Specifications

5.3.5.1 System Board Extended Memory

This function indicates the amount of extended memory (memory addressable

beyond 1 MB) resident on the system board and on an optional memory

expansion module (if installed). The amount of extended memory is

automatically detected and cannot be modiﬁed using the SCU.

Note

Extended memory installed on EISA or ISA boards is not included in

the quantity of extended memory indicated.

5.3.5.2 System Base Memory

System base memory is automatically detected by the POST. It selects 640 KB

unless you have an expansion board that uses the address space between

512 KB and 640 KB.

5.3.5.3 Shadow Off-Board Video BIOS

The system board reserves an area of fast 32-bit DRAM for a copy of off-board

video BIOS. If you choose to shadow off-board video BIOS, the computer copies

the video BIOS to the appropriate area in DRAM and disables the slower ROM.

Faster graphics performance may be obtained if you choose to shadow off-board

video BIOS.

Note

Only EGA and VGA video controllers have a video BIOS that can

be shadowed. Some high-resolution monitor controllers do not work

properly when video BIOS is shadowed. If you have a high-resolution

monitor controller installed and you experience monitor problems,

select "Disable off-board video BIOS."

5.3.5.4 User Deﬁnable Hard Disk Drive

System BIOS contains a table of drive types for IDE hard disk drives. Of

these, you can deﬁne the number of sectors, cylinders, heads, and so on, for

types 2 and 3 or types 48 and 49. Choose types 48 and 49, unless the local area

network (LAN) software does not recognize them.

5–16 System Conﬁguration