Editing a Acer M29A bios

[GL1zdA]

I've recently got an old SGI Visual Workstation 550 PC. It's a standard PC based on Acer's M29A motherboard which uses the Intel 840 chipset with Pentium III Xeons. Unfortunately it only offers very basic settings and none of them are performance related (can't change FSB, memory timings etc.). I tried opening the BIOS with any of the standard utilities - Award BIOS editor, Phoenix BIOS editor and AMIBCP, but none of them recognize this BIOS. The SETUP program itself doesn't give any hints what type of BIOS it is. Can anyone check the file and tell me what should I use to edit? I've uploaded the file here: https://www.dropbox.com/s/sn86o1eytfxbh9...s.zip?dl=0 .