I created a custom boot floppy by modifying (+ adding and deleting a few files) the standard Win98 boot disk. It contains a variety of files including msdos.sys, io.sys, command.com, config.sys and autoexec.bat
I modified config.sys, autoexec.bat and help.txt to suit my needs. When I changed my boot sequence to Legacy floppy, the floppy succesfully registered and displayed:
Starting Windows 98.... <-- THIS
Windows 98 Startup Disk <-- AND THIS
1. Use Custom boot disk // MODIFIED
2. View Help file // MODIFIED
As you can see, I managed to modify the lines marked 'MODIFIED' but wasn't able to modify the lines marked 'THIS'
I figured out that these two lines of text are controlled by io.sys by method of elimination. So I opened io.sys in an ASCII text editor (notepad). Half of it was in the form of junk characters so I figured out I couldn't modify it that way. Is there any other way to modify it?
Thanking you for your time,