gregory.menke@gsfc.nasa.gov wrote:
> Yes, though now they are often implemented as #defines.  On the x86,
> you have IO and memory accesses, so the operations are different. 

On PCI based systems running in protected mode, IO access is considered just one step short of deprecated.  PCI spec recommends memory access only, and some newer PCI devices do not implement I/O access at all.
Because of legacy support, i.e. even the newest X86 servers can still boot DOS, devices which can be boot devices typically still implement I/O access, but it is for legacy support only.

-- Chris Caudle


