M_CRTC_INDEX
mga_setr(M_CRTC_INDEX, 0x0D, p0);
mga_setr(M_CRTC_INDEX, 0x0C, p1);
mga_setr(M_CRTC_INDEX, 17, hw->CRTC[17] & 0x7F);
mga_setr(M_CRTC_INDEX, i, hw->CRTC[i]);