[Àû¿ë´ë»ó: 0.74_SVN_new, DOSBox-x]

When emulating High Sierra highcolor RAMDAC, assume 5:6:5 at all times if set. Else,
bit 6 of the DAC command selects between 5:5:5 and 5:6:5. Set this option for demos or games that got the command byte wrong (MFX Transgrassion 2) or any other demo that is not rendering highcolor 16bpp correctly.