On Dec 3, 3:55, der Mouse wrote:
> [cisin(a)xenosoft.com]
> > "carbonic acid" is water with CO2 in suspension??
>
> [vance(a)neurotica.com]
> > No. Not in suspension. In solution.
>
> It's not quite a solution in the usual sense of the word. More like
a
> reaction product - but it's one which is fairly close to balanced
> energically and thus can run either way with relative ease, either
> H2O+CO2->H2CO3 or H2CO3->H2O+CO2. (Most reactions run both ways in
> theory, but with a large energy difference that makes it easy to run
> one way and hard the other. An example is NaOH+HCl = H2O+NaCl+heat,
> with the "heat" term large enough, especially compared to the
> activation energy, that it's _hard_ to make salt water disassociate
> into caustic soda and hydrochloric acid.)
<tongue-somewhat-in-cheek>
Well if we're being picky, then I'd say it *is* a solution in the
normal sense of the word. Carbonic acid is a very weak acid, and the
reaction is firmly in favour of a predominance of CO2 in solution.
For the rest, CO2 and water each dissociate just like any inorganic
compound in water. You don't really form H2CO3, you form 2 x H+ and
CO3--. Similarly, when you have salt water, you have Na+ and Cl-, plus
a few hydrogen and hydroxyl ions, not "molecules" of NaCl. It's not
*that* hard to turn it into NaOH; a 1.5V battery[1] will add electrons,
cause hydrogen to be given off, liberating chlorine as well, and what's
left is Na+ and OH-. See, we're back to electrons again :-)
</tongue-somewhat-in-cheek>
[1] Yes, I know it's a single cell, not a battery :-)
--
Pete Peter Turnbull
Network Manager
University of York
JC,
I can help with that one. The SIMH docs state:
" 3.7.2 User Specified Stop Conditions
Typing the interrupt character stops simulation. The interrupt character
is defined by the WRU (where are you) register and is initially set to
005 (^E)."
If I do a "E WRU" I get "WRU: 005:
If I tell SIMH "D WRU 007" that changes the interrupt from ^E to ^G.
I hope this is what you are looking for.
Mike.
Hi,
Another auction:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3445280936&category=3666
This one has 4 CSA TEK boards on its own backplane. Really cool. Have too
many of these, so I am not bidding on this. Ships worldwide...
Ram
? 2003 OpenLink Financial
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>Yes, a KFQSA controller creates up to three MSCP controllers;
>one for each device connected (in my VAX 4705A, which only HAS
>three drives.. it may support the full 7 drives..)
It does... I've done it (back when I was doing some work on having
KFQSA in a qbus pdp-11 and running RT-11 on the disks it was
attached to).
>also using that address, indeed. Most KFQSA's are configured
>to allocate as many controllers as needed, with the first one
>sitting at the MSCP-default address, soo..
They don't allocate addresses as you put disks on... you have to
configure the board using the SET HOST command on a uVaxIII
(which is what I did). I think you have to set the board to a
specific address to program it first, and once programmed you set
it back to the normal use address (there is a 4-switch switchpak
on the board)
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | email: mbg at world.std.com |
| Member of Technical Staff | megan at savaje.com |
| SavaJe Technologies, Inc. | (s/ at /@/) |
| 100 Apollo Drive | URL: http://world.std.com/~mbg/ |
| Chelmsford, MA 01824 | "pdp-11 programmer - some assembler |
| (978) 256 6521 (DEC '77-'98) | required." - mbg KB1FCA |
+--------------------------------+-------------------------------------+
> They don't allocate addresses as you put disks on... you have to
> configure the board using the SET HOST command on a uVaxIII
> (which is what I did). I think you have to set the board to a
> specific address to program it first, and once programmed you set
> it back to the normal use address (there is a 4-switch switchpak
> on the board)
>
Megan, do you know the jumper settings for the KFQSA ?
Or anyone else ?
Yesterday I did another try.
The KDA50 works now at address 172150, with the KFQSA removed. The command "show qbus"
finally lists the controller.
Antonio named I link for KFQSA documents but they don't have documents online for it.
How do I have to set jumpers for this board?
My VAX4000 found the RA-92, attached to the KDA (DUA0).
The userguide of the KDA50 refers to a programm called MDM in order to do some diagnostics with the KDA and FORMAT the harddrive.
My idea is to boot NetBSD over Ethernet and install it on the RA-92 (there are no other drives installed in the VAX!).
Can BSD find the drive directly, format it and be installed on it, or do I have to need a special programm as MDM to format the drive?
Pierre
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On Dec 2, 19:30, Witchy wrote:
> Whilst getting an old Videomaster pong ready for sale (even though I
know
> nobody will buy it) I discovered it still had its batteries in from
the last
> time it was used - 1970s by the looks of the batteries - and they'd
> naturally leaked all over the place.
>
> I've tried standard Foamcleaner (anti static, natch) to remove the
lovely
> brown stuff but it's not having any of it. Any tips for removal of
this
> stuff without scratching the plastic too much?
I guess it depends on what the brown stuff is, and where it is. On the
case? You could try soaking it in something mildly alkaline, like
washing soda, or in sugar soap solution, and see if it softens it. Is
this a deposit on the surface, or has it combined with the plastic? So
long as it's not actually reacted with the plastic, I find Flash is
pretty good. A small bucket of hot water with a dollop of Flash, and a
cloth, is my weapon of choice for cables and metal/plastic cases.
--
Pete Peter Turnbull
Network Manager
University of York
On Dec 2, 21:57, Ron Hudson wrote:
>
> On Tuesday, December 2, 2003, at 09:50 PM, vance(a)neurotica.com
wrote:
>
> > On Tue, 2 Dec 2003, Joe wrote:
> >
> >>> While everybody else is talking about cleaning up the leakers,
> >>>
> >>> Is this chemical is good use to dissolve rust on steel screw is
rust
> >>> seized in the potmetal or aluminum distributor?
> >>
> >> No, not really. The best thing for that is Break Free or some
other
> >> kind of penetrating oil.
> >
> > I use WD40. It's cheap.
> >
> > Peace... Sridhar
> >
> >
> Naval (as in Navy) Jelly?
No, Naval Jelly (or phosphoric acid) is what was originally mentioned.
It won't penetrate into the threads of a tightly-fitting screw, and if
it did, the phosphate it left behind would be almost as bad as the
rust.
Break Free isn't a penetrating oil, it's a lubricant with PTFE in
suspension.
WD40 isn't nearly as effective as a proper penetrating oil. It will
*prevent* rust but not remove it -- it's a water displacer.
--
Pete Peter Turnbull
Network Manager
University of York
Found this in the rubble, and can't find diddly on the internet about
it.
ISTR it was tied into the floppy drive controller, and it has the 34 pin
header that matches?
No other identifying numbers, but I think it might be a DJ-20C. QIC-80
cartridge, maybe?
I'd just like to see if it works with my Linux box here or not. Might
just delegate to the junk Windoze box instead, if it does work.
Any answers? Point me in the right direction, even if it is to the
dumpster. LOL
Gary Hildebrand
St. JOseph, MO
