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HP Compaq d330 DT - Acpi Support; Usb Legacy Support

HP Compaq d330 DT
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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
8-19

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