Okay, let's see if anybody can help me here. I'll try to be detailed about the issue I'm having. I have redhat 9 installed on my machine, but I just recently bought a nice large hard drive, and I want to give gentoo a spin on it. I added this hard drive to the machine, and went through the installation (we won't discuss the time it took).

Anyway, my new harddrive is ATA 100, so I had to reconfigure the boot order in my BIOS. I'm using grub .94 on my new gentoo hard drive, and I was hoping to add redhat as an option in my new drive's grub.conf. Here is what the original grub file had.

default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Linux (2.4.20-8)
root (hd0,0)
kernel /vmlinuz-2.4.20-8 ro root=LABEL=/ hda=ide-scsi
initrd /initrd-2.4.20-8.img

But as I said, I changed the boot order in my BIOS, so this would now be hard drive would be hd1, correct? Beause it's not booting right to the redhat hard drive. I added this into my Gentoo drive grub.conf

#See if RedHat can also be booted
title Red Hat Linux (2.4.20-8)
root (hd1,0)
# kernel /vmlinuz-2.4.20-8 ro root=LABEL=/ hda=ide-scsi
# initrd /initrd-2.4.20-8.img
kernel /vmlinuz-2.4.20-8 ro root=/dev/hdc1
initrd /initrd-2.4.20-8.img
chainloader +1

I commented out the old information for reference. Well, needless to say, when I try to boot into redhat, grub crashes complaining about some unrecognized command. I've been editing this file in all kinds of different ways through grub, but I just can't seem to get it to work. One of the main questions I have, is this LABEL=/hda=ide-scsi. I'm not sure what to do here, because my gentoo installation mounts the redhat drive as /dev/hdc2 which is the redhat root directory. /dev/hdc1 is the old redhat 9 boot partition. Please help, because I'd love to keep redhat running on this machine as well.

So have you tried

title Red Hat 9
root (hd1,1)
kernel /boot/vmlinuz-2.4.20-8 root=/dev/hdc2

I would say the problem started when you changed the BIOS...........
change the BIOS back to what it was before you install gentoo.......and
see if the system boot and too which OS it boots to.........

No dice, I've tried changing the bios back, and that won't work either. I'm not quite sure where that problem comes from.

I also tried those commands in grub.conf, but it's still complaining about an unrecognized command. It looks like it finds the files, but can't seem to execute the code.

What file system is Red Hat on? Ext3? Do you have an e2fs_stage1_5 file in /boot/grub on Gentoo, alongside your menu.lst?

it's ext3, and yes I have that file in there... Hmmm