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Chapter 8 System BIOS
8.5.3 TEMPERATURE STATUS
The BIOS includes a function (INT15, AX=E816h) to retrieve the status of a system’s interior
temperature. This function allows an application to check whether the temperature situation is at a
Normal, Caution, or Critical condition.
8.5.4 DRIVE FAULT PREDICTION
The Compaq BIOS directly supports Drive Fault Prediction for IDE-type hard drives. This feature
is provided through two Client Management BIOS calls. Function INT 15, AX=E817h is used to
retrieve a 512-byte block of drive attribute data while the INT 15, AX=E81Bh is used to retrieve
the drive’s warranty threshold data. If data is returned indicating possible failure then the
following message is displayed:
“1720-SMART Hard Drive detects imminent failure”
8.6 POWER MANAGEMENT FUNCTIONS
The BIOS provides two types of power management support: independent PM support ACPI
support.
NOTE: The D315 models support both the independent PM (aka “APM”) and the ACPI
Modes. The d325 models support only the ACPI mode.
8.6.1 INDEPENDENT PM SUPPORT (D315 only)
The BIOS can provide power management (PM) of the system independently from an operating
system that doesn’t support APM (including DOS, Unix, NT & older versions of OS/2). In the
Independent PM environment the BIOS and hardware timers determine when to switch the system
to a different power state. State switching is not reported to the OS.
8.6.1.1 Staying Awake In Independent PM
There are two "Time-out to Standy" timers used in independent PM: the System Timer
and the IDE Hard Drive Timer.
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Second Edition - April 2003
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