test-drb December 1999

test-drb@ccmp.vtda.org

186 participants
742 discussions

VMS 4.7 was VAXstation 3100 history (Was ... different)

by dburrows＠netpath.net

>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

25 years, 4 months

RZ56 Help needed

by allisonp＠world.std.com

<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

25 years, 4 months

Solder Problems (PDP-8/m related)

by pete＠dunnington.u-net.com

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

25 years, 4 months

Whats the screwiest thing you collect?

by xds_sigma7＠hotmail.com

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 ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

25 years, 4 months

Everyone here should read this.. I thought I'd seen everything.

by mrdos＠swbell.net

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. > >

25 years, 4 months

Solder Problems (PDP-8/m related)

by Philip.Belben＠pgen.com

> 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. This E-mail message is private and confidential and should only be read by those to whom it is addressed. If you are not the intended recipient, you are hereby notified that any dissemination, distribution, copying, reproduction, modification or publication of this communication is strictly prohibited. Please delete the message from your computer and destroy any copies. This message is not intended to be relied upon by any person without subsequent written confirmation of its contents. This company therefore disclaims all responsibility and accepts no liability of any kind which may arise from any person acting, or refraining from acting, upon the contents of the message without having had subsequent written confirmation. If you have received this communication in error, or if any problems occur in transmission please notify us immediately by telephone on +44 (0)2476 425474

25 years, 4 months

RZ56 Help needed

by pete＠dunnington.u-net.com

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

25 years, 4 months

No subject

by DerrickW＠ForestInvestment.COM

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.

25 years, 4 months

Solder Problems (PDP-8/m related)

by pete＠dunnington.u-net.com

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

25 years, 4 months

Solder Problems (PDP-8/m related)

by pete＠dunnington.u-net.com

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

25 years, 4 months

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test-drb December 1999