test-drb May 2004

test-drb@ccmp.vtda.org

244 participants
500 discussions

by cb＠mythtech.net

>It turns out that the boards are >sagging a bit towards the center, so it's just a matter of time before >things begin to go crash. Not sure how soon that might happen, but >this sagging has occurred fairly quickly, or so it seems. The moisture helped, but particle board does just sag over time. But it may be a while before it crashes, and it probably will slip free of the end supports before it actually breaks. I had a particle board shelf over a kitchen sink in my old house. The steam from washing dishes caused the board to sag under the weight of the cookbooks something fierce. I had almost a full 1 foot displacement from the low point of the center to the height of the shelf supports on the sides. The shelf was only 5 feet long, so you can imagine how much of a bow that was. My shelf was screwed into the side supports so it couldn't slip out. Mine bowed within the first year of it being there (when I moved in there was one there that was just as bad, and I replaced it). It stayed bowed for 2 years until I got annoyed at everything falling over from the angle. I then screwed a hook into the shelf, and into the ceiling, and over the course of a few days, pulled the board straight using a chain (I couldn't add another support in the middle because it was in front of a window). With the help of the chain, the board remained almost perfectly straight for the last 2 years I lived there (I was never able to get it exactly straight again and I didn't feel like replacing the shelf again in a place I was renting). So my guess is, you will get a large bow in that board without it breaking. The only fear I would have is the board bowing so much it slips off the end supports and the entire shelf drops. If you can find a way to resupport the middle you can probably stop the bow entirely and it will continue to give you years of happy service. -chris <http://www.mythtech.net>

20 years, 8 months

building an RS-485<->RS422 converter

by dickset＠amanda.spole.gov

I have a need to build a serial converter down here. ISTR RS-422 drivers are something like 26L32s, which we have. What I'm not sure of is what to use for the RS485 end. Any suggestions? Obviously, I'll have to use what's here since we won't see any planes for five more months. Thanks for any pointers. -ethan -- Ethan Dicks, A-130-S Current South Pole Weather at 26-May-2004 22:00 Z South Pole Station PSC 468 Box 400 Temp -79.9 F (-62.2 C) Windchill -113.7 F (-81 C) APO AP 96598 Wind 8 kts Grid 044 Barometer 680.7 mb (10599. ft) Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html

20 years, 8 months

ST6803P datasheet?

by dave04a＠dunfield.com

At 01:23 27/05/2004 +0100, you wrote: >Jules Richardson wrote: >> I have a few of the things (and a whole pile of 68A09 CPUs which also >> seem very hard to find data for). > >The 6809 data sheet should tell you about the 68A09 and 68B09, too. >As for software, there's always "Programming The 6809" by Rodnay Zaks >and William Labiak. Or "6809 Assembly Language Programming" by >Lance Leventhal. Both the the 6809 data sheet, and the Motorola 6809/6809E Microprocessor Programming Manual are available on my web site: http://www.parse.com/~ddunfield/museum/index.html Go to the "D6809 Portable" entry, and then select "Documentation" and scroll down to the "Reference material" section. Regards, -- 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, 8 months

Paging Michael Thompson

by vcf＠siconic.com

Michael Thompson, I can't e-mail you because of a spam filter on your side :( Have you got an alternate address? Please e-mail me (I can receive >from you). -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

20 years, 8 months

Pressed Particle Board Shelving Warning

by pete＠dunnington.u-net.com

On May 27, 0:18, R. D. Davis wrote: > While there's nothing extremely heavy on the shelves - e.g., one shelf > contains a Canon laser printer (the square one with a CX engine), > about 40 full-height 5-1/4" hard drives, an 8" floppy drive and a few > other things, I noticed that some of the items on some of the shelves > appear to be leaning slightly. It turns out that the boards are > sagging a bit towards the center, so it's just a matter of time before > things begin to go crash. Not sure how soon that might happen, but > this sagging has occurred fairly quickly, or so it seems. Perhaps this will reassure you a bit. This happens gradually over time to particle board (we call it chipboard over here), and it probably hasn't happened suddenly -- it's just that you didn't notice until it reached some threshold. The board is very flexible,and it will bend a long way before it gives way. It's very common to see sagging shelves especially where the suports are at or near the ends instead of about 1/4 of the way in (so the forces on each side balance better). It's also very common to see cabinets (chest of drawers, kitchen cupboard standing alone) with sides bowing outwards. I've seen a chipboard shelf sag so much it slipped between the end supports, but rarely seen one snap. For bookshelves, using 5/8" chipboard, a general recommendation is no more than 2'6" between supports, assuming the shelf is about 50% deeper than the books. -- Pete Peter Turnbull Network Manager University of York

20 years, 8 months

Wanted: M9312 ROMs

by aek＠spies.com

here's a fairly complete list of part numbers. bob supnik was looking for the XE etherboot prom a while back if one should turn up -- RL01, RL02 (DL) 23-751A9 RK06, RK07 (DM) 23-752A9 RX01 floppy disk, single density (DX) 23-753A9 RP02/RP03 (DP), Massbus RP04, RP05, RP06, RM02, RM03 (DB) 23-755A9 RK03, RK05 DECdisk (DK), TU55, TU56 DECtape (DT) 23-756A9 TU45, TU77, TE16 Massbus tape (MM) 23-757A9 TS03, TU10, TE10 tape (MT) 23-758A9 RS03, RS04 (DS) 23-759A9 ASR33 (TT), PC05 (PP) 23-760A9 TU60 DECcassette (CT) 23-761A9 RS11, RS64 23-762A9 CR11 card reader 23-763A9 TS04, TS11, TU80 tape (MS) 23-764A9 TU58 DECtape II (DD) 23-765A9 MSCP disk, including UDA50, RAxx (DU) 23-767A9 RX02 floppy disk, double density (DY) 23-811A9 DECnet DDCMP DMC11, DMR11 (XM) 23-862A9 23-863A9 23-864A9 DECnet DDCMP DUP11 (XW) 23-865A9 23-866A9 23-867A9 DECnet DDCMP DU11 (XU) 23-868A9 23-869A9 23-870A9 DECnet DDCMP DL11-E (XL) 23-926A9 23-927A9 23-928A9 DECnet Ethernet DEUNA (XE) 23-E22A9 TMSCP tape including TK50, TU81 (MU) 23-E39A9 proms are: 82S131, Am27S13, 63S241, 74S571 512x4 three-state

20 years, 8 months

ST6803P datasheet?

by rigdonj＠cfl.rr.com

Anybody know where I can find a datasheet for this? I didn't find ANYTHING about the 6803 on SGS-Thomson's website. Joe

20 years, 8 months

Wanted: M9312 ROMs

by pete＠dunnington.u-net.com

On May 26, 21:19, Fred N. van Kempen wrote: > On Wed, 26 May 2004, wai-sun chia wrote: > > So I'll need boot ROMs which supports RA and DU disks. Because my 11/04 used to be an embedded CNC drill controller, in the place of the regular CPU diagnostic is has a weird proprietary program which tries to initialize some long-gone/dead equipment which used to be connected to the PDP. > > > > In summary, I'm willing to pay a fair/reasonable price for the following M9312 ROMs (unless some one has spares, then I wouldn't mind them free of course :-)): > ... > > Although I assume we can all check our systems and boards and come > up with all of these, wouldnt it be much nicer (and cheaper) if you > just get the ROM contents as binary files, which you then plug into > an eprom? Unfortunately they're small bipolar fusible-link PROMs which are hard to get and almost as hard to find a programmer for (unless you're me or Tony). The A9 types are 82S131 (or MMI6306, 75S171, 27S13, 93448, etc) 16-pin DIL 512-words by 4-bit wide, and the F1 types are 82S137 (or TI24S41, MMI6353, 74S573, 27SS33, 93453, etc) 18-pin DIL 1024 words x 4-bit wide. The idea of storing the images is a good one, however. As far as I know you can't get these from DEC/Compaq/HP any more, so I'll host them if anyone has images to add to the collection. -- Pete Peter Turnbull Network Manager University of York

20 years, 8 months

9312 ROM Archiving

by kyrrin＠bluefeathertech.com

Although I'm not collecting computers any more, I still run a large FTP site, and I have the capability to read (and program) all kinds of devices, including bipolar PROMs. I would be happy to donate my services at no cost (well, perhaps enough to cover return mail) in terms of archiving images of the boot PROMs, and making them available for download. All I would need is original (or copied) PROMs to be read and archived, along with a description of which ROM is for what purpose. The original devices would then be returned to whoever sent them. I invite anyone who wants to do this to contact me via private E-mail, and I will set it up. Keep the peace(es). -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- http://www.bluefeathertech.com kyrrin (at) bluefeathertech do/t c=o=m "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"

20 years, 8 months

What's the weirdest thing that you've ever found inside a computer?

by pete＠dunnington.u-net.com

On May 26, 12:28, Fred Cisin wrote: > On Wed, 26 May 2004, Joe R. wrote: > > connectors and gender menders. But I got to wondering what is the strangest > > thing that anyone has ever found inside a computer or similar piece of > > electronics gear. > > folding money in a disused floppy drive? - gives added meaning to > "best price", or "how much would you pay me to take it away?" A penny (a large British one) inside a Commodore PET; it was the cause of the shorted PSU and blown fuse. I've often found extra screws rattling around inside things. Paper clips are pretty common, as are biscuit crumbs and bits of crisp ("potato chips", you colonists call them, I believe). The worst was the dust in an 11/23 I was once called out to fix. It wouldn't boot (which turned out to be because it was overheating). When I slid the cover off the BA11-N, it looked like a large grey brick. I explained to the owners that having it on the floor under the reception desk was perhaps not the best place for this hotel's call logger and billing system. But the strangest must be the 1?" No.8 woodscrew inside an RK05 pack. -- Pete Peter Turnbull Network Manager University of York

20 years, 8 months

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test-drb May 2004