Sam Ismail typed out...
>I have an AT&T Horizon phone system (circa late 70s) which is significant
>in the history of telephone systems as it was the first "key" system. It
<reaminder snipped>
Sam, speaking as an ex-telco person, I can say with confidence that the
Horizon was far from being the first "key" system. That honor goes to the
original electromechanical 1A system, which was introduced in the late
50's/early 60's.
During the early-to-mid 60's, the 1A1 was introduced. It had several
improvements over the 1A, mainly in reduced size, weight, and complexity.
In the later 60's, the venerable 1A2 key system components were introduced.
They endured well into the early 90's, and are still in use in various
incarnations to this day (I have a 1A2 system here in the house).
The Horizon system fits neatly into the category of 'hybrid' systems. It
could, dependent on programming, become either an electronic key system or
a small PABX, incorporating the best features of both.
Thus endeth key system history 101. We now return to normal topical stuff.
;-)
BTW, if you ever want to look for a good home for that Horizon... ;-)
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Sysop, The Dragon's Cave BBS (Fidonet 1:343/272)
(Hamateur: WD6EOS) (E-mail: kyrrin(a)jps.net)
"Our science can only describe an object, event, or living thing in our own
human terms. It cannot, in any way, define any of them..."
Typically the CMOS battery voltage runs from 3.6V to 6.8, either
should do okay (in my experience). Try Fedco @ 1-800-542-9761 or
Battery Biz @ 1-800-848-6782.
Marty Mintzell
______________________________ Reply Separator
_________________________________
Subject: Re: CMOS Battery for PC/AT
Author: classiccmp(a)u.washington.edu at internet
Date: 3/23/98 1:11 PM
At 09:57 AM 3/23/98 -0800, you wrote:
>I picked up an original PC/AT that has a dead lithium battery for the
>CMOS bios parameter storage. The battery says it's 6.8 volts. It's the
>kind that is a 1/2x1x2 inch pack with a six-inch lead.
>
>I've tried several places to find a replacement, but either a store
>doesn't have it, or, if they have one, the voltage is not exactly 6.8
>volts.
>
>Thanks,
>Dave
>
This battery should still be fairly common. You should be able to pick one
up from Radio Shack. I don't think the voltage has to be exactly 6.8. The
package should list compatability, if not there should be a listing in the
store with a P/N xref.
--
David Wollmann
dwollmann(a)ibmhelp.com
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From: David Wollmann <dwollmann(a)ibmhelp.com>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: CMOS Battery for PC/AT
In-Reply-To: <3516A298.3E049E98(a)halcyon.com>
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On Mar 22, 16:18, Don Maslin wrote:
> Subject: Re: Kaypro: 81-149C vs. 81-232
> On Sun, 22 Mar 1998, Pete Turnbull wrote:
> > Usually there's a set of jumpers, or sometimes a small DIL switch pack,
> > which select one of four disk addresses. They may be labelled DS0, DS1,
> > DS2, DS3 or
> > perhaps D1, D2, D3, D4. D0=A and D1=B. You just need to switch the jumper
> > settings. Even if they're not labeled, you should find that all but one of
> > the jumpers (the drive select jumper) in one drive match the jumpers in the
> > other drive (of the ame pair).
>
> Unfortunately, Pete, very few of the full high floppy drive makers were
> considerate enough to mark them that way. That pretty much came about
> when they went to Berg jumpers for selection.
I dunno, I've got a few full-height CDC and Tandon drives that are marked.
But, yes, sadly a lot of drives aren't, which is why I suggested comparing
each drive of a pair -- hopefully they're the same model.
> > If you open up the drive case and tell us what the make and model number of
> > the actual drive mechanism is, someone can probably tell you the jumper
> > settings and whether the drive is 40/80 or SS/DS.
Well, maybe. :-)
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Found this on Classifieds 2000... In light of recent sales, might be a
good deal.
IMSAI S-100 crate, $300/OBO, Used
IMSAI S-100 crate with power supply and terminated
mother board.
For sale by private party
Los Osos, California - All other areas 93402
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.sinasohn.com/
On 1998-03-17 classiccmp(a)u.washington.edu said to lisard(a)zetnet.co.uk
:<the 8080 c.1977 which was a non-trivial self-contained interactive
:<interpreter, in 256 bytes including space for your own UART drivers.
:Simple yes, useful?
there have been a few tiny languages built over the years. there was
SIMPLE (and can someone describle it here please?); WADUZITDO, which
looked like a tiny PILOT and also fit into 256 bytes; FALSE, a 1k
compiler for a Forth-like language on the Amiga; BRAINFUCK, a 256-byte
compiler for a very simple language indeed, also on the Amiga; and
several versions of Forth and Basic which could fit inside 4k. of
course, the capabilities of the forth would probably rather outweigh
those of the basic... ;>
--
Communa (together) we remember... we'll see you falling
you know soft spoken changes nothing to sing within her...
I've compiled a list of known hardware and software for the Mattel / Radofin
Aquarius and Aquarius II computers. Please let me know if you know of
anything more, or if (*gasp*) I've made an error somewhere!
http://www.comcen.com.au/~adavie/weird/aquarius.html
Cheers
A
On Mar 23, 5:18, Doug Spence wrote:
> On Sun, 22 Mar 1998, Pete Turnbull wrote:
> > I don't know much about Kaypros, but is it possible that one of the sets of
> > drives is 40-track and the other is 80-track?
>
> I don't know enough about Kaypros myself to answer this one.
>
> > Or that one set is single-sided and the other is double-sided?
>
> Both machines have single-sided drives. And the boot disk I'm using is
> definitely single-sided, because I duplicated it using TeleDisk with side
> 0 only, and the copy boots up and runs WordStar just fine.
>
> > When you start up the machine and it tries to boot, does a light come on,
> > on the disk drive (which would indicate that the drive is being accessed)?
>
> Yes. The light for drive A comes on, and the motors for both drives come
> on.
>
> I get the same response out of the machine whether I use the Kaypro boot
> disk or an MS-DOS disk. But it is paying enough attention that it
> immediately tells me "I cannot read your diskette" when I insert a
> cleaning disk. :) [which makes cleaning a bit difficult]
>
> Also, just for the hell of it (and it's probably a Bad Thing(tm)) I nudged
> the head forward when the machine was off, to see if it would move when
> power was applied. And it did move back to its usual position.
Well, if the ones that don't boot do move the heads, and the light comes on,
sounds like the machine can "see" them and make them respond, but just can't
read the data. It's still possible they're faulty, but if they're all
single-sided, my guess is that one pair is 40-track and the other is 80-track.
However, if this were the case, I'd expect that the boot would go partway (the
drive would probably read track 0 OK, but not any other).
> > Usually there's a set of jumpers, or sometimes a small DIL switch pack,
> I'm afraid it's not that easy. I did pull out the flashlight and take
> some good close looks inside the drives tonight, though, and I think I
> know how it determines the drive number now.
>
> At the back of the main circuit board, just in front of where the ribbon
> cable connects to it, there is a 14-pin chip with a label "1F" beside it.
> In drive A, there is an empty 16-pin socket beside it, with "2F" written
> on the circuit board beside it. Drive B has something IN this socket - a
> BLUE 16-pin chip.
That is almost certainly a terminator resistor pack, and doesn't affect the
drive selection. Whichever drive is whichever number, that pack belongs in the
last drive on the chain.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Chances are your drive just needs the head cleaned and to be speed
calibrated. There are many documents on the web on how to speed calibrate
your drive, but if you need more assistance, I do these drives all the time.
Just let me know.
-----Original Message-----
From: CharlesII(a)nwonline.net <CharlesII(a)nwonline.net>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Sunday, March 22, 1998 3:14 PM
Subject: Drive crash
>My Atari 1050 disk drive crashed. When I try to boot a disk from it I
>get beep boot error beep beep boot error etc. I think I remember
>somthing about the beeps being a message when a boot error happens if so
>could somone tell me what it means and how to fix it since I don't see
>anything physicaly worng with the drive on the inside.
I finally opened up my Kaypros today to see if I could get the '2'
working. The II and the 2 seem to be almost identical inside, with two
notable differences: One of the ROMs has a different number on it, and
my Kaypro II has some wires soldered between pins on one of its chips.
The Kaypro II has a chip with a sticker marked "81-146A", with the "A"
stamped on in read ink. The Kaypro 2 has a chip with "81-232" on it, in
the same location.
What are the differences?
The chips at position U87 on both motherboards are marked DM74LS390N, but
the one in the Kaypro II has been messed with. It's a 16-pin chip, and
pin 1 has been bent upward and a wire soldered onto it, which leads to pin
6. Pin 9 is missing. Pins 12 and 15 are attached with a wire.
Is this normal for a Kaypro II, or has someone made a modification?
Anyway, I managed to make a copy of the WordStar disk that came in the
drive of the II today, using my Amiga 1000, A1060 SideCar, A1020 5.25"
floppy drive, and TeleDisk. So now I have a disk that boots reliably
instead of 1 out of every 5-10 times. That meant that I now know there's
something wrong with the Kaypro 2, because it won't boot at all with the
new disk. Before, it may have just been a borderline disk that was
causing the problem.
So (tell me if this was a bad/dangerous thing to do) I opened both
machines up and attached them to each others' disk drives. They were
plugged into a power bar, so I powered them up simultaneously with that.
The Kaypro 2 boot up with no problems, using the II's drives, and the II
was incapable of booting using the 2's drives, so I've got the problem
located to drive A of the Kaypro 2 now.
And BTW, both the II and the 2 have full-height drives.
Both keyboards have missing keys (including broken plungers). Will this
be easy to fix?
I'm thinking of fixing the 2, and using the II for parts, simply because I
like the colour of the 2's green phosphor monitor better (and some other
minor things). :) Is one model more rare than the other? IOW, does one
warrant saving more than the other? If not, I'll go with my feeling and
fix the 2 with parts from the II.
Doug Spence
ds_spenc(a)alcor.concordia.ca
