test-drb November 1997

test-drb@ccmp.vtda.org

126 participants
546 discussions

by dseagrav＠bsdserver.tek-star.net

The CPU *REFUSES* to go to the run state when powered on. Both BAs come on, the DEC power bus is connected. I have the cable correct, it's not twisted... What did I do? Current config: +------+ +------+ | BA #1| | BA #2| | [1] ======= [2] | +------+ +------+ [1] CPU backplane only [2] DD11-CK with the UDA in it. The terminator is in BA #2

26 years, 8 months

One from the 'believe it or not' file...

by jimw＠agora.rdrop.com

You know, I always hate these moral dilemmas... In the last few days the collection received an AT&T UNIX PC (aka 7300, 3b1) in extremely good condition. It arrived with all of the original docs, software, and mouse. The docs were unwrapped , and the mouse was in its original foam packing. "Kind of nice when someone packs things away properly" I thought. Well, its been a bit busy around the garage the last couple of weeks, so I put the unit and its associated stuff on the shelf and covered it up for a time. Last night, while I was working on a notebook (yes, one of those 'modern' things) for one of my wife's friends, I decided to have another look at the UNIX PC while I was waiting for a disk scan to finish... Found a spot for it on the bench, made a cursory check of the unit (nothing loose, nothing rattling...) and powered it up. It hummed and beeped happily and started drawing little boxes on the screen as I recalled it doing when it was starting up... However, about 3-4 minutes and 4-5 lines of little boxes later, it starts to dawn on me that it should not be taking quite this long to get a prompt of some kind. So, I move the keyboard to have a look at the floppy drive (it hides behind the keyboard you see) and sure enough the machine is looking for a floppy. Fine... so, I grab the binder containing the software distribution, open it up... All of the disks are still sealed! At this point it starts to dawn on me, that this machine has never been run! A comment flashes back to mind; made by the person who gave me the machine... "My father bought it for his company, read the manuals and realized that he had no idea what he was doing..." I find myself wondering... Back around 1985 when this thing was released (and about $10k+), who could have afforded to buy one of these things, open the manuals, decide that they were in over their heads, and just put it on the shelf without even loading the software??? EEK! And so, the dilemma... do I open the disks and crank this critter up? Or just pack it all away as another classic 'artifact'? (or leave it until I have a fair amount of time to spend with it) No flame wars please, just the random philosophical question... -jim --- jimw(a)agora.rdrop.com The Computer Garage - http://www.rdrop.com/~jimw Computer Garage Fax - (503) 646-0174

26 years, 8 months

The XT Dilema

by photze＠batelco.com.bh

I've tried replacing the controller, and used another 360K floppy. Now, the monitor stops working :( Does the XT just not LIKE me? Tim D. Hotze

26 years, 8 months

CLASSICCMP digest 241

by allisonp＠world.std.com

<Could someone tell me what exactly "core memory" is? From mentions of Core memory. A system using metal or ferrite(magnetic) material to store data using magnetization. One core, one bit. The direction of magnetic field is key to determining the data stored. <Acoustic delay line? What is that? The principle is that sound(mechanical vibration) moves slower than elctrons. Data, bit are translated from voltages or current to using a transducer resulting mechanical vibration and transmitted through a medium to a like mercury or water to a like transducer where the vibrations are translated back to data. The best example is you see lightening immediately, but sound in air travels about 1100 feet per second. If you time from the flash to the sound you can calculate how far. In solids and liquids sound travels faster but still far slower than the speed of light. So if you put a vibration in to a medium large enough in length there is time before it comes out. So it's possible to put strings of bits in if the medium chosen is long enough as the first one is comming out the last one is in. If you circulate these(with amplification) you now have a memory that is serial in nature and can store information. The name comes from the fact that the first data in will have a finite time delay before it arrives at the other side. The longer the time the more data can transit the space and the greater the storage. There are mechanical and other considerations that limit things. Allison

26 years, 8 months

10 years and change/use it or lose it

by sinasohn＠ricochet.net

At 07:22 PM 11/19/97 +0000, you wrote: >Okay... I started all this stuff... and I'll end it... it *was* a mistake.... >but now, at least we know that until something BIG happens, the 10 yr. definition Or until somebody else new comes along. 8^) --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad sinasohn(a)ricochet.net that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.crl.com/~sinasohn/

26 years, 8 months

So far, so good... Will DD11-CK work in an 11/44?

by dseagrav＠bsdserver.tek-star.net

OK. Now the 44 starts, and I can talk to ODT. I removed all the boards & backplanes except the CPU. There are 2 free preiph slots on the CPU, it's got 1.5M RAM. Now I have to add a second backplane for the DZs and the UDA50. So, I have a new DD11-CK. Will that go in a 44?

26 years, 8 months

10 years and change/use it or lose it

by manney＠nwohio.com

> > > It would be even better if it > > > were easy to require that the subscriber afirm that the FAQ had been > > > read in return mail before the subscription actually started. > > > > It helps that there is a bit at the bottom of the welcome message > > pointing out that anyone who does not prove that they have read that far > > and reply will not have their subscription completed. (If this is > > actually enforced) > > Hmmm. Perhaps there should be a quiz during the subscription process > whereby you are asked 10 questions that you will only know the answer to > if you've read the FAQ. It seems to me that I'd rather put up with a few "dumb" questions -- something I get all the time, in my computer business) than alienate, or scare away new users by quizzing on the FAQ. People were patient and gentle with me when I was starting out, and freely shared their knowledge with me without censure. Let's give the new people a break -- encourage the reading of the FAQ, certainly, but be patient with silly mistakes.

26 years, 8 months

PDP-11/44 is back in one general area!

by dseagrav＠bsdserver.tek-star.net

I moved the parts back to Tek-star. Now to start reassembling the beast... It's now in 2 places at once: My house and here. A week ago, it was in 5 places at once: My house, here, SSI, my car, and Jeff's house. I'll bring the BAs in and I can get to work!

26 years, 8 months

CLASSICCMP digest 241

by Zeus334＠aol.com

Could someone tell me what exactly "core memory" is? From mentions of ferrite, I am guessing it was some kind of magnetic thing, but what exactly? Acoustic delay line? What is that?

26 years, 8 months

Case designs (was: New Definiton REQUIRED)

by adam＠merlin.net.au

>Any other thoughts on case designs? I still think the Lisa was beautiful, >and I'll have to check out the 3b1. I have to agree about the Lisa - there is just something about her lines which really appeals to me. :) The Atari 400 is also a faviourite, as it has the weird science-fiction look. But the best (apart from the Lisa) would have to be the Mac 128 and Apple IIc - both are very much Steve Jobs' concept of what a computer should be, and although I don't agree with him they nevertheless have a fine design concept. If only I have a NextCube - that is one of the two computers I most want in the world (the other being a Sinclair ZX81). Adam.

26 years, 8 months

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test-drb November 1997