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..."
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
>
>> 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
"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/
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
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