I worked on a BA11K PSU just a month ago. One 5V brick was defective ...
You are correct, the blue wire (there is just one blue wire to the
distribution panel) is indeed -15V.
What is happening to the H7441 when you try to make a measurement puzzles
me, though.
Most of the power bricks only need 20-30 VAC input, so with a small 1A.
transformer that puts out some 24V, you can check the brick on the bench
outside the BA11K, which is a lot easier to work on.
The "bad" news is that there is on exception, the H745 ... that one needs,
besides the 20-30 VAC, also +15VDC for proper operation. But as discussed
in another thread, a good bench has a laborytory power supply ...
- Henk, PA8PDP.
________________________________
Van: cctalk-bounces at classiccmp.org namens Wolfe, Julian
Verzonden: di 10-01-2006 22:05
Aan: 'General Discussion: On-Topic and Off-Topic Posts'
Onderwerp: Measuring regulator values on H745
Okay, I was trying to find out if my H745 is shady, so I busted out the DVM
and put the probes on the blue wire and a ground wire. (blue is supposed to
be -15v) Nothing. Okay, so just to check my logic, I hooked the probe to
what is supposed to be a +5v line and a ground on the same connector, and
the light on the 7441 regulator goes out. Nothing on the DVM.
The DVM is set to "20" in the "DC volts" area (it's one of those yellow dial
type DVMs)
Deposits work, but exams cause a bus error. My power supply isn't shot in
all areas, so how am I measuring this wrong? I'm measuring at the power
control board, where the backplane connectors are plugged in, and I'm using
the BA11-K manual and prints as a reference for the wire values.
What am I doing wrong?
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I *assume* that the cable has at least one wire that connects ground
of the RL11/RLV1[12] controller to ground of the RL drive. Further,
I have never seen an RL drive that had a ground wire connected from
the metal cahssis of the drive to the ground of the cabinet in which
the drives was mounted.
I have once seen a cable that had a braided wire at one end (or was
it on both ends?), but AFAIK was that the cable for an RLV controller
installed in a BA23 or BA123 box. That is a short cable (IIRC 50 cm)
to the bulkhead at the rear side of the box.
So, what you describe (strange things if not grounded) are effects
that I have not seen (up till now) ...
Perhaps the experts can elaborate more, as I do not consider myself
to be an expert :-)
- Henk, PA8PDP.
________________________________
Van: cctalk-bounces at classiccmp.org namens Julian Wolfe
Verzonden: di 10-01-2006 21:53
Aan: 'General Discussion: On-Topic and Off-Topic Posts'
Onderwerp: RE: RL drive problems ...?
I know this sounds stupid, but is the cable grounded? I've had really
stupid/strange things happen when my RL02 cable is not grounded properly.
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Hi Chuck
Sorry for the late response. This was from the begining of
October. Can you look into your manual and see if it has
the 8X300 controller chip with the WD11xx support chips?
If so, I'd be interested in a copy of it.
Thanks
Dwight
>From: "Chuck Guzis" <cclist at sydex.com>
>
>I've got the OEM manual for the WD 1001 controller, if that'd help.
>
>Chuck
>
>
>
Okay, I was trying to find out if my H745 is shady, so I busted out the
DVM and put the probes on the blue wire and a ground wire. (blue is
supposed to be -15v) Nothing. Okay, so just to check my logic, I hooked
the probe to what is supposed to be a +5v line and a ground on the same
connector, and the light on the 7441 regulator goes out. Nothing on the
DVM.
The DVM is set to "20" in the "DC volts" area (it's one of those yellow
dial type DVMs)
Deposits work, but exams cause a bus error. My power supply isn't shot
in all areas, so how am I measuring this wrong? I'm measuring at the
power control board, where the backplane connectors are plugged in, and
I'm using the BA11-K manual and prints as a reference for the wire
values.
What am I doing wrong?
Hi,
I would like to hear from the specialists what they have to say
about this problem.
I finally got my 11/34C running again. It has an RL11 and has
two RL02 and one RL01 connected. Most of the time I cannot boot
RT11 from the RL02-DC, but sometimes the boot is successfull!
If the boot fails, I see the READY lamp of the drive flash once,
then the RUN light goes off, and the display shows 000004. BTW,
at the end of the RL drive chain is of course the terminator.
The cartridge was written while the system was still in my house
(some 3 years gao, at some 20" Celcius), but the system is now
in a 12" Celcius environment. Could the temperature difference
make the disk too difficult to read in the nwe conditions?
When RT11 runs, and I only do a .DIR command of the disk, is
there something written to the disk? That could make the disk
"useless", because of the 20"/12" Celsius issues?
Another problem that I have since I have power for my systems
is that the READY lamp of the RL01 is *always* ON.
The FAULT lamp is OK - and is OFF. I have not yet investigated
this problem, but hints in advance are appreciated :-)
[would save me some time, to work on the other projects, like
the floppy disk interface for the 6809 Core Board...]
BTW, the system worked fine, 3 years ago ... it has power since
a few weeks, and I had a lot of problem getting the 11/34C up
and running, but that would be a different story too ...
greetz,
- Henk, PA8PDP
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If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited.
If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message.
Thank you for your cooperation.
> Sometimes I wonder if tomorrow's lead will be today's
> mercury--that is, schools will be closed for three days
> because some child brought in a fishing sinker to show and tell..
That day is close, lead fishing weights are banned in some states
because waterfowl, especially Loons, were being killed off from
ingesting lead weights while foraging on the bottom of lakes.
> Maybe I'm too old to deliver a modern opinion on how much
> exposure is safe.
> Heck, I still miss carbon tet and zinc chromate.
I miss DDT.
On Jan 6 2006, 16:20, Bj??rn Vermo wrote:
> On Fri, 06 Jan 2006 15:26:13 +0100, James Fogg <James at jdfogg.com>
wrote:
> >
> > All automatic dishwasher detergents have lots of chlorine and might
> > bleach (great for discolored plastics),
>
> Not just that, it might cause highly unwanted chemical reactions with
some
> plastics, and certainly with any exposed copper.
>
> > Powdered automatic dish detergent has silicone dioxide (sand) and
will
> > scour your boards,
> >
> > Because of the above 2 items you might want to use "hand"
dishwashing
> > detergent, but not much since it will foam,
>
> I would suggest crystal soda, it is a good detergent and not overly
> caustic, and the rinsing cycle will get rid of residues.
> Ammonia solution would work, but would be quite smelly.
Some of you seem to have slightly odd ideas about detergents :-)
I know of no dishwasher detergent that contains chlorine (which is a
gas) nor large amounts of chlorine-based bleaches. (Mild) Bleaches and
brightners are common in *clothes* detergents where there are good for
stain removal, but they're *not* good in dishwashers, where the bleach
would tend to fade patterns on crockery. Therefore dishwasher
detergent manufacturers use only very small amounts, if any, and
they're usually oxygen-based.
More to the point though, they don't contain silicon dioxide, at least
not any I've come across (btw it's silicon, not silicone). They might
feel gritty, but that's not sand, it's solid detergent. If you
dissolve dishwasher detergent (loose powder or a tablet) in a jug of
water, it will eventually dissolve completely, leaving no sand behind.
Do you think manufacturers would put sand, one of the few common
substances that will scour glass, into a substance used for cleaning
glassware?
If you're worried about the powder, it's perfectly possible to get
liquid dishwater detergent.
Crystal soda is not a detergent. It's sodium carbonate, Na2CO3. It
*is* caustic, it's a mild alkali. That's why it works -- it saponifies
oils, in the same way caustic soda or caustic potash do. That is to
say, it chemically reacts with oil and similar things to turn them into
something water-miscible. Detergent, on the other hand, does not react
with oils, it works like soap to mix with free oily substances and
water. Ammonia is worse and not good for some plasics. Don't put
those in your dishwasher.
Finally, detergent won't damage copper, aluminium, steel, or other
metal. Water will. Detergents can remove oils and other thin-film
coating that might protect metal, so it is wise to dry things carefully
after getting them wet because water and air can cause corrosion, but
it's not the detergent that does that, it's the water. Well, actually
it's the air, but water permits various electrolytic reactions that
hasten the process.
--
Pete Peter Turnbull
Network Manager
University of York
-----Original Message-----
>From: Jim Battle <frustum at pacbell.net>
>Sent: Jan 10, 2006 10:13 AM
>To: General Discussion at null, On-Topic and Off-Topic Posts <cctalk at classiccmp.org>, null at null
>Subject: Re: Paul Allen opens PDP Planet web site
>
>Robert Feldman wrote:
>> There is a short article on the site at
>> http://www.theregister.com/2006/01/10/allen_pdp/
>>
>> The site is at http://www.pdpplanet.com/
>
>http://www.pdpplanet.com/TemplateMain.aspx?contentId=7
>
>The link to the Wofford Witch page is there, explaining the uptick in activity
>on that page that Ashley Carder noted.
>
Perhaps I should spend some time beefing up my site, adding more
technical info (which I've been intending to do, but just have not done),
and adding more information about how to find your way around on
the system.
Ashley
I don't know about the OS8 PDP-8 BASIC, but on the RSTS/E PDP-11 Basic-Plus, the same sequence of random numbers would always be returned unless you used the RANDOMIZE statement, which changes the random number seed.
If your PDP-8 OS8 BASIC supports it, add a RANDOMIZE statement and you should then get a different series of random numbers each time.
Ashley
-----Original Message-----
>From: charlesmorris at direcway.com
>Sent: Jan 10, 2006 9:24 AM
>To: cctalk at classiccmp.org
>Subject: Non-random numbers (SIMH PDP-8)?
>
>I was playing blackjack (BASIC program) on SIMH with my OS/8 RL02 image. I noticed that every time I played the game the cards drawn were identical, both by the dealer and myself! A loop to print RND(0) ten times always shows the same ten numbers... doesn't sound very random to me :)
>
>Is this an artifact of SIMH, or BASIC? (Will it go away when I run the program on the real 8/A)?
>
>thanks
>Charles
>
>
