People,

I have the need to record the pulse width and duty cycle of a square wave
output of one PIC pin (using the 16C71), but I am really short on
sophisticated instrumentation, analyzers, etc.  My idea is to hook the
output pin into the joystick port on a standard PC, which accepts up to 5V
input.  Reading the port is trival and should be able to be done at quite a
rapid sampling rate.  My intent is to record the elapsed time between pulses
and output it to a file for later analysis.

My only question (not being an EE, myself) is what I should watch out for in
terms of rise/fall times in driving the joystick port?  Should I measure
anything first to make sure that it's possible?  Impedance?

I'd like to get as accurate a pulse width measurement as possible, but would
also like to make it as simple as possible.

Thanks for any advice.

--Andrew
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