There are times when you need to boot a system from something other than the hard drive. Those times are usually described as bad, disasterous or catastrohpic crapout. In any event, you need a floppy disk with a bootable image on it. One of the best and easiest to use is tomsrtbt (tom's root boot), which can be found a number of places, including:
Depending on how you want to create your disk (Windows or Linux) pick the dos.zip or tar.gz version respectively, and then follow the instructions. For Windows/DOS, you will need rawrite to create the floppy, which is on your RedHat CD under dosutils. Also, you will need to boot into DOS, it won't work under Windows.
For the Linux version, after you download tomsrtbt.tar.gz, you unpack with (assuming version 1.7.361):
Go to the tomsrtbt-1.7.361 directory and enter install.s. It will ask for a floppy, format it and then install the disk image. You may have a problem with the format with newer floppy disks. If you get an error and it tried to format 82 tracks, do the following: