not sure if it works on USB keychains, but GAG is a great tool for 
booting multiple OS's:
http://gag.sourceforge.net/

Brian wrote:
> I'm trying to boot multiple OS's from my USB keychain using syslinux.  So
> far it's working well, I have DOS and Flonix running nicely.
> 
> I want to add more, and here's where it gets tricky.  I want to add some
> single floppy boot disks, and I'm not sure how to go about this.  I'd like
> to keep my root directory as clean as possible, with just the 512 byte .bs
> images and syslinux files.  Something like:
> 
> (root) - just the boot sectors and syslinux files
>  |
>  |------ DOS (the DOS boot disk)
>  |
>  |------ Debian (install floppies)
>  |
>  |------ FreeBSD (install floppies)
>  |
>  |------ Flonix
> 
> Anyway, you get the idea.  I can't figure out any syslinux commands to
> boot a .bs image then immidately vhange to another directory to continue
> booting.  Has anyone done this?  Any tips?
> 
> -Brian
> 
> _______________________________________________
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-- 
scot

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