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Technical Reference Guide
Chapter 7
BIOS ROM
7.
Chapter 8 BIOS ROM
7.1 INTRODUCTION
The Basic Input/Output System (BIOS) of the computer is a collection of machine language
programs stored as firmware in read-only memory (ROM). The BIOS ROM includes such
functions as Power-On Self Test (POST), PCI device initialization, Plug ‘n Play support, power
management activities, and the Setup utility. The firmware contained in the BIOS ROM supports
the following operating systems and specifications:
♦ DOS 6.2
♦ Windows 3.1 (and Windows for Workgroups 3.11)
♦ Windows 95, 98SE, 2000, XP Professional, and XP Home
♦ Windows NT 4.0 (SP6 required for PnP support)
♦ OS/2 ver 2.1 and OS/2 Warp
♦ SCO Unix
♦ DMI 2.1
♦ Intel Wired for Management (WfM) ver. 2.2
♦ Alert-On-LAN (AOL) and Wake-On-LAN (WOL)
♦ ACPI and OnNow
♦ APM 1.2
♦ SMBIOS 2.3.1
♦ PC98/99/00 and NetPC
♦ Boot Integrity Services (BIS)
♦ Intel PXE boot ROM for the integrated LAN controller
♦ BIOS Boot Specification 1.01
♦ Enhanced Disk Drive Specification 3.0
♦ “El Torito” Bootable CD-ROM Format Specification 1.0
♦ ATAPI Removeable Media Device BIOS Specification 1.0
The BIOS ROM is a 512KB Intel Firmware Hub (or Firmware Hub-compatible) part. The runtime
portion of the BIOS resides in a 128KB block from E0000h to FFFFFh.
This chapter includes the following topics:
♦ ROM flashing (7.2) page 7-2
♦ Boot functions (7.3) page 7-4
♦ Setup utility (7.4) page 7-6
♦ Client management functions (7.5) page 7-13
♦ PnP support (7.6) page 7-15
♦ Power management functions (7.7) page 7-17
♦ USB legacy support (7.8) page 7-24
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
7-1