>RD54 is Maxtor2190, look that up.
The RD53 is a Micropolis 1325 with a fumper installed in the empty R7
location.
>Now, heres the nasty part. Of the RD52/3/4 disks there are Quantum,
>Micropolus and MAXTOR drives non DEC branded. They are the same. They
>are also different! The NON-DEC supplied are not formatted to match the
>RQDX2/3 controllers. So if you find some D540s, you may also have to
>format them... you likely don't have diags to do that. So even with a
>pile of them your still not ahead.
>
>Solution: prevail on someone that bas a Qbus PDP-11 with diags that can
>format the drive.
Also they will have to be done manually IE: do not try to use the automatic
option.
I do it frequently for commercial customers. Often enough for me to
dedicate a BA123 primarily that use.
Dan
<Dunno. But those DEC drives are rebadged Connors, and the Connor norm was
Only some are. Some are Seagate and others are DEC unique design. I
believe the RZ56 is micropolus. However the one I'm holding does not say
that.
Allison
On Dec 3, 16:35, CLASSICCMP(a)trailing-edge.com wrote:
> The indium-rich solders are *really* neat stuff, if you ever get a
> chance to work with them. Melting temperatures down to near room
temperature
> are available, as well as entire series of solder alloys with graduated
> melting temperatures for building up intricate assemblies. And many
indium
> solders will even wet and stick to *glass*.
Yes, you just reminded me of a visit years ago to an optical works owned by
a friend's father. How do you mount an unfinished non-circular glass lens
in a lathe (of sorts) to finish it? Answer: you take some LMP alloy such
as you describe, melt it in a short cylindical mould, float the lens on
top, let it cool, and mount the cylinder with glass attached in the lathe
chuck. To remove the alloy later, place it in a warm water bath.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Ok,
Well I suppose I will add my odd collections to the list:
First off, old computers, naturally.
I also collect stamps, with a particular emphasis on revenue stamps
I collect old documents with revenue stamps on them. This is why I have
around 40 or so 1860's mortgages, all of them have revenue stamps on them.
Along the same lines, I have an 1885 license to sell manufactured tobacco.
I also collect various mediums for recording sound. I have a CD player,
cassette deck, several turntables, a Rio, multiple reel to reel tape players
(one of which is run by vacuum tubes), and a few 8 track decks. No wax
cylinder player yet, unfortunately.
I also have, as my secondary refridgerator, a 1952 westinghouse frostfree
refridgerator, which still works great. I've started collecting vacuum tubes
as well. I also collect classic cars, to which end I have a 1967 Plymouth
Barracuda and a 1970 Oldsmobile Cutlass S. I also would like to get a couple
of old tractors at some point. I also have a whole bunch of random car parts
which don't go to any car I have ever owned (my honeywell lineprinter is
sitting on a stack of Corvair rims in my garage). I'm sure I collect other
weird stuff, but thats all I can think of currently.. oh wait, coins also.
Will J
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I couldn't agree more. I can't stand people who will gladly destroy a
computer as classic as an IBM 1130 for the gold. There are some things that
are more important than money. (To us, anyway.)
>Maybe its just my personal sensitive spot, but cutting up a IBM 1130 for
>gold makes me what to flay somebody.
>
>
> You're right. I meant to add that the solder that I'm using is a very
> low temperature solder with silver in it. 500 or 600 degrees would be too
> cold for standard solder. I love this silver stuff, it expensive but it
> flows beautifully. Most of the stuff that I work on is tiny so a one ounce
> roll will last for a couple of years.
Eh? Silver solder is certainly very nice, flows well, bonds to a lot of metals,
etc., but isn't it usually _higher_ melting point? Conventional solder melts at
around 450 F, I think. (Anyone have the exact figure?), silver solder typically
at 600.
Philip.
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On Dec 3, 16:11, Truthan,Larry wrote:
> My Point would be that the ABSENCE of option jumpers on pin headers
usually
> defaulted to immediate start.
> If you see an option jumper on the RZ56 other than SCSI ID. Would it
hurt
> to pull it?
Dunno. But those DEC drives are rebadged Connors, and the Connor norm was
to have link-present = auto-spinup. For example, on an RZ25, which is the
only one I know for sure DEC didn't disable the option on, you fit a jumper
on J6 position 2 to enable auto-spinup.
I also know this doesn't work for RZ23s or RZ24s.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
I have a 1986 IBM laptop computer that I am interested in selling.
Purchased by requirement from Harvard Business School. Please contact me
with your offers.
On Dec 3, 16:08, Carlos Murillo-Sanchez wrote:
> Tony Duell wrote:
> > Another warning. There's a stuff called 'silver solder' used by
> > engineers. This is _NOT_ the same stuff at all -- it's high melting
point
> > (you can use it on small steam engine boilers, etc). I'm not sure it
even
> > contains silver.
>
> I believe it does contain silver indeed. It is _very_ expensive.
> And you need acethylene+O2 in order to use it.
Not usually; the whole point of most silver solders is that they have a low
melting point compared to, say, brazing alloys, and can be used with a
butane or propane torch in air.
The cadmium-free ones, though, are used because they don't adversely affect
other materials (eg titanium) and they have rather higher melting points,
similar to brazing alloy or even higher.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
On Dec 3, 18:45, Tony Duell wrote:
> That silver-loaded solder is great stuff. I have a reel that I use for
> SMD work and for repairs on Tektronix 500 series (which use silver-plated
> ceramic terminal strips). It was expensive, but it lasts a _long_ time.
>
> Another warning. There's a stuff called 'silver solder' used by
> engineers. This is _NOT_ the same stuff at all -- it's high melting point
> (you can use it on small steam engine boilers, etc). I'm not sure it even
> contains silver.
Oh yes it does :-) "silver-loaded" solder only contains tiny amounts of
silver (about 2%) but "silver solder" usually contains more silver than any
other constituent. EasyFlo is 60% silver, and most are between 30% and 65%
silver. The cadmium-free versions contain more than most: Ag19 is 85%
silver, 15% manganese. So the book says, anyway, I've never felt the need
to put anything that expensive in a blowtorch flame :-)
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
