cmos.c

一个用C语言编写的清除CMOS密码的小程序

#include <stdio.h>
#include <dos.h>

int main(void)
{

   int i;
   char final[9];
   unsigned char value[2];

   printf("BIOS Password Recovery Version 1.0\n");
   printf("By Amethyst\[e-mail]\n\n");

   outportb(0x70,0x1c);
   value[0]=inportb(0x71);
   outportb(0x70, 0x1d);
   value[1]=inportb(0x71);

   for(i=0;i<4;i++)
   {final[7-i]=(value[0] & 3) + 0x30;
   value[0]=value[0] >> 2;
   }

   for(i=0;i<4;i++)
   {final[3-i]=(value[1] & 3) + 0x30;
   value[1]=value[1] >> 2;
   }

   final[8]=0;

   printf("Your Supervisor BIOS password is %s \n", final);
   return 0;
}