test-drb November 2010

test-drb@ccmp.vtda.org

162 participants
241 discussions

by tshoppa＠wmata.com

> I am looking for info on a Gandalf LDS120 modem, specifically the serial port pinout. I recall it's just 2, 3, and 7, i.e. no hardware flow control, and probably not even DTR/DSR. Now whether 2 and 3 have to be swapped...well I always just tried it both ways until it worked :-) And it's 4-wire leased line on the analog side, right? So no ring detect etc. either. Tim.

13 years, 9 months

Any ideas what chip goes in this socket?

by ard＠p850ug1.demon.co.uk

The device [1] that's currently all over my bench has an empty 28 pin DIL socket on one of the PCBs. It's alongside a 27C256 EPROM and 43256 RAM, and has a similar pinout. In fact the pinout is the standard JEDEC one for 28 pin memory devices (with A13 on pin 26, WE on pin 27, OE on pin 22, etc) with one exception. Pin 1 is not A14, it appears to be an output, linked to an interrupt pin on the 80C85 that links to the aforementioned memory devices and this socket). Oh, and to an input port pin. Any ideas? My first thoughts were an E2PROM or simular, with a ready output on pin 1, or a RTC/memory device with an interrupt output on pin 1, but I can't find any obviuos candidates. [1] A telephone network simulator. OK, it's not a classic computer, but I will be using it to test and demonstrate classic computer modems, it's well over 10 years old, and contains 6 microprocessors... -tony -------------------------------------------------------------------- myhosting.com - Premium Microsoft? Windows? and Linux web and application hosting - http://link.myhosting.com/myhosting

13 years, 9 months

Gandalf

by two_bit_mem＠yahoo.ca

Hello I am looking for info on a Gandalf LDS120 modem, specifically the serial port pinout. TIA Marty

13 years, 9 months

FFS Sun monitor

by rdawson16＠hotmail.com

Its large and heavy 19" ... Works fine with vga at hi res,and has attached cables for the sun. Its going to the recycle unless you guys want it. Randy

13 years, 9 months

Weird discussions, was Crucifixion (was Re: Fragility in the floppy world (was Re: TRS-80 Model II Manuals))

by dm561＠torfree.net

Date: Mon, 8 Nov 2010 08:28:03 -0800 (PST) From: Cameron Kaiser <spectre at floodgap.com> Subject: Re: Weird discussions, was Crucifixion (was Re: Fragility in the floppy world (was Re: TRS-80 Model II Manuals)) > > I once dated a girl who was a DEC geek (she grew up > > around PDPs), and she wanted to have, erm, "physical > > relations" atop my VAX 8700. > > Now we know the "real" reason the Cray-1 was C-shaped. > > A whole new classification of computers! > > - if you can have physical relations inside it, it's > a mainframe > - if you can have physical relations on top of it, > it's a mini-computer > > - if you can get involved with someone who would > like to test those characteristics you're amazingly > lucky Dr Pepper -> keyboard +++++++++++++++++++++++++++++++++++ Not to brag, but in my experience the Cray-1 would be much harder to find (and maybe more desirable in the long run...)

13 years, 9 months

Virtual memory

by roger.holmes＠microspot.co.uk

> From: Dave McGuire <mcguire at neurotica.com> > >>> I'm not familiar with the B5000 implementation (did I miss it in the >>> thread already?), but I did try to avoid restricting the def to that >>> of paging. >> >> The B5000, circa 1961 was an amazing bit of equipment. Read about it >> here, then compare with later systems. >> >> http://www.ajwm.net/amayer/papers/B5000.html The above says the first delivery was in 1963. I believe that is the date which matters. Ideas and plans for computers are around for a long time before they come to fruition and can maybe be traced back for many years but the one date you can rely on is when a customer accepted a machine as working to its specification and paid for it. According to: http://www.chilton-computing.org.uk/acl/literature/news/1962.htm the Ferranti Atlas was working at Manchester University in 1962. I understand it had virtual memory. I wouldn't have wanted to pay for the quarter megawatt electricity bill !

13 years, 9 months

Backups in the modern world

by jonas＠otter.se

Tony Duell wrote: > The classic case of that is a demountable hard disk with headcrash > problem. It will damage any disk inserted into it, and those damaged disks > will then casue headcrashes on any other drive they're tried im. > Some indiots end up damaging every head and disk in the building.. That actually happened to a friend of mine years ago. He is/was far from an idiot, just unlucky. The first headcrash was silent, so he did not realize there had been one, put the pack in another drive, went on to copy another pack and moved that one to a third drive. By that time, the first pack had started to destroy the second drive, as witnessed by nasty sounds coming from it. But by then it was too late, the other drives started making nasty noises as well, and 60 heads and three packs had been destroyed. DECs entire stock of replacement heads was exhausted at once and they had to wait for a week while more heads were shipped in and the techs worked repairing the drives. A whole department of programmers was idle for a week. And as I said, the damage wasn't noticeable until after a little while when it was too late. /Jonas

13 years, 9 months

AlphaServer 2100

by pontus＠Update.UU.SE

On Mon, Nov 08, 2010 at 11:38:56AM +0000, Peter Coghlan wrote: > If it is not possible to save them all intact, I would be interested in some > CPU and I/O boards and possibly the backplane and memory boards if someone near > the machines is willing to extract boards and ship them to me in Ireland. I > would of course pay for shipping plus a small bonus to you and to the person > shipping them, whatever you think is appropriate. I can ask, it seems to be a nice enough guy. > As a matter of interest, do you have a ballpark price for shipping the > machines intact? A lowball estimate for _one_ machine to me in Uppsala from Lule? is 1300 SEK, but I suspect it will be closer to 2000 SEK. I'll leave conversion as an exercise for the reader. Regards, Pontus

13 years, 9 months

AlphaServer 2100

by pontus＠Update.UU.SE

Hi I'm guessing the chance is pretty slim, but if anyone in Lule? or close by wants an AlphaServer 2100 pedistal there are three available for free. They are on the way to the scrapper. I would love to pick these up but they are to far away. If anyone near Uppsala would like to share the shipping costs that would be a possibility. Regards, Pontus.

13 years, 9 months

Terak 8510/c Info?

by derschjo＠mail.msu.edu

Hi all - Just got myself a Terak 8510/c workstation, in pretty decent shape. I'm going over it, and preparing to power it up (after testing the power supply). Anyone know any details about this particular model? (And what technical differences there are between the /a and the /c?) There appears to be a good amount of information about the 8510/a, but I can't find a thing about the /c variant. The /c appears to be considerably newer (mine dates from around 1982 and is branded Calcomp on the front), seems to have replaced the single internal 8" drive with two half height 8" drives, and the keyboard and monitor are completely different. A service manual would be extremely helpful -- a few of the double-height QBus cards came loose during shipping and were banging around and I'm not sure yet what the order is supposed to be (I guess I'll have to figure out whether the backplane is serpentine or not... shouldn't be too hard) and it'd be useful to know what the power supply pinouts are so I can test the voltages. And while I'm at it -- has anyone archived any Terak floppies? There's nothing on Bitsavers and I can't find anything anywhere else. Be nice to have some software to run on this thing after I get it running again :). Thanks as always, Josh

13 years, 9 months

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test-drb November 2010