[GreenKeys] RS-232 Interface

[lobasa]

  Could anyone explain more about the RS-232 Interface? I have
seen the circuit that has circulated here on Greenkeys.  The 
Teletypewriters are standart 5 bit Baudot.  The RS-232 is 8
bit isn't it.  So is there an UART between the 8 Bit and 5 Bit
Baudot?  I have been looking for a UART circuit to use.
   Any information would be appreciated.
                            James Tanton
P.S.   I found a stack of 4n35 opto-insolators.  Couldn't they be
used  as a substitute in the interface?
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