#include<stdio.h>
#include<dos.h>
#include<conio.h>
#include<math.h>
#include<string.h>
#include<ctype.h>
#include<graphics.h>
#include<stdlib.h>

void interrupt our();
void interrupt (*prev)();

char far *cplock;

main()
{
	printf("\ncaps lock turned on\n");
	cplock = (char far *)0x417;
	prev = getvect(8);
	setvect(8,our);
	keep(0,1000);
}
void interrupt our()
{
	(*prev)();
	(*cplock) |= 64;
}