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The system
memory map
Memory Address
100000-10000000
F0000-FFFFF
EC000-EFFFF
EA000-EBFFF
E9000-E9FFF
E8000-E8FFF
E0000-E7FFF
C8000-DFFFF
A0000-C7FFF
9FC00-9FFFF
80000-9FBFF
00000-7FFFF
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 U6520222D 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.
CMOS Memory/Real-Time Clock Battery
The 430TX PCI ISA IDE Xcelerator (PIIX4) on the system board stores system information in non-volatile
in shown in Table 1-2.
Table 1-2 System Memory Map
Size
255 MB
64 KB
16 KB
8 KB
4 KB
4 KB
32 KB
96 KB
160 KB
1 KB
127 KB
512 KB
Function
Extended Memory
BIOS
Boot Block
(available as UMB)
ECSD
(Plug and Play configuration and DMI)
Reserved for BIOS
OEM Logo or Scan User Flash
POST BIOS (available as UMB)
Available High DOS memory
(open to ISA and PCI bus)
Video memory and BIOS
Extended BIOS Data
(moveable by memory managers)
Extended conventional memory
Conventional memory
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