I've searched around, and I can't find anyone attempting just a flat dual boot between the two. Technically, I'm trying to have MS-DOS, vista, and ubuntu living happily together. I installed DOS to the first partition, windows second, to the third partition, and ubuntu third to the second partition. When I start my system, I get the grub menu, but only ubuntu and vista are listed. How would I go about adding MS-DOS 6.0 to the list?

(If your asking the use of dos, I have some old games, and I'd like to install 3.1 to it, and not be running in an emulator)

Thanks
-Spence

Frankly, I'm not sure you *can* do it: I think DOS might actually be too primitive to allow it.

TWO SUGGESTIONS:
* See if "Grub for DOS" might be a viable solution:
http://freshmeat.net/projects/grub4dos/

* Put DOS on a bootable device (3.5" floppy, CD-ROM or USB stick) and boot from the device (instead of from Grub).

'Hope that helps .. PSM

I can try it, but I'm not following on how to use this.

1. There's information about "grub4dos" on several sites. Just Google for it, if the link I gave you isn't working for you.

2. In any case, my MAIN suggestion remains:
Try putting DOS on a floppy (or CD-ROM, or even a USB stick) and see what happens. I use a version of DOS, ROM-DOS, that boots just fine off of USB.

Yes - it can be done.

general you install Dos6 to a 1-2 Gb partition ( dos is fat16 & can't go larger than 2GB)
then the windows to the 2nd partition & use the windows boot menu to access the dos6 O/S
Finally install the linux O/S to the 3rd & probably last / closest to the end of the hdd.

the Linux boot menu is used to switch between Linux & Windows.

Note that it is also possible to have the dos6 entry in this boot list, by editing the boot file.
( Grub.cfg ) if a latest Linux O/S.

the entry would be quite similar to the one used to boot the windows partition.

EDIT : another option would be to use virtual box under the Linux O/S.