The HD66750/1, dot-matrix graphics LCD controller and driver LSI, displays 128-by-128-dot graphics for four monochrome grayscales. Since the HD66750/1 incorporates bit-operation functions and a 16-bit high-speed bus interface, it enables efficient data transfer and high-speed rewriting of data in the graphics RAM. The following functions allow the user to easily see a variety of information: a smooth scroll display function that fixed-displays a part of the graphics icons and perform vertical smooth scrolling of the remaining bit-map areas, a double-height display function, and a hardware-supported window cursor display function.