what on earth are you talking about "update the bootsector of the floppy"
did you read what the man posted?
actually he doesn't need a Win 98 startup floppy to update mobo bios. You only need awardflash.exe, the update .bin file, command.com, and the two registry files, IO.sys and msdos.sys - and autoexec.bat if you want it to autostart. Once again, in this more focused case, just make a file in the root directory with these files and paste in whatever bin file you need. That way you wont "have to look for a Win 98 machine" all the time.