[GreenKeys] 20ma current loop for my Dad's KSR 33

[Clay Archer]

Most serial I/O boards from that era support current loop.  There is no need to convert it to RS232.   I have my Imsai connected to my ASR 33 with an Imsai SIO board with current loop.    I can provide jumper settings and pinout if you need it.

Clay

 

 

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Andy KN4UCL
Sent: Tuesday, October 08, 2019 5:00 AM
To: Jeff Albrecht
Cc: Greenkeys
Subject: Re: [GreenKeys] 20ma current loop for my Dad's KSR 33

 

Jeff - good luck with your project! I don’t know if you are aware of David Mcnaughton’s IMSAI 8080 esp32 Kit - but that night be a neat step to add.  


On Oct 7, 2019, at 6:47 PM, Jeff Albrecht <jeffa at rodaw.com> wrote:

This was my Dad's. Wayne says it is a TWX machine. Dad had it hooked up to an IMSAI ~ forty years ago, although all the details of his connections that apparently were made in one of the two connectors that look like they would be hooked up to a phone system have been lost. I'm pretty sure it was via a IMSAI SIO. I personally played Star Trek on it. 

I'd like to connect Dad's KSR like I did with this ASR 33 I bought several years ago and hooked it up as shown on my wiki page; 
https://wiki.theretrowagon.com/wiki/20ma_current_loop_to_RS-232_conversion#Image_details Theoretically should that wiring configuration work on Dad's KSR? The numbered screw strip in the second image?

So I went to plug it into A/C to see how it did in Local mode. 2 of the 3 fuses (see last image) are labeled. The third that is missing it's fuse is not labeled. Any idea what fuse value I should place in there?

<iblofbbohjbalcec.png>

Inside the KSR show above.

<mbdgklbiklcakaab.png>

<kgdbcpbipclofnio.png>

______________________________________________________________
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

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
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to kn4ucl at gmail.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20191008/706e0f5a/attachment.html>