Aaeon SBC-555 Manual page 42

CPU Internal Cache/External Cache
These two categories speed up memory access. However, it
depends on CPU/chipset design.
Quick Power On Self Test
This category speeds up Power On Self Test(POST) after you
power up the computer. If it is set to Enable, BIOS will shorten or
skip some check items during POST.
Boot Sequence
This category determines which drive to search first for the disk
operating system (i.e., DOS).
Swap Floppy Drive
This item allows you to determine whether you want to swap
floppy drive or not.
Boot Up Floppy Seek
During POST, BIOS will determine if the floppy disk drive
installed is 40 or 80 tracks. 360K type is 40 tracks while 760K,
1.2M and 1.44M are all 80 tracks.
Boot Up NumLock Status
This allows you to determine the default state of the numeric
keypad.
Boot Up System Speed
This allows you to determine the Boot Up Speed. The choice is
High / Low.
Gate A20 Option
This entry allows you to select how the gate A20 is handled. The
gate A20 is a device used to address memory above 1 Mbytes.
Initially, the gate A20 was handled via a pin on the keyboard.
Today, while keyboards still provide this support, it is more
common, and much faster, for the system chipset to provide
support for gate A20.