyes widened a little, and now it sits on his
dresser.
>Absent strong acids, metallic lead is comparatively safe.
Yeah. But "Chemistry puzzles me" and I'm not too confident I
won't inadvertently electrolyze some of the lead into solution. Nor
that the kids won't do so when they try something clever out.
Heavy-metal poisoning (not just lead, either) is one of those
slow-acting, subtle things where you can get into a lot of trouble
before you realize it. I know it's around a lot (like, the car
battery I hooked up as my power supply), but ... still, I feel like
minimizing exposure where I can, particularly since I don't much know
what I'm doing, either chemically or biologically.
Yes, I solder outside, for improved ventilation, when I
solder. I'll wear the "paranoia" badge but I may not change my
behavior.
--
- Mark 210-379-4635
-----------------------------------------------------------------------
Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:
Think of it as Evolution in Fast-Forward.
At 12:00 -0500 4/27/11, Chuck wrote:
>In the same vein, have you ever fooled with liquid rectifiers? The
>anode is aluminum; the cathode is usually lead in a soluton of sodium
>bicarbonate.
Have not tried it. Not crazy about fooling around with lead in
general, but I might do it some time, depending on how interested in
chemistry they get. Thanks for the suggestion!
--
- Mark 210-379-4635
-----------------------------------------------------------------------
Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:
Think of it as Evolution in Fast-Forward.
