That Weird 7-Pin S-Video Port on Old Laptops hackaday.com

VWestlife’s survey of early-2000s laptop video ports found that many seven-pin mini-DIN “S-video+” connectors added composite video and two S/PDIF audio pins to standard S-video, but pinouts varied by manufacturer. Apple’s PowerBook G4 used a different layout, omitting the audio pins and placing composite video on pin 5.