Contrast Adjustment - Casio IT-2000W Technical Reference Manual

Software Functions
Standard Video BIOS is supported. This supports the following video modes:
Mode No Mode Type
00h Text
01h Text
02h Text
03h Text
04h Graphics
05h Graphics
06h Graphics
07h Text
0Dh Graphics
0Eh Graphics
10h Graphics
11h Graphics
12h Graphics
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 6 "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.
Characters Resolution
40 x 25 320 x 200
40 x 25 320 x 200
80 x 25 640 x 200
80 x 25 640 x 200
320 x 200
320 x 200
640 x 200
80 x 25 640 x 350
320 x 200
640 x 200
640 x 350
640 x 480
640 x 480
37
Colors Memory Segment
16 B800h
16 B800h
16 B800h
16 B800h
4 B800h
4 B800h
2 B800h
2 B000h
16 A000h
16 A000h
16 A000h
2 A000h
16 A000h