Acer Altos 900 Pro, Руководство пользователя

Страница: 55 / 98

2-14 User’s Guide
2.3.1 Shadow RAM
The system reserves 384 KB of random access memory (RAM) for
the shadow RAM function. This parameter has eight range
addresses. When you set these addresses to
Enabled , the system
BIOS, video BIOS, and I/O ROM functions run directly from the
shadow RAM for faster operation. When you set them to
Disabled ,
the functions run normally from ROM.
The address range E0000h - FFFFFh is for shadowing the system
BIOS. This item is always set to
Enabled and is not user-
configurable. The address range C0000h - C7FFFh is for shadowing
the video BIOS. This item is fixed to
Enabled and is not user-
configurable if the Auto Configuration Mode and the Fast Boot Mode
parameters on page 2 of the Basic System Configuration menu are
enabled. Otherwise, you can disable this item.
The remaining address ranges are for I/O ROM functions.
2.3.2 L1 & L2 Cache (CPU Cache)
This parameter enables or disables the first- and second-level cache
memory integrated in the Pentium Pro CPU. This item is fixed to
Enabled and is non-configurable if you enabled the Auto
configuration Mode and Fast Boot Mode parameters on page 2 of the
Basic System Configuration menu. Otherwise, you can disable this
item.
2.3.3 Cache Scheme
This parameter allows you to select Write back or Write through
for the cache mode. Write back updates the cache but not the
memory when there is a write instruction. It updates the memory only
when there is an inconsistency between the cache and the memory.
Write through updates both the cache and the memory whenever
there is a write instruction.