DFI BL600-D - Manual (Page 79)

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BIOS Setup
Onboard LAN Boot ROM
Enable this field if you wish to use the boot ROM (instead of a disk
drive) to boot-up the system and access the local area network
directly.
If you wish to change the boot ROM’s settings, type the and
keys simultaneously when prompted during boot-up. Take
note: you will be able to access the boot ROM’s program (by typing
+ ) only when this field is enabled.