seeking info on ASR-33 interface board

[Brian Knittel]

Hi Y'all,

I just popped open an ASR-33 I picked up a few weeks ago. The tty ran 
OK in local mode in the store where I found it but in shipment to me 
something happened, it now free runs (runs free?). Maybe it's a loose 
connector.  

In the electronics bay on the right hand side, there's a printed 
circuit board that runs from front to back. It's definitely a power 
supply, and probably also an RS-232 to current loop converter. In 
front is the line/off/local switch, and in back are several large 
Molex connectors. I was surprised to see this printed on the circuit 
board:

MITS INC
TELETYPE INTERFACE BOARD
REVISION 0
COPY RIGHT 1976

Does anybody know if this the Altair MITS? The date seems about 
right.

Was it common to produce custom internals like this for teletypes? 

Anybody have the schematics for this board?  

Thanks,
Brian

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_| _| _|  Brian Knittel
_| _| _|  Quarterbyte Systems, Inc.
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_| _| _|  Email: brian at quarterbyte.com
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