Casio IT-2000W manual Software Functions, Hardware Window, Contrast Adjustment

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.

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