Check out http://www.nichevideo.com/G4_Differentiate.html for the info you need. I also have a more detailed scrap of info that I can't verify or remember the source of, email if interested Frank >I am placing an order for a SignaLink sound card interface unit (for a ham >radio PSK31 application) and they want to know what connectors are required >to mate to the Mac G4's audio in and out ports. They are used to dealing >with PC sound cards and I have never owned or seen a PC sound card. > >I have no idea what connectors are used on the G4 AGP and Apple never >defines anything in the manaul. My guess is they use the standard 3.5 mm >stereo connectors; however, Apple has been know to use non standard items. > >Can anyone confirm what connectors should be used? > --