[GreenKeys] Interfacing to the HP 2752A (ASR33)...

[COURYHOUSE at aol.com]

too bad  you are not  close  I would  swap you   one of  our   plain 33s  
for  it!
 
it is  nice that it is  has the hp  part# and add on
 
Ed Sharpe Archivist for SMECC  see the  HP 2000  timeshare  system at  
_www.smecc.org_ (http://www.smecc.org) 
 
 
 
In a message dated 10/23/2012 6:38:51 A.M. Alaskan Daylight Time,  
clay at ArcherServices.com writes:

I have a Teletype ASR33 that has  the HP 2752A modifications.   Has anyone 
had any experience  connecting one of these?    With some research and 
tracing out  the modifications, it looks like HP added a circuit board (part 
number  02752-6001) which adds a “Read Command” to start the tape reader with a 
remote  signal.  I found a document showing the I/O pins for the 2752A 
which has  “Input Data Bit, +12V, -12V, Output Data Bit, Read Command, and Ground
”.  The current loop Input + (Terminal strip 3) and Current Loop  Output + 
(Terminal strip 7) are fed to the I/O connector as “Input Data Bit”  and 
Output Data Bit”, however the Current Loop Input – (TS 4) connects to the 
+12V input, and the  Current Loop Output – (TS6) connects to “Ground”.   I’m 
not sure  what if any other modifications have been made to the  ASR33. 
Can I just connect it as though  it’s a standard current loop interface, 
should I remove the HP modifications,  or should I adapt or create an 
interface that supplies the +/- 12V  supply?   Just trying to avoid some  smoke…;-) 
Clay  Archer 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/greenkeys/attachments/20121023/2e6b6f91/attachment.html