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Built-in support for Classic is gone in 10.5 and Intel Macs:
Classic, is the ability to use Apple menu -> System Preferences -> Classic to run Mac OS 9 simultaneously with Mac OS X, and access Mac OS 9 applications from Mac OS X without having to go through Apple menu -> System Preferences -> Startup Disk to select Mac OS 9's System Folder. Many drivers that booting into Mac OS 9 are not supported in Classic environment. Multiple disk games frequently require imaging all the discs and mounting first while using Classic, when booting into Mac OS 9 allows hot swapping of the same physical discs. Classic requires there be a Mac OS 9 system folder present with Mac OS 9.1, 9.2.1, or 9.2.2. Macs that date on/later than 9.2.1's August 21, 2001 release must use their original installer disks to install Mac OS 9. Booting into Mac OS 9, only requires the Mac OS 9 that is the same age or newer be installed in the Mac. Macs too old to install Mac OS X, can only install up to 9.1 if they are PowerPC (except the ones that are 53xx/54xx/63xx/64xx and fail its firmware test and those can only install up to System 7.5.5).
Mac OS 9 is not to be confused with Mac OS X 10.9, Mavericks, of the similar name. 13 years separate their release.
A few Macs officially support both booting into 9 and 10.5 without an additional partition or hard drive with booting via Apple menu -> System Preferences -> Startup Disk in 10.5, and Apple menu -> Control Panels -> Startup Disk in 9 or booting holding the X key on a restart from Mac OS 9 boot. They are these models:
PowerMac G4 867 and faster QuickSilver
PowerMac G4 1 through 1.25 Ghz MDD with no Firewire 800 port (see below)*
eMac 1 Ghz model M8950LL/A
Powerbook G4 867 Mhz and greater with rear USB ports between the hinges under a flap.
To get those Macs to support Mac OS 9 booting, an erase (yes that means losing all data presently on that disk) and install requires installing with Mac OS 9 drivers before installing Mac OS X or Mac OS 9, as this article explains:
No iMacs, nor iBooks meet the requirement.
Some CPU upgrade card Macs may support dual booting. Check with the third party manufacturer of the CPU upgrade card if that is possible.
For more on 10.5's offerings, see this tip.
While older Macs may work with Leopard with a special Target Disk Mode based install, this is not an officially recognized configuration, meaning any attempt to do so is on your own, with all the risks of maintaining and upgrading that configuration up to you.
Backup your data at least twice before attempting any upgrades.
It is possible to add an external firewire hard drive, or partition an existing hard drive of a Mac that supported Tiger to have a dual-boot Tiger/Leopard configuration on 867 Mhz G4 and faster PowerPC Macs. Partitioning will wipe the contents of the hard drive, so backup your data at least twice before proceeding. Here's how to partition:
This will also allow using Classic in the Tiger booting session if installed from the Mac's original restore discs:
and/or retail installer for 9 if newer than those discs.
Those discs can typically be obtained by calling AppleCare if you lost them, or asking the original seller of the machine to give you the restore discs. If they lost them, they should call AppleCare on your behalf and give them to you.
AppleCare can be reached here:
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*
The ports on the back of the MDD PowerMac G4 image above show where Firewire 800 is, if it is present. When it is not present in that location, the MDD PowerMac G4 can boot into Mac OS 9, even when Mac OS X 10.5 is installed, via Apple menu -> System Preferences -> Startup Disc. When Firewire 800 is present you must install 10.4.11 or earlier on a second hard drive internally, a partition of the 10.5 or later drive, or an external Firewire hard drive if you wish to use Mac OS 9 in its Classic environment. Booting is not available to Mac OS 9 with Firewire 800 built-in PowerMac G4s. Either way, to get Mac OS 9 on the PowerMac G4 MDD models, you need to use the original PowerMac G4 installer discs that came with it following the restore directions below:
http://support.apple.com/kb/HT1561
Check display support
You can connect one or more external displays depending on your Mac model. To find out how many external displays your Mac supports, check its technical specifications:
- Choose Apple menu > About This Mac.
- Click the Support tab.
- Click Specifications.
- On the webpage that appears, the number of displays your Mac supports appears under Video Support or Graphics.
If you're using a Mac with Apple silicon, you can connect a single external display to your Mac using one of the Thunderbolt / USB 4 ports. Docks don't increase the number of displays you can connect as an extended desktop. On Mac mini (M1, 2020), you can connect a second display to the HDMI port.
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Connect your display
Connect your display to power, then connect your display to your Mac. Check the ports on your Mac to find out whether you need an adapter.
Change display options
After you connect your display, you can choose to extend your desktop or mirror your displays.
Use extended desktop mode
- Choose Apple menu > System Preferences, then click Displays.
- Click the Arrangement tab.
- Make sure that the Mirror Displays checkbox isn’t selected.
- Arrange your displays to match the setup on your desk. To change the position of a display, drag it to the desired position. A red border appears around the display as it's moved.
- To set a different display as the primary display, drag the menu bar to the other display. The primary display is where your desktop icons and app windows first appear.
Mirror your displays
- Make sure that your external display is turned on and connected to your Mac.
- Choose Apple menu > System Preferences, click Displays, then click the Arrangement tab.
- Make sure that the Mirror Displays checkbox is selected.
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Use AirPlay
With Apple TV, you can use your TV as a separate display for your Mac. Learn how to use AirPlay to mirror or extend your Mac display.