HelenOS sources

KBD_SCANCODE_SET_EXTENDED  220 uspace/drv/hid/atkbd/atkbd.c 		if (code == KBD_SCANCODE_SET_EXTENDED) {
KBD_SCANCODE_SET_EXTENDED  253 uspace/drv/hid/xtkbd/xtkbd.c 		if (code == KBD_SCANCODE_SET_EXTENDED) {
HelenOS homepage, sources at GitHub