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Apple Macintosh serial port connector pinout

From: [email protected] (Joonas Timo Taavetti Kekoni)
Subject: Re: m{kki
Newsgroups: tky.trinet
Date: 26 Apr 1996 14:07:09 GMT
Organization: TKK/TKY

Joonas Timo Taavetti Kekoni ([email protected]) wrote:
napattu comp.sys.mac.hardwaresta:



                Macintosh (DTE)                           Modem (DCE)
                    DIN-8                                    DB-25

                Pin  Signal                               Signal  Pin

                 3    TxD-   ---------------------------   TxD     2

                 4    GND    ----+----------------------   GND     7
                 8    RxD+   ----'

                 5    RxD-   ---------------------------   RxD     3
                 6    TxD+   (nc)
               /------###------\         1 HSKo        Output Handshake
             /        ###        \                      (Zilog 8530 DTR pin)
           /                       \     2 HSKi/CLK    Input Handshake *OR*
          /     [|]   [|]   [|]     \                   External Clock
         /       8     7     6       \   3 TxD-        Transmit data (-)
        |                             |
        |                             |  4 Ground      Signal ground
        |     ===       ===    ===    |
        |      5         4      3     |  5 RxD-        Receive data (-)
        |                             |
        |                             |  6 TxD+        Transmit data (+)
         \----+    ===   ===    +----/
          \###|     2     1     |###/    7 N/C         (no connection)
           \##|                 |##/
             \|                 |/       8 RxD+        Receive data (+)

               \------###------/
                      ###