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[tyrone shoelaces]

Hey guys,
Per everything I have read the disk has to be partitioned and 9.2.2 installed on one, and 10.4 or whatever on the other...

I have a 1.42 mac mini and I have installed 9.2.2 and 10.4 on the same partition. Everything works fine, except I can't set it to boot back into 9 from X-- my 9.2 system folder does not show up in the X startup disk (everything works as expected when booted into 9). I have to boot off a USB stick with a system folder on it, and then use startup disk to set it back to 9.2.

Is there a workaround to bless the 9.2 system folder while booted into 10.4 and reboot?

Thanks everyone.

[aBc]

Which 9.2.2 installer did you use?

Try restarting holding down the Option key to access the boot picker to see if OS 9.2.2 appears as an option.

If not, then Tiger 10.4 might have allowed you to install OS 9.2.2 as a sort of “Classic” version and thus, not bootable.

[tyrone shoelaces]

it's the Ross image from here. Both OSes will boot, it's just that once you boot into 10.4, you can no longer use startup disk (or OF) to restart into 9. You have to boot into 9 from a different device, then use startup disk from there to select the internal drive. I suppose this is the exact situation that partitioning the drive would avoid.

[laulandn]

Is it possible that your mac is doing that on purpose?  ie it "knows" that it "can't boot into MacOS 9" natively and so is not showing it as an option in the System Preferences?

If anyone is running the Ross image, and DOES see MacOS 9 listed in Startup, then that is not what is going on.

[tyrone shoelaces]

Entirely possible that this is intentional behavior.

Regardless of that, it does seem that the only way to boot back into 9 from 10, when both are installed on the same partition is to boot into an OS9 CD, then use startup disk to select the 9 System Folder hard drive. OF startup menu only sees the 10 install on the drive.

If a partition is used for each, OF startup menu can be used.

In order to easily switch back and forth without partitioning, an OS X tool to select the OS 9 System Folder and reboot would be needed. To my knowledge, that doesn't exist.

[joevt]

What about the bless command in Mac OS X? It has Mac OS 9 boot selection options.
bless can affect the disk and nvram variables.

There's also the nvram command for setting Open Firmware nvram variables if nothing on the disk needs to be changed.

You can check for disk changes using the script at
 https://gist.github.com/joevt/a99e3af71343d8242e0078ab4af39b6c

Run it before and after changing the startup disk to see what gets changed. It shows stuff in the partition map and the volume Master Directory Blocks. Both contain boot related info.

[tyrone shoelaces]

that looks like it would work, and if so could be saved as a shell script for ease of use.  I will give it a try and report back.