37
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 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.