As you would expect my working three examples have different BIOSs.
On this unit the DEL key got me into an AMIBIOS HIFLEX SETUP UTILITY VERSION 1.54.
Rather than the usual tabbed BIOS screens this one seemed to have grouped all the options into a list on the opening screen.
VIA Eden. DEL or F2
More conventional AMI BIOS v02.61
Boot settings seem a little odd. Boot Device Priority only appears if the BIOS finds something to boot from.
DEL to get into the BIOS. F11 to select the boot device.
From a functional point of view this had a very similar BIOS to the previous one. It identified itself as
AMI BIOS v02.58
An oddity was that rather than the usual white-on-blue colour scheme this had a black-and-white display.