I am trying to develop an installer package for a specialized
application that runs on MS-DOS (Actually Windows 95 without the GUI).
To this end, I am using a machine that has been preloaded with Ubuntu
Linux 10.04 (uses grub 2). This machine has both a floppy and a CDROM.
When booted with a special MS-DOS floppy and a special CDROM in the
drive, it copies the system from the floppy drive (A:) to drive (C:).
"Drive C:" is a partition of the only hard drive on the system -
/dev/sda3 in linux terms. This partition was carved out by GParted
and formatted using DOS Format command from the system booted from the
floppy in drive A:
The test of all this, is that when the floppy is not present in the
drive and the system is booted, MSDOS should boot from "Drive C:"
Of course, since this is a dual boot system, this must be reflected in
GRUB. I have created the following file: /etc/grub.d//11_msdos. Its
contents are as follows:
#!/bin/sh -e
echo "Adding MS-DOS"
cat << EOF
menuentry "MS-DOS" {
set root=(hd0,3)
makeactive
chainloader +1
}
EOF
I run update-grub and this gets written into /boot/grub/grub.cfg.
When I reboot the machine (floppy drive not loaded, of course) the grub
menu appears. But when I select MS-DOS, I see the
"Invalid System Disk" error and the system won't load.
Can someone help me understand why not?
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