> I was following the NMI discussion and today I have fond, under a pile of
> old DDJ issues, an old manual which explain something (really not much)
> about NMI on the old 80286 PC/XT. Supposing the NMI mechanism is not
> changed for (23456)86, this is a patch that can help detect if the NMI is
> a real hardware failure or triggered by something else.
>
> [skipped]
>
My references say that bits 6 and 7 of port 0x61 are valid only if you set bits
2 and 3 to one. Bit 2 controls RAM parity error and bit 3 controls IO parity. To
set this up, you have to say something like:
outb( inb_p(0x61) | 0x0C, 0x61);
but I didn't find this in the kernel anywhere, so your code may not do anything.
John