Hi Ringo,
I don't know about version 3.5 for the EIIIX, but the latest version is 2.10.
The image for a bootable EIIIX OS 2.10 disk can be downloaded here:
http://users.skynet.be/emxp/EIIIXOS210.imgTo save this image to a 3.5" 720K floppy disk, you can use OmniFlop for Windows XP:
http://www.shlock.co.uk/Utils/OmniFlop201n.zipFollow the installation instructions mentioned on the omniflop website/manual.
In short: (1) install the driver, (2) start omniflop :-)
Then license the driver for use with EMAX (again, see manual) (EMAX formatted disks are compatible with EIII(X) formatted disks...)
Now you're ready to create the EIIIX disk:
(1) Use Omniflop to format the floppy in your XP PC, choose the EMAX 10*512 layout !
(2) Copy the EIIIXOS210.img file to the floppy with Omniflop (Write-button)
Success !