stampfki: I am jsut thinking about buying the Beoport in order to control the Mac Mini from the linkroom by Beo4.
Well I think you are on the right path.
If you buy a BeoPort and either use BMLink or Philippe's LinkPlayer
(see http://web.me.com/philrobin/LinkPlayer/Linkplayer.html)
you will be getting what you need.
The BeoPort / MacMini USB interface bypasses the need for the PUC ... the BeoPort picks up the command signals from the MasterLink, and then forwards them over the USB to the MacMini where either BMLink (only audio support) or LinkPlayer (audio and video support including via Plex) interpret the commands and respond by feeding video/audio signals.
An option could have been using the new generation of Apple TVs connected to the Beovision 1 ... if it had an HDMI connection of its own :-(
I am off to bed now, so the Q&A relay will now slow down unless someone like Philippe picks up the baton
First B&O (1976) was a Beogram 1500 ... latest (2011) change has been to couple the BL11 with the BL6Ks *sounds superb*