On 30-12-07 16:28, Ingo Molnar wrote:
Reading from the 0x3cc port does not impact the cursor position update
sequence IIRC - i think the vidport is even ignored for the input
direction by most hardware, there's a separate input register. The 0x3cc
port is a well-defined VGA register which should be unused on non-VGA
hardware. (which makes it a perfect delay register in any case)
Hardly. Duron 1300 on AMD756:
rene@7ixe4:~/src/port80$ su -c ./port80
cycles: out 2400, in 2401
rene@7ixe4:~/src/port80$ su -c ./port3cc
cycles: out 459, in 394
As stated a few dozen times by now already, port 0x80 is _decidedly_ _non_
_random_
Rene.
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