Robin Hoods Playground

What is the dos command prompt for producing sound at a certain frequency? I used to know this well. There is a dos command that you type followed by or preceeded by a number such as 19550 which is a specific frequency the computer would then produce. I'd like help with the actual command and the sy...

How do you start a computer in DOS? My computer got a virus and it won't start up anymore at all. It just comes up with the compaq (computer brand) screen and then just black. So I thought that if I could start it in DOS, then I could format C: and then reinstall Windows. Can anyone help me? _______...