User Guide

FIRST INTERNATIONAL COMPUTER,

INC.

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mode (S4 state) and Soft OFF(S5 state).

5.2 Global System State Definitions

Global system states (Gx states) apply to the entire system and are visible to the

user.

Following is a list of the system states:

G0/S0 - Working:

A computer state where the system dispatches user mode (application) threads

and they execute. In this state, devices (peripherals) are dynamically having their

power state changed. The user will be able to select (through some user interface)

various performance/power characteristics of the system to have the software

optimize for performance or battery life. The system responds to external events in

real time. It is not safe to disassemble the machine in this state.

G1 - Sleeping:

A computer state where the computer consumes a small amount of power, user

mode threads are not being executed, and the system “appears” to be off (from an

end user’s perspective, the display is off, etc.). Latency for returning to the

Working state varies on the wakeup environment selected prior to entry of this

state (for example, should the system answer phone calls, etc.). Work can be

resumed without rebooting the OS because large elements of system context are

saved by the hardware and the rest by system software. It is not safe to disassemble

the machine in this state.

G2/S5 - Soft Off:

A computer state where the computer consumes a minimal amount of power. No

user mode or system mode code is run. This state requires a large latency in order

to return to the Working state. The system’s context will not be preserved by the

hardware. The system must be restarted to return to the Working state. It is not

safe to disassemble the machine.

G3 – Mechanical Off:

A computer state that is entered and left by a mechanical means. It is implied by

the entry of this off state through a mechanical means that the no electrical

current is running through the circuitry and it can be worked on without

damaging the hardware or endangering the service personnel. The OS must be

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