Cannot boot OS 9 CD after OS X installation

OS 9 is Classic, so I'm not sure what you mean. What model of Mac are you using? Macs made after a certain date cannot boot OS9, but can still run the Classic environment -- up to but not including the Intel Macs.

More information required!

 

I believe starting with the Mirrored Drive Door units that ability to boot into OS 9 off install CD was disabled. Please as a friendly reminder to all who post question provide information about model, OS, and other hardware specs so that we can help. Most of us our quite knowledgable about Apple computers, but the more you information the better the answer one can receive.

Classic is not the same as booting into OS 9. If one has OS 9 apps, your best bet is to boot into OS 9 to use them.

 

Only some of them. Some dual 1.25 MDDs were the last to boot into OS9; we have one in the office. The dual 1.42 MDD does not.

</pedant>

 

The MDD G4/DP867 in our office will not boot off OS 9 install CD, I know because I tried and keep getting a message that said something to the affect of not supported on this unit. I even sent a email message to Apple about this and they said the hardware will not boot off OS 9 install disc. You can install OS 9, and then under System Prefs>Startup Disc>select the OS 9 folder>restart.

 

You can get a listfrom Apple of the first revisions that won't boot in OS 9, anything on the list or newer won't boot in OS 9.

 

If you need Classic support, I believe most Mac restore discs have the Classic Installer on the disc.

 

I'm not sure I know what you mean. I said OS9 is Classic, which is true. There's virtually no need to ever boot into OS9 to use OS9 applications. If an application runs in booted OS9, it will almost certainly run perfectly in the Classic environment. I have only ever found one exception to this rule in the five or so years I've been using Classic in OSX.

Anyhow, the OP still needs to answer some questions if we're going to have any chance of helping him.

 

An example would be UT GOTY, I can't run this game in classic. The game is designed for OS 8.5 or something higher I believe, but will not work in the 'Classic' OS. Just one example.

 

And another? A game is the only example I have ever found. This is due to a graphics acceleration technology that Apple supported for only a short time. Because it was abandoned, it didn't make it to OSX and doesn't work in the Classic Environment. For virtually everything else, Classic works fine.

 

Um...

Not to sound TOO harsh, but don't you think it's time to move to OS X permanently?

I hear it's WAY BETTER than OS 9...

 

outshined
This might help:
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh763.html

 

Virtual PC 3

Dim and unhelpful comment...

 

Does it run in 9.2? The later versions of OS9 broke a few applications. I think possibly VPC 3.0 was one of them. I also just checked VPC 4.0. Apparently it's not compatible with Classic either. So that's four. A pretty short list, still.

 

MDD will boot from CD

Yes you can boot from the OS9 installer-CD but it has to be the original G4-CD that came with the MDD. I have one of the latest models, a 1.25 gig single-CPU.

Jörg.