On Thu, 14 Mar 2002, Richard B. Johnson wrote:
>
> Well I can see why he's an EX-Phoenix BIOS developer. A port at 0xed
> does not exist on any standard or known non-standard Intel/PC/AT
> compatible.
Note that "doesn't exist" is actually a _bonus_. It means that no
controller will answer to it, which causes the IO to time out, which on a
regular ISA bus will also take the same 1us. Which is what we want.
Real ports with real controllers can be faster - they could, for example,
be fast motherboard PCI ports and be positively decoded and be faster than
1us.
Linus
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This archive was generated by hypermail 2b29 : Fri Mar 15 2002 - 22:00:18 EST