Technical Reference Guide
8.7.2 ACPI SUPPORT
This system meets the hardware and firmware requirements for being ACPI compliant.
This system supports the following ACPI functions:
♦ PM timer
♦ Power button
♦ Power button override
♦ RTC alarm
♦ Sleep/Wake logic (S1,S3, S4 (Windows 2000), S5)
♦ C1 state (Halt)
♦ PCI Power Management Event (PME)
8.8 USB LEGACY SUPPORT
The BIOS ROM checks the USB port, during POST, for the presence of a USB keyboard. This
allows a system with only a USB keyboard to be used during ROM-based setup and also on a
system with an OS that does not include a USB driver.
On such a system a keystroke will generate an SMI and the SMI handler will retrieve the data
from the device and convert it to PS/2 data. The data will be passed to the keyboard controller and
processed as in the PS/2 interface. Changing the delay and/or typematic rate of a USB keyboard
though BIOS function INT 16 is not supported.
hp compaq d330 and d530 Series of Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - June 2003
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