9-pin mini-DIN connectors are used in graphics systems that feature the ability to input/output a video signal or just input (AV in). There is no standardization between manufacturers as to which pin does what, and there are two known variants of the connector in use. Although the S-Video signals are available on the corresponding pins, neither variant of the connector will accept an unmodified 4-pin S-Video plug

Electrical interface notes:

RGB, YUV, Hsync/Vsync