Upgrade to 10.4 Still Boot in 9.22

Can I upgrade my G4, which is running 9.22 and 10.39 to 10.4, and still select whether to boot in 9.22 or 10.4. I don't want or need Classic support, I just want to be able to choose to be able to boot 9.22 or 10.4
G4   Mac OS X (10.3.9)  

I have two G4s from the older models (before the mirror-drive models). One is the CD burner model, the other is DVD player/Zip drive.
They are 400/450 MHz, respectively, and 384 MB of RAM. They both run 10.3.9 just fine... I can't do anything too crazy (any 'high tech' game from the last few years won't work) but watching movies, using my browser, even encoding movies or using Photoshop are fine.
You'll have to upgrade your firmware. Go to http://docs.info.apple.com/article.html?artnum=86117 and, in the PowerMac G4 section, download download document no. 120068 (far-right column). Its easy and quick and comes with instructions.
I recommend installing Classic (which it should by default) until you are sure you dont need to use any OS 9 software while you install OS X stuff that didn't come with OS X.
A tip: do a custom install (a button appears in the install window a few clicks in) and remove all the languages that you don't need. you can remove printer drivers from the installation, too (they're always available for free off the manufacturer's website if you do need to print in the future). The installation will take less time and less space on your hard drive.

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