\./  
                             
5-pin DIN      1     3                       6-position SDL
on system unit    4  2  5            ABCDEF     on keyboard
                             
       
Pin In/Out Signal Name     to SDL Pin
                                     
1   I/O   +Keyboard Clock     D
2   I/O   +Keyboard Data      B
3    na    (reserved)         F
4  power    Ground            C
5  power  +5 Volts            E
not used           A

- -

Keyboard Connector - AT