[GreenKeys] ASR33 punch reader control line

Trammell Hudson hudson at osresearch.net
Wed May 8 21:23:08 EDT 2013


On May 5 2013 3:15 PM, Christian Gauger-Cosgrove wrote:
> Sounds like you have a DEC LT33 modified teletype, or similar. Put
> +12 on the extra plus 12 and -12 on the control line. [...]

That's similar to what I found in some documentation that I was reading 
as well.  However, Wayne suggested moving the brown wire from Molex #4 
pin 7 to pin 11 to bypass the control circuit.  I made this modification 
this evening and the tape reader now reads continuously in Line mode.  
Here's a photo after the re-wiring:

http://www.flickr.com/photos/osr/8719829105/in/photostream

Now we can read the collection of PDP-8 paper tapes that we found...

-- 
Trammell


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