CRTC_HSYNC_DIS
val &= ~(CRTC_DISPLAY_DIS | CRTC_HSYNC_DIS |
val |= (CRTC_DISPLAY_DIS | CRTC_HSYNC_DIS);
CRTC_HSYNC_DIS);
~(CRTC_HSYNC_DIS | CRTC_VSYNC_DIS | CRTC_DISPLAY_DIS));