3. Modelines

When constructing a modeline for use with the Sis driver you'll need to consider several points:

• H/W Acceleration. The H/W cursor, and fill operations currently allocate memory of the video ram for there own use. If this is not available these functions will automatically be disabled. Also, Turboqueue allocate 32k of Vram.
• Dot Clock. SiS documents the following video modes to work with 6326. The max dot clock allowable for your 6326 based board depends also on the memory installed on it. Option FastVram can be needed for high dot clocks to work. Of course, the memory installed must allow 1 cycle R/W.

  SiS recommended video modes for 6326:

  640x480 :

  4, 8, 15, 16, 24 bpp at 85Hz Non-interlaced

  800x600 :

  4, 8, 15, 16, 24 bpp at 85Hz Non-interlaced

  1024x768 :

  4, 8, 15, 16, 24 bpp at 85Hz Non-interlaced

  1280x1024 :

  4, 8, 15, 16, 24 bpp at 75Hz Non-interlaced

  1600x1200 :

  4, 8 bpp at 65Hz Non-interlaced