The start address can be manipulated to achieve horizontal and/or vertical hardware scrolling:
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*To move right: <code>start_address := start_address + 1</code>*To move left: <code>start_address := start_address - 1</code>*To move down: <code>start_address := start_address + R1</code>*To move up: <code>start_address := start_address - R1</code>
However, it is a position in word (16 bits), not in byte. So, the screen will move two bytes at a time horizontally. Also, the precision will be one CRTC character vertically.