Looking at the MMJ jack:
         _____________
        | 1 2 3 4 5 6 |
         ---------.  .
                   ---

	Posit# Description              Corresponding RS232
	 1     Data terminal ready              20
	 2     Transmit (+)                      2
	 3     Transmit (-)             ---\___  7
	 4     Receive (-)              ---/
	 5     Receive (+)                       3
	 6     Data set ready                    6


...or the plug...

                                ____________ this is the clip-thing that 
holds
                                |               it in the socket...
                                v
                            _____
                -----------|     |--
                |          |_____| |
                |                  |
                | O  O  O  O  O  O |
                --------------------
                  1  2  3  4  5  6

As you can see, it's kind-of a differential setup, which actually isn't all
that dumb.  It's just that we seem to be the only ones using it :-). (not to
mention that important signals arn't there...)

Rob Urban