> Really? I thought it was 4.5V - 5.5V for logic 1...

http://www.twysted-pair.com/74xx.htm

Note that the output from one chip can actually only drive 10 inputs, I 
thought it was much higher than this but maybe I was remembering some other 
chip series.

> http://en.wikipedia.org/wiki/Hi-Z

Yes, exactly. Did you read the 2nd paragraph there? ;-)

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