Casio IT-2000W manual Loading MS-DOS, YES Reset Button

4.MS-DOS

4.1Overview

In general, if a personal computer is booted-up with a floppy disk in the drive, first an attempt will be made to read MS-DOS from the floppy disk, and if a copy of MS-DOS does not reside on the floppy it is loaded from the hard disk (C:).

However, this method cannot be used on this terminal since its basic drive (C:), which corresponds to the hard disk of a PC, is defined as a read-only device. The MS-DOS on the boot drive (C:) can be loaded initially provided that no PC card is inserted in the slot, but, in this case, it is not possible to add the start-up code for user programs to the AUTOEXEC.BAT file. This problem is solved on the￿terminal as follows.

At boot-up this terminal searches each drive to locate the CONFIG.SYS and AUTOEXEC.BAT files and sets it as the current drive, then MS-DOS is loaded into the main memory. As a result, the CONFIG.SYS and AUTOEXEC.BAT files in the current drive can be processed through MS-DOS.

The CONFIG.SYS and AUTOEXEC.BAT files will be searched in the following order: ￿PC card drive -> RAM disk -> F-ROM drive -> Basic drive

The CONFIG.SYS and AUTOEXEC.BAT files on the basic drive will be executed only if the RESET switch is pressed. As a result, the System Menu, which is the maintenance program for this terminal, will be initiated.

Since the main part of MS-DOS is always loaded from the basic drive (C:) in this case, it is not necessary to install MS-DOS and COMMAND.COM on the user drive.

Fig. 4.1	LOADING MS-DOS
YES	NO
	RESET BUTTON
	was pressed?

Specifies the basic drive as the current drive.

Specifies the drive on which CONFIG.SYS and AUTOEXEC.BAT reside as the current drive.

Load MS-DOS.

Executes CONFIG.SYS and AUTOEXEC.BAT in the current drive.

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