Mac OS X 10.5 Leopard, released on October 26, 2007, was the biggest change to Mac OS X since Apple first released OS X 10.0 in March 2001. For the first time, a version of OS X was certified as Unix, and the new unified appearance makes Leopard friendlier and less confusing for users.
Leopard itself was also a unified operating system. Where Mac OS X 10.4 Tiger had come in separate versions for PowerPC and Intel Macs, the Leopard installer could run on both platforms, and the version of Mac OS X installed could boot either type of hardware. New features included Time Machine automated backup, Stacks, and Cover Flow.
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- Mac OS X Leopard 10.5 Download ISO. Mac OS X Leopard 10.5 is one of the legendary operating systems developed by Apple. Numbers of distinctive features, classy interface, stable and fast performance are some of the outlines of the operating system. Here click on the links and Download Mac OS X Leopard 10.5 ISO for free.
- Mac OS X Leopard Install DVD Version 10.5 (2Z691 6037 A) (Apple, Inc.)(2007).
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But with every big step forward in features and performance, the Mac OS leaves some older Macs behind. The number of Macs that had been supported by Tiger and left behind by Leoaprd was the biggest for any release of OS X to date: No G3 models were supported, and the installer would not run G4 Macs slower than 867 MHz, although a few workarounds were discovered to address that.
Leopard is immune to the “goto fail” bug identified in early 2014.
After 22 months as the current version of OS X (only Tiger lasted longer, at 30 months), Leopard was succeeded by 10.6 Snow Leopard on August 28, 2009, the first version of OS X to leave all PowerPC Macs behind.
- Leopard Forum, our online group for OS X 10.5 users.
- Leopard List, our email group for Mac OS X 10.5 users.
- Unsupported Leopard Installation, 2007.10.31. How to install Mac OS X 10.5 on unsupported hardware – plus field reports.
- Faking Out the Leopard Installer with Open Firmware, Dylan McDermond, 2007.12.06. You don’t have to hack the installer to make the Mac OS X 10.5 installer run on sub-867 MHz G4 Macs by using this simple Open Firmware trick.
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Last Compatible Software
These are the last versions of software compatible with OS X 10.5 Leopard.
From Apple
From Other Vendors
- Adobe Flash Player
- PowerPC: 10.1.102.64
- Intel: 10.3.183.1
Leopard Links
- Why Spaces Is My Favorite Leopard (and Snow Leopard) Feature, Charles W Moore, Miscellaneous Ramblings, 2009.11.23. Spaces, a feature introduced with OS X 10.5, is like having several monitors on your Mac without the cost and space of using multiple displays.
- The Leopard Experience at 867 MHz, Simon Royal, Tech Spectrum, 2008.12.02. Mac OS X 10.5 requires an 867 MHz G4 with 512 MB of memory, but is performance really acceptable on a minimum spec system?
- Does Constant Time Machine Activity Compromise Disk Longevity?, Charles W Moore, Miscellaneous Ramblings, 2008.09.15. Time Machine is a marquee feature of Mac OS X 10.5, but isn’t all of that disk activity likely to wear our your drive prematurely?
- SheepShaver Brings Classic Mac OS to Intel Macs and Leopard, Alan Zisman, Mac2Windows, 2008.05.20. Mac OS X 10.5 doesn’t support Classic Mode. Neither does Leopard. But SheepShaver lets you emulate a PowerPC Mac and run the Classic Mac OS.
- Restoring a Crashed Mac with an Install Disc and Time Machine, Alan Zisman, Zis Mac, 2008.02.06. Thanks to Leopard’s Time Machine backup feature, it’s easy to restore your Mac to an earlier setup if you’ve inadvertently deleted essential files.
- Leopard different, a bit buggy, but worth the upgrade, Adam Robert Guha, Apple Archive, 2007.11.02. Leopard on a Power Mac G4 and a MacBook Pro: It runs well on both computers, but each has some odd bugs, and some of the changes are a step backwards.
Downloadable Updates
Standalone Updates let you update to a newer version of Mac OS X from your hard drive instead of using Software Update, which requires an Internet connection. Download the one(s) you need and install them after mounting the disk image and launching the Installer program.
There are two types of Standalone Updates: Individual (or Delta) and Combo.
- Individual Updates update one version of Mac OS X to the next version. For example, the Mac OS X 10.5.4 Update updates Mac OS X 10.5.3 to version 10.5.4. Individual Updates are also known as Delta Updates.
- Combo Updates update the base version of a Mac OS X release to the version specified in the Combo Update, including all intermediate updates. For example, the Mac OS X 10.5.4 Combo Update updates any earlier version of Mac OS X 10.5 to Mac OS X 10.5.4 using a single installer, as opposed to installing the individual Mac OS X 10.5.1, 10.5.2, 10.5.3, and 10.5.4 updates.
Standalone Updates are generally available 24 to 48 hours after the Update is available through Software Update.
If you burn a Standalone Update to CD, its disk image must be copied to your desktop or another location on your Mac OS X startup disk in order to be installed.
This page will be updated as new Standalone Updates become available.
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I have found that, by far, the easiest way to install Leopard on unsupported G4s is to spoof the clock speed in Open Firmware before installing. Spoofing will have Open Firmware tell OS X that your G4 is up-to-speed until you reboot. This will allow you to install without hacking an install disc or working in Target Disk Mode. You will still need to meet the 512 MB of RAM requirement, but I wouldn’t suggest using less anyway.
Without further delay, here are some instructions I have passed on to a few friends already:
Editor’s note: Every Mac and Macintosh clone with PCI architecture supports Open Firmware, so this technique should work with any Mac that could possibly run Leopard. It completely eliminates the need to hack the installer on the Mac OS X 10.5 Leopard installer DVD. Be sure your firmware is up-to-date before attempting to install Leopard. (We have a field report indicating that this hack does not work with the 667 MHz and 800 MHz DVI G4 PowerBooks – on those models, you may need to reset min-cpu-frequency and max-cpu-frequency as well.)
Note that some third-party additions to the System can prevent Leopard from booting – Unsanity’s Application Enhancer (APE) tops the list of add-ons – so you should make sure all of your software is up-to-date and may want to (or need to) disable System add-ons before installing Leopard. dk
To install Leopard on an “unsupported” G4 clocked under 867 MHz:
1. Reboot your Mac and hold down the Cmd-Opt-O-F keys until you get a white screen with black text. This is the Open Firmware prompt.
2. Insert the Mac OS X Leopard Install DVD.
3. Type the following lines exactly as shown below into the Open Firmware prompt. Be mindful of capitalization, spaces, zeros, etc. If the command is properly typed and understood, Open Firmware will display “ok” at the end of each line after you hit “return”. What these lines do is set the CPU speed reported by Open Firmware to OS X as an 867 MHz G4 processor system. They then continue the boot from the DVD drive.
For single CPUs, use the following three lines:
For dual CPUs, use the following five lines:
4. Continue the install normally.
5. This CPU setting is only in effect until the Mac reboots. Once OS X Leopard is installed and your Mac has rebooted, the proper CPU speed should once again be displayed when you select About This Mac under the Apple menu.
This article was written by Dylan McDermond and first published on 2007.12.06. It was updated 2007.12.24.
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UPDATE: The folks at iCode have taken the information from this article and used it to create LeopardAssist, a free program that automates this process and eliminates the need to fiddle with OpenFirware on your own.
Editor’s note: Some readers have noted problems booting the Leopard install disc using the above commands. If so, substitute “mac-boot” (without the quote marks) for the last line in the above Open Firmware commands. Also, if your Mac locks up hard during this process, resetting the PRAM (start your Mac and immediately hold down Cmd-Opt-P-R until your Mac restarts) should bring it back to life. dk
Further Reading
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- Using Open Firmware to Install Leopard below 867 MHz, The Mac Elite. Includes info on writing Open Firmware commands to a text file so you don’t have to type them in.
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