Apple 16-pin DIP Game Port socket (on the motherboard)
  for II, II+, IIe, IIgs


                           =========
Pushbutton 3 (GS only)  9 | *     * | 8  Ground
 Gm Ctrl 1 (Stick-1 Y) 10 | *     * | 7  Gm Ctrl 2 (Stick-2 X)
 Gm Ctrl 3 (Stick-2 Y) 11 | *     * | 6  Gm Ctrl 0 (Stick-1 X)
        Annunciator 3  12 | *     * | 5  /$C040 Strobe
        Annunciator 2  13 | *     * | 4  Pushbutton 2
        Annunciator 1  14 | *     * | 3  Pushbutton 1
        Annunciator 0  15 | *     * | 2  Pushbutton 0
        No Connection  16 | *     * | 1  +5V
                           ===| |===
                               ^
                        Notch on socket
       (faces toward front of computer except on the IIgs)