New Macs backwards compatible with Leopard 10.5 or only SL 10.6???

Discussion in 'iMac' started by California, Oct 21, 2009.

  1. California macrumors 68040

    California

    Joined:
    Aug 21, 2004
    #1
    Guys, do you think the new iMacs/mac Minis/macbooks will be backwards compatible with 10.5 Leopard or only Snow Leopard compatible...

    ... since they will undoubtedly ship with Snow Leopard 10.6 only?
     
  2. robbieduncan Moderator emeritus

    robbieduncan

    Joined:
    Jul 24, 2002
    Location:
    London
    #2
    Snow Leopard only, at least officially. If absolutely identical hardware shipped with a Leopard machine then Leopard might boot on it, but the again it might not due to differing minor hardware/platform driver requirements.
     
  3. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #3
    The Mac mini should be 100% compatible with Leopard. There's no new hardware in it at all.

    The low end 9400M G 21.5" iMac should be Leopard compatible. The jury is out on HD 4670 support for the Core 2 Duo 27" model. The 4850 support was there in the last revision.

    Keep in mind you're going to need to clone or image from Leopard. Installer discs unless modified are probably going to choke on the machine ID.
     
  4. eawmp1 macrumors 601

    eawmp1

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    Location:
    FL
    #4
    2+
    But why look back?
     
  5. California thread starter macrumors 68040

    California

    Joined:
    Aug 21, 2004
    #5
    Interesting.

    Can someone boot a Snow Leopard only Mac off a PPC Mac on Leopard?

    I'm asking because right now I can target disc boot my 1.5ghz Powerbook G4 on Leopard through my 2.26ghz Mac Mini

    purchased with 10.5 OEM OS in mid August

    that is running Snow Leopard now but that was an upgrade from its original Leopard operating system...

    I'll bet that I could not target disc boot a PPC Mac on Leopard to a new Mac that ships with Snow Leopard only....
     
  6. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #6
    The only issue would be the partition scheme. Otherwise 10.5.8 is going to support the hardware that 10.5.8 supported. (Core 2, 9400M G, HD 4850)

    Leopard will work on both PowerPC and Intel Macs since it sports both binaries. I've imaged both architectures from a single image source.
     
  7. California thread starter macrumors 68040

    California

    Joined:
    Aug 21, 2004
    #7
    Thanks E,

    but betchbygollywow that I won't be able to start up a Snow Leopard-only Mac with a PPC Mac 10.5 hard drive through target disc mode.
     
  8. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #8
    As I said before 10.5.8 should just find the hardware it supports and boot it.

    The only concern I'd have is Apple Parition Map (PowerPC) vs. GUID Partition Table (Intel).

    I happen to know a few things about antics like this. :p

    http://guides.macrumors.com/Tiger_on_Mac_Pro_(Early_2008)
     
  9. California thread starter macrumors 68040

    California

    Joined:
    Aug 21, 2004
    #9
    Dear E:

    Yes, you do know a few things about it... very interesting info.

    So, if I bought, say, a 2.53ghz 13" macbookpro today, that ships with SL installed, I could backtrack it to 10.5?
     
  10. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #10
    Yes, you can install 10.5 Leopard on that hardware.

    You'd have to clone or image though unless you happen to have the original Leopard discs for that model.
     
  11. pwatson80 macrumors newbie

    Joined:
    Oct 27, 2009
    Location:
    UK
    #11
    I've done exactly that, we have some issue with various software on 10.6. Not to mention postscript printer drivers!!!

    I found that the new 21.5" iMacs won't even boot from a retail 10.5 disc

    I installed a base installation on a separate partition, the used CCC to create a bootable image.

    Then booted from the 10.6 disc, used disk utility to restore the image on to the new iMac.

    As mentioned earlier in the thread the Airport card will not (function not an issue for me personally). Also noticed you cannot adjust the brightness either! So buy some sun glasses!!

    You occaisionally get the grey reboot screen when starting the machine up.

    I've yet to put it through its paces, just wondering whether its possible to extract the drivers for the display and airport from the disc?
     
  12. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #12
    If you are running 10.5.x on your iMac 21.5" which version is it?
     
  13. pwatson80 macrumors newbie

    Joined:
    Oct 27, 2009
    Location:
    UK
    #13
    I take you mean OS version? we're running 10.5.8 on three new 21.5" 3.06GHz iMacs
     
  14. pwatson80 macrumors newbie

    Joined:
    Oct 27, 2009
    Location:
    UK
    #14
    Managed to find a work-round for the brightness issue, theres a nice little app called Screen Shades (freebie) which helps prevent your retinas from exploding! Simply add it to your prefpanes and away you go. :cool:
     
  15. Eidorian macrumors Penryn

    Eidorian

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    Mar 23, 2005
    Location:
    Indianapolis
    #15
    Thanks for all the work and research pwatson80.
     
  16. 300D macrumors 65816

    300D

    Joined:
    May 2, 2009
    Location:
    Tulsa
    #16
    Macs can only run the OS they were released with or newer.
     
  17. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #17
    This isn't true every time.
     
  18. tanousjm macrumors member

    Joined:
    Jul 5, 2009
    #18
    I can also confirm Leopard compatibility on the new (October 2009) Mac Mini (2.66GHz). Using a retail 10.5.6 install disc, I booted from the disc, erased the drive with Disk Utility, and installed. Now updated to 10.5.8 and everything works fine.
     
  19. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #19
    Looks like the "new" minis are just the "old" 9400M G ones with faster processors dropped in. I love this kind of exploration of Apple's hardware but I don't have the money to do the testing. Thanks everyone! :D
     
  20. California thread starter macrumors 68040

    California

    Joined:
    Aug 21, 2004
    #20
    Right back into this thread.

    My parents got a refurb 2.26ghz mac mini, just like mine, but theirs is Snow Leopard.

    Mine was purchased in the Summer and came with 10.5.6 Leopard install discs.

    if I erase their new hard drive, can I boot with my Mac Mini Leopard discs?

    I need to do this because they are upgrading from a PPC G5 and will need to transfer the Rosetta stuff for their Word apps and other things.

    As I understand it, Snow Leopard does not support Rosetta.

    Do you guys think I will be able to boot their mini off my mini OEM OS discs?

    (After I erase their hard drive? Their mini is brand new and never been used yet.
     
  21. Eidorian macrumors Penryn

    Eidorian

    Joined:
    Mar 23, 2005
    Location:
    Indianapolis
    #21
    Nothing changed in the Mac minis to require Snow Leopard.
     

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