Sbc-comm AMD SBC-770 User Manual download pdf (Page 70)

Chapter 3 Award BIOS Setup 59

PS/2 Mouse Function Control

If your system has a PS/2 mouse port and you install a serial

pointing device, select Disabled.

Shadow

Software that resides in a read-only memory (ROM) chip on a

device is called firmware. The AwardBIOS permits shadowing of

firmware such as the system BIOS, video BIOS, and similar operat-

ing instructions that come with some expansion peripherals, such

as, for example, a SCSI adaptor.

Shadowing copies firmware from ROM into system RAM, where

the CPU can read it through the 16-bit or 32-bit DRAM bus.

Firmware not shadowed must be read by the system through the 8-

bit X-bus. Shadowing improves the performance of the system

BIOS and similar ROM firmware for expansion peripherals, but it

also reduces the amount of high memory (640 KB to 1 MB) avail-

able for loading device drivers, etc.

Enable shadowing into each section of memory separately. Many

system designers hardwire shadowing of the system BIOS and

eliminate a System BIOS Shadow option.

Video BIOS shadows into memory area C0000-C7FFF. The remain-

ing areas shown on the BIOS Features Setup screen may be

occupied by other expansion card firmware. If an expansion

peripheral in your system contains ROM-based firmware, you need

to know the address range the ROM occupies to shadow it into the

correct area of RAM.

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Sbc-comm AMD SBC-770 User Manual Page 70