PSXVCC  *----+                          +----+----*  PSXVCC
                   |       +-------v-------+  |    | +
               +---X-------|1            16|--+   ===
             + |   |    +  |               |       |
              ===  +--||---|2            15|-------+----*  PCGND and PSXGND
               |           |               |
               +-----------|3            14|------------*  (unused)
                     +     |    MAX-232    |
               +---||------|4            13|------------*  (unused)
               |           |               |
               +-----------|5            12|------------*  (unused)
                  +        |               |
       PSXGND *----||------|6            11|------------*  (unused)
                           |               |
        PCRTS *------------|7            10|------------*  IC1(6)
                           |               |
        PCCTS *------------|8             9|------------*  IC1(12/13)
                           +---------------+
                                 IC 3