import "uw8.ram" memory(2);
import "uw8.time" global mut time: i32;

export fn tic() {
  let i: i32;
  loop frame {
    i?120 = (i % 320 + time / 10) ^ (i / 320);
    branch_if (i := i + 1) < 320*256: frame;
  }
}