Technical Information 1-11
The Flash ROM allows the system and video BIOS to be upgraded with the BIOS Update
utility, without having to physically remove the ROM (see Section 2 for further information
on the BIOS Update utility). The Flash ROM supports the reprogramming of the system
BIOS and the video BIOS.
The system memory map is shown in Table 1-3.
Table 1-3 System Memory Map
Memory Space
Size
Function
100000-10000000
383 MB
Extended memory
FC000-FFFFF
16 KB
Boot block
FA000-FBFFF
8 KB
ECSD (Plug and Play configuration and DMI)
F9000-F9FFF
4 KB
Reserved for BIOS
F8000-F8FFF
4 KB
OEM logo or Scan User Flash
E8000-F7FFF
64 KB
POST BIOS
E0000-E7FFF
32 KB
POST BIOS (Available as UMB)
C8000-DFFFF
96 KB
Available HI DOS memory (open to ISA and PCI bus)
A0000-C7FFF
160 KB
Video memory and BIOS
9FC00-9FFFF
1 KB
Extended BIOS data (moveable by memory manager
software)
80000-9FBFF
127 KB
Extended conventional memory
00000-7FFFF
512 KB
Conventional memory
I/O Addressing
The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex)
addresses of I/O devices are listed in Table 1-4. (In Plug and Play systems, these addresses
are typical but may vary by configuration.)
