HelenOS sources

KC_N9             135 uspace/drv/hid/adb-kbd/ctl.c 	[0x5c] = KC_N9,
KC_N9             152 uspace/drv/hid/atkbd/atkbd.c 	[0x7d] = KC_N9,
KC_N9             147 uspace/drv/hid/usbhid/kbd/conv.c 	[0x61] = KC_N9,
KC_N9             145 uspace/drv/hid/xtkbd/xtkbd.c 	[0x49] = KC_N9,
KC_N9             168 uspace/srv/hid/input/ctl/sun.c 	[0x46] = KC_N9,
KC_N9             186 uspace/srv/hid/input/layout/ar.c 	[KC_N9] = '9',
KC_N9             215 uspace/srv/hid/input/layout/cz.c 	[KC_N9] = '9',
KC_N9             194 uspace/srv/hid/input/layout/fr_azerty.c 	[KC_N9] = '9',
KC_N9             195 uspace/srv/hid/input/layout/us_dvorak.c 	[KC_N9] = '9',
KC_N9             189 uspace/srv/hid/input/layout/us_qwerty.c 	[KC_N9] = '9',
HelenOS homepage, sources at GitHub