If you are still looking for the Radeon 9200 driver for OS 9, I've made it available from the PPCMLA downloads. This is the driver that came on the CD with the card. I think there was an update in 2004, but I can't really remember anymore, and I can't find any copies to download anyway.

http://www.ppcmla.com/downloads/ATI_Radeon_9200_-_OS9.sit.hqx

Peace,
Drew
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Power to the PowerPC!