Frank, Thank you (repeat thank you) very much. The web page link you provided was excellent and answered my question. My G4 AGP uses the 3.5 mm stereo connector. I have the page bookmarked for future reference Dick > Message-Id: <p05200f00bc61a70ee29d@[24.218.10.143]> > Date: Tue, 24 Feb 2004 20:20:39 -0500 > From: fdutra1 at attbi.com > Subject: Re: [G4] G4-450 AGP Audio Connector Specs? > > 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? >>