Acer 500L - Manual (Page 55)

Chapter 3 BIOS Utility 3-9
Main Board S/N
This parameter specifies the system board’s serial number.
System BIOS Version
This parameter specifies the version of the BIOS utility.
DMI BIOS Version
This parameter specifies the version of the DMI (Desktop
Management Interface) BIOS version. DMI enables software to collect
information about a computer environment.