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Software Functions
Standard Video BIOS is supported. This supports the following video modes:
Mode No Mode Type Characters Resolution Colors Memory Segment
00h Text 40 x 25 320 x 200 16 B800h
01h Text 40 x 25 320 x 200 16 B800h
02h Text 80 x 25 640 x 200 16 B800h
03h Text 80 x 25 640 x 200 16 B800h
04h Graphics 320 x 200 4 B800h
05h Graphics 320 x 200 4 B800h
06h Graphics 640 x 200 2 B800h
07h Text 80 x 25 640 x 350 2 B000h
0Dh Graphics 320 x 200 16 A000h
0Eh Graphics 640 x 200 16 A000h
10h Graphics 640 x 350 16 A000h
11h Graphics 640 x 480 2 A000h
12h Graphics 640 x 480 16 A000h
Hardware Window
The hardware window provides the superimpose function for the VGA controller.
With this hardware window a pop-up screen can be displayed without affecting the operation of
the application program. This hardware window is used in the keypad driver and various utility
programs.
Contrast Adjustment
The contrast of the liquid crystal display automatically compensates for temperature changes.
The user can adjust the offset value (refer to Chapter 5 “Keyboard Controller”) for the automatically
adjusted contrast in the following ways.
Press the 8 key after the Fn key to increase the contrast offset one step.
Press the 9 key after the Fn key to decrease the contrast offset one step.
Call the system library to increase/decrease the contrast offset.