test-drb June 2011

test-drb@ccmp.vtda.org

141 participants
161 discussions

Useless thread, RE:Religion, Re: Nazi System 360/370

by jonas＠otter.se

> [Reasons why I use an RPN calculator snipped] > >> I'm intrigued. I don't understand, but that's OK. > > What don;'t you understand ? RPN, or why I prefer to use it? AFAIK compilers often/usually convert expression to postfix notation (RPN or close) during parsing. Also of course the Burroughs B5000 series and successors (up to B7800 IIRC) were stack machines, using postfix notation internally. At university a calculator was a necessity, I had an HP-25 and I always found that RPN made it a lot easier to keep track of where I was in complex calculations, e.g. when working out the reactance of some series-parallel-whatever network of R, L and C. The equations usually barely fitted on one line of a sheet of notepaper, involved lots of additions, subtractions, divisions and multiplications and conversions between rectangular and polar coordinates, and I did not envy those who used infix calculators. /Jonas

13 years, 6 months

Google Lisa List

by snhirsch＠gmail.com

Does anyone know who owns this list and how to get in touch with them? I joined last month, made about three totally innocuous postings and found myself banned at the next attempt to sign in. Google, in their infinite wisdom, gives you no means to find out if it's a mistake, appeal to the owner, or even get an explanation for why it's occurred! I sent a message to the posting address with no response. I had been given the name of "lowenddan at gmail.com" as list owner, but cannot get any response from that address either. Is there something I should know about becoming worthy of Lisa List membership? Perhaps a secret handshake I've overlooked? I contacted a couple of members privately, and both were utterly baffled as to what the motivation may have been. I'm still operating on the assumption that this is a software glitch or mistake. If I've been thrown off as a deliberate action, then I think it's common courtesy for the list owner to at least explain why this occurred. Steve --

13 years, 6 months

Poqet PC

by va7nt＠telus.net

I would appreciate the info you have on the serial adapter for the Poqet. cheers, Paul

13 years, 6 months

Looking for a MicroVAX II BA123 Front Panel Door

by robert.jarratt＠ntlworld.com

I recently acquired a MicroVAX II in a BA123 (World Box) enclosure. It has cleaned up really well. The only niggle is that I am missing the little door that goes over the front panel at the lower left of the enclosure. Does anyone have one of these going spare? Regards Rob

13 years, 6 months

What Is It With Mains Filters?

by tshoppa＠wmata.com

> All the PSUs that have had components pop on me have all been capacitors in > the mains filter (except the H7140 in my PDP11 but that was only after I had > been messing with it to try to fix it, so that doesn't count). > Not being an expert in electronics I am not sure of the reason for this. Can > someone explain? Is it the type of capacitor? Is that type of capacitor only > used in mains filters? If not, why have I (so far) not seen other PSU > capacitors blow up? Not sure how far you're going back but... Mains filters from the 50's and 60's likely had paper/wax capacitors in them. At least in the US, there doesn't seem to have been a special rating system for these but most cap failures were benign (not purely luck... even though there was no special rating they were generally made to be on the robust end.) "Modern" ones (70's onwards) have specially rated X1, X2, Y2 capacitors. In small filters these are likely to be ceramics and in larger ones (especially snubber networks) they are more likely to be boxed film capacitors. They all have special fire protection and surge voltage ratings. They do not necessarily lead "Easy" lives - if some nearby inductive appliance is putting crap into the power line, it's the small devices on the same circuit or nearby branch that may end up eating it. Tim.

13 years, 6 months

Anyone interested in a Gandalf 6' Communication Rack in the Portland area

by innfoclassics＠gmail.com

Picked up the intel 330 and 380 today, thanks Vince. However I think I am not going to keep the rack. It is a 6 foot communication rack mount case with a dark glass door and the Gandalf logo on the front top, on wheels. I could deliver it in the Portland Oregon area on Monday as it is in my van at the moment. I want to keep the rails for the 330 and 380 but can leave the power distributor if whomever takes it wants it. Paxton currently in Portland/Eugene but going back to Astoria on Monday. -- Paxton Hoag Astoria, OR USA

13 years, 6 months

DEC paint color matching?

by chrise＠pobox.com

Has anyone ever tried to color match spray paint to the DEC "taupe" color (ie, the color of the front of a {clean} RL02)? I've got a bunch of stuff now with scratches and rust which I'd like to attempt to touch up or repaint. Is there any sort of standard color code for that DEC color? Chris -- Chris Elmquist

13 years, 6 months

Telequipment S51B Oscilloscope Free to a Good Home

by robert.jarratt＠ntlworld.com

I was given this oscilloscope recently but have since acquired a better one. This is a single channel oscilloscope and contains valves. The trace drifts up and down a bit and it is probably not calibrated either. I have a manual for it too. You just pay the postage. The item is in Manchester, UK. Regards Rob

13 years, 6 months

What Is It With Mains Filters?

by robert.jarratt＠ntlworld.com

All the PSUs that have had components pop on me have all been capacitors in the mains filter (except the H7140 in my PDP11 but that was only after I had been messing with it to try to fix it, so that doesn't count). Not being an expert in electronics I am not sure of the reason for this. Can someone explain? Is it the type of capacitor? Is that type of capacitor only used in mains filters? If not, why have I (so far) not seen other PSU capacitors blow up? Regards Rob

13 years, 6 months

Jack Eisenmann's Duo Adept

by lproven＠gmail.com

The 8-bit computer that?s been built by hand http://www.pcpro.co.uk/blogs/2011/06/17/the-8-bit-computer-thats-been-built… >From the video: [[ The DUO Adept is an 8-bit homebrew TTL CPU + GPU I have designed and built. As a challenge I used only basic kinds of logic chips; no microcontroller or video card. It has a black and white TV monitor and keyboard, and is generally awesome! Oh, and I forgot to mention: I made this when I was a highschooler with no formal education in electronics. :) For more information about the machine, please go to this page: http://web.mac.com/teisenmann/iWeb/adeptpage/menu.html ]] -- Liam Proven ? Info & profile: http://www.google.com/profiles/lproven Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419 AIM/Yahoo/Skype: liamproven ? MSN: lproven at hotmail.com ? ICQ: 73187508

13 years, 6 months

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test-drb June 2011