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Write protect
Checking this box enables write protection for the
associated shadowed address range.
The normal state for this option will be disabled, the box not
checked. It is extremely rare for software to attempt to write
to ROM address ranges, and leaving write protection
disabled results in a performance advantage.
If you enable write protection then shadowed ROM spaces
can never be overwritten, this is safer, but results in lower
performance.
Adapter BIOS
BIOS on the expansion cards is stored in ROM which has
long access times. Enabling BIOS shadowing enhances
performance by copying the contents of the ROM into
RAM.
By copying the BIOS into RAM the system takes
advantage of the shorter access times of RAM. An
additional benefit is that shadowed ROM spaces are
cached gaining a further performance advantage.
Shadow
Checking this box enables BIOS shadowing for the
associated address range.
Warning
Shadowing is only appropriate for adapter ROM. It must
never be enabled for adapter card RAM in these regions.
Write protect
Checking this box enables write protection for the
associated shadowed address range.
The normal state for this option will be disabled, the box not
checked. It is extremely rare for software to attempt to write
to ROM address ranges, and leaving write protection
disabled results in a performance advantage.
18
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