I've taken my newly-acquired PDP-8/E apart to clean out the dust and
disintegrated foam, but I've not powered it up yet. (In fact it's still
in pieces while I sort out the foam). I'll be checking the capacitors
before I go much further.
Part of the reason for not powering it up is that it's a 110V version,
and here in the UK my mains is 240V. Looking at the engineering
drawings (on David Gesswein's site, and Highgate) for the H724 (110V)
and H724A (240V) supplies, I see transformer taps shown for both
voltages, and on the face of it, it should be very easy to convert.
Just a matter of moving the connections from tags 6 and 9 of the relay
(or "realy" as the schematic calls it :-)) Has anyone ever done this?
Another question: There are four 1N4721 rectifier diodes used for the
+8V and +15V supplies (two pairs for two full-wave rectified supplies).
Someone before me has disconnected one end of one of them. Usually
that's because it's gone short, but my meter says this one is OK. Any
ideas why?
I'm also lacking any serial interface for this machine. I do have some
other spare boards; is anyone (especially in the UK) interested in a trade?
--
Pete Peter Turnbull
Network Manager
University of York
From: Richard <legalize at xmission.com>
> Subject: Re: keypunch equip on govliquidation
> To: "General Discussion: On-Topic and Off-Topic Posts"
>
> In article <112020081326.28067.49256593000ACD3500006DA322218865869B0A02D29B9B0EBF9D0A050E039A089C at att.net
> >,
> shumaker at att.net writes:
>
>> large govliquidation lot auction opened today has two types of
>> keypunch consoles
> , one of which seems to be unused IBM equip. Photo shows it even
> has some docum
> entation.
>>
>> http://cgi.govliquidation.com/auction/view?
>> id=2037010&categoryId=c7149
>>
>
> That looks like the kind of keypunch we had at the University of
> Delaware
> around 1979/1980. I remember using them to duplicate punched cards
> just
> for the purpose of making confetti :).
The earlier pictures are .029 keypunches which look to be in great
conditions. The next to last picture looks like a .026 keypunch but
seems to have suffered a bit, but still good for spares. If only they
weren't the wrong side of the Atlantic or cost a bit less to ship. Are
they really saying the keypunches only cost them 100 dollars each new
(400 for 4 and 200 for 2)?
> >> I'm guessing Proteon was an independent company until
> DEC bought >> them at some point?
> >
> >Did DEC ever buy Proteon? I was with DEC's network group
> (NAC) >when we bought the rights to the Proteon code base
> (or at least >some of it).
>
> That's how I remember it too. I was involved in that
> handoff at the time.
>
> I may have left before it came to fruition, but I don't
> remember that anything ever came of this. In other words,
> DEC paid Proteon $1M or so, got a pile of source code, and
> nothing was done with it.
At some point Proteon became part of Ascend.
I'm looking for a set of manuals for the Proteon P4100/P4100+/P4200
routers, circa 1989 or earlier. I'm guessing Proteon was an independent
company until DEC bought them at some point? Just guessing. Anyway, if
you've got a set of manuals I'd be interested in purchasing them from you.
Please contact me directly if you have some.
Thanks!
--
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 ]
Mr. Joe R.,
I am a manager for a calibration company and ran across your web
page stating that you have several old Nicolet manuals. When I clicked on
your link for them it told me that this was an invalid link. I am curious
if you have a manual for a Nicolet Integra 20 Oscilloscope. I am looking
for calibration information and having a hard time finding it online due to
the age of this equipment. Can you help me out?
My Regards,
Chris Henley
Lab Manager
Precision Metrology, Inc.
Phone: (414) 351-7420
Fax: (414) 351-7429
chrish at precisionmetrology.com
What was the first machine to have some sort of graphical display (most
likely oscilloscope style) driven by a computer?
SAGE is the first one I can think of; I don't recall the predecessors at
MIT having any sort of graphical display.
Then, after the first machine, besides SAGE, what systems were utilizing
graphic displays in the 1950s? Did the IBM commercial derivative of SAGE
use any graphic displays?
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>
hello,
Im trying to find one of those all-in-one PS/2 computers that IBM had
in the late 80s, some were under the "EDUQUEST" badging, but most were
the all-in-one 8525, and for some reason those who are selling on ebay
think they have one of the rarest machines in the world and charge as
so, and it really makes me regret not grabbing one from the salvage
pile when they dumped all the ones in 99 when i was in middle school.
anyway, does anyone have one they are willing to part with, or know of
a cheap source of them? thanks
-Joe
I came across something strange that I need some help with. Pictures
are here:
http://www.brutman.com/2008_1117_140718_RS232_conv_back.jpghttp://www.brutman.com/2008_1117_140718_RS232_conv_top.jpg
It looks like a converter box that takes TTL level serial signals and
converts to RS232 levels, kind of like the MAXIM single chip solution
except that it is using 1488 and 1489 chips.
The problem is that it came with a PCjr, but it doesn't physically plug
into a PCjr. The onboard serial port is only 16 pins, while the
rectangular connector here is 20 pins. It physically doesn't work.
Does anybody know another machine or card that might have used the 20
pin header for a serial port? I'm almost thinking that I'm missing
another piece (a card internal to the machine) that the header goes to.
Regards,
Mike
> I'm looking for a set of manuals for the Proteon
> P4100/P4100+/P4200 routers, circa 1989 or earlier. I'm
> guessing Proteon was an independent company until DEC
> bought them at some point? Just guessing. Anyway, if
> you've got a set of manuals I'd be interested in
> purchasing them from you.
>
> Please contact me directly if you have some.
Wow, there's a flashback. I was working for Proteon when
these were developed. I helped prototype some of the boards.
I used to work extensively with these post-Proteon and now
remember almost nothing about them.
On 18 Nov 2008, Curtis H. Wilbar Jr. said:
> While cleaning, I dug up some ULTRIX CDs I didn't know I had.
>
> Curious as to find out exactly what I have and if it is complete...
>
> [...]
>
> Does this mean I have Ultrix 4.2 for VAX and RISC,
> Ultrix 3.1 for FAX and RISC, Ultrix 3.1 Update ?
> What is Ultrix WS 2.0 (windowing system?) ?
>
> Trying to figure out what I have here and how complete/
> incomplete it is.
I'm no expert, but I've done a little ULTRIX sleuthing myself over
the last couple of years, learning more about ULTRIX and how to
use it on my c. 1990 DECSystem 5400, which is RISC-based.
From my experience, primarily with with ULTRIX 4.5, 4.3, and
4.2, I'd say that the 4.2 discs, one each for VAX and RISC,
would be considered a 'complete set' for each architecture.
The online documentation disc is probably a companion for
either or both of these 4.2 install discs.
I'm not acquainted with the earlier releases (though I'd like to
be), but it would appear that the ULTRIX-32 V3.1 with UWS V2.2
should be considered complete (for both VAX and RISC) since you
have both the ULTRIX OS + UWS on the one disc, which also looks
to supersede the ULTRIX-32 V3.1-UWS V2.1 UPDATE disc.
As for the V2.0, I have no idea if you have a complete ULTRIX +
UWS package, or if it is just the UWS.
- Jared
