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i'd like to ask a simple, yet confusing to me, question about
ioperm.ioperm is like this:
#include <unistd.h> /* for libc5 */
#include <sys/io.h> /* for glibc */
int ioperm(unsigned long from, unsigned long num, int turn_on);
where from is the address of the beginning port, num is the number of
bytes and turn_on it the value of the permissions.(but i suppose you
already knew that).
My question is: can someone explain to me what a port is? How many bytes
does it have? How do I know how many ports a device has? Is there a
difference between the ports of my ,say, parallel connector and my
serial one? Differences between my serial connector and my sound card
port? (ok, that's not ONE question but...) I'm totally confused...
So, any ideas? ...someone...plz?
I'd really appreciate if you gave me something like a schematic or
thnx in advance
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