NCR 7772 Series User Manual

Also see for 7772 Series: Instructions Kit instructions Kit instructions Instructions User guide

Contents

NCR 7772 Series User Manual Manual pdf 78 page image

Chapter 6: Power ManagementThe BIOS supports the Advanced Configuration and Power Management Interface(ACPI) 3.0 specification. A key feature of ACPI is that the operating system, not theBIOS, configures and implements power management. The CX7 terminal supports theGlobal system power states defined by ACPI.Computer StatesG3 Mechanical OffA computer state that is entered and left by a mechanical meansExample: Turning off the system's power through the movement of a large red switch.Various government agencies and countries require this operating mode. It is impliedby the entry of this off state through a mechanical means that no electrical current isrunning through the circuitry and that it can be worked on without damaging thehardware or endangering service personnel. The OS must be restarted to return to theWorking state. No hardware context is retained. Except for the real-time clock, powerconsumption is zero.G2/S5 Soft OffA computer state where the computer consumes a minimal amount of power. No usermode or system mode code is run. This state requires a large latency in order to returnto the Working state. The system's context will not be preserved by the hardware. Thesystem must be restarted to return to the Working state. It is not safe to disassemble themachine in this state.G1 SleepingA computer state where the computer consumes a small amount of power, user modethreads are not being executed, and the system appears to be off (from an end user'sperspective, the display is off, and so on). Latency for returning to the Working statevaries on the wake environment selected prior to entry of this state (for example,whether the system should answer phone calls). Work can be resumed withoutrebooting the OS because large elements of system context are saved by the hardwareand the rest by system software. It is not safe to disassemble the machine in this state.