Chapter 1: Product Overview 1-13
APM BIOS States
Definition
•
System is in a low power state with some power
savings.
•
Most devices are in a low power mode.
•
The CPU clock is slowed or stopped.
•
Operational parameters are retained.
•
System returns quickly to the APM Enabled State.
•
The Resume Timer event must return the system
to the APM Enabled state.
•
User activity may be required to return the system
to the APM Enabled State.
•
The operating system is notified after the system
transitions to the APM Enabled State.
•
Prior operation resumes after returning to the
APM Enabled state.
•
Interrupts must still be processed normally. This
may require waking up the CPU temporarily if it
was stopped.
•
The CPU may be stopped again when the APM
Driver calls the CPU Idle function.
Some (not all) specific device states:
•
Hard Drive: Standby (motor not spinning,
interface buffer active)
•
Display: CRT – Suspend (No image on screen,
LCD – Off
•
Video Controller: Standby
•
Chipset: Standby
APM Standby
Entry 1.
Programmable timeout.
Summary of Contents for RealPOS 80c
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