15 Dec
2019
15 Dec
'19
5:35 p.m.
On 12/15/2019 01:19 AM, Dave Wade via cctalk wrote:
I wonder if there is any interest here...
-----Original Message-----
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net>
On Behalf Of John Lawson
Sent: 10 December 2019 17:41
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] DURA Selectric ASR terminals free
Greetings List!
I have a couple of "DURA" Selectric ASR terminals. I also have some limited
documentation on them. Neither of them work as far as I know. I tried to run the one in
the pic when I first got it, but it's jammed - so on the shelf it went.
They appear to be an 8-level code, dunno if ASCII, EBCDIC, or what.
The punched
tape is EIA, I think. There are diode matrices
to convert to the internal Selectric code of rotation and
tilt of the ball. I had one of these hooked to a CP/M
system back around 1980, I used it exclusively as a printer.
I could likely dig out some code that sent the data to
them. A quick look did not turn up the interface.
I seem to recall it had some pretty weird logic levels, PNP
Germanium transistors, etc.
It is possible to trip too many solenoids at one time and
command the rotate or tilt summing levers to exceed the
limits of the ball. That will break bands on the carriage.
I had no problem getting replacement parts when I had that
happen on mine. Not too sure Selectric parts are available
anymore.
Jon
These are joining the ever-expanding list of
"Projects Never to be Completed", so if anyone is interested, lemme know.
They are free, you pay shipping, they are about 50 pounds each and will require some
thoughtful packing.
Local pickup is happily offered, and I could possibly be bribed into delivering them
within a day's drive of Carson City (weather permitting).
Cheers
John KB6SCO
Carson City