I spend my days supporting an extended network of over 350 machines. When I had an upstanding user forward me this information, I almost took a load in my pants. I lock my BIOS’s to ensure no one can tamper with information on my machines. I use it to make sure unauthorized individuals can’t start my machines up.
This makes it all useless.
A simple DOS trick resets (deletes) your motherboard BIOS (CMOS) password, to grant access to your computer and/or BIOS Setup. In Windows 9x you can drop to dos, boot from a win9x floppy or reboot to the native MS-DOS mode, using the “Command prompt only” option from the Windows 95/98 Startup Menu (hold Shift and F5 at the same time while your PC boots).
Switch to the C:\windows\command directory and type:
and hit Enter. You’ll see a dash (-) at the DEBUG prompt. Now type:
o 70 2e
which will show as -o 70 2e at the DEBUG prompt. Hit Enter. Then type:
o 71 ff
and hit Enter. Finally type:
and hit Enter one last time, to quit DEBUG, back to the C:\> prompt.
Now you’re ready to reboot your PC, and press the appropriate key or key combo (look it up in your motherboard manual if you don’t know it) to access your BIOS Setup. You’ll notice that the password is gone.
NOTE: This works only with the following MS-DOS versions: MS-DOS 6.00 – 6.22 and MS-DOS 7.xx (MS Windows 9x)
To stop it you’ll need to delete Debug.exe from your installation. Use a program like DeepFreeze to lock out key combinations during boot, and ensure that C: is your default first boot device.