BIOS File Name:

2GUxxxx: S2DGRU/S2DGE
2GRxxxx: S2DGR

DGHxxxx: P6DGH
DGUxxxx: P6DGU/P6DBU
DGSxxxx: P6DGS/P6DBS
DGExxxx: P6DGE/P6DBE(PCB rev2.xx)

DBUxxxx: P6DGU/P6DBU
DBSxxxx: P6DGS/P6DBS/P6DBE(PCB rev1.xx/0.xx)/P6SBS(PCB rev1.xx/0.xx)
DBExxxx: P6DGE/P6DBE(PCB rev2.xx)

SBUxxxx: P6SBU
SBSxxxx: P6SBS(PCB rev2.xx)
SBAxxxx: P6SBA
SBMxxxx: P6SBM

3BAxxxx: 370SBA

Example:
SBA1191.ROM: BIOS file for SUPER P6SBA USA made boards, modified on 01/19/99
SBA1192.ROM: BIOS file for SUPER P6SBA OEM made boards, modified on 01/19/99