Int 15 Fn DB04  U - Ami Bios - Flash Rom - Get Bios Revision               [b]

   AX = DB04h

Return: CF clear if supported
       BL:BH:DL:DH = BIOS revision string
       (e.g. 'AX1 ' for v1.00.05.AX1, 'AV0M' for v1.00.03.AV0M)
       CL = flag: DH valid?
       00h ignore DH; ignore DL as well if 20h (space)
       01h ignore DH if 20h (space)
       CH = BIOS status
       00h normal mode
       01h ROM recovery mode
       AL = ??? (02h)

Note:  used by FMUP.EXE, Intel's Flash Memory Update utility

See Also: AX=DA05h,AX=DA15h,AX=DA8Ch,AX=DB00h,AX=DB03h