Is anyone here familiar with a RK05 tester? Any idea exactly what it is,
and what it is capable of testing? I'm looking into possibly buying one.
-Lawrence LeMay
On Feb 11, 22:21, Tony Duell wrote:
> So yes, it can be got to work. But it's not trivial (as far as I can
> remember, the commericial process involved a catalyst as well).
Both commercial processes do (well, the NO2 in the lead chamber process
isn't strictly a catalyst, but it goes in one end and is mostly recovered
at the other, so it's similar). It's a question of speed and yield.
> I am not saying that there is _no_ SO3 produced without a catalyst (so
> that, for example, I would easily believe that 'acid rain' contains some
> sulphric acid produced by the oxidation of SO2 in the atmosphere)
It does. A good proportion of SO2 is converted to sulphuric acid by the
action of strong sunlight on the SO2 and water vapour. A slow process,
though. The major constituents of acid rain are SO2 and various nitrogen
oxides, roughly 70% and 30% respectively.
--
Pete Peter Turnbull
Network Manager
University of York
>Well, I've seen a few parallel ports that lost their magic smoke after an
>external SCSI zip drive was plugged into them. I'd have to say it at least
>isn't safe to mix up parallel and scsi ports...
I know the Mac SE will survive having its SCSI port connected to a
parallel printer. Although the Mac will not boot unil the cable is
removed (it will sit with a flashing ? as the printer will confuse it,
and it will fail to check the SCSI chain for a boot device).
I know this because I had a location do just this... and then bitch that
the Mac was dead (and then ship it to me FedEx P1 to fix... costing the
company about 10 times the value of the Mac in shipping charges).
They left everything connected (literally, they just took a big box,
dropped the printer in it, then dropped the SE on top, followed by the
keyboard and mouse... leaving ALL cables still interconnected!).
One look at the printer cable and I knew what the problem was that was
keeping the Mac from booting... I wasn't very surprised the office staff
had done this... but I WAS very surprised to see the Mac boot fine as
soon as I removed the parallel cable... I had figured they fried the SCSI
bus.
-chris
<http://www.mythtech.net>
On Feb 11, 21:29, Tony Duell wrote:
> There are stories of some UK machine (I want to say BBC Master, but...)
> being shipped with a lithium battery installed in place of a NiCd but
> still having the charger circuit enabled. Apparently it wasn't unheard-of
> for said battery to make a large hole in the cover....
It was an Acorn/BBC Master 128, but it only happened once, and it didn't
make a hole. However, it did happen in a teaching hospital, so there was
rather a lot of fuss about it. When Acorn realised what had happened, they
recalled all the lithium battery packs and replaced them with Duracell
packs.
I worked for Acorn at the time, and was peripherally involved in the
recall. Basically, I had to contact/visit all the dealers, education
authorities, and service centres in my patch and make sure they surrendered
all the lithium packs, both in machines, as held as spares, in exchange for
the replacements. Acorn didn't want to risk any repeat performance.
I can't remember much of the detail now, but I do remember having a
lifetime supply of 3V AA lithium cells (non-rechargable variety).
Unfortunately, "lifetime" means "shelf life" :-(
--
Pete Peter Turnbull
Network Manager
University of York
On 10-Feb-2002 Tony Duell wrote:
[...]
> Difficult != impossible. I am told it's difficult to repair HP9100
> calculators. Doesn't mean I don't attempt it ;-)
OKOK, I'll try... ;-)
[...]
> That is possible. I worked on an HP9000/835 a few years back (not my
> machine, so I can't check any details now), and I remember that one of
> the 'logic' boards had to be in place for the PSU to start up. And it
> wasn't just a dummy load -- we tried that.
If that's the case I'll have to connect the PSU to the computer
to test it :-(
bye
--
What the gods would destroy they first submit to an IEEE standards
committee.
FWIW
Several times there have been discussions on this list about wheather or
not IBM ever made cassette drives for use with the original IBM PCs. The
general feeling is that they never made any cassette drives or tapes. BUT I
was talking to Mike Haas about this recently and he told me that he has an
original IBM Diagnstics cassette tape! Today he sent a picture and I've
posted it here <http://www.classiccmp.org/hp/ibm/ibm-cass.jpg> . As you
can see it has the same burgundy color as the standard IBM PC diagnostics
disks.
Joe
On Feb 11, 9:22, Russ Blakeman wrote:
> How many pins does the centronics have? Might be SCSI if it's Centronics
50
> rather than 36. The 20 is probably a db25 that is also an alternate SCSI.
You mean "Centronics-style", I think :-) "Centronics" connectors are
36-pin.
Anyway, it's not SCSI. It's a proprietary HP interface, and the 20-pin
connector is for a proprietary HP sheet feeder.
--
Pete Peter Turnbull
Network Manager
University of York
On Feb 11, 9:44, Joe wrote:
> I wa swaiting for his. You're right. but SO2 can react with O2 and
> moisture in the air to form H2SO4. In fact, that's how sulfuric acid is
(or
> was) prodused commercailly. I certain proportion of H2SO3 is also
produced
> I'm told that it's only a small amount and it's some how removed and
> retreated to form H2SO4.
No, it's not, and never was. There's practically no reaction at room
temperature and pressure. In fact it's very easy to turn SO3 back into SO2
and oxygen. Just leave it alone for a while.
In the normal "Contact process", SO2 is passed over a catalyst at about 500
deg F, usually VO5 (Vanadium Pentoxide, not hairspray) commercially, or
occasionally platinum (in demos) because it *doesn't* normally react with
oxygen. The SO3 is then dissolved in concentrated sulphuric acid (H2SO4)
because it doesn't dissolve very rapidly in water, particularly when warm,
and and the heat of solution would boil water. The concentrated sulphuric
acid becomes fuming sulphuric acid ("oleum", H2S2O7) and cold water is
continuously added to reduce that to concentrated sulphuric acid again.
The other practical[1] method uses very hot concentrated nitric+sulphuric
acid as an oxygen carrier -- again, because the oxidation of SO2 is too
slow and the activation energy would be far too high otherwise. The SO2,
at about 500 deg F (again) combines with NO2 (from the nitric acid) and
water to give H2SO4 and nitric oxide; the nitric oxide is then re-oxidised
to nitrogen dioxide, which in water gives nitric acid again. Now all you
have to do is separate the two acids.
[1] Perfectly practical providing you have some concentrated nitric acid, a
whole lot of stainless steel tubing, a couple of lead vessels (this process
is called the "lead chamber process") and a tower built of acid-resistant
bricks, and a water cooling tower.
> Yes, but that's a lot less S02 than the amount in the batteries. I'm
not
> suggesting that everyone of the room is going to die but if one of the
> batteries ruptures, it will certainly empty the room in a hurry!
There's not much in a battery. The equivalent of about 1/4 teaspoonful of
sulphur at most, and I suspect, much less.
--
Pete Peter Turnbull
Network Manager
University of York
> -----Original Message-----
> From: Sellam Ismail [mailto:foo@siconic.com]
> Yes, yes, yes and yes. I neglected to mention TK50 (but have
> a drive), I
> don't know what QIC-1000 is but I want a drive for it. And
> with regards
> to the last two, if you read my message you know that I
> already specified
> those.
Sorry. I did read it, but it's been a couple of days, and I'd
forgotten (not surprisingly. :)
QIC-1000 is -- I think -- a higher-capacity cartridge drive
similar to the QIC-120.
Chris
Christopher Smith, Perl Developer
Amdocs - Champaign, IL
/usr/bin/perl -e '
print((~"\x95\xc4\xe3"^"Just Another Perl Hacker.")."\x08!\n");
'
