7 Replies Latest reply: Nov 26, 2012 11:09 AM by Allan Jones
elih Level 1 (0 points)

I want to move an OS 9 HD (with system folder to a G4 MDD (titanium) and boot from the OS 9 HD. When I do this I get the blinking "?" inside of a disk. The OS 9 HD boots just fine from the G3 tower (this is the original HD used in the G3). My ultimate goal is to have both an OS X and an OS 9 HD in the G4 and pick the drive on startup from which to boot, but first I need to find out how to get the OS 9 HD to boot.




PowerMac, Mac OS X (10.5.8), Duel Processor
  • Texas Mac Man Level 8 (46,565 points)

    What G4 MDD model (MHz) do you have? (Titanium is not a G4 desktop model) The MDDs can only boot to a special version of OS 9.2.2 that is included on the system install disc that came with the Mac. You should be able to run in classic mode using the G3 HD.


     Cheers, Tom


    Noticed in your profile that you are running Leopard OS 10.5. Leopard doesn't support classic mode.


    Message was edited by: Texas Mac Man

  • elih Level 1 (0 points)

    I'm not sure why I thought it was a Titanium model. It is a PowerMac G4 MDD model 8570. I know that Leopard doesn't support classic mode, but I'm trying to bypass that by adding a separate HD that boots OS 9. Unpon startup, I would select the appropriate drive (OS X or OS 9).


    When I install the OS 9 HD in the G4 and boot from Leopard, the OS 9 drive shows up on the desktop and is accessible. I want to be ableto boot from the OS 9 drive, also.


    So, if I use the reinstall OS 9 using the install disk that came with the G4 (I think I still have that), I should be able to boot from the OS 9 HD. Is that right? If I do I guess that is no turning back to the G3?


    (My G3 is currently running OS 9. I'm trying to reduce the number of computers on my desk by combining the G3 and the G4. My main desktop is an iMac running Mountain Lion. Too many computers and monitors!)



  • Allan Jones Level 7 (33,972 points)

    Only certain MDDs can boot OS9 regardless of what version of OS9 you have. The last dual-boot MDDs were the 1.25G single-processors made and sold in 2004 after the G5s came out.


    I have one of those dual-booters--if you post the "Hardware Overview" results from System Profiler for your MDD (less serial number) I can compare the ROM versions to see if there is a clue therein.


    I know the dual 1.25s and 1.42s cannot boot OS9. My 1.25 SP has two hard drives, three volumes. I can boot 10.5.8, 10.4.11, or 9.2.2.


    Another thing I found out when upgrading the hard drives in my MDD is that OS 9 cannot boot from a partition larger that about 195GB. I tried making a 250GB drive the OS9 volume and 9 would not boot until I partitioned to get one volume under 196GB

  • Glen Doggett Level 4 (1,840 points)

    elih wrote:

    ...Too many computers and monitors!...

    KVM switch?

    Chicken of the VNC?

    One ring [keyboard&monitor] to rule them all!


    You might need a newer or complete version of OS 9 for the G4 MDD than the one that was previously installed on the G3.  OS 9 installer may install only certain extensions that are determined at the time based on hardware found present, which would have been specific to the G3. 


    My MDD did not come with a bootable OS 9 installer, it did come with a 10.2 OS X application, /Applications/Utilities/Software Restore, that you can only run when booted into 10.2, this will prompt you to re-install OS 9 and insert each of the software restore CDs in turn to get the OS 9 System Folder that will boot the G4. 


    I am not sure if you can use a System Folder from one that was installed into a G3 originally.  Also, OS 9 must be on a partition (logical Volume) smaller than 200GB to boot, but parition size doesn't matter for Classic emulation when booted into OS X.

  • elih Level 1 (0 points)

    Allan Jones wrote:


    the "Hardware Overview" results

    Hardware Overview:


      Model Name:          Power Mac G4

      Model Identifier:          PowerMac3,6

      Processor Name:          PowerPC G4  (2.1)

      Processor Speed:          1 GHz

      Number Of CPUs:          2

      L2 Cache (per CPU):          256 KB

      L3 Cache (per CPU):          1 MB

      Memory:          1 GB

      Bus Speed:          167 MHz

      Boot ROM Version:          4.4.8f2


      Hardware UUID:          00000000-0000-1000-8000-000393BBFF30

  • elih Level 1 (0 points)

    I found an install CD for OS 9.2.1, and I successfully booted that CD on the G4. So it looks like my G4 can run OS 9. Now to get the G3 HD configured with version of OS 9 on the CD. Since that HD is, at this time, not installed in any computer, I'm not sure if that has 9.2.1 or 9.2.2 on it.

  • Allan Jones Level 7 (33,972 points)

    Glad it's sorted.


      Boot ROM Version:          4.4.8f2


    That's the same Boot ROM version as my dual-boot 1,25 SP MDD. I suspect the 1Ghz processor is what bailed you out--it's the later machines that either cannot dual-boot under any contition or, like my late 1.25G, require a special version of OS9 available only on the original gray disks.


    I think you'll find you have one screaming-fast OS9 machine. Mine, with lots of RAM and a video card contemporary with OS9, flies!