[GreenKeys] ASR33 punch reader control line

Wed May 8 17:44:45 EDT 2013

Yes, that may well be for Model 33s modified by DEC, but for a simple current loop ASR33, the tape reader switch allows the distributer to be released. There is no need to “pulse” or otherwise modulate that control line to send tape data down the current loop.

Lester B Veenstra  MØYCM K1YCM W8YCM

lester at veenstras.com

US Postal Address:

5 Shrine Club Drive

HC84 Box 89C

Keyser WV 26726

GPS: 39.33675 N  78.9823527 W (Google)

GPS: 39.33682 N  78.9023741 W (GPSDO)

Telephones:

Home:                     +1-304-289-6057

US cell                    +1-304-790-9192 

UK cell                    +44-(0)7849-248-749 

Guam Cell:              +1-671-929-8141

Jamaica:                 +1-876-456-8898 

This e-mail and any documents attached hereto contain confidential or
privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited.

From: Teletypeparts [mailto:teletypeparts at aol.com] 
Sent: Monday, May 06, 2013 8:51 PM
To: lester at veenstras.com
Subject: Re: [GreenKeys] ASR33 punch reader control line

Lester,

Some 33's have a reader control card that is only operative when in Line mode.  An install by Digital Computers usually.

Wayne

-----Original Message-----
From: Lester Veenstra <lester at veenstras.com>
To: 'Trammell Hudson' <hudson at osresearch.net>; greenkeys <greenkeys at mailman.qth.net>
Sent: Mon, May 6, 2013 5:30 pm
Subject: Re: [GreenKeys] ASR33 punch reader control line

There should not be any need to "control" the tape reader other than using
the lever switch on the reader itself.

Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

US Postal Address:
5 Shrine Club Drive
HC84 Box 89C
Keyser WV 26726
GPS: 39.33675 N  78.9823527 W (Google)
GPS: 39.33682 N  78.9023741 W (GPSDO)

Telephones:
Home:                     +1-304-289-6057
US cell                    +1-304-790-9192 
UK cell                    +44-(0)7849-248-749 
Guam Cell:              +1-671-929-8141
Jamaica:                 +1-876-456-8898 

This e-mail and any documents attached hereto contain confidential or
privileged information. The information is intended to be for use only by
the individual or entity to whom they are addressed. If you are not the
intended recipient or the person responsible for delivering the e-mail to
the intended recipient, be aware that any disclosure, copying, distribution
or use of the contents of this e-mail or any documents attached hereto is
prohibited.

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net <mailto:greenkeys-bounces at mailman.qth.net?> ] On Behalf Of Trammell Hudson
Sent: Sunday, May 05, 2013 2:11 PM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] ASR33 punch reader control line

I'm attempting to connect an ASR33 with a current loop interface to a modern
computer and am not sure how to connect the punch reader control lines.  In
Local mode the punch reads fine and prints a copy of the tape as you can see
in this video: 
http://www.flickr.com/photos/osr/8662034542/in/set-72157633270866016

In Line mode, however, the tape reader does not do anything.  I believe the
control line need to be pulsed to clock in one byte, but have not been able
to find documentation on the interface specifications.  There are two
remaining wires in the cable and the label says they are "+12v reader" and
"Ctrl-line".  So I assume it is not yet another current loop, but sending
various voltages on the control line (shorted to ground, to my interface's
+5, to the +12v, etc) did not seem to have any affect.

Thanks!

--
Trammell
______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net <mailto:GreenKeys at mailman.qth.net?> 

2002-to-present greenkeys archive:
http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive:
http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net <http://www.qsl.net/> 
Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net <mailto:GreenKeys at mailman.qth.net?> 

2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net <http://www.qsl.net/> 
Please help support this email list: http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20130508/38203566/attachment.html>