Vielleicht liegts auch an den Treibern.
Version 1.08.03 BETA
Voodoo3 Windows® 9x/ME Voodoo Community Driver Kit 1.08.03
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Voodoo Series Driver Kit: 1.08.03
Voodoo Series Win9x 2D/3D Display Drivers: 4.12.01.0666
Glide(tm) 2.X Driver: 2.61.00.0674
Glide 3.X Driver: 3.10.00.0674
OpenGL(r) Driver Version: 1.0.0.0761 JoFSh Updated
3dfx Tools Version: 2.6.2.228