If you're simply looking to get DOS on there, there's a freeware os called MOE-DOS (http://www.moedos.net) that's small and would get it bootable, and there's also FreeDOS at http://www.freedos.org/ which is in beta but is more compatible with later MS-DOS.
Depends on what exactly you're attempting to accomplish with it. Don't know if you'd want an actual sandisk image to accomplish it, might be easier to simply do a wipe and quick install.
Curious, browse over to http://www.bootdisk.com/ who has boot disk images for quite a few operating systems. Personally, I'm running DR-DOS 7.03 on my i-o (from the hard disk, though). There is an excellent support page on DR-DOS at http://www.drdos.org
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