test-drb August 2001

test-drb@ccmp.vtda.org

295 participants
726 discussions

Paint Curing WAS:Re:Room for Collections

by pete＠dunnington.u-net.com

On Aug 27, 10:36, Pete Rickard wrote: > > "Iggy Drougge" <optimus(a)canit.se> wrote: > > The device in the kitchen for baking small spray-painted articles > > can be used for pizza and muffins. [Pete Turnbull] > I read in Electronic Musician, or some similar mag, of a way to get a > professional enamel finish on metal 19" rack plates: the author said > to place the spray-painted piece into an oven set at 200 deg F, turning > off the heat after closing the door. Do you have any experiences on > getting a smooth, durable finish, etc. ? As an aside, real "stove enamel" is a ceramic, fired onto the surface of steel. "Enamel paint" gets its name because it was supposed to be nearly as durable (though it isn't, of course). Professional sprayers do "stove" or "oven" the paint to improve the hardness; on cars, they use a temperature of about 70deg C (which is about 160deg F) -- much higher can damage the electronics -- but for small parts I use a bit more, around 80deg C. It does make the finish tougher, but it won't improve poor visual finish significantly. It just hastens the drying process, which otherwise would take several days to be complete. Of course, all this only applies to cellulose paint. -- Pete Peter Turnbull Network Manager University of York

24 years

Paint Curing WAS:Re:Room for Collections

by mcguire＠neurotica.com

On August 27, Pete Rickard wrote: > I read in Electronic Musician, or some similar mag, of a way to get a > professional enamel finish on metal 19" rack plates: the author said > to place the spray-painted piece into an oven set at 200 deg F, turning > off the heat after closing the door. Do you have any experiences on > getting a smooth, durable finish, etc. ? I have done this on those nice cast-aluminum Bud chassis. It works well. Be careful not to over-heat them, though, and check them frequently. The 50's style "crinkle finish" can be achieved by evenly preheating the metal in an oven to a slightly higher temperature (250-300 or so) and then applying the paint. Ham operators have been using these techniques for homebrew equipment for many years. -Dave -- Dave McGuire Laurel, MD

24 years

Are office people really that, umm shall we say...slow?

by DAW＠yalepress3.unipress.yale.edu

! ... Perhaps I should have said that there's a real card in ! every slot. No ! blanking plates only. Ah-ha! Trick questions in this quiz! I should've know that! :-) ! > So, how did we do? ! ! Well, I am impressed people have guessed the hard disk ! controller (it was ! one of the obscure ones). On the other hand, some of the incorrect ! guesses would let out magic smoke... Well, like someone else said, we would have done much better if we had the box in front of us, even without opening it. Also, I would not have hooked anything up without first finding out what ports were what... (Gotta preserve the magic!) --- David A Woyciesjes --- C & IS Support Specialist --- Yale University Press --- mailto:david.woyciesjes@yale.edu --- (203) 432-0953 --- ICQ # - 905818

24 years

[rescue] Re: Solbourne VME Boards

by mcguire＠neurotica.com

On August 27, Zach Malone wrote: > I managed to find the silk screened board name on the Keurikon board. Its > an HK68/V10. > "HK68 68000 128K UNIX ?? 84" > Quoted from > http://www.classiccmp.org/mail-archive/classiccmp/1997-05/0519.html > So it is in fact a SBC. I don't have a clue as to why it is inserted in the > Solbourne box, it is of the era of the Solbourne date wise (the Solbourne > 5/600 I have has November 1990 stamped over its original label of 1988, the > HK/68 was originally built in 1984, and mine is copywrite 1989). You > originally found the machine, any clue as to what governmental branch it was > originally under? It was in use at DISA. -Dave -- Dave McGuire Laurel, MD

24 years

[rescue] Re: Solbourne VME Boards

by Diff＠Mac.com

I managed to find the silk screened board name on the Keurikon board. Its an HK68/V10. "HK68 68000 128K UNIX ?? 84" Quoted from http://www.classiccmp.org/mail-archive/classiccmp/1997-05/0519.html So it is in fact a SBC. I don't have a clue as to why it is inserted in the Solbourne box, it is of the era of the Solbourne date wise (the Solbourne 5/600 I have has November 1990 stamped over its original label of 1988, the HK/68 was originally built in 1984, and mine is copywrite 1989). You originally found the machine, any clue as to what governmental branch it was originally under? Zach ----- Original Message ----- From: "Dave McGuire" <mcguire(a)neurotica.com> To: "Zach Malone" <Diff(a)Mac.com> Cc: <rescue(a)sunhelp.org> Sent: Monday, August 27, 2001 3:02 PM Subject: Re: [rescue] Re: Solbourne VME Boards > On August 27, Zach Malone wrote: > > Heurikon sold a lot of 680x0 based SBC VME cards. Upon furhter thought, I > > would imagine that it is a 680x0 computer and the 4 VME boards which have no > > external ports are all RAM. > > Sure, but why would there be a 68K SBC in the VME I/O backplane of a > Solbourne server? > > -Dave > > -- > Dave McGuire > Laurel, MD > _______________________________________________ > rescue maillist - rescue(a)sunhelp.org > http://www.sunhelp.org/mailman/listinfo/rescue

24 years

Tek 465 as a hobby scope?

by mcguire＠neurotica.com

On August 27, Dan Linder wrote: > Yes, the mental discipline I have. Here is the situation: > > grad student + beginning of the year(books, fees) + mortgage on own place > = no scope. :( Ahh, that's why I didn't go to college. I like money far too much. :) > The pricetag on this 465 was the real selling point. I shall lement this > for many days. So... anyone besides tek? I've always used Tektronix > scopes (well, a few heathkits too) and have always been impressed, but > I've never used anyone else's. HP makes good scopes...but Tek is really the one you want, IMO. -Dave -- Dave McGuire Laurel, MD

24 years

Tek 465 as a hobby scope?

by mcguire＠neurotica.com

On August 27, Dan Linder wrote: > Alas - I lost out on it. The Fates decided it should not be so. Very bad news... :-( > For the future, what are some good scopes (sort of in the Tek 465 > quality/feature range)? Tek 453, 454, 465, 475...453/454 has a smaller CRT but is very sharp and nice...If you can afford a newer scope, many of the 22xx family are cheaply made (still good, but not the same quality as the older scopes)...the 24xx are VERY nice. I used a 2445 at work about ten years ago; I loved it. I picked up a like-new 2465A on eBay for about $1100 a few months ago, from a reputable dealer with a warranty. It is a truly wonderful scope. If portability isn't a concern, the 7000 series mainframe-based scopes are of very high quality, and the plugins are very easy to find. You can even get things like spectrum analyzer and logic analyer plugins for them. I like the 7704 and 7904...the second digit is the bandwidth (7904 is like 500MHz if memory serves) and the last digit is the number of slots for plugins...the 4-slotters can generally take two horizontal and two vertical plugins. The spectrum and logic analyzer plugins take up two or three slots. The displays are nice and sharp, and the construction is solid...just keep the plugin contacts clean. > This results from me not taking money to a HAMfest - trying to curb my > spending, since i never find anything great - until the scope that I lost > out on. Call me opinionated (hell, who wouldn't!) but mental discipline is the answer here...alwyas bring as much money as you can, and if you don't find a killer deal, let your MIND keep you from spending...not the absence of cash. Of course, developing that level of discipline is difficult. I *always* leave a hamfest with an empty wallet. 8-) -Dave -- Dave McGuire Laurel, MD

24 years

Just curious about injection molding or casting

by Robert_Feldman＠jdedwards.com

Yes, model railroaders sometimes make molds (usuall using silicon RTV) and castings of small parts. Check your local hobby shop or www.micromark.com (also a good source of small tools for the hobby). -----Original Message----- From: McFadden, Mike [mailto:mmcfadden@cmh.edu] Sent: Monday, August 27, 2001 12:28 PM To: 'classiccmp(a)classiccmp.org' Subject: RE:Just curious about injection molding or casting Plastic/metal replacement computer parts, I'll bet the train hobbyists have some knowledge about recreating metal/plastic parts for computers. I have seen articles about how they have created/machined/cast entire trains from raw materials. Pointer to site for manufacturer of miniature machine tools. http://www.sherline.com/ Mike mmcfadden(a)cmh.edu

24 years

Okay, not exactly within timeframe for classic, but...

by mbg＠world.std.com

does anyone know how to tell if an I-Opener is of the kind which can be hacked? Can one tell from the serial number of does the machine physically have to be opened? Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

24 years

Solbourne VME Boards

by mcguire＠neurotica.com

On August 27, Zach Malone wrote: > first board is labled Heurikon on both of its tabs, and has the following > lables over its connectors: Serial, FPI, FMS 1 2 3 4 (over a set of LEDs), > reset, and SCSI. It seems to be a Motorola M68000 board of some sort as it > has two small chips on it which are labled MC68000R10 and MC68450RC10, with Not sure what this one is...likely a SCSI host adapter but perhaps more. The 68450 is a DMA controller. > further markings below them. Board number two is a 6U VME card with 4 large > AMD branded chips on it, and two sub boards which lie flat on the VME card, > it has a 10 pin plug on the back (just pins, it is 5x2) which extends from a > daughter card which has an AMD chip labled Am29000 - 16GC, a minidin > connector, 2 small LEDs, and then 4 large bulb like objects, which are > alternatingly black, and red, the connectors for those are labled AT&T. I This is a FDDI interface...Interphase 4211, most likely. The bulblike objects are rubber covers over ST fiber connectors. > then have 4 boards which are covered with chips, the majority of which are > TI or Philips (?) branded. The ones which are in sockets have MX07?? or > MX7?? (with ? representing any number) on them. These boards have no > external connectors, nor back plates. Finally, I have a board with the Not sure what this one is. > Solbourne logo on one tab, and MUX on the other, and it then has 3 50 pin > cables along the rear. It seems highly likely to me that this is a Xylogics > 781 16-port MUX. That sounds correct. -Dave -- Dave McGuire Laurel, MD

24 years

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test-drb August 2001