Well, the guy at VCF mapped the address, data and
register lines of a
Pentium (or 486, can't remember) to an oscilloscope. The scope would jump
all over the place based on what was being done inside the CPU.
This first mention I heard about his trick was for some big iron in the
1960s - I think Burroughs, but do not quote me on that.
William Donzelli
william(a)ans.net