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From: "Clive Mayo" <cm AT ttl-3d DOT co DOT uk>
To: <cygwin AT cygwin DOT com>
Subject: Read/write IO ports on NT
Date: Tue, 24 Jul 2001 11:15:40 +0100
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Hi

Trying to read and write directly at IO port on NT, using the following code

int main()
{
 __asm("mov $1, %al");
 __asm("mov $0x3f8, %dx");
 __asm("out %al, %dx");
 return 0;
}

also tried

int main()
{
 _outp(0x378, 1);
 return 0;
}

but get the following exception, Privileged instruction.
Any suggestions or pointers of how to code this.

Clive Mayo


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