Gniazdo SIO

Serial I/O (SIO) Port (all machines):

         2           12
          o o o o o o
         o o o o o o o
        1             13

(This is the SIO plug when looking at the back/side of the Atari)

1. Clock Input             8. Motor Control
2. Clock Output            9. Proceed
3. Data Input             10. +5V/Ready (not on 1200XL)
4. Ground                 11. Audio Input
5. Data Output            12. +12V (400,800 only. 1400XL/1450XLD?)
6. Ground                 13. Interrupt
7. Command