[TrunkCom] historical EDACS question

[Jeff Kenyon]

Hi everyone, I was just wondering a few things, and they have to do with
EDACS.  When was the first EDACS system brought on line and where?  I also
was wondering what was the old GE-MARK trunked format like, and are there
still any GE-MARK systems out there?  I also was wondering about EDACS,
and is it going out with OpenSky replacing many systems in the future?