Changes

The start address can be manipulated to achieve horizontal and/or vertical hardware scrolling. : *To move right: start address = start address + 1*To move left: start address = start address - 1*To move down: start address = start address + R1*To move up: start address = start address - R1 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.