Can we please end the endless, mindless discussion and get back to
'puters. I'm getting really tired of all of the anti-this and anti-that BS.
No wonder so many people have signed off this list.
James
--
http://webpages.charter.net/jrice54/classiccomp2.html
> HI:
>
> I am looking for a 5 1/4" floppy drive for a TRS-80.
> The cable would be great too! Please let me know
> the cost. Thank you.
>
> Sorry about my posting yesterday asking for a 1
> 1/4" drive. It was a typo.
That's fine, but you still haven't provided the
specific information about WHICH TRS-80 you needed a
drive and cable for...
That's like asking for a drive and cable for an Apple
Computer...
Please be more specific, and I'm sure there are lots
of people on this list who could be of help to you.
To repeast someone else's request:
- What kind of TRS-80 is it?
- Do you need an internal or external drive (i.e.: a
Model III or IV can use both)
- Do you need a case and power supply?
- Do you need a 35 or 40 track drive? Or do you need
an 80 Track Drive (mostly determined by the model, and
the type of disks you want to read).
If you can be more specific, those of us willing can
be of more help..
Thanks!
Al
Hi Bruce:
When you say that the telex machines used a "high-voltage DC, 60mA current
loop," is that implying a 120V loop as in standard TTYs? The reason I ask
is that the "private-wire" current loop for an M32/33 is a max of something
like 45 volts on the loop supply. I presume then, that the telex interface
box was designed for the HV, 60-mil telex loop, and then in turn drove the
internal 20-mil input to the selector-magnet-driver card of the M32. Was
this telex interface box in the M32 stand?
I had not heard of later M32s having Telex Line Adapters for FSK modem
application. How can you identify which interface an M32 has? Was there a
different dialer CCU, like the one with six pushbuttons used on the twx 33s?
I have some additional telex info from other folks added below.
ps: Bruce, did you see the post about all those TTY machines for free in
Seattle? Lots of good stuff headed for the dump.
gil
-------------------------------------------------
More telex info from George Hutchison:
Using a Teletype Corporation equipped telex machine on RTTY is relatively
easy.
You need a loop supply with a current limiting resistor (2K or so
wirewound pot) a double-pole double-throw switch, and the telex machine.
Connect the DPDT switch in the standard manner for reversing polarity.
Feed the loop supply (Such as one would find in a 28 LESU) through the pot
to the center terminals of the switch.
Wire the reversing terminals of the switch to the telex machine input
cable/terminals.
If you plug the telex machine into 110 VAC, with the loop supply
de-energized, it will run open. Some folks tweek the dial on the telex a
bit to get the machine to lock up, but this is not necessary.
Energize the loop supply. Depending upon the position of the DPDT Switch,
the machine will either stop running open, remain on and be ready to type
uponst, or will shutdown and the motor will stop. Flipping the switch will
result in the opposite condition to occur. With the machine energized and
the loop locked, set the loop current for 60 ma.
When the machine is on and ready to type, it will key the loop that is
coming from the loop supply. From there it is easy to use it to key
another machine, a transmitter, or what have you.
When the machine is in the off condition, motor shutdown, etc, depressing
the "LOCAL" button on the telex will cause it to come to life so you can
type locally.
I have an ST-6 that I removed the 110VAC that goes through the motor
control relay, and set it up with the reversing arrangement as described.
Most ST-6 motor control relays were DPDT. The loop current from the ST-6
goes through the motor control/now reversing relay, so when the ST-6 says
turn on the motor, the loop current flips polarity and turns on the telex
machine. Such a deal.
Thought some of you might like this bit of info.
73,
George, W7KSJ
-------------------------------------------------
More telex info from Don Robert House:
I have always just used the loop rather than tapping into the SMD
circuitry. I set a loop supply of 120-130 vdc to 62.5 milliamps with
two machines wired in series into the loop. The machines usually
have a mounting cord on them for this purpose.
The M32, if it is a former Telex, it uses the ITA2 version of Baudot
code. It is a 7.00 unit code with 1 start bit and 1 stop bit, which
is 50 baud and 67 words per minute.
-------------------------------------------------
More telex info from Jim Haynes:
There are two Telex interfaces to the M32. One is neutral, and the
other is a polar adapter that plugs into the neutral one.
Look in the Western Union Technical Review CD ROM; I think it's all
documented in there.
And yes, it's 50 baud, 7.5 unit code.
-------------------------------------------------
More telex info from Wayne LeTourneau:
Most Telex's are 66 WPM, I have 60WPM gears in mine and I connect the local
loop to terminals 8 & 9 in the rear. Local loop set at 60ma and not to
exceed 100 VDC.
It copies fine, I'M using a Flesher 170 tu. It also has automatic caridge
return and automatic line feed, so can copy those RTTY stations that are
using computers and don't have enough sense to send a LF and CR at the
right time.
I cannot get mine to talk to itself yet, have not figured out how to get
the keyboard in series with the printer.
Actually, the selector Magnets on thease draw close to 500ma, so you have
to use the driver card, which is where terminals 8 & 9 end up.
Wayne WB0CTE
-------------------------------------------------
>From: "Bruce Lane" <kyrrin(a)bluefeathertech.com>
>
> Now I'm glad I spent those years with Western Union's Field Service
division (when they still had one), fixing those things.
>
> The Model 32 Telex machine did not operate on a standard phone line. It
required a dedicated hookup to a specially-equipped Western Union central
office. The normal interface was high-voltage DC, 60mA current loop. In the
case of longer-than-typical cable pair length, a polar adapter was employed
to create a differential DC interface.
>
> The later Model 32's were equipped with TLA's (Telex Line Adapters) which
used FSK, as you've already guessed. I don't recall the frequencies
involved exactly, but 2200/2000Hz Mark/Space wants to stick in my head for
some reason.
>
> The Telex network, as far as I know, is long dead in the United States,
and some other of the more industrialized countries, replaced pretty much
by the Internet and FAXes. The Telex-ready Model 32's ran at around 67WPM
(Words per Minute)/50 baud. Amateur Radio RTTY standard calls for
60WPM/45.5 baud.
>
> In other words, you've got yourself a true museum piece there. You may be
able to, if you wanted, convert it for ham radio use. However, you would
need to change the motor gearing to bring the speed down a notch. Finding
the necessary gear would be an adventure at best, though I can suggest a
couple of possible sources if you want to try this.
>
> Enjoy!
>
>Bruce Lane, Owner & Head Hardware Heavy,
>Blue Feather Technologies -- http://www.bluefeathertech.com
>ARS KC7GR (Formerly WD6EOS) since 12-77 -- kyrrin(a)bluefeathertech.com
;-----------------------------------------------------------
; vaux electronics, inc. 480-354-5556
; http://www.vauxelectronics.com (fax: 480-354-5558)
;-----------------------------------------------------------
Wow !
Tony, could you send some photos of your disk drive ?
I'd like to see this "mystical" thing ! :)
The 24" platters of IBM's RAMAC are known to me but 36" platters ???
Who could have built such disk drives ? Any ideas of the company ?
Pierre
> > In about 1976 University of Missouri Bioengineering Program acquired an "IBM
> > surplus image system" from somebody "unknown" out west. They sent a couple
>
> [...]
>
> > There were two clamshell halves that were opened to access the platter, each
> > track had a fixed head over it. Stored on each track was the image on a
> > single display station. By switching between tracks you could access
> > different images. There was a vacuum pump to remove the air if you opened
> > the clamshells to adjust the heads. Each of the display stations had an
> > integrated keyboard and a proximity or optical pen to select menu items.
>
> One of the peripherals I have for my PDP11s is a PPL model 121 display
> system.
>
> It uses a magnentic disk to store the video images. I think it rotates
> once per field (the motor speed is electronically controlled with an eddy
> current brake IIRC). Images are stored using analogue FM modulation on 3
> tracks of the disk (one for each of R, G, B). There are several sets of
> fixed heads which can be selected so you can store several images on the
> disk and display them.
>
> The disk is a lot smaller than the ones described here, though. I've not
> taken the HDA apat (for obvious reasons), but it looks to be a normal 14"
> platter. The HDA fits, disk horizontal, into a normal 19" rack module.
> There's a separate PSU rack module, and a cardcage of electronics. It
> connects to the Unibus via a DR11B interface I think.
>
> -tony
______________________________________________________________________________
Keine Lust, immer Ihre Adressdaten in eine E-Mail zu schreiben? Mit der
vCard ist Schluss damit! Infos - http://freemail.web.de/features/?mc=021153
I just received a new board set for my VAX 11/750, which includes
an L0004 to replace the one I had before, which would send output
to the console, but wouldn't read input from the console. Now, however,
when I put in the new L0004, it prints garbage on the console. What's
more,
the _old_ L0004 doesn't print anything on the console anymore. Any
ideas?
TIA,
John W.
Hi, I have just bought a nice clean TELEX machine, it's a TTY-32, 5-level
coding,
with what looks like a phone line hookup, dial-type phone.
I wonder if anybody knows what the modem standard is for this, and/or any
phone number I could call to test this thingy out!
Thanks,
George
Patrick -
I dug out my Votrax manual (1982), and can give you the voltages:
Pins 1-3, 26 VAC, 180 ma
Pin 2, 20 VDC, 50 ma
Pin 4 is 0 volt reference
Unfortunately I don't have a PS for mine either.
Be careful if you find a PS from the Votrax Type 'N Talk. It also has the 5
pin DIN, but it puts out:
Pins 2-4, 19.8 VDC, .35A
Pins 1-3, 17.0 VAC, 1.0A
I do have a working TNT, and it is cool!
Also, the DIP switch configuration on the PSS: (1 is up, 0 is down)
1-3 baud rate: 000 - 9600
100 - 4800
010 - 2400
110 - 1200
001 - 600
101 - 300
011 - 150
111 - 75
4 up - xon/xoff for serial port
4 down - rts
5 - unused
6 up - power-up message spoken
6 down - power-up message not spoken
7 up - parallel port used as input port
7 down - serial port used as input port
8 up - self-test - continuously performs diagnostic test - no access to PSS
in this mode
8 down -normal operating condition
Bob Stek
Saver of Lost Sols
Hey,
Here's one for the Military members, and taxpayers, of the list ...
>from the "serial killer", "dick", "genital lice" that we are here in
Virginia ...
The Navy recently needed some Ariel Hydra Plus DSP boards and
contacted me about them. They mentioned also searching eBay.
Well, I ended up seeing some at ...
Ariel Hydra VME single board DSP computer
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=162&item=2302043683
I talked to the seller and he thought he had a thousand dollar reserve on them.
I told him, no, no reserve, just $500 opening bid.
He had made a mistake listing it and ended the auction because of his mistake.
I couldn't buy them. My buying budget couldn't cover $1000 boards that I wasn't
sure were even going to be the right part ( minor difference in last digit
of part
number) and I'm not an extraordinarily strong player.
But I gave the client the seller's phone number, and seems they may have
had possibilities.
Response from client ...
> Bennett:
> Will do. The boards on Ebay do not have the VSB option that we ideally
require, however these boards still may > be workable. We are researching
to find out what the slightly different part number denotes. We are still
> interested in any additional leads you may be able to find. Thanks for
your work on this!
I still want to follow up and see if this worked out.
Wish I could have made a little to cover my bills, but didn't seem doable
on this one.
But I might have saved you all a lot of money, and might have solved a
national need.
Can't post client contact info though. Having anyone pestering my clients
would be a no no.
But, might have built up the karma level. Right now I might see the light
at the end
of the tunnel on a project for the Saudi government. ( They are our allies ).
Also just donated a chassis to Cornell University ...
http://wwwapps.ups.com/etracking/tracking.cgi?TypeOfInquiryNumber=T&Inquiry…
With chassis, you can't get enough for them to make them worth packaging
and shipping.
So my terms were the mailing center had to do it. Plus I didn't have
suitable materials.
Used to wish we could bring some of you with us, but you made it seem
better to go it alone.
Incidently, with the situation overseas, the US military and many defense
contractors
are currently re-evaluating their spares levels.
Best Regards
