// 2_12.cpp : Defines the entry point for the console application.

#include "stdafx.h"

#include <PCIXP.h>

#include <conio.h>

#include <stdio.h>

int main(int argc, char* argv[])

{

unsigned int Freg;

int Base;

unsigned int Hesochia;

Base=Get_Addr("PCI_8255");

outportb(Base+11,0xB6);

printf("Nhap tan so: "); scanf("%d",&Freg);

do

{

Hesochia=1000000/Freg;

outportb(Base+10,Hesochia);

outportb(Base+10,Hesochia>>8);

if(getch()=='t') Freg+=100;

else if(getch()=='g') Freg=Freg-100;

}while(kbhit()!=1);

return 0;

}