Allen Martin wrote:
Nothing inside the chipset should be decoding port 80 writes. It's possible this board has a port 80 decoder wired onto the board that's misbehaving. I've seen other laptop boards with port 80 decoders
wired onto the board, even if the 7 segment display is only populated
on debug builds.
This is very helpful. So the next question is there something on the laptop mainboard.

Any idea how to look for such a thing? I am not averse to taking the laptop apart to look at the mainboard.
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