test-drb May 2004

test-drb@ccmp.vtda.org

244 participants
500 discussions

by pete＠dunnington.u-net.com

On May 26, 0:02, Tony Duell wrote: > All the passengers got out of their seats and rushed to see this. > Unfortunately, the uneven weight distribution caused ther plane to roll > over and crash. > > Which illustrates that 'Too many poles in the right hand half of the > plane leads to instabilty' :-) LOL! If you've not already seen them, you'd probably be interested in two pages designed by one of my mentors, who taught me on the digitasl Filter Design course some years ago: http://www-users.cs.york.ac.uk/~fisher/lcfilter/ http://www-users.cs.york.ac.uk/~fisher/mkfilter/ Tony (Fisher) probably knew the joke. He wrote, "I've been advised to say that, although I believe the package to be bug-free, you use the results at your own peril, and you're advised to check them for correctness before using them. Don't blame me if your aircraft falls out of the sky!" -- Pete Peter Turnbull Network Manager University of York

20 years, 7 months

Pressed Particle Board Shelving Warning

by pete＠dunnington.u-net.com

On May 28, 12:20, der Mouse wrote: > >> I suppose the [raised-floor tiles] I am familiar with from the one > >> job I've worked at that used them are atypical, then. They [...] > > I've worked in an office which had those too, so you're not alone. > > They were very tight fitting too, and needed a couple of big > > suction-cups to lift them up. They could take one hell of a weight > > though. > > Matches my experience on all counts. (Though if you start with a tile > with a hole cut in it, so you can get a grip by hand, you don't need > the suction cups. A screwdriver between the tiles can also turn the > trick. On May 28, 12:46, McFadden, Mike wrote: > I have a pile of computer flooring setting in the corner of my garage. > The hospital removed it and I'm hoping to set up a computer room. My > wife keeps asking about when and where. > > Tiles have a black rubber/plastic edge about ? inch wide on all edges. > Center is tile/hard linoleum. Structure is steel with an x pattern > on the bottom. Very heavy. The tracks to support the tiles are metal > channels [...] Mine are high-density chipboard about 45mm thick with zinc-plated steel cladding top and bottom (the steel is pretty thin). The top side is further clad with hard vinyl floorcovering. The sides are beveled to make it easier to lift each one in and out, and have a plastic strip bonded to them to prevent moisture ingress; each corner has a metal plate that helps locate them correctly on the crossheads on the legs. The suports are just over 1" diameter zinc-plated steel with a cast alloy crosshead on the top. They're epoxied to the concrete floor and there are no stringers or stretchers between the legs. They are similar to the Guardian range made by Propaflor, the specs for which you can see at http://www.propaflor.co.uk/public_html/gheavy.htm The ones at work are just like the Guardian Heavy range, with carpet-like material on the top. Mine (at home) and the ones at work are all fitted together so closely that you couldn't really get a screwdriver between them to prise them up. If you're curious about the translation of Newtons to American weights, the lightest range (Propadek, 30mm thick, unclad) on those pages says it can support 1500 Newtons on any single 1" square of the tile -- that's about 330lb. The 38mm version can support twice that. The middle range (Spacedek) claims up to 4500 N, that's half a ton. The Guardian range goes up a bit more, and claims to support almost a ton and a quarter (2455lb) on four equidistant points, each a third of the way in from the corners of the 600mm square tile. > The only problem with the suction cup tile pullers is that picking a > tile up at an angle can result in dropped tiles, they loose suction. If they're two-cup suction lifters, they probably need cleaned. They sometimes get like that when they get grit embedded in them. If they're one-cup versions, they're meant for pulling dents in car bodywork, not floors :-) -- Pete Peter Turnbull Network Manager University of York

20 years, 7 months

IS32 Optic RAM Datasheet and Steve Ciarcia's Micro D-CAM Artical

by dave04a＠dunfield.com

I've just checked my archives, and I have a copy of the original two-part artical, called: Build the Micro D-Cam Solid-State Video Camera Part1: The IS32 Optic RAM and the Micro D-Cam Hardware - Sep 1983 BYTE Part2: Computer interface and Control software - Oct 1983 BYTE I also have a copy of the Micron Technology IS32 OpticRAM data sheet. If anyone is interested, I can scan them and post them for public consumption. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

20 years, 7 months

Pressed Particle Board Shelving Warning

by pete＠dunnington.u-net.com

On May 29, 22:58, Ethan Dicks wrote: > On Sat, May 29, 2004 at 03:41:50PM -0700, Ron Hudson wrote: > > How do you lift the carpet covered ones? Hook velcro on handles? > > I've seen a tool that resembles the suction-cup lifter, but instead of > rubber cups, there are square plates with tiny metal hooks, rather like > velcro. You place the tool on the carpet and slide it in one direction > to snag the carpet, and slide it in the other direction to release it. Ours are a bit like that; there's a lever on the top to slide the two plates apart. The spikes are about 1/4" long. They all seem to be like that; one of ours recently went missing and I contacted a lot of companies to get a replacement. -- Pete Peter Turnbull Network Manager University of York

20 years, 7 months

Computer flooring/flooding/water in computer rooms

by pete＠dunnington.u-net.com

On May 29, 11:09, Patrick Finnegan wrote: > Hmm, this is turning into "who's computer room hasn't flooded?" :-) > Anyhow, > we've had similar problems with the drains from our Leibert A/C units > getting clogged and overflowing Hmm, ours is a Liebert too... -- Pete Peter Turnbull Network Manager University of York

20 years, 7 months

Somebody just got a steal - PDP8a and ASR33

by wacarder＠usit.net

Look what somebody got for $50 on eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4193&item=4134523032& rd=1 - Ashley

20 years, 7 months

Pressed Particle Board Shelving Warning

by pete＠dunnington.u-net.com

On May 27, 8:54, Paul Koning wrote: > I have had a particle board bookshelf come apart. The blame was in > part on incompetent design ("scandinavian design" pretty looking > stuff) -- the shelf was "supported" on a groove milled in the edge. > That means the load was carried on less than half the thickness of the > shelf. Presumably it sagged, and the ends came away from the sides? I've seen that happen. Bad design -- either an inappropriate design for the material, or an inappropraite material for the design, depending on your point of view :-) I think US building rules say that particle board (or its various > analogs, such as OSB -- I still call that particle board) are not > allowed for load bearing applications such as floors. Those must be > plywood. And personally I view any house built with particle board > *anywhere* (even where it's permitted) as cheap construction. > > So I'd say that you should never use particle board to carry loads. Manufacturers of computer room raised floors will disagree with that -- all the high-load ones I've ever coma across are made of particle board (usually with a very thin metal cladding, which is to protect against moisture and impacts, and to provide electrical continuity). Of course, these are 35mm-45mm thick, not 15mm-18mm. -- Pete Peter Turnbull Network Manager University of York

20 years, 7 months

Computer flooring/flooding/water in computer rooms

by technobug＠comcast.net

Back when I was running a ground station using a Modcomp, the Modcomp tech came by for scheduled service and told me about a service that he had just performed at an aluminum smelter. Seems they used the beasties for controlling the anodic smelting process and placed the computer right next to the smelter. Inorder to protect it from the heat they put the crates in a large NEMA box and piped cooling water to a radiator in the box. When he arrived he sucessfully ran the system checks from the console and then opened the box to find the entire thing was full of water. Seems they were very concientious about using deionized water in their cooling systems and no harm was done. Other than having to dry everything out, he had to replace forty-some fans in the unit, reseat all the chips (hundreds - everything was socketed) and of course repair the cooling radiator. CRC

20 years, 7 months

searching for manual

by Stoebass＠t-online.de

Hi everybody, I have a Busicom 141-PF and a Busicom 121-DK. Does anybody know where I can get a copy of a manual ? Thanks and Kind regards Christian

20 years, 7 months

mostly Qbus stuff - equipment

by pete＠dunnington.u-net.com

On May 28, 15:11, Zane H. Healy wrote: > > At 5:37 PM -0400 5/28/04, Ed Kelleher wrote: > > >a guy who as a public service has posted old manuals on his site. > > > > > >http://www.miim.com/documents/dilog/ > Again, nothing against Ed, but... > > The owner of that website is also a total A** **** about people linking to > his site. Link to his site and you'll probably find that any traffic > following that link gets redirected to an obscene website. Several people > have had *very* unpleasent dealings with him. So have I. And posting manuals in Word format? Come on! > I'd personally recommend sending any scans to Al for bitsavers.org. Hear, hear. -- Pete Peter Turnbull Network Manager University of York

20 years, 7 months

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test-drb May 2004