#include "dos.h"

void interrupt mytimer();

void interrupt (*prevtimer)();

int running=0;

char far *vdu;

char far *mode;

unsigned long far *time=(unsigned long far*)0x46c;

main()

//AIM : to make the tsr clock which will display time at the top right corner

// right now not working

{

unsigned long far *clkint;

clkint=(unsigned long far*)32;

mode=(char far*)0x410;

if((*mode&0x30)==0x30)

*vdu=0xb0000000l;

else

*vdu=0xb8000000l;

prevtimer=(void (interrupt *far)())*clkint;

*clkint=(unsigned long)mytimer;

keep(0,1000);

return 0;

}

void interrupt mytimer()

{

unsigned char hh,mm,ss;

void writechar(char,int,int,int);

if(running==0)

{

running=1;

hh=(*time/65520);

mm=(*time-hh*65520)/1092;

ss=(*time-hh*65520-mm*1092)*10/182;

if(ss>=60)

{

ss-=60;

mm++;

if(mm>=60)

{

mm=0;

hh++;

if(hh>=24)

{

hh=0;

}//if(hh>=24)

}//if(mm>=60)

}//if(ss>=60)

writechar(48+hh/10,0,72,112);

writechar(48+hh%10,0,73,112);

writechar(48+':',0,74,112);

writechar(48+mm/10,0,75,112);

writechar(48+mm%10,0,76,112);

writechar(48+':',0,77,112);

writechar(48+ss/10,0,78,112);

writechar(48+ss%10,0,79,112);

running=0;

}//if(running==0)

(*prevtimer)();

}//main()

void writechar(char ch,int row,int col,int attr)

{

*(vdu+row*160+col*2)=ch;

*(vdu+row*160+col*2+1)=attr;

}