Message: 13
Date: Sun, 12 Jun 2011 19:14:49 -0700
From: Eric Smith <eric at brouhaha.com>
Subject: Re: Exploratorium looking 4 working ASR-33 or KSR
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Cc: ronh at exploratorium.edu
Message-ID: <4DF57299.4090403 at brouhaha.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 06/12/2011 19:14:39, Eric Smith wrote:
>On 06/12/2011 03:47 PM, Bruce Damer wrote:
>> Team if anyone on this list has a working ASR/KSR-33 they would like
>> to donate for an excellent exhibit at the Exploratorium, please
>> contact Ron below, see note...
>>
>> Your Name: Ron Hipschman
>> Your Email address: ronh at exploratorium.edu
>>
>> Do you guys have a functioning RS-232 teletytpe (ASR-33 or KSR-33)
>> kicking around that might want to be donated to the Exploratorium for
>> a possible exhibit?
>>
>> Ron Hipschman
>>
>I've seen a lot of model 33 Teletypes, and I've never yet seen one that
>is RS-232. They are almost all current loop. I don't recall seeing any
>mention of an RS-232 option in the manuals, although that may have
>existed as a third-party modification.
>IIRC, the model 40, 42, and 43 machines offered RS-232. The 40 is a CRT
>terminal with an optional printer, and the 43 and 43 are 5-level and
>ASCII (respectively) versions of a compact dot matrix printing terminal.
Oh ye of little faith. Tymshare made LOTS of RS232 capable ASR-33's.
They had a mod kit that they used along with the OEM call control unit.
It came in several models. The early one (circa 1968) had a small transformer (to make the proper voltages) and a control board with a relay to turn on the motor when CD (pin 8) became true. It preserved the Local/Off/Line switch function (the rotary switch on the call control unit). A later version used push buttons on the cover plate that goes over the CCU section of the ASR/KSR-33. They replaced the Line/Off/Local rotary switch on the "front panel" that was subject to knob breakage (usually a panicked service call). The front escutcheon that had the hole for the Line/Off/Local switch was replaced with a nice Tymshare enhanced logo snap on plate that looked nice.
My (at the moment lost or trashed) ASR-33 I did my own RS-232 conversion. It consisted of taking taps off of the transformer of the CCU (to get the other voltage) and including a nice solid state relay to do the "Carrier Detect" function for motor control. It required only a couple of transistors for the receive (RS232 to 20ma CL) and resistor tree for the other direction. Having a RS-232 capable ASR33 was a real nice thing to have when most of the connectors were DB-25's.
On another note: I do have a couple of old DECWRITERS. An LA-30 (modified for lower case) and a larger wide carriage one that I don't remember the model number (upper and lower case as well).
Ah yes, fun from the past....
Is it possible to change a 6P into a 6MP by adding a Postscript SIMM?
If so do the RAM and PS from a 5MP work in a 6P? Just wondering
about 6P I picked up as a spare, as my current Laser is a 5MP (and I
like the PostScript capabilities), I figure it's good to know these
things ahead of time.
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh at aracnet.com | OpenVMS Enthusiast |
| | Photographer |
+----------------------------------+----------------------------+
| My flickr Photostream |
| http://www.flickr.com/photos/33848088 at N03/ |
NSA releases 50K pages of documents.
See: http://cryptome.org/0004/nsa-50k-docs.pdf
Perusing the list, I see quite a number of IBM 7950 "Harvest"
documents that should make for some interesting reading.
--Chuck
The Rhode Island Computer Museum has a Wang 6230 CPU in a VS5700
10-slot chassis along with four SCSI controllers and terminal
controllers. That probably makes it close to a VS6230. The model for
GENEDIT is a 6128.
https://sites.google.com/site/ricmwarehouse/Home/equipment/wang-vs6230
The system was donated without the internal SCSI drive. We have plenty
of SCSI disks that we can install, but we don't have the VS boot
floppy or disk initialization utility for this system.
Does anyone know where the diskettes for this system could be located?
--
Michael Thompson
Here's something I found in alt.sys.pdp11. I have no connection to
Bruce Mitchell. Would someone please save this stuff from the scrap heap?
David Griffith
dgriffi at cs.csubak.edu
--begin quote--
Tue, 07 Jun 2011 23:28:15 alt.sys.pdp11 Thread 1 of 1
Lines 17 PDP11 hardware available for pickup 6 Responses
Dr. Klahn <xxdpplus at yahoo.com> at http://groups.google.com
Newsgroups: alt.sys.pdp11
Jim Bostwick's computer collection is going for rescue
or recycling. The following items are up for grabs:
11/44, 11/40, TU80, Pertec rack mount 9 channel tape,
Fuji J11 board for 11/24, considerable DEC documents,
RK07 drives and packs, RL01/RL02 drives and packs, Fuji
Double Eagle SMDs, CDC 9730/160 SMDs, numerous ST506
drives. I'm sorry, but I don't have a detailed list of
everything available.
Any of the above that anyone wants, they can have free.
Pick it up or arrange for pickup in Dayton, MN before June
20, 2011, the sooner the better.
Bruce Mitchell
Editor Emeritus, "The Multi-Tasker"
Contact me through: http://www.miim.com/consult.html#conts
I have used TECO on and off for 30 years (mostly
off for the past 15 years). The latest version that I
can find which was released for RT-11 is TECO
V36. This version was released with V04.00 of
RT-11 in 1980. The TECO command "EO="
confirms that the version is V36.
About a year ago, I found some source code for
TECO V36 which assembles to V36 when asked
via "EO=", but the TECO.SAV file is significantly
different from the version released with V04.00 of
RT-11 in 1980. The version based on the source
code that I found is 51 blocks long and it uses more
memory. The version from RT-11 V04.00 is just
50 blocks long and has a much smaller root section.
Probably most of the code is the same, just that
some of the code that is in the root of the version
for which I have the source has been moved to an
overlay.
Does anyone have or know where I might find the
actual source code for TECO V36 that was released
with V04.00 of RT-11 in 1980? If it is just almost
identical, that would be sufficient since it is usually
possible to easily make a few modifications to obtain
the identical TECO.SAV when the differences are
minor. Often, the differences seem major since they
can be the result of a single extra word (plus or minus)
which shifts the rest of the code and makes an exact
comparison impossible. But those changes are easy
to find and correct if the knowledge and experience
of what to do is available.
Since the TECO V36 released with V04.00 of RT-11
is now 31 years old and I have not heard of any bugs,
I have much more confidence in its reliability as opposed
to the version for which I have the source code.
Jerome Fine
During cleanup & preparation for reducing my collection, I came
across a small backplane with small flip-chips and marked 'DT-03'.
The backplane can be mounted horizontally in a rack.
The DT-07 is a single card with 3 berg connectors which apparently
go to the 2nd card which is named 'DT-07 connector/terminator'.
Anyone know what this is?
Ed
--
Dit is een HTML vrije email / This is an HTML free email.
