How can I access MS DOS from win XP?
I want to upgrade my BIOS. (Downgrade, in fact.)
You can make a DOS boot floppy from Windows XP, but it might not be able to access your hard disk, so that's no good if your BIOS image doesn't fit on a floppy.
The standard tool for BIOS upgrades (or downgrades, it's the same thing anyway) is FreeDOS. This is a free DOS clone, with enough basic support for modern hardware to get going. See for example Creating FreeDOS USB boot stick for BIOS flashing.
1.Open the "Start" menu from the taskbar. 2.Click "All Programs," then click the "Accessories". 3.Click "Command Prompt" to open the "Command Prompt" window. This is where MS-DOS commands can be entered and executed. 4.To access a list of commands, type "help" at the prompt and press "Enter." To learn how to use a specific command, type "help " and press enter.
Start -> Programs-> Accessories->command prompt
Start->Run->Type Command and Press Enter