> Date: Wed, 04 Mar 2009 00:41:07 -0800
> From: Brent Hilpert <hilpert at cs.ubc.ca>
> CSquared wrote:
>>
>> On Mon, 2 Mar 2009 11:41:14 -0800 Rich Alderson <RichA at vulcan.com> said:
>>
>> >> From: CSquared
>> >> Sent: Friday, February 27, 2009 2:53 PM
>>
>> >> I also seem to recall that Univac or some other computer manufacturer
>> >> actually used a 90 (?) column card for even better packing density.
>> >> I'll leave that improved calculation to someone who actually remembers
>> >> how many columns those cards were blessed with.
>>
>> > Univac 90-column cards are Hollerith cards just like the "IBM" cards.
>> > They consist of upper and lower groups of 45 columns of 6 round punches
>> > (instead of the rectangular punches favoured by IBM).
>>
>> Interesting. I don't know how I remembered the 90 columns as I never
>> worked with a Univac computer - only IBM's and various minis which mostly
>> didn't even have punched card readers at all. I'm not real sure I've
>> ever even seen one of the Univac punched cards. Your description
>> of the hole grouping sounds like maybe they encoded characters as
>> 6-bit codes vs. the "12-1 is an A", "12-2 is a B" scheme used by IBM.
>> I'm not real sure that's even correct either - it's been a right good while.
>
> It doesn't present the full encoding but there is a picture and some more info here:
> http://www.fourmilab.ch/documents/univac/cards.html
>
> The labelling on the card suggests the numeric digits were punched in biquinary
> format. I'm going to guess that that goes back to the origins of that card type
> when only numeric data where utilised, and that alpha & punctuation were added
> later, using the remaining 6-bit binary patterns.
I was just about to say I had never seen one of those, but then I seem to recall the Dallas-Ft. Worth turnpike also used Univac punched cards as tickets now that I think about it. That former turnpike has been a freeway (just another segment of I30) for quite a few years now. Perhaps that is the source of my hazy memories of those cards. If the coding is bi-quinary as the web site suggests, that brings back other unrelated memories of the adder in the IBM 1401. Of course I'm sure those show up in other machines as well, but that was my first encounter with them in about 1962 or so.
That looks to be a very interesting web site for many reasons, though those cards were not what I visualized. I have another vague memory of a card with oval holes (longer in the vertical dimension) with the 90 holes all in 1 row rather than in 2 rows as the web site shows. Now I'm going to have to do a bit of searching to see if I can find something that matches that memory.
Hi folks,
With all this talk about QBUS SCSI boards I thought I'd mention that
I have three Emulex UC17 UNIBUS SCSI boards available waiting for
the right deal. They came from a professional outfit and were
tested (and found working) two weeks ago. These are simply awesome.
Contact me off list for details, I won't bite.
Greetings, Erik
Hi,
I recently picked up in a lot of other stuff four DC600 tapes which is
an interesting mix.
I have no idea what systems they are for, maybe you do or have a need
for such?
Stardent 2.2 Diagnostics
1989-Part #125-0023-06
Kubota Pacific Computer 2.5 Diagnostics
1992-Part #125-0023-11
An unlabeled Tektronics tape, and another unlabeled 3M one.
Mike
I see someone is selling physical 9-track backups of rsts/e v7.2 RL02's
on ebay. that's cool.
Does anyone have tape images of RSTS/E 7.2?
I've seen 7.0 and 9+ but I'd like 7.2 for uda50 support.
I've seen one on the web but it says the tape had read errors.
-brad
Hi,
Before I do it - I thought I should ask :) Can I use a
M9302 as a UNIBUS terminator in a PDP 11/35 or 11/40.
The manual mentions a M930 which I don't have, but I do
have the M9302 which looks a bit more involved (has
some ICs.
The M9302 was from a 11/34 which is a later generation.
Having said that, the 11/35 does work without the
terminator - although I cant see a terminator on
the system.
Thanks
Ian.
Hi,
Any comments on use of peroxide to freshen cases?
http://retr0bright.wikispaces.com/
I thought many cases were RIM and were something other than ABS as
mentioned in link.
Steve
Some S100 chassis had multiple primary taps, CVT or a in the case of
Inetgrand {and a few others} boxes regulators.
The problem is the early machines had to have really robust transformers
as the +8V bus could easily be 25A using early boards. By 1980s with
64k ram cards (64k on one card) and multi serial IOs on one board a
typical system might take from 3-5 board at far lower current than the
earlier 4k ot 8k based memory systems. The side effect fo that was the
bus voltages being upregulated would float higher and regulators would
run really hot. Near the latter days typcail systems were system on a
card (z80, 64k or even 128k, 2 serial, FDC and printer port) making the
whole load typically under 3-4A at +8V and the need for more boards
unlikely.
Allison
>
>Subject: Re: S-100 power supply voltage ranges
> From: "Barry Watzman" <Watzman at neo.rr.com>
> Date: Mon, 02 Mar 2009 10:42:55 -0500
> To: <cctech at classiccmp.org>
>
>Actually, the factory fix was a "bucking transformer", a whole second power
>transformer installed out of phase in series with the primary power
>transformer so that the voltages were subtractive. There is a factory ECN
>on this topic. But the bridge regulator solution was common among the user
>base (I myself have used it) as a lot simpler and cheaper, and almost as
>effective.
>
>
>------------------------------
>
>Message: 3
>Date: Sat, 28 Feb 2009 11:07:56 -0600
>From: Jim Battle <frustum at pacbell.net>
>Subject: Re: S-100 power supply voltage ranges
>To: General Discussion: On-Topic and Off-Topic Posts
> <cctalk at classiccmp.org>
>Message-ID: <49A96F6C.6060602 at pacbell.net>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>Chuck Guzis wrote:
>> All of the S100 boards I've seen use simple linear regulators, so you
>>
>> need some headroom--but not too much. A lot of S100 7805s and LM323-
>> 5s were operated within an inch of their maximum current ratings (some
>> had bypass resistors installed) and generated a lot of heat. I
>>
>> wouldn't run the supply rails any higher than I had to.
>>
>> Cheers,
>> Chuck
>>
>>
>
>The Sol-20 had an app note about this problem. Apparently they shipped them
>for a while with transformers that were out of spec with the end result that
>the unregulated power ran high. The recommended fix was to take a power
>bridge, mount it to the case, and wire it in series with the positive
>voltage run in order to get a ~1.4V drop.
>
>
-----------Original Message:
Date: Fri, 27 Feb 2009 01:04:49 -0500
From: Ethan Dicks <ethan.dicks at gmail.com>
Subject: Re: Recommendations for AIM-65 power supply?
On Fri, Feb 27, 2009 at 12:49 AM, Josh Dersch <derschjo at mail.msu.edu> wrote:
> Title basically says it all -- anyone have any recommendations for a decent
> power supply for an AIM-65? ?I have it running right now on just 5V, but I
> need something that puts out 24V so I can run the little printer, too :).
> ?It'd be nice nice to something small enough to fit inside the enclosure
> this thing came in but I'm not that picky. ?My searches on the 'net reveal a
> lot of choices, so I'm looking for advice on what to look out for.
>
> For those playing along at home, the AIM-65 wants 5V at ~2A, and 24V at
> ~2.5A.
I don't know where to get one now, but my AIM came packaged with a
steel bottom, a plastic top, and a PSU that has "AIM65" in the part
number and that provides +24V. It looks like many other 1970s
open-frame switchers with a large 1/8" or 3/16" aluminum baseplate and
one or two power transistors, but unlike the others, it has more than
just +5, and +/-12V.
So at one point, someone was making 3"x4"x2" PSUs just for the AIM-65.
Unless you happened to run across some that someone has as a stash of
spares, I don't know where you'd find that exact model now, but it
does exist.
-ethan
---------------Reply:
Well, I do have a 'stash' of about 6 or so but unfortunately (for you) I also
have a stash of AIM-65s. As a matter of fact I'm looking at several right
now to see just how many are worth saving; I might end up with one or
two without working printers, in which case I might have a spare supply.
I'll keep you in mind, but meanwhile it shouldn't be a big problem finding
24V somewhere; the required current is nowhere near what the 8" drives
used. As Dwight suggests, it oughta be fairly simple to adapt the +/-12V
on a PC PS.
FWIW, there were at least two suppliers: initially Condor Inc. supplied one
(part no. AA524-AIM65), and later Rockwell also supplied a fancier one
made by Lestronics (Part no. A65-004-03). The Condor 24V supply looks
like just a half-wave diode, cap and Zener.
mike
Hi! What are acceptable voltage supply ranges for an S-100 power supply? I
am assuming 115VAC input. My intended application is a small home brew
S-100 backplane.
I have seen the S-100 voltage rails vary but I believe +15VDC, -15VDC, and
+9VDC would be sufficient. Herb's S-100 page lists the voltages as +18VDC,
-16VDC, and +8VDC but I have seen other voltages used.
Thanks and have a nice day!
Andrew Lynch
