Leonard Erickson wrote in a message to Roy J. Tellason:

 LE> Ah. It does come apart without too much trouble.

 LE> Would an LM341 be the regulator?

Probably.  Sounds like a 3-terminal 5v regulator,  if I'm remembering
right.  (Added later)  I looked it up.  Would that part number have a -5
after it?  That'd be the regulated output voltage.  Or dash-whatever... 
Terminals will be in-ground-out,  with the metal tab away from you,  and
the in should go to that power input connector,  and will want to be
*positive*.

That was easy enough.

 LE> There's also a 8 position DIP switch inside (probably for setting 
 LE> serial parameters).

 RJT> That could be somewhat more difficult.  

 LE> Nah, just keep changing parameters until something prints. :-)  

Have fun...    :-)

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