HelenOS sources

KC_N6             131 uspace/drv/hid/adb-kbd/ctl.c 	[0x58] = KC_N6,
KC_N6             155 uspace/drv/hid/atkbd/atkbd.c 	[0x74] = KC_N6,
KC_N6             144 uspace/drv/hid/usbhid/kbd/conv.c 	[0x5e] = KC_N6,
KC_N6             148 uspace/drv/hid/xtkbd/xtkbd.c 	[0x4d] = KC_N6,
KC_N6             191 uspace/srv/hid/input/ctl/sun.c 	[0x5d] = KC_N6,
KC_N6             189 uspace/srv/hid/input/layout/ar.c 	[KC_N6] = '6',
KC_N6             218 uspace/srv/hid/input/layout/cz.c 	[KC_N6] = '6',
KC_N6             197 uspace/srv/hid/input/layout/fr_azerty.c 	[KC_N6] = '6',
KC_N6             198 uspace/srv/hid/input/layout/us_dvorak.c 	[KC_N6] = '6',
KC_N6             192 uspace/srv/hid/input/layout/us_qwerty.c 	[KC_N6] = '6',
HelenOS homepage, sources at GitHub