diff --git a/src/mame/drivers/vicdual.cpp b/src/mame/drivers/vicdual.cpp
index e768f20dc2c..c6711fde550 100644
--- a/src/mame/drivers/vicdual.cpp
+++ b/src/mame/drivers/vicdual.cpp
@@ -35,7 +35,7 @@
           switch between them.
         * There existed a vertical version of Head On as well.
         * According to the manuals, Borderline has the same sound
-          board as Tranquilizer Gun.
+          board as Tranquillizer Gun.
 
     Known issues/to-do's:
         * Analog sound missing in many games
@@ -1093,7 +1093,7 @@ void vicdual_state::digger(machine_config &config)
  *  Invinco / Head On 2
  *  Invinco / Deap Scan
  *  Space Attack / Head On
- *  Tranquilizer Gun
+ *  Tranquillizer Gun
  *  Space Trek
  *  Carnival
  *  Borderline
@@ -4017,7 +4017,7 @@ GAME( 1980, samurai,    0,        samurai,   samurai,   vicdual_state,  empty_in
 GAME( 1979, invinco,    0,        invinco,   invinco,   vicdual_state,  empty_init, ROT270, "Sega", "Invinco", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
 GAME( 1979, invds,      0,        invds,     invds,     vicdual_state,  empty_init, ROT270, "Sega", "Invinco / Deep Scan", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
 GAME( 1979, carhntds,   0,        carhntds,  carhntds,  vicdual_state,  empty_init, ROT270, "Sega", "Car Hunt / Deep Scan (France)", MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )
-GAME( 1980, tranqgun,   0,        tranqgun,  tranqgun,  vicdual_state,  empty_init, ROT270, "Sega", "Tranquilizer Gun", MACHINE_SUPPORTS_SAVE )
+GAME( 1980, tranqgun,   0,        tranqgun,  tranqgun,  vicdual_state,  empty_init, ROT270, "Sega", "Tranquillizer Gun", MACHINE_SUPPORTS_SAVE )
 GAME( 1980, spacetrk,   0,        spacetrk,  spacetrk,  vicdual_state,  empty_init, ROT270, "Sega", "Space Trek (upright)", MACHINE_IMPERFECT_GRAPHICS | MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )
 GAME( 1980, spacetrkc,  spacetrk, spacetrk,  spacetrkc, vicdual_state,  empty_init, ROT270, "Sega", "Space Trek (cocktail)", MACHINE_IMPERFECT_GRAPHICS |MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )
 GAME( 1980, carnival,   0,        carnival,  carnival,  carnival_state, empty_init, ROT270, "Sega", "Carnival (upright, AY8912 music)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
@@ -4030,7 +4030,7 @@ GAME( 1981, brdrline,   0,        brdrline,  brdrline,  vicdual_state,  empty_in
 GAME( 1981, starrkr,    brdrline, brdrline,  starrkr,   vicdual_state,  empty_init, ROT270, "Sega", "Star Raker", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
 GAME( 1981, brdrlins,   brdrline, brdrline,  brdrline,  vicdual_state,  empty_init, ROT270, "bootleg (Sidam)", "Borderline (Sidam bootleg)", MACHINE_SUPPORTS_SAVE )
 GAME( 1981, brdrlinb,   brdrline, brdrline,  brdrline,  vicdual_state,  empty_init, ROT270, "bootleg (Karateco)", "Borderline (Karateco bootleg)", MACHINE_SUPPORTS_SAVE )
-GAME( 1981, brdrlinet,  brdrline, tranqgun,  tranqgun,  vicdual_state,  empty_init, ROT270, "Sega", "Borderline (Tranquilizer Gun conversion)", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE ) // official factory conversion
+GAME( 1981, brdrlinet,  brdrline, tranqgun,  tranqgun,  vicdual_state,  empty_init, ROT270, "Sega", "Borderline (Tranquillizer Gun conversion)", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE ) // official factory conversion
 GAME( 198?, startrks,   0,        headons,   headons,   vicdual_state,  empty_init, ROT0,   "bootleg (Sidam)", "Star Trek (Head On hardware)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
 GAME( 1980, digger,     0,        digger,    digger,    vicdual_state,  empty_init, ROT270, "Sega", "Digger", MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )
 GAME( 1981, pulsar,     0,        pulsar,    pulsar,    vicdual_state,  empty_init, ROT270, "Sega", "Pulsar", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )