> One wonders if it does some SMM trick to capture port 0x80 writes and 
quoted text
> attempt to haul them off for debugging; it almost sounds like some kind 
> of debugging code got let out into the field.

Not implausible. We've got a bug I've been dealing with where a vendor
left debug stuff enabled via the parallel port and which clearly
"escaped" from the test environment to the BIOS proper.
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