CGB           MAX-232       9pin serial
                             port on computer
  +5V-----------+---+
                |   |
               16   =
                |   |+
                |   |
             |~~~~~~~~|
             |  16  2 |
             |        |
< Pin 4------|12    13|------3 <
> Sout-------|11    14|------2 >
             |        |
          +--|4      1|--+
         +|  |        |  |+
          =  |        |  =
          |  |        |  |
          +--|5      3|--+
             |        |
             |__15__6_|
                |   |
                |   =
                |   |+
  gnd-----------+---+--------5

 (4) caps @10uF Note polarity


I *believe*  this was done by Ken Kaarvik