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You need to use the OS 10.3 CD that came with your system to delete the existing system first. &nbsp;You'd start your MAc off the 10.3 CD/DVD, then go to the top menu, launch the disk utility, delete and recreate the partition, adding the &quot;write zeros to the drive&quot; option when creating the partition to cleanly wipe the disk. &nbsp;You'll then stop the reinstall of OS X before it starts, eject that CD, boot from he OS 9 CD and install OS 9.
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But, what about my files and softwares? will be lost?
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I've been trouble to use same software that require classic OS 9 , my mac has a OS X 10.3 system, I want to install Mac OS 9, I have the CD software , how can I do that, because when I tried it block saying its an old version.
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I've been trouble to use same software that require classic OS 9 , my mac has a OS X 10.3 system, I want to install Mac OS 9, I have the CD software , how can I do that, because when I tried it block saying its an old version.

You need to use the OS 10.3 CD that came with your system to delete the existing system first.  You&#39;d start your MAc off the 10.3 CD/DVD, then go to the top menu, launch the disk utility, delete and recreate the partition, adding the &quot;write zeros to the drive&quot; option when creating the partition to cleanly wipe the disk.  You&#39;ll then stop the reinstall of OS X before it starts, eject that CD, boot from he OS 9 CD and install OS 9.

But, what about my files and softwares? will be lost?

Install Mac OS X OS 9 in Mac with OSX 10.3

I&#39;ve been trouble to use same software that require classic OS 9 , my mac has a OS X 10.3 system, I want to install Mac OS 9, I have the CD software , how can I do that, because when I tried it block saying its an old version.

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.

Apple OS

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.