SQ576
4-10
4.4.12
Assign IRQ for VGA
Assign the IRQ# for VGA card.
4.4.13
OS select for DRAM > 64MB
Select OS2 only if you are running OS/2 operating system with greater than 64 MB of RAM
on your system.
4.4.14
Shadow
Software that resides in a read-only memory (ROM) chip on a device is called firmware. The
Award BIOS permits shadowing of firmware such as the system BIOS, video BIOS, and
similar operating 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) available 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 remaining 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.
Содержание SQ576
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Страница 47: ...SQ576 Documentation Rev Number A02 May 1997 ...