Casio IT-2000D - Manual (Page 19)

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2.2 Basic System Operation
2.2.1 Overview
Basic operation of this system on the terminal consists of the suspend/resume process and boot
process operated by means of the Power switch and RESET switch, as shown in the following
diagram.
Fig. 2.3
During normal operation the system status will move between the ON state and the OFF state,
shown in the above diagram, by pressing the power key.
The SUSPEND state is a state from which the previous state can be returned to at any time. The
process of returning from the SUSPEND state to the ON state is called the resume process.
The RESET switch is used to either re-start the system or to initiate the System Menu, which is the
maintenance program. Press this RESET switch to start hardware initialization followed by initiation
of the System Menu. This process is called the System Menu boot process.
If an OFF event occurs while the System Menu is operating, the system shifts to the OFF state.
If the ON key is pressed in the OFF state, the boot process is executed again and an appropriate
application program will be loaded. This process is called the application boot process.
ON STATE
SUSPEND
STATE
OFF STATE
System Menu
OFF Process
OFF EVENT RESET SWITCH
System Menu BOOT
RESET SWITCH
System Menu BOOT
ON EVENT
ON Process
ON KEY
Application BOOT
OFF Process
OFF EVENT
INITIAL STATE
ON KEY
System Menu BOOT