I mentioned having a Univac 3 available for sale and have some interest.
When I watched a video linked to by a person on the IBM-MAIN mailing
list some time ago, there was a few Univac links, so I looked to see
what was there for Univac 3
this turned up which is supposed to be the US Army system
http://youtu.be/ICGPML5lzoY
There are tape drives in the short bit of video which are not
Uni-servo's and are probably not connected to the Univac near the end,
but you can see the system's drives in one bit of the video. NOte that
it had no disk storage it was all tape with the OS at the BOT of every
volume, or bits of the application.
Anyone recognize the logo on the tape drives (probably not Univac) at
the 23 sec point? it is a big red circle with two side bars. Rings a
bell to me but I haven't figured it out yet.
There was also a CHM show about timesharing with Univac that came up,
but I don't think the tape drives are the same Uniservo's that the U3
used, so is probably later. Also the theme is timesharing which of
course the U3 was definitely not ever going to do.
thanks
Jim
> On Mar 22, 2013, at 10:49 AM, Mouse <mouse at rodents-montreal.org> wrote:
>
> Often enough, especially with governments, the person put in
> charge of data preservation is not someone who has the foggiest
> idea of how to actually go about it.? They then have to rely on
> other people to do it, which is great if you know the right
> people and disastrous if you only THINK you know the right
> people.
these so called consultants have never
* used linux/unix or a 1980's or earlier computer system
* moved data between these system with sneakernet/null-modem[1] setup
> - Dave
[1] trying asking at your local computer shop about a Null-modem cable
tom sparks
Resend without attachments (too big; sorry 'bout that :-<). Anyone
interested in the missing attachments please contact me off-list.
On Sat, Mar 23, 2013 at 3:17 AM, Paul Birkel <pbirkel at gmail.com> wrote:
> No PDP-11-eating, please! The BC05C cable, and also the 7008360 cable,
> seems to be the key; these are shared across a number of DEC
> modules/variants.
>
> Finding documentation is quite a Where's-Waldo exercise, but a lot of it
> is "out there" it seems :->. In my case the attached two items were
> extracted from larger, varied, documents. Perhaps they'll be useful for
> the next challenged person :->.
>
> On Mon, Mar 18, 2013 at 5:08 PM, Tony Duell <ard at p850ug1.demon.co.uk>wrote:
>
>> >
>> > --f46d0444e88960605904d821f7a5
>> > Content-Type: text/plain; charset="ISO-8859-1"
>> >
>> > Can some kind soul point me to the technical documentation for the Q-Bus
>> > DLV11 M7940 Serial Line Unit? It has a 2x20 pin-out connector of
>> unknown.
>> > I gather that it's a pretty common card, so I'd expect the
>> documentation to
>> > still be "out there" ... like the truth :->.
>> >
>> > Not the DLV11-J, which is the 4-line card.
>> >
>> > The only good news is that the MC1488 and MC1489 are nearby, which will
>> > help a little. But documentation is *much* better! Probably any of its
>> > variants will do just fine (e.g., M7940-YA "M7940 W EXTRA WIRES TO BRING
>> > OUT CLOCK & 110/300 SPEED CHG").
>>
>> It should be much the same as the pinout for the DL11 (Unibus) seiral
>> interface or even the DL8 (Omnibus). It's a very ocommon DEC serial port
>> pinout. If there's no documetnaiuton on _any_ of thsoe out there, I will
>> eat a PDP11 or something.
>>
>> One trap for the unwary. These cards, or at least some of them, have
>> both RS232 and current loop interfaces on them. The outputs of the 2
>> possible receive buffers (1489 for the RS232, a nopo-isolator bnsed
>> circuit for current loop) appear on pins of this conenctor, as does the
>> inptu to the UART chip. You have pumper the appropriate pair of pins on
>> the connecotr of your cable. if you don't, you'll never receive anything.
>>
>> -tony
>>
>
>
Hi,
does anyone have XY8E plotter control schematics at hand?
I just plugged one into my currently active pdp8/e and it doesn't work :-(
And then I realized that I don't have schematics. At least not on my PC. And the
links on pdp8.net seem to be dead to me.
If anyone does have the schematics on his/her PC, please drop me a line.
But don't invest time to scan it. I'm quite sure that I have an original
*somewhere* in piles of paper...
Thank you
Philipp
--
Dipl.-Inf. (FH) Philipp Hachtmann
Buchdruck, Bleisatz, Spezialit?ten
Alemannstr. 21, D-30165 Hannover
Tel. 0511/3522222, Mobil 0171/2632239
Fax. 0511/3500439
hachti at hachti.de
www.tiegeldruck.de
UStdID DE 202668329
>The foam flaked off and seems to be deteriorating.
--- Hi Carl,
Just to add to Philipp's excellent advice: I replaced the foam in my RK05 with 1-inch high density foam from a JoAnn store:
http://www.joann.com/airtex-foam-chairpads-1-high-density/prd23481/?green=C…
Their warning not to cut with hot wire is not to be ignored! I found that cutting with an electric knife worked well. Used contact cement to glue it to the blower flange. Works great. There is about 3/4" clearance between card cage and blower, so it compresses appropriately.
By the way, removal of the blower is a pill. The fasteners are buried deep and require a hex key driver that is much longer than ordinary ones. Found an inexpensive set at Home Depot, which did the job. One fastener is particularly hard to get to. I decided to replace the hex fasteners with ordinary screws and emphatically did not install the fourth one. Three work fine. Note that the Velcro strap which is used to tighten the absolute filter is laid under the blower mounting, to secure it. I used adhesive to keep it in place when the blower is removed.
I notice that a lot of these drives seem to be missing the prefilter, as mine was. I used a common window screen kit to make the replacement filter. Used window screen on the outside but 100um nylon filter fabric from eBay, also tucked into the spline on the inside. Makes a decent facsimile of the original prefilter.
You can buy new-old-stock replacement absolute filters here:
http://www.varx.com/
I paid $60, plus shipping. A tip about getting the old filter out: I found it difficult to pull the filter off of the flange leading to the blower. Thinking that I must not be doing something right, I ended up pulling the blower off again to see what was happening. Finally decided that the old filter just had to be yanked off. Perhaps the plastic has stiffened with age. It finally came off. One thing that distracted me was the fact that, in spite of the flange blocking removal, the absolute filter fits the blower duct very loosely. Hence, a Velcro strap is provided to tighten the filter against the duct.
Some might think all this attention to filtering is overkill but after seeing the illustration on p. 1-17 of the 1976 RK05 maintenance manual of the 100um head flying height versus various contaminants, I have been very careful about dust. It's a relief that Philipp has had not-so-bad experiences with head crashes but I would like to minimize the risks.
Steve L.
http://www.tronola.com/
Don't know if any of you guys watch "The Americans" on FX. For those not in
the know, this show follows two KGB operatives living as Americans in the
US during the height of the Cold War in the early 80's. In the episode from
this week, there was a scene in an FBI building and in the background there
was a TRS-80 Model III sitting next to a bank of tape drives.
Well, it's been about a 3 year hiatus from the list for me...
How many of the old farts & curmudgeons are still around? ;)
One burning question, has the list's definition of a classic
computer been updated from the 10 year rule?
--
--- Dave Woyciesjes
--- ICQ# 905818
--- AIM - woyciesjes
--- CompTIA A+ Certified IT Tech - http://certification.comptia.org/
--- HDI Certified Support Center Analyst - http://www.ThinkHDI.com/
Registered Linux user number 464583
"...Talking to you is like clapping with one hand."
Anthrax, "Caught in a mosh"
I can't wait to find my 1000 year old or perhaps my great-great-great...at grandkids will finally be able to access my password protected zip file.
Maybe this is an investment call to collectors who get called upon to recover media?
