> I'll look into the 8584 when I get more serious about this project.  An
> I2C sniffer is definitely one of the tools I need to have in my bag of
> tricks, as important as an RS232 breakout box was in the '80's.   Does
> anybody make a commercial one?

Probably pricy, but Micro Computer Control makes commercial i2c stuff,
including bus monitors.    http://www.mcc-us.com/
Don't know what your scope budget is, but our HP (Agilent) 54622 works
VERY nicely for i2c work.  It can trigger on i2c stuff, including
address, but more importantly, the so-called "deep memory" on this scope
lets you capture a ton of data, which can still be expanded and examined
one pulse at a time.
I prefer the scope over a bus monitor, especially if you are brewing your
own i2c code.  There's no substitute for looking at the pulse train, vs.
what a monitor thinks that pulse train means.

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