Thanks. Now I'm still working on it.
I tried to use XFree86 to configure but I cannot set the screen to 16 / 32 bit color and cannot display nicely (sorry, I don't know how to use that word correctly in English - got noise or grabble or something like that
With xf86cfg, it showed that the vga card was not supported.
With xf86config, after configuration, xwindows can't load the driver.
Now temporary I make two files, one for xfree86 and another one for XF86_S3 (hopefully don't crash