I've got a 1900XT which appears to have a 1900GT PPC ROM. This works fine with OSX 10.4 and 10.5 with supplied drivers.

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=12716&post_id=143703&viewmode=flat&sortorder=0&showonepost=1

[ Edited by amifrog 14.11.2020 - 20:29 ]