Casio IT-2000W manual System Driver Function, Startup Method

7.2System Driver

7.2.1Function

The system driver (SYSDRV.SYS) must be installed because it executes critical processes in this ￿terminal. The system driver mainly performs the following processes.

LB1 monitoring and warning

Monitors the main battery conditions and sounds a warning buzzer if an LB1 event is detected. It also forcibly turns off the system, if the battery voltage has not recovered within ten minutes of

￿the buzzer sounding.

Alarm notification

When alarm (INT4Ah) occurs, the driver will hook the interrupt and ring the buzzer. And, the

￿driver will notify to the user.

Adjustment of the number of display lines

On a general VGA screen twenty five lines (if video mode=03h) of text are displayed. However, on this terminal, it is limited to twenty four lines because of the screen size.

To make display possible the system driver modifies the number of allowable lines to twenty four. The number of display columns has not been modified.

7.2.2Startup Method

This driver is loaded by defining the DEVICE statement in the CONFIG.SYS file. SYSDRV.SYS is stored in the basic drive (C:).

Format

DEVICE=C:￿SYSDRV.SYS

Start option

None

Note:

SYSDRV.SYS must be loaded before any device drivers.

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