The pro-level trick was to make that string exactly 13 characters long. Since the screen was 40 characters wide (at least on the Apple ][ it was), the print wo

The pro-level trick was to make that string exactly 13 characters long. Since the screen was 40 characters wide (at least on the Apple ][ it was), the print would happen 3 times and then the next one would wrap around and be offset by 1 character on the next line. This had the effect of making the words appear to smoothly scroll horizontally across the screen as the text rolled vertically.