I saw that this question had been asked before, but I can't find
an answer. I need to know at what point is the pin sampled
during an inp instruction. As near as I can tell it seems to be
during the falling edge of the clock, but I'm just guessing since
that may be causing me some problems.
The part I'm using is a 2313. Is there a timing diagram of the
i/o pins somewhere? Doesn't appear to be in the doc0839.pdf.