i did a google on ATI retail updates and a few places popped up

http://www.google.com/search?num=30&hl=en&client=safari&rls=en&q=ATI+Retail+Update&btnG=Search

also web archive pulled up this

http://web.archive.org/web/20050212132639/www.ati.com/support/drivers/mac/macos-jan-2005-update.html

but if you click on to download, it takes you to AMD/ATI site but they are fresh out of drivers for Mac OS 9
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Beige G3 AIO:
Rev B rom, Rev 2 mobo, G3 466mhz, 448mb ram, WD 120gb HDD, Pioneer DVR-110D, ATI Radeon 7000, USB PCI, OS 9.2.2 and OS X 10.4.8