i see, thank you for all these information, it was really very instructive. i have a question, is there any way to inject a rom file made from a real machine into VMware to do a simple test ? i suppose it's not possible since VMWare uses specific chipset 440BX which can only be emulated with "bios440.rom" file. Do you confirm ?
Yes I confirm. BIOS means BasicInputOutputSystem. It's a specific (operating) system made to initialize the specific hardware and therefore unique. A VM BIOS initializes virtual hardware specifically made to run a VM. Besides of that there are different BIOS vendors with completely different module structures. (AMI, Award, Phoenix...Insyde, Aptio, etc...etc..) The successor of BIOS, (U)EFI has got a more unified structure. It is possible to cross-flash different BIOSes on other mainboards, but only if the mainboards are very similar. But doing this might lead to issues anyway and it's not advisable.
Would manual mod also work on Phoenix-bios-types? I want to try to add a MSDM-table to a already SLIC'd rom. For example: When opening a rom with PhoenixTool, shown status: "Phoenix BIOS (New style)", its being decompressed(?), but in DUMP-folder i can't find any file, which is similar/contains XSDT or RSDT like in the example of the ASUS P5Q-bios, which was written by @Yen (btw, very good posting). So i guess the part is still decrypted or compressed?