IBASE SI-28 - Manual (Page 23)

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Advanced BIOS Features
This section allows you to configure and improve your system and allows you to set
up some system features according to your preference.
CPU Feature
Press Enter to configure the settings relevant to CPU Feature.
Hard Disk Boot Priority
With the field, there is the option to choose, aside from the hard disks connected,
“Bootable add-in Cards” which refers to other external devices.
Virus Warning
If this option is enabled, an alarm message will be displayed when trying to write on
the boot sector or on the partition table on the disk, which is typical of the virus.
CPU Internal and External Cache
Cache memory is additional memory that is faster than conventional DRAM
(system memory). CPUs from 486-type on up contain internal cache memory, and
most, but not all, modern PCs have additional (external) cache memory. When the
CPU requests data, the system transfers the requested data from the main DRAM
into cache memory, for even faster access by the CPU. These allow you to enable
(speed up memory access) or disable the cache function.