crtc_write_1
crtc_write_1(0, 10);
crtc_write_1(1, cursor_shape >> 8);
crtc_write_1(0, 11);
crtc_write_1(1, cursor_shape);
crtc_write_1(0, 10);
crtc_write_1(0, 11);
crtc_write_1(0, 14);
crtc_write_1(1, pos >> 8);
crtc_write_1(0, 15);
crtc_write_1(1, pos);