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6.2 System Driver
6.2.1 Function
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.
6.2.2 Startup 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.