ADLINK NuPRO-A331 - Manual (Page 79)

BIOS Setup 65
NuPRO-A331
5.5.2 Boot Device Priority
The items allow you to set the sequence of boot devices where
BIOS attempts to load the disk operating system. First press
<Enter> to enter the sub-menu. Then you may use the arrow
keys to select the desired device, then press <+>, <-> or
<PageUp>, <PageDown> key to move it up/down in the priority
list.
5.5.3 Boot Device Groups
The Boot devices are listed in groups by device type. First
press <Enter> to enter the sub-menu. Then you may use the
arrow keys to select the desired device, then press <+>, <-> or
<PageUp>, <PageDown> key to move it up/down in the priority
list. Only the first device in each device group will be available
for selection in the Boot Device Priority option.