// main.c
extern void __cdecl far interrupt keyboardHandler();
extern char keyboardPressed;
void far (interrupt *int9Save)();

int main(void) {
  int9Save = _dos_getvect(9);
  _dos_setvect(9, keyboardHandler);

  while (keyboardPressed == 0) {
    printf("%d\n", keyboardPressed);
  }

  printf("wow\n");
  delay(200);

  _dos_setvect(9, int9Save);

  return 0;
}