Technical Information 1-9
System and Video BIOS
The system and video BIOS are stored in a DMI-compliant, 2 MB (256K x 8) flash memory
device (Flash ROM). The system BIOS uses 64 KB and the video BIOS uses 32 KB. The
system BIOS is capable of being shadowed and cached through the system’s Setup utility
(see Section 2 for Setup information). System BIOS is write protected and automatically
enabled.
In addition to the system and video BIOS, the flash device contains the Setup Utility
program described in Section 2, Power-On Self-Tests, and Advanced Power Management
routines.
The BIOS programs execute the Power-On Self-Test, initialize processor controllers, and
interact with the display, diskette drives, hard disks, communication devices, and
peripherals. The Setup utility default copies the ROM BIOS into RAM (shadowing) for
maximum performance.
The Flash ROM allows the system and video BIOS to be upgraded with the BIOS Update
utility, without removing 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 provided in Table 1-4.
Table 1-4 System Memory Map
Memory Space
Size
Function
00000-7FBFF
512K
Conventional base memory
80000-9FBFF
127K
Extended conventional
9FC00-9FFFF
1K
Extended BIOS data
A0000-C7FFF
160K
Video memory and BIOS
C8000-DFFFF
96K
Available HI DOS memory (open to
ISA and PCI bus)
E0000-E7FFF
32K
Post BIOS area
E8000-E8FFF
4K
OEM Logo area or scan user flash
E9000-E9FFF
4K
Reserved for BIOS
EA000-EBFFF
8K
DMI configuration info (VPD ESCD)
EC000-EFFFF
16K
Boot Block (available as UMB)
F0000-FFFFF
64K
Main BIOS
100000-C000000
191M
Extended memory
Summary of Contents for POWERMATE P2166
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