David Williams said: >I'm evaluating Mac the Scope, which works nicely in the audio frequency >range. I would like to be able to expand into the Mhz range. The "Dark >Side" has a USB device/software package for this. What is available for >the Mac? Check out: Chart & Scope http://www.adinstruments.com/products/ SignalScope http://www.benjaminfaber.com/ InstruNet Hardware and SuperScope II http://www.gwinst.com/html/frameset.html WaveWindow http://members.aol.com/raymeow/index.html#ww.targ Randy B. Singer Co-Author of: The Macintosh Bible (4th, 5th and 6th editions) How To Deal With Common OS X 10.3 Panther Problems http://www.macattorney.com/panther.html