This tips is I get from some friend a last years.
Possible this can assist you requiring. Step into DOS mode after emerging DOS prompt of c:\> typing DEBUG like this:
c:\>DEBUG
Henceforth type:
o 70 2eHenceforth type:
o 71 ff
Q
At the monitor screen will seen like here under c:\>DEBUG
-o 70 2e
-o 71 ff
-Q
After typing Q you'd go out from debug designating you have. Here in after restart your computer, depress DEL and CONGRATULATION you have stepped into BIOS.