Here are the most commonly used and even a alternative way to enter BIOS Setup in DOS mode.
Usually it is supplied by the motherboard manufacturer and
is available from their website. Along with the latest
version of the BIOS for the motherboard in a file, usually xxx.BIN although it may be called something else.
However in almost every case they will advise you to boot into DOS and run their loader program to flash/update the BIOS.
One way to do it:
•Copy their loader and BIOS update to a blank floppy.
•Make sure that your BIOS is set to boot from A: first.
•Put in a bootable DOS diskette in Drive A: and boot.
•Swap out the DOS diskette, put in the BIOS update disk
and run the update program.
If you don't have a DOS disk this is how you can make one:
•(More options are available at »www.bootdisk.com
•Download this compressed (zipped) file: MS-DOS 6.22 in executable zipped format
•Put a formatted floppy in the A: drive.
•Decompress/Unzip the contents of the file above file to your floppy
•You now have a bootable DOS diskette.
It's also a good idea to read any instructions on the manufacturers website.
Bart's way to create bootable CD-Roms (for Windows-Dos)
This site also contains information about how to create several other types of bootable CD's, making it a great 'bookmark' addition for any serious 'hands on' computer user.
Press the power button on the front of the case to discharge any remaining charge in the Power Supply.
The green led should be off, if your motherboard has one.
Make sure you ground yourself to the case, or use an anti-static wrist strap, to reduce the static potential.
Look for a jumper near the battery, it will be labelled clrrtc, CMOS, or something similar. Consult your motherboard manual for the specifics on your board.
Some boards do not have a jumper, just two solder points that need to be bridged/shorted.
Most jumpers have three pins, with 2 of them covered. Switch the 'cover' to short the other two pins. (In other words, if Pins 2 and 3 are covered, remove the jumper and cover Pins 1 and 2). Leave the jumper in the 'clear' position for a few seconds.
Put the jumper back to its original position.
Replace power cord and try booting now.
You should (hopefully) see the bios screen, where you can choose the cpu speeds etc. f-10 to save. All BIOS settings have been reset to factory DEFAULTS by using this process!
Providing you can get to a DOS prompt....try holding down the shift key + F5,different combinations for different computers.
Then type the following.
at the command prompt type DEBUG then hit enter
You'll see a dash(-) at the debug prompt.
Now type o 70 2e then hit enter
Then type o 71 ff and hit enter
Then type Q and hit enter.
Reboot..... the bios password should now be gone.
NOTE: This works only with MS-DOS 6.00, ^.22 and MS-DOS 7.xx (aka Windows 9x)