[GreenKeys] ASR 33 - question about powering reader

[Don Robert House]

Bill,

You do need a reader power supply.  It normally is clipped to the  
upper portion of the pedestal or stand. It has one Molex connector  
that mates to the M33 harness.
The model 32 uses the same type power supply.  Some 33s were modified  
to allow for remote reader start.  These had a label AUTO on the cover.

Try writing to Paul Cembura to see if he has any reader power supplies  
available for sale.  Paul is at: <mr_rtty at pacbell.net>

Good luck,
Don


On 16 Apr 2011, at 4:19 PM, billdeg at aol.com wrote:




Hi
I have been able to get my PDP 11/05 to print "hello world" by  
entering a short program into the toggle switches.  I can  
simultaneously get the punch to print if I enable it.


When I load and run the bootstrap loader the reader does not attempt  
to read a bootstrap tape either automatically or by pressing start.  I  
think that's because the reader is not getting power.

I have painstakingly traced the wires to get a good idea of the  
modifications made to the reader control. It appears that two of the  
wires coming from the reader are diverted to run through the 24V  
transformer (?) that is part of the reader control mod, and then exit  
the teletype.  On the other end the wires have round screw post  
connectors as if they could connect to a ground post or power  
supply.   Pics below.

Any ideas where these would be plugged in given the photos below?  I  
don't think the two wires are supposed to be plugged into pins 4 and 6  
of the mate-and-lock connector coming from the pdp 11.  I am pretty  
sure 4 and 6 are for a high-speed reader and have nothing to do with  
the TTY circuits.

http://vintagecomputer.net/teletype/asr33/PandB/with_PandB_JR-1000_pic2.jpg
http://vintagecomputer.net/teletype/asr33/PandB/PandB_JR-1000.jpg
http://vintagecomputer.net/teletype/asr33/PandB/with_PandB_JR-1000_red-black-leads.jpg
http://vintagecomputer.net/teletype/asr33/PandB/with_PandB_JR-1000_resistor_20mA.jpg

I am working to figure this out on my own, but I don't have much  
experience in this area!

http://vintagecomputer.net/teletype/asr33/PandB/PandB_terminalstrip4.jpg
FYI - The lines for the receive/send

I must be close.  I read that there was a power supply for the reader  
on some asr 33's, Do I need a 24V power source for the reader?

Thanks in advance for any ideas/tips.

Bill


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