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Mac OS X Snow Leopard Developer Preview Seeds were released between June 2008 and early 2009.
In March 2020, with only minor modifications, builds 10A096 and 10A190 were found to install successfully on certain PowerPC machines (G4/G5). Apple stated officially that PowerPC macs would not be supported, once Snow Leopard was released for retail sale, making these early Developer Previews of particular interest to the Apple PowerPC enthusiast community.
A highly motivated community on MacRumors have been thoroughly testing the PowerPC compatible Snow Leopard builds, since April 2020. Community efforts to compile Apple Open Source Projects, fix bugs and backport system components are ongoing. Several usability fixes and installation instructions are detailed in a robust WikiPost: Here
DP_10A96_Server.iso (7276.31 MiB / 7629.77 MB)
10A096 Server Developer Preview Seed / ISO image
Apple_Mac_OS_X_10.6_10A96_Client.cdr (7281.44 MiB / 7635.14 MB)
10A96 Client Developer Preview Seed / CDR image
10.6_snowleopard_10a190_clientdvd.iso (7533.72 MiB / 7899.68 MB)
10A190 Client Developer Preview Seed / ISO image
Kernel_Debug_Kit_10-6_10a190.dmg (155.1 MiB / 162.63 MB)
Kernel Debug Kit Snow Leopard 10A190 / DMG image
10.6_snowleopard_10a222_clientdvd.iso (7152.15 MiB / 7499.58 MB)
10A222 Client Developer Preview Seed / ISO image
kernel_debug_kit_snow_leopard_10a222.dmg.zip (108.04 MiB / 113.29 MB)
Kernel Debug Kit Snow Leopard 10A222 / DMG image, zipped
10.6_OS X_10a354_Client.cdr (6927.34 MiB / 7263.85 MB)
10A354 Client Developer Preview Seed / CDR image
Apple_Mac_OS_X_Server_10.6_10A380.cdr (6617.04 MiB / 6938.47 MB)
10A380 Server Developer Preview Seed / CDR image
Apple_Mac_OS_X_10.6_10A380.cdr (6285.61 MiB / 6590.94 MB)
10A380 Client Developer Preview Seed / CDR image
Mac_OS_X_Snow_Leopard_10.6_10a432.dmg (6281.75 MiB / 6586.89 MB)
10A432 GM Developer Seed / DMG image
kernel_debug_kit_10.6_10a432.dmg.zip (117.27 MiB / 122.96 MB)
Kernel Debug Kit Snow Leopard 10A432 / DMG image, zipped
10.6-developer-preview-seed-notes.pdf (105.1 KiB / 107.62 KB)
10.6 Developer Seed Notes Collated PDF
From Mac OS 10.5
Important: Mac OS X Snow Leopard Developer Preview is prerelease software. Do not use this prerelease software in a commercial operating environment or with important data. You should back up all of your data before installing this software and regularly back up data while using the software.
For more information about the Snow Leopard Developer Preview, see the relevant Snow Leopard seed notes.
Erasing and formatting your disk
You can erase and install Mac OS X on your hard disk using Disk Utility.
NOTICE: If you erase the destination disk, everything on the disk—your user accounts, network settings, and all of your files and folders—will be deleted. Before you erase your disk, quit the Installer and back up any files you want to keep by copying them to another disk.
To open Disk Utility:
to erase, and then click Erase.
2. Choose a disk format. In most cases, you should choose Mac OS Extended (Journaled).
3. Give your disk a name, and then click Erase.
Customizing your installation
If you see a message that you don’t have enough disk space to install Mac OS X, deselect items to be installed, such as printer drivers, to save space.
To customize your installation:
Quitting the Installer
To quit the Installer before the actual installation process begins:
1. Choose Quit Mac OS X Installer from the Mac OS X Installer application menu.
2. Click Startup Disk to select a startup disk for your computer.
Advice about installing
This Snow Leopard Developer Preview is a pre-release build, it is not advisable to use this software on a production system with information on it that you depend on for your business.
Please be aware that you will not be able to revert back to your previous system after updating. Please install this update on a system you are prepared to erase if necessary.
IMPORTANT: Always back-up your system before installing pre-release software seeds.
A. Install Snow Leopard using hard disk partitions:
Three hard disk partitions internal or external (you could use 2 but 3 recommended)
Hard disk partitions setup:
Partition 1 - download Snow Leopard disk image here
Partition 2 - restore disk image onto this partition
Partition 3 - partition to install Snow Leopard on
(Partition 3 is optional, you can install onto Partition 1 if you only have 2 partitions)
1. Boot off partition 1, using Disk Utility, restore the Snow Leopard DVD Disk Image onto partition 2
2. Boot off partition 2 and install Snow Leopard onto partition 3
OR if you only have 2 partitions:
2. Boot off partition 2 and install Snow Leopard onto partition 1
Note: Use System Preferences : Startup Disk to pick startup volume
B. Burn bootable DVD for installation:
1. A DVD drive capable of burning double-layer DVDs
Here's how to check to see if you have such a drive:
- Launch "Systems Profiler"
- Under Hardware, click on "Disc Burning"
- Under "DVD-Write", if "+R DL" is listed then your machine has the ability to burn double layer DVD discs.
2. A blank DVD+R DL media
1. Launch Disk Utility
2. Click the Burn button in the Toolbar
3. Navigate to and select the downloaded DVD disk image then click the Open button
4. Insert a blank DVD+R DL disc into your DVD burner
5. Click the Burn button
After burning, install Snow Leopard from the burned DVD.
- Some machines may panic during the reboot after installation. The install has still suceeded so please reboot again.
- Third-party keyboards are not recommended for use in this seed and may result in an Mac OS X Installer crash.
- After installing on a MacBook Air you will need to restart before you can use AirPort.
Locating the Installer log
When you install Mac"OS"X, the Installer saves a log of the installation. To see the log, open Console (in the Utilities folder in the Applications folder), click Show Log List, click the disclosure triangle next to /var/log, and then select install.log.
The Installer can’t repair your disk
If a message says the Installer can’t repair the disk, you may need to erase it. This deletes all the files on your disk.
NOTICE: If you erase the destination disk, everything on the disk—your user accounts, network settings, and all of your files and folders—will be deleted. Before you erase your disk, quit the Installer and back up any files you want to keep by copying them to another disk. When you’re ready to erase the disk, open the Installer and follow the instructions in “Erasing and formatting your disk”.
The installation wasn’t successful
If you were unable to install Mac OS X, try the following:
After disconnecting unnecessary devices or ejecting any cards, start up from the Mac OS X Install Image. Select your language and click the forward arrow. To open Disk Utility, choose Utilities > Disk Utility. Select the disk on which you want to install, click First Aid, and then click Repair Disk. After repairing any problems, quit Disk Utility and click Continue to try installing again.
If you were still unable to install Mac OS X, try erasing your disk before installing Mac OS X. To erase and install Mac OS X, see the instructions in “Erasing and formatting your disk”.
Mac OS X installation was interrupted and you can’t start up your computer
Restart your computer. Your computer may start up using the last system you were using. If it doesn’t and you have another Mac OS X system installed on your computer, restart your computer while holding down the Option key to select a startup disk.
If your computer doesn’t start up this way, insert the Mac OS X Install Disc in your computer and hold down the C key while restarting. Open Startup Disk preferences and select a startup disk.
Additional information Using Microsoft Exchange
Mail, iCal, and Address Book work with Microsoft Exchange Server 2007 SP1. The Snow Leopard Developer Preview contains read-only access.
To use Address Book with Microsoft Exchange Server 2007 SP1, use Address Book Exchange Preview, which is located in your Applications folder. Address Book Exchange Preview is only for testing Microsoft Exchange Server functionality. For general testing use the standard version of Address Book.
Submitting crash reports
If you would like to disable the automatic report, use the following shell command:
defaults write com.apple.CrashReporter AutoSubmit -bool NO
Emulating this? It should run fine under: QEMU