> From: "Jay West" <jwest at classiccmp.org>
> Subject: nut bars? ;)
<...>
> Is there a modern source of nut bars that one could order with specific
> thread size and # of holes (NEMA pattern)? Yeah, I know I'm being OCD and
How about something from here? http://www.ebay.com/bhp/rack-rails
I know they're not the floating-nut style you may have been thinking of, but
they might work...
~~
Mark Moulding
While I was fooling around with my ASCI I decided to test the serial
connection to my PC. The only thing I had available was my CT-1024 terminal
with the optional serial board. This unit never worked when I got it.
Thought it was its ancient and probably non functional PSU, but after
hooking it up to a bench PSU same issues:
1) Unstable video display with large whitish band in the middle.
2) No response to keypresses.
3) Field of blinking ? marks if cursor is switched off, garbled one
line of random characters up top if switched on.
When I connected it to my PC running PUTTY via serial cable, I fully
expected it to do nothing. But to my surprise, it generates a continuous
stream of Js (punctuated by the odd H) on the PUTTY screen if the RECV
switch is off. If I hit Break, it generates a whole bunch of Bs. If I
switch the RECV switch ON, the Js stop but I can still generate Bs with the
Break key.
One thing I'm wondering now that I've switched power supplies and the video
situation isn't cleared up.. I'm wondering if this thing was set up to
connect to a composite monitor at all? I've seen pictures of the CT1024
with a Sanyo monitor just like mine.. but on the Sanyo it does the same
thing it does on all the others.
Anyway, thoughts/ideas welcome. Would love to get this thing running again.
I am searching for a CPU card for a 9835 to replace the dead processor
in my 9835A, but a CPU card from a 9845B/C would also be ok. I would
prefer the 9835 card as it would be a drop in replacement but with a
9845 card I would have to transfer over the CPU module. The part number
on the module should be 5061 3001.
Paul. phb.hfx at gmail.com
Woot! I finally got my HP 7970E (yeah, a year in the making!), HP 88780, and
Overland Data OD3201 9-track tapes all working at the same time. One on
HP-IB, one on SCSI-1, and one on Parallel Port interface. Only my ever
finicky Qualstars got jealous and decided not to play ball. Here is a family
video:
https://youtu.be/eCBxNhEzIfc
The DOS computer is a vintage Dolch PAC 65.
Thanks for all here who helped with tips, documentation and software.
Marc
I bought a set of five DEC RX01 8" floppies (for the disks, since I have an
RX01 hooked up to my PDP-8/A) but I thought the contents might be of
interest to someone before I wipe them.
They are labeled VAX PSI V3.0 1/5 thru 5/5, (c) 1984. In order they are
AS-L154G-BE, AS-L155G-BE, AS-L156G-BE, AS-DC36B-BE, AS-DK35A-BE.
I did email Al Kossow about archiving but maybe he didn't receive the
message.
Anyhow, if anyone is interested, please contact me off-list. I don't have a
VAX so I can't read them.
Perhaps we can trade for blank SSSD disks?
thanks
Charles
Cctalk'ers,
Vintage Computer Federation -- the new 501(c)3 non-profit that now runs
the MARCH museum, and which will soon make some major expansion
announcements -- has a very cool new logo. Here's a preview:
http://www.snarc.net/vcf-logo-preview.png. Hoping everyone likes it!
- Evan
Amazing!
I had not seen this - a great chronicle!
It is important for all the folks to write up
what they did... if they do not there will be no record...
Ed# - _www.smecc.org_ (http://www.smecc.org)
In a message dated 10/14/2015 6:34:04 A.M. US Mountain Standard Time,
lproven at gmail.com writes:
The Burroughs B5900 and E-Mode
A bridge to 21st Century Computing
By Jack Allweiss Copyright 2010
My name is Jack A. Allweiss, also known as ?The Father of the B5900
System?. I did not give myself that title, my friends and co-workers
at Burroughs Corporation did, and I consider it a great honor. This
true story is about the B5900, and why it was an important milestone
for Burroughs and later Unisys, as well as the computer industry in
general.
?
http://jack.hoa.org/hoajaa/BurrMain.html
I've been watching a lot of vintage computer videos put up by enthusiasts
(thanks so much for that). I have been really fascinated lately by the
Altair and teletypes, paper tape readers and so on. Just watching one
fellow load BASIC into his Altair. you just felt the history and the
connection to Bill Gates and all the pioneers of an era that was happening
just as I was being born.
I only ever see teletypes for sale on ebay, only in the US, and of course I
don't bite because of shipping costs, plus usually people ask insane prices
for them. I am wondering what a reasonable price should be for a unit with
a paper tape reader, and any tips on how I might go about finding one beyond
Craigs, etc, up here in Canada. And anything I should watch out for and so
on.
Thanks muchly,
Brad
the red apple ref book had a 5 level running off game port or???
something as I remember....Ed#
In a message dated 10/15/2015 11:20:28 P.M. US Mountain Standard Tim,
unclefalter at yahoo.ca writes:
Thanks for this great explanation. So would anyone doing computing back
in
the early 70s have used a 5 level machine?
I saw this one on ebay (or is it two? Not sure what the deal is here)
It's probably sacked:
http://www.ebay.com/itm/Teletype-equipment-1-model-28-writer-1-reperforater-
1-50vdc-supply-etc-/121784463105?hash=item1c5aeb6f01:g:UR8AAOSwnDZUJHWs
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Brent
Hilpert
Sent: Thursday, October 15, 2015 10:07 PM
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Subject: Re: Fair price and ways to find a teletype
On 2015-Oct-15, at 6:25 PM, Brad wrote:
>
> Also separate question to others: I want to stay away from the Baudot
machines, right? (ie. Model 28, etc)
I'd say it largely depends on what your interests or purposes are.
A brief overview of the technology:
In the main, there were 3 generations of teletypes:
Era Common Model Code
Speed Common Interface Mechanism
====== ============ ==========
======= =============== ============
1) 1930s-40s: Model 15,19 5-level
~30-50 bps 60mA current loop Modified Typewriter Cage
2) 1950s-60s: Model 28 5-level
<=75 bps 60mA current loop Typebox
3) 1960s-70s: Model 33 7/8-level/ASCII 110
bps 20mA current loop Type Cylinder
These are the "page printers" that would type across and down sheet paper
fed from a roll.
There are other models, variations on the above.
Not included here are the tape printers, simpler mechanisms that printed in
one dimension on a narrow paper tape, ala stock tickers.
The mechanism was the overriding distinction between these generations as
speed and code capability followed from the mechanism:
1) Modified Typewriter Cage:
Decoding bars select 1-of-30-odd symbol/type arms
arrayed in an arc, to swing and hit the paper, just like a common
typewriter.
2) Typebox:
An ~ 1" by 2" metal box holds typeface symbol pins
in two 4*8 matrices.
The box is shifted up/down and left/right to bring a
selected
symbol pin between a hammer and the paper.
3) Type Cylinder:
A cylinder embossed with the typeface is moved
up/down and rotated CW/CCW to select a symbol.
The 5-level devices are commonly referred to as Baudot devices but this is
not strictly correct as they generally use the ITA2/USTTY codes
(International Telegraphy Alphabet No.2).
The speed of Model 28s (at least) was determined by a selected gear-set.
5-level machines need code conversion of course.
They all need current loop interfaces.
A lot of old computer equipment will do 110 bps as the 33s were so
associated with computers.
For working form modern equipment, the bit rates for all of them are
potentially awkward.
When working on the 28s, which were geared for 75 bps, I lucked out as I
found the USB-serial interface I was using could do 75 bps
- not entirely surprising as 75 is a factor of 2 down in the common
9600,1200,300 bps series. How many USB-serial interfaces are capable of
this
I have no idea.
Regardless, the baud rates are slow enough that bit-banging from a program
is not difficult, or an adjustable RC oscillator to a UART should do.
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