+#define VBE_SET_DISP_START_NOW 0
+#define VBE_SET_DISP_START_VBLANK 0x80
+int vbe_set_disp_start(int x, int y, int when);
+
+#define VBE_SCANLEN_PIXELS 0
+#define VBE_SCANLEN_BYTES 2
+int vbe_set_scanlen(int len, int mode);
+int vbe_get_scanlen(int mode);
+