> Now what's interesting is that the outb to port 80 is *faster* than an 
> outb to an unused port, on my machine.  So there's something there - 
> actually accepting the bus transaction.   In the ancient 5150 PC, 80 was 

Yes and I even told you a while back how to verify where it is. From the
timing you get its not on the LPC bus but chipset core so pretty
certainly an SMM trap as other systems with the same chipset don't have
the bug. Probably all that is needed is a BIOS upgrade

Alan