Oddly enough, Gerhard Eichhoff sends word that Micosoft, has some new Diamond Viper550 drivers.
Viper V550 ver.4.10.01.0252 http://www.microsoft.com/isapi/hwtest/nDetail.idc?CN= Diamond+Multimedia&DT =Display+Adapter&DN=Viper+V550+ Ver.4.10.01.0252&DB=AGP&SP=PC+97&x=17&y=11
