>It's a matter of perspective. :)
>
>The PowerPC architecture has no "IO" instructions; therefore all IO
>accesses are MMIO.
>
>However, you can place devices with IO ports in a PowerPC system. In
>this case, the bridges are configured to translate MMIO accesses coming
>from the processor into IO port accesses on the bus. It is quite common
>to find standard x86 ISA devices, such as a SuperIO chip, in PowerPC
>systems.
>
That is exactly what IA64 architecture takes.
I guess PIO is X86 historic issue when there as only 16 bits bus 20
years ago.
And it is probably due to 8085 which is for embedded system. 
All other archs may support PIO due to plenty of X86 devices, but do
emulating PIO
in chipset/bridge like PPC/IA64.

Of course except S390 which is really different and doesn't want to take
"open" devices:(

Eddie.

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