1-4 Technical Information
Expansion Bus
The expansion bus contains one ISA slot and two PCI slots. The PCI ISA IDE
Xcelerator chip (PIIX4E) provides the logic that enables the ISA bus functions.
With 24-bit memory addressing, a 16-bit data path, and an eight MHz clock, the
ISA bus is designed to support all peripherals compatible with the IBM
®
AT™
standard. For PCI functions, the Xcelerator chip provides 32-bit memory
addressing, 32-bit data path, and a 33-MHz clock speed.
BIOS
The BIOS (Basic Input Output System) is stored in the Intel 28F002 Flash
EPROM. The Flash EPROM is reprogrammable and allows fast, economical
BIOS upgrades.
The system memory map is shown in the following table.
System Memory Map
Memory Address
Size
Function
100000-18000000
383 MB
Extended memory
E8000-FFFFF
96 KB
System BIOS
E0000-E7FFF
32 KB
System BIOS (available as
UMB)
C8000-DFFFF
96 KB
Available high DOS memory
(open to ISA and PCI bus)
A0000-C7FFF
160 KB
Video memory and BIOS
00000-9FFFF
640 KB
Conventional memory
Plug and Play Support
The system comes with Plug and Play BIOS technology. Plug and Play
eliminates complicated setup procedures for installing Plug and Play expansion
boards.
To add a Plug and Play expansion board, simply power off the system, install
the board, and power on the system. There are no jumpers to set and no system
resource conflicts to resolve. Plug and Play automatically configures the board
for the system. The system also supports non-Plug and Play boards.
Plug and Play is controlled by the Plug and Play BIOS and the system’s
operating system. The Plug and Play BIOS is stored in the Intel 28F002 Flash
EPROM on the system board.
The Plug and Play BIOS adds several steps to the POST process. During POST,
the Plug and Play evaluates the configuration of installed boards and assigns
available system resources to the devices. On completion of Plug and Play
POST, the operating system checks to see if there are any additional resources
required, then assigns available resources to the devices.
