Art,
You're gonna love this!
With the cable unplugged, all port 2 pins show red except 11 which is green, Grounding pin 5 to 25 causes pin 9 to go green and 11 to go red. Grounding pin 9 to 25 causes pins 5 and 15 to go green!
If I ground pin 5, causing pin 9 to go green then quickly ground 9, it doesn't go red right away but does after the same delay that occurs if I just remove the jumper. In other words, the floating inputs appear to take some time to bleed off and grounding pin 9 does not show as an immediate grounding. However, removing the jumper from pin 9 does cause an immediate change in pins 5 and 15 back to red. I believe this shows that pin 9 in Darwin is not really pin 9.
Anyone have an exorcism routine other than Unix?
Peter