test-drb November 1999

test-drb@ccmp.vtda.org

211 participants
749 discussions

50-year-old Aussie CSIRAC computer being restored

by jfoust＠foust.org

Having just returned to the list, I'm not sure if this news made it here yet, but here's a few links to stories: <http://www.theage.com.au/news/19991122/A56120-1999Nov21.html> <http://www.it.fairfax.com.au/hardware/19991123/A57309-1999Nov22.html> <http://technology.news.com.au/news/4280542.htm> - John

24 years, 10 months

Own Your Own Internet Store

by sports111opp＠hotmail.com

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24 years, 10 months

Own Your Own Internet Store

by yen111opp＠hotmail.com

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24 years, 10 months

Tektronix u8002 uProcessor Lab (MicroProcessor Developement System)

by rigdonj＠intellistar.net

Does anyone have one of these? I picked up the manuals for one and it looks like an interesting device. Joe

24 years, 10 months

FW: Used PDP Equipment.

by kyrrin＠bluefeathertech.com

I have no clue what this guy is selling. The fact that he's posting >from an AOL account bothers me a bit. Still, he may have something of interest. Contact him directly if you're curious. -=-=- <snip> -=-=- On 23 Nov 1999 05:19:02 GMT, in comp.os.rsts you wrote: >>From: reddogno1(a)aol.com (Reddog no1) >>Newsgroups: comp.os.rsts >>Subject: Used PDP Equipment. >>Lines: 3 >>NNTP-Posting-Host: ladder06.news.aol.com >>X-Admin: news(a)aol.com >>Date: 23 Nov 1999 05:19:02 GMT >>Organization: AOL http://www.aol.com >>Message-ID: <19991123001902.10768.00001374(a)ng-fm1.aol.com> >>Path: news1.jps.net!news-west.eli.net!sdd.hp.com!enews.sgi.com!newsfeed.mathworks.com!portc04.blue.aol.com!audrey05.news.aol.com!not-for-mail >>Xref: news1.jps.net comp.os.rsts:19 >> >>Does anyone know who would like to purchase used PDP Equipment? >>Please reply to Reddogno1(a)aol.com >>Thank You. -=-=-=-=-=-=-=-=- Bruce Lane, Owner and head honcho, Blue Feather Technologies -- kyrrin (at) bluefeathertech [dot] com Web: http://www.bluefeathertech.com "...No matter how we may wish otherwise, our science can only describe an object, event, or living thing in our own human terms. It cannot possibly define any of them..."

24 years, 10 months

HP's not cool? (was Re: pdp-11/60 Semi-Rescue)

by edick＠idcomm.com

I have to agree, though they never could build a 'scope that would trigger they way you'd have liked . . . Their downfall, by the way, seems to have coincided with their move into computers. For a time this seemed OK. Their notion of "user-friendliness" was looking like a pretty good one in their logic analyzers too, but I don't remember an HP computer product, particularly once they absorbed APOLLO, for which any installation/upgrade, no matter how minor didn't involve 3 layers of system downtime, on the order of 3 days per workstation, i.e. if you had one server and three stations, you had 3 instances of 9 days of downtime, say, to get the updated simulator libraries realigned, though they were supposed to work "out of the box" but didn't. We had more servers and more stations, so there were more instances of longer downtime. Though I did object to the choice of HP, I was still mightily embarassed by the fact that after having HP CAD/CAE systems for a year, they still couldn't be relied upon to do what any PC could do. Dick -----Original Message----- From: Tony Duell <ard(a)p850ug1.demon.co.uk> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Sunday, November 21, 1999 10:00 AM Subject: Re: HP's not cool? (was Re: pdp-11/60 Semi-Rescue) >> >> I think anyone who has been hooked by HP gear would say the same thing. >> Even before anything with the HP logo on it could grab my undivided >> attention, I was always amazed at the kind of ingenuity and engineering >> brilliance that went into the physical design of the systems. > >Yep... HP stuff _used_ to be very well engineered, both electronically >and mechanically. The 9100 is a total work of art, for example :-). I >love working on such machines. > >Just a pity that modern HP stuff is nowhere near as good, and that their >support at the moment is a total joke. > >-tony >

24 years, 10 months

Yet more on -8/m Mem problems

by healyzh＠aracnet.com

>> I had the following results when depositing 7777 to the memory. >> >> Memory locations: xxx0 - xxx3 don't save anything >> Memory locations: xxx4 - xxx7 save 7760 > >OK, on the G227 card there's a pair of 8251 decoders at locations E46 and >E39 that decode the lowest 3 address lines, along with the Read H signal. >E46 handles locations xxx0-xxx3 and E39 handles xxx4-xxx7 (at least if Unfortunatly I won't be able to look into this until I get off work tonite, or tomorrow before work. If nothing else I'll try and hit the books tonite and get some of the preliminary research on this done. BTW, does anyone know of a way to read the TIFF's on Highgate on a UNIX box, for when I don't have the paper copies of the Maintenance manual handy, but have a chance to do a little reading? It would be nice if XV can handle them, but it only seems to be able to display the first page. >> Also step 6 tells me to check the resistance of diodes FSA2501. Um, >> someone mind explaining how to do this exactly? Beware, I don't have the >Then for each diode pack, check for diode action [1] between pin 1 >(common cathode) on the chip and pins 3,12,2,5,8,7,11,9 separately (8 >tests). Then do the same between pin 14 (common anode) and >3,12,2,5,8,7,11,9 (8 more tests). Terrific! This is exactly the info I was looking for! I'll have to double check tonite, and redo my readings, but I think the core board is OK. >HOWEVER. Diodes are non-linear components. It's not meaningful to talk >about the forward resistance unless you specify the current that was used >to measure it. Different meters (and even the same meter on different >ranges) can give very different results. My guess is that the figures >given in 4.7.1 in the manual relate to a particular type of meter (the >Triplett Model 310 mentioned in Table 4.1?), and you might get very >different results on a working board. This and the pinout above look to explain my problems with checking the FSA2501's. I'm showing about .8 MegaOhm's one direction, and infinite the other direction. I'm using a Fluke 77III Digital Multimeter to take the readings. That's so far off from the ranges given in the manual, that I was fairly sure I was doing something wrong. After all I think the manual says something like 25 Ohms, while I'm getting .8 MegaOhm's. I still find that a little hard to believe. This morning I went so far as to try and check out ALL the X-Y lines and Sense-Inhibit lines running through the core. I'm fairly sure the core plane itself is intact. Thanks for all the great info Tony! I'm starting to think I might just be able to get this fixed. Zane

24 years, 10 months

HP stuff (was HP's not cool)

by aek＠spies.com

"Can you point me to some more info on the HP's. I learned basic on HP2000c's but I'd like to understand the hardware design on 'em. " Jeff Moffatt's site is a good place to start http://oscar.taurus.com/~jeff/2100/

24 years, 10 months

Looking to benchmark my 8/S.

by dylanb＠sympatico.ca

If anyone out there is running FOCAL,1969 (standalone) and can send me the amount of time it takes their PDP-8 to come back with the result of these functions(not including the teletype time) I would appreciate it. I have the 8/S clocked at: TYPE 1067^56 5 seconds TYPE FSQT(1067^56) 4 seconds TYPE FSQT(123^789) 25 seconds. This is a quick test and I will try some other functions..... I am going to try this on the 8I.. I would appreciate the results from a straight-8, and an 8/E. BTW: This is a great "light bulb" test. john

24 years, 10 months

Have dinosaur - need paper.

by rigdonj＠intellistar.net

I knew that would get your attention! I picked up an old HP 7245B printer/ plotter that uses thermal roll paper with tractor feed holes on the edges and a notch at the top of each page. Does anyone know where I can get paper like that? I don't know the HP part nuber for it but I do remember that they also sold the same kind of paper except it was fan fold instead of rolled. I can use the fan fold stuff in a pinch. Thanks, Joe

24 years, 10 months

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test-drb November 1999