HelenOS sources

KC_N5             130 uspace/drv/hid/adb-kbd/ctl.c 	[0x57] = KC_N5,
KC_N5             154 uspace/drv/hid/atkbd/atkbd.c 	[0x73] = KC_N5,
KC_N5             143 uspace/drv/hid/usbhid/kbd/conv.c 	[0x5d] = KC_N5,
KC_N5             147 uspace/drv/hid/xtkbd/xtkbd.c 	[0x4c] = KC_N5,
KC_N5             190 uspace/srv/hid/input/ctl/sun.c 	[0x5c] = KC_N5,
KC_N5             188 uspace/srv/hid/input/layout/ar.c 	[KC_N5] = '5',
KC_N5             217 uspace/srv/hid/input/layout/cz.c 	[KC_N5] = '5',
KC_N5             196 uspace/srv/hid/input/layout/fr_azerty.c 	[KC_N5] = '5',
KC_N5             197 uspace/srv/hid/input/layout/us_dvorak.c 	[KC_N5] = '5',
KC_N5             191 uspace/srv/hid/input/layout/us_qwerty.c 	[KC_N5] = '5',
HelenOS homepage, sources at GitHub