SCAN_PREFIX
if (scancode & SCAN_PREFIX) {
sc->sc_buffered_char[0] &= ~SCAN_PREFIX;
if (scancode & SCAN_PREFIX) {
sc->sc_buffered_char[0] = (scancode & ~SCAN_PREFIX);
if (code & SCAN_PREFIX) {
sc->sc_buffered_char[1] = (code & ~SCAN_PREFIX);
sc->sc_buffered_char[0] = (code & ~SCAN_PREFIX);