More of a PC hardware question really...
I want to attach a scope probe to a PC to detect program activity...(newish model, no ISA, running W2000).
The general idea is that I can write a test instruction in my C++ program, and this would cause a blip on the scope when the instruction gets executed. The purpose is to get visual information about program timings etc..
The pulse has to come out very, very soon after the instruction gets executed, and not be delayed by the OS stack (otherwise I would have done something like sending an edge to a serial port RTS line, or use the sound card/joystick)
The shape of the pulse is irrelevant, I just want a positive reaction that can be detected by a scope probe.
Any bright ideas how I can do this???
TIA
ted