Symptom
When you try to open a Classic application, an alert box appears as Classic opens with the message:
Figure 1 Starting Classic with Mac OS 9.0.4
You see a similar message when you open the Classic control panel:
Solution
If you install Mac OS X on a computer that has Mac OS 9.0.4 or earlier installed, you will see a warning telling you that you need Mac OS 9.1 to run Classic.
If you have a reason not to update to Mac OS 9.1, you can use Mac OS 9.0.4 and Mac OS X on the same computer. However, you must also install a Mac OS 9.1 System Folder on the computer and designated it as the Classic startup volume. Because this requires having two Mac OS 9.x System Folders, the most manageable setup would include at least two hard disk partitions.
When you try to open a Classic application, an alert box appears as Classic opens with the message:
- "The System file on the selected startup disk is prior to version 9.1 and is not supported by Classic. Please select a different startup disk using the Classic preferences panel and restart Classic"
Figure 1 Starting Classic with Mac OS 9.0.4
You see a similar message when you open the Classic control panel:
- "No Startup Volume. There is no volume with a system folder that supports starting Classic. Please install Mac OS 9.1 or later."
Solution
If you install Mac OS X on a computer that has Mac OS 9.0.4 or earlier installed, you will see a warning telling you that you need Mac OS 9.1 to run Classic.
If you have a reason not to update to Mac OS 9.1, you can use Mac OS 9.0.4 and Mac OS X on the same computer. However, you must also install a Mac OS 9.1 System Folder on the computer and designated it as the Classic startup volume. Because this requires having two Mac OS 9.x System Folders, the most manageable setup would include at least two hard disk partitions.