On Wed, 4 Sep 2002, Tony Duell wrote:
  However, the original question mentioned RS232. Which
is _not_ the same
 as serial. RS232 implies certain voltage levels.
 The CBM and Atari drives do not use an RS232 interface.  
AND,..
If I recall correctly, the Tandy Pdd1, although it was "almost
RS-232" used TTL, NOT RS-232 voltage levels.  There were some trivial
adapters available to permit it to work with "real" RS-232 signals.