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Character Eater

#include"dos.h" #include<conio.h> #include<stdlib.h> void interrupt (*prevtimer)(); void interrupt mytimer(); void writechar(char ch,int row,int col,int attr); char far* scr; int a,b; void main() { scr=(char far*) 0xb8000000; prevtimer=getvect(8); setvect(8,mytimer); keep(0,1000); } void interrupt mytimer() { a=random(25); b=random(80); writechar(' ',a,b,0); (*prevtimer)(); } void writechar(char ch,int row,int col,int attr) { *(scr+row*160+col*2)=ch; *(scr+row*160+col*2+1)=attr; }