test-drb June 2005

test-drb@ccmp.vtda.org

221 participants
681 discussions

by ajp166＠bellatlantic.net

> >Subject: Re: OT: EMP and Equipment > From: jim stephens <jwstephens at msm.umr.edu> >EMP as related to an atmospheric nuclear explosion is caused because >of the release of energy from the atmosphere ionized by the radiation >pulse sent by the blast. Radiation as in Energetic Particles or as Waves like EM? >when the ionized gases recombine, they release a huge amount of radio >frequency radiation in a pulse. This causes any junctions to have >induced a potential across them, unrelated to being plugged into anything. That pulse wouldn't happen to be ELECTROMAGNETIC would it? >This is similar to the damage from static electricity, but is not related >to >direct conduction and release of potential to ground, which static >usually is, but is rather induced potentially deep inside any devices >however well shielded. Your confusing netrons and gamma particles that go through most everything to Electromagnetic waves that don't. Faraday shield will stop or suffifiently attenuate EM waves. >The only way to guard against this is to engineer all junctions and >circuits to withstand and survive this potential. That makes stuff resistant. >This is also the reason that vacumn tube circuits recover faster or at >least they should, if the circuits don't get damaged by a sudden jump >in potential passing thru them and settle back down. They don't have >solid state junctions to be damaged permanently in such an event, and >in theory should settle back to original function. Wrong in part. Tubes are more resistant as anything that nominally operates with hundreds of volts is less likely to be terminally affected by a 20V spike. However a piece of logic that runs on 5V will be totaled with even a 1V spike. >note that satellites in orbit, or airborne aircraft can be equally at >risk to EMP. Yes they are. At least the electronics will be. A C150 flying behind a real honest to dog Slick magneto won't even notice it. However Sats die not only from the EM fields from solar storms they also suffer from the ionizing radiation that literally posions the silicon and it's doping. >Note that the high potential caused by lighting is mostly caused by >conduction, not by the field of the bolt. It is an excess of electrons >looking for a path that cause the damage there. Really wrong! While that is the primary damage path it is far from the only path. Near hits are a danger due to the EM field resulting. I have a computer that was damaged by EMP from a direct hit to the house I was in at the time. It was not connected to power or terminal. The damaged chips were near the physical edges close to openings as the case (NS* horizon with wood cover) was not 100% enclosure. The terminal (an H19) was totaled. It too was no cables connected and line cord laying on the ground. Another machine in the house that was connected was totaled. A portable battery operated common 6 transistor AM radio was cooked, mixer/osc transistor connected to internal loopstick antenna was shorted(that's a magnetic loop!). Remember in an intense EM field any wire is the load side of a transformer (or field of a generator) and the connected circuits have to dissipate the power induced in that winding. > Nuke EMP is from the radiation pulse and is effective far from >the point of the blast, which is why it could be an effective >threat over hundreds of miles distant. Even then inverse square law says no, not that far. Check the various studies done with the Nevada desert blasts and out in the Pacific. Military field radios are EMP resistant. Ever look at field radios? They have everything going in or out through connectors, when connectors are unplugged there are conductive caps placed over the connector and the cases are all continous conductive including closeable covers on things like speakers. This is partially to protect against handeling and environment but also EMP. If "you" a user are far enough away to survive without ill effects likely those radios will. The key is anything too close is at risk. Distance is safety. For known cases, Hiroshima, Nagasaki, Pacific Islands that safe distance only a few miles from ground zero. This does not include radioactive fallout and it's longer term poisoning. Further in the desert where thy did underground blasts for years at the top of the hole were older computers with CORE memory that were subjected to both EMP and physical shock waves. Usually the system was trashed due to the trailier being tossed around but, the cores would be pulled and read if the machines were too mechanically damaged. Fact, bombs are bad. Being close to them is very bad. Allison

20 years

S100 PROM boards

by ajp166＠bellatlantic.net

> >Subject: S100 PROM boards > From: "Cini, Richard" <Richard.Cini at wachovia.com> > Date: Fri, 10 Jun 2005 16:09:44 -0400 > To: "'General Discussion: On-Topic and Off-Topic Posts'" > <cctalk at classiccmp.org> > >All: > > > > With my two new machines I want to get a PROM monitor in them so >I can start really playing around with them. I have a single Vector RAM/PROM >III board, which uses 2704 or 2708 EPROMS. Most of the chips I have are 2732 >or larger. > > > > Before I go slogging through the manual to try to hammer a 4k >chip into a 1k socket, does anyone have any experience making this mod? >Alternatively, can someone recommend a good general PROM board that can use >larger EPROMS (programming feature not necessary). I'd build a board, it's fairly trivial. Compared to the mods needed to make a 2708 board take 2732s. There is one easy way and thats to make a header that takes the 2732 and maps the Data/Address/CS-/OE- pins to the 2708 socket along with power and ground. That will allow only using 1k of the 2732 but that may be all you need. the upside is one 2732 can hole 4 1k programs and it's easier to program than 2708. Allison

20 years

Apple Goes Intel...

by msokolov＠ivan.Harhan.ORG

Fred Cisin <cisin at xenosoft.com> wrote: > Thank you, Michael, for clarifying that Apple's choice to go Intel > is NOT an engineering, NOR a marketing decision, > but is in reality an intergalactic conspiracy. I made my post in response to Eric's comments regarding DRM and Richard Stallman's prophetic "Right to read" story, not in response to Apple's choice to go Intel. I couldn't care less about what CPU Apple uses - that's utterly insignificant on the cosmic scale. Technology changes, but the epic struggle between good and evil, between Light and darkness, and between freedom and tyranny stays the same. MS

20 years

Data formats was Re: Rescue of data from Pioneer 10 & 11 tapesatJPL needed.Vintagecomputers slated for demolition.

by dwight.elvey＠amd.com

>From: "Randy McLaughlin" <cctalk at randy482.com> > >From: "Paul Koning" <pkoning at equallogic.com> >Sent: Friday, June 10, 2005 12:51 PM > > >>>>>>> "jim" == jim stephens <jwstephens at msm.umr.edu> writes: >> >> jim> I have met these people and visit with them every year at the >> jim> JPL open house, and this is most certainly not the case. The >> jim> data division is very serious about conserving the data, and >> jim> they would do anything they can to convert it. >> >> So does that mean the Planetary Society article that started this >> whole thread was just a fund raising scam? >> >> paul > > >I would call scam over stated, I am sure it is a "scheme". > >Revenue generation is a serious business, everyone has seen pictures of >starving children in Africa. This is necessary to get the $ rolling in. >They never point out that after administration fees and the "help" of local >officials just a tiny percentage helps anyone. > >If people donated $100,000,000.00 to help with the data recovery who >believes that one $0.01 would every get used to recover any of the data, not >me. The money would end up on other projects that never get off the ground. > >That's just the nature of most "charitable" contributions. > >Personally I donate to charities but I check them out first, being a well >known name doesn't guarantee anything. > Hi I would suspect that it is the writer of the article that has simply taken bits and pieces of what was said and made a "STORY" out of it. It wouldn't be the first time. They were most likely looking for more funding but that doesn't make a "STORY". Dwight

20 years

Fwd: [GreenKeys] Rock and Roll Teletype 'experts'

by drb＠msu.edu

> Hmm, what's the little bit in the red strip? Must look at that > later... I can't get it to make sense, regardless of which way I interpret colors as punch or no punch, and which order I read the bits. De White=0, Black=1 00001 E T 00000 nul nul 11011 FIGS FIGS 00000 nul nul 11000 9 - 11000 9 - 11001 ? 2 11001 ? 2 11000 9 - 00011 - 9 10111 1 / 10111 1 / 00001 3 5 00001 3 5 00000 nul nul 00000 nul nul 11111 LTRS LTRS 11111 LTRS LTRS 01111 K V 11101 X Q 01011 J G 01011 j G 11111 LTRS LTRS 00011 A O 11000 O A 00000 nul nul 00111 U M 00011 A O 10011 W B 11000 O A White=1, Black=0 11110 V K 11111 LTRS LTRS 00100 SP SP 11111 LTRS LTRS 00111 U M 00111 U M 00110 I N 00110 I N 00111 U M 11100 M U 10111 Q X 10111 Q X 11110 V K 11110 V K 11111 LTRS LTRS 11111 LTRS LTRS 00000 nul nul 00000 nul nul 10000 T E 00010 LF LF 10100 H S 10100 H S 00000 nul nul 11100 M U 00111 U M 11111 LTRS LTRS 11000 O A 11100 M U 01100 N I 00111 U M

20 years

Apple Goes Intel...

by dwight.elvey＠amd.com

>From: "Vintage Computer Festival" <vcf at siconic.com> > >On Thu, 9 Jun 2005, Fred Cisin wrote: > >> Thank you, Michael, for clarifying that Apple's choice to go Intel >> is NOT an engineering, NOR a marketing decision, >> but is in reality an intergalactic conspiracy. > >I'd honestly rather have Michael for President than anyone currently in >Washington. > Hi I agree with that but he doesn't seem to understand that someone needs to have incentive to make toilet paper. This requires the thing that he hates, contrast. Dwight

20 years

Seeking BBC Domesday system

by williams.dan＠gmail.com

> For all of our critical space-flight hardware (power supplies, plasma > instruments, etc.), we put them in well-padded containers and carry > them onboard. We draft letters to airport security (and carry > duplicates thereof) quoting the NASA contract number and giving > contact phone numbers at the SwRI office. In many cases, neither > X-rays nor opening the contamination bag is a good idea. With the > appropriate groundwork, we have not had any problems (knock on wood) > so far. > > So it is *possible* to carry electronics on planes, under some circumstances. > > The clever instrument teams make sure their containers don't fit in > coach seats, so they have no choice but to go First Class. :-) > -- > - Mark > 210-522-6025, temporary cell 240-375-2995 > That makes it much easier all Sellam has to do is find a Domesday system, convince them to ship it. Then get a Nasa contract number to make sure it gets there. It might be easier to build his own ;) Dan

20 years

LF: DEC power supply schematics

by kirk＠ba23.org

Hello, Does anybody know where I can find the schematics for the following DEC power supplies? TIA. - H7822 from a BA42-B - H7868 from a BA213 - H7864 from a BA23 -- Kirk Russell <kirk at ba23.org> http://www.ba23.org/ Bridlewood Software Testers Guild Ottawa Ontario Canada

20 years

Fwd: [GreenKeys] Rock and Roll Teletype 'experts'

by drb＠msu.edu

> Clever use of Baudot code on an album cover - fascinating information > from "experts" on the origins of it - I bet none of us knew that ITU > 1 was "...used in Teletype machines in the late 1800s." > > http://news.yahoo.com/s/ap/20050609/ap_en_mu/coldplay_album_cover Never mind the bollo..., er, I mean character set. Or the history. It's the bit patterns. I get "X FIGS 9 6", not "X FIGS & LTRS Y". http://www.coldplay.com/img/squares.gif De

20 years

Altair 8800b received

by rcini＠optonline.net

All: Today I received the Altair 8800b that I won on eBay last week. I honestly say that this is the first machine that I'm honestly afraid to plug in. It was billed as "working but in need of a good cleaning" which is an understatement. The interior is filled with greasy dust. Among the other atrocities buried therein: * two bus connectors (out of 10) have destroyed pins * poor repairs/lifted traces on the display control board * repairs on the other boards (CPU and two memory boards) in need of a solder reflow * the main filter cap was replaced with two smaller (but equivalent uF) caps which were unsecured, banging around the inside. These broke one of the card supports. * the top cover has three 3/16" holes drilled into it I've asked the seller to give me a rundown of the history of the machine if he knows it. On a positive note, the switches appear to be intact and the panel graphics seem to be OK. Now, I remember someone asked me to look at the CPU board for some sort of identification. The CPU board has the following designation: "MITS 8800b CPU REV 0". For those who keep track, this unit is labeled SN#5400280K. Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/

20 years

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test-drb June 2005