[GreenKeys] model 33 ASR reader/punch units

[COURYHOUSE at aol.com]

Doug if  you are using with  pdp8  do you  need the  auto control?
thx  ed
 
 
In a message dated 1/30/2016 8:53:10 P.M. US Mountain Standard Time,  
douglas-w-jones at uiowa.edu writes:

From:  Michael Zahorik [m.zahorik at sbcglobal.net] Sent: Saturday, January 
30, 2016  5:11 PM

> Started to look at the reader. I have a separate power  supply that 
mounts under the sub base. It has a number 183087 on the circuit  board. My print 
FS-8 shows that this power unit is for the reader feed magnet.  I have a 
question, The FS-8 print, says the 183087 is for the 'manual' reader  and a 
183079 is for an 'automatic' reader. What is the difference between the  auto 
and manual readers. Obviously I must have the manual reader.

The  reader supply can be mounted under the sub base, or it can be mounted 
in  otherwise vacant space in the call control unit.  I had to do some sheet 
 metal fabrication to reproduce the mounting hardware used to mount it in 
the  latter position, but the result was nice.  See:
--  http://www.cs.uiowa.edu/~jones/pdp8/UI-8/bugs.shtml#38

The 183079  supply can be used for either reader.  It has an on-board relay 
to turn  reader power off and on.  The 183087 supply does not have  this.

The difference between auto and manual readers is whether the  reader can 
be turned on and off by receipt of device control codes from the  remote 
machine (XON, XOFF, if I recall correctly).  Manual readers are  entirely 
manually controlled.

Visually, the difference is in the number  of positions in the 
reader-control lever.  Manual readers just have 3  positions.  Off, on and free.  Auto 
readers have 4-positions, Free,  off, auto and start.

Doug  Jones
jones at cs.uiowa.edu
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