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Apple Computing Products:
macOS - Operating System
OSX and Classic.
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<blockquote data-quote="johntalin" data-source="post: 305825" data-attributes="member: 24431"><p>If you already have OS9 on your HD, then you install OS10 by selecting "Archive and Install" to preserve OS9 and also to add OS10. After this installation, Classic will run with your old programs. You can also run your old programs by chosing "Startup Disk" and switching to OS9 system from OS10 System and vice versa. In that case you don't need Classic. If you are doing a clean install and OS10 is the first system you are installing, then you can add OS9 to it later. Either way it works. I have not upgraded OS10 yet, but I agree with MacHeadCase that the upgrade for OS10 should not affect OS9.</p><p>You should end up with two separate System Folders.</p><p>:flower:</p></blockquote><p></p>
[QUOTE="johntalin, post: 305825, member: 24431"] If you already have OS9 on your HD, then you install OS10 by selecting "Archive and Install" to preserve OS9 and also to add OS10. After this installation, Classic will run with your old programs. You can also run your old programs by chosing "Startup Disk" and switching to OS9 system from OS10 System and vice versa. In that case you don't need Classic. If you are doing a clean install and OS10 is the first system you are installing, then you can add OS9 to it later. Either way it works. I have not upgraded OS10 yet, but I agree with MacHeadCase that the upgrade for OS10 should not affect OS9. You should end up with two separate System Folders. :flower: [/QUOTE]
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Apple Computing Products:
macOS - Operating System
OSX and Classic.
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