mkdir ~/boot cd ~/boot
Grab a copy of win98seboot.img
Create a blank 2.88MB floppy image and format as FAT12
dd if=/dev/zero of=floppy.img bs=1024 count=2880 mkdosfs -vvv floppy.img
Launch dosbox
dosbox
Within dosbox, mount the directory containing the images, and issue a boot command.
mount c ~/boot c: boot win98s~1.img floppy.img
After win98seboot boots, you will be dropped to a prompt. Copy the system over to the B: disk
sys b:
All done!