Any PowerPC mac (G3, G4, G5) can run applications in classic. If you need to run OS 9 natively, these docs will help you find a computer:
http://docs.info.apple.com/article.html?artnum=25114 http://docs.info.apple.com/article.html?artnum=86209
If you need OS 9 natively, a PowerMac G4 that supports it would be the best bet. If you just need classic, a G5 would run OS X and OS 9 well. However, I would consider getting a PowerMac G4 (you can get a Quicksilver for under $200 these days), then getting a lower-end intel mac (refurbished are up to $35% off). As well as OS 9 may work for you, it isn't a good idea to be stuck on one platform - for security, and support reasons. I would then work on converting your files - which is possible, it seems:
http://livedocs.adobe.com/en_US/InDe...cb3f-6d44.html http://www.markzware.com/pm2q/ http://www.google.com/search?q=trans...&start=10&sa=N
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Power to Burn.
At speeds of up to 733MHz,
The most powerful Mac in history
burns CDs, burns DVDs, and
burns Pentiums
- apple website, oct 4, 1999. advertisement for the powermac g4