diff --git a/src/mame/drivers/ultraman.cpp b/src/mame/drivers/ultraman.cpp
index f9859d1eae0..67d6bd5facb 100644
--- a/src/mame/drivers/ultraman.cpp
+++ b/src/mame/drivers/ultraman.cpp
@@ -42,12 +42,12 @@ void ultraman_state::main_map(address_map &map)
 	map(0x1c0021, 0x1c0021).w(m_soundlatch, FUNC(generic_latch_8_device::write));
 	map(0x1c0029, 0x1c0029).w(m_soundnmi, FUNC(input_merger_device::in_set<0>));
 	map(0x1c0030, 0x1c0031).w("watchdog", FUNC(watchdog_timer_device::reset16_w));
-	map(0x204000, 0x204fff).rw(m_k051316_1, FUNC(k051316_device::read), FUNC(k051316_device::write)).umask16(0x00ff); /* K051316 #0 RAM */
-	map(0x205000, 0x205fff).rw(m_k051316_2, FUNC(k051316_device::read), FUNC(k051316_device::write)).umask16(0x00ff); /* K051316 #1 RAM */
-	map(0x206000, 0x206fff).rw(m_k051316_3, FUNC(k051316_device::read), FUNC(k051316_device::write)).umask16(0x00ff); /* K051316 #2 RAM */
-	map(0x207f80, 0x207f9f).w(m_k051316_1, FUNC(k051316_device::ctrl_w)).umask16(0x00ff);   /* K051316 #0 registers */
-	map(0x207fa0, 0x207fbf).w(m_k051316_2, FUNC(k051316_device::ctrl_w)).umask16(0x00ff);   /* K051316 #1 registers */
-	map(0x207fc0, 0x207fdf).w(m_k051316_3, FUNC(k051316_device::ctrl_w)).umask16(0x00ff);   /* K051316 #2 registers */
+	map(0x204000, 0x204fff).rw(m_k051316[0], FUNC(k051316_device::read), FUNC(k051316_device::write)).umask16(0x00ff); /* K051316 #0 RAM */
+	map(0x205000, 0x205fff).rw(m_k051316[1], FUNC(k051316_device::read), FUNC(k051316_device::write)).umask16(0x00ff); /* K051316 #1 RAM */
+	map(0x206000, 0x206fff).rw(m_k051316[2], FUNC(k051316_device::read), FUNC(k051316_device::write)).umask16(0x00ff); /* K051316 #2 RAM */
+	map(0x207f80, 0x207f9f).w(m_k051316[0], FUNC(k051316_device::ctrl_w)).umask16(0x00ff);   /* K051316 #0 registers */
+	map(0x207fa0, 0x207fbf).w(m_k051316[1], FUNC(k051316_device::ctrl_w)).umask16(0x00ff);   /* K051316 #1 registers */
+	map(0x207fc0, 0x207fdf).w(m_k051316[2], FUNC(k051316_device::ctrl_w)).umask16(0x00ff);   /* K051316 #2 registers */
 	map(0x304000, 0x30400f).rw(m_k051960, FUNC(k051960_device::k051937_r), FUNC(k051960_device::k051937_w)).umask16(0x00ff);       /* Sprite control */
 	map(0x304800, 0x304fff).rw(m_k051960, FUNC(k051960_device::k051960_r), FUNC(k051960_device::k051960_w)).umask16(0x00ff);       /* Sprite RAM */
 }
@@ -160,16 +160,14 @@ INPUT_PORTS_END
 
 void ultraman_state::machine_start()
 {
-	save_item(NAME(m_bank0));
-	save_item(NAME(m_bank1));
-	save_item(NAME(m_bank2));
+	save_item(NAME(m_bank));
 }
 
 void ultraman_state::machine_reset()
 {
-	m_bank0 = -1;
-	m_bank1 = -1;
-	m_bank2 = -1;
+	m_bank[0] = -1;
+	m_bank[1] = -1;
+	m_bank[2] = -1;
 
 	m_soundnmi->in_w<0>(0);
 }
diff --git a/src/mame/includes/ultraman.h b/src/mame/includes/ultraman.h
index ffa2625d238..d17e673d037 100644
--- a/src/mame/includes/ultraman.h
+++ b/src/mame/includes/ultraman.h
@@ -16,26 +16,22 @@ class ultraman_state : public driver_device
 {
 public:
 	ultraman_state(const machine_config &mconfig, device_type type, const char *tag)
-		: driver_device(mconfig, type, tag),
-		m_maincpu(*this, "maincpu"),
-		m_audiocpu(*this, "audiocpu"),
-		m_k051316_1(*this, "k051316_1"),
-		m_k051316_2(*this, "k051316_2"),
-		m_k051316_3(*this, "k051316_3"),
-		m_k051960(*this, "k051960"),
-		m_soundlatch(*this, "soundlatch"),
-		m_soundnmi(*this, "soundnmi") { }
+		: driver_device(mconfig, type, tag)
+		, m_maincpu(*this, "maincpu")
+		, m_audiocpu(*this, "audiocpu")
+		, m_k051316(*this, "k051316_%u", 1)
+		, m_k051960(*this, "k051960")
+		, m_soundlatch(*this, "soundlatch")
+		, m_soundnmi(*this, "soundnmi")
+	{
+	}
 
-	int        m_bank0;
-	int        m_bank1;
-	int        m_bank2;
+	int        m_bank[3];
 
 	/* devices */
 	required_device<cpu_device> m_maincpu;
 	required_device<cpu_device> m_audiocpu;
-	required_device<k051316_device> m_k051316_1;
-	required_device<k051316_device> m_k051316_2;
-	required_device<k051316_device> m_k051316_3;
+	required_device_array<k051316_device, 3> m_k051316;
 	required_device<k051960_device> m_k051960;
 	required_device<generic_latch_8_device> m_soundlatch;
 	required_device<input_merger_device> m_soundnmi;
diff --git a/src/mame/video/ultraman.cpp b/src/mame/video/ultraman.cpp
index 38390784150..89455909f53 100644
--- a/src/mame/video/ultraman.cpp
+++ b/src/mame/video/ultraman.cpp
@@ -29,7 +29,7 @@ K051316_CB_MEMBER(ultraman_state::zoom_callback_1)
 {
 	enum { zoom_colorbase_1 = 0 / 16 };
 
-	*code |= ((*color & 0x07) << 8) | (m_bank0 << 11);
+	*code |= ((*color & 0x07) << 8) | (m_bank[0] << 11);
 	*color = zoom_colorbase_1 + ((*color & 0xf8) >> 3);
 }
 
@@ -37,14 +37,14 @@ K051316_CB_MEMBER(ultraman_state::zoom_callback_2)
 {
 	enum { zoom_colorbase_2 = 1024 / 16 };
 
-	*code |= ((*color & 0x07) << 8) | (m_bank1 << 11);
+	*code |= ((*color & 0x07) << 8) | (m_bank[1] << 11);
 	*color = zoom_colorbase_2 + ((*color & 0xf8) >> 3);
 }
 
 K051316_CB_MEMBER(ultraman_state::zoom_callback_3)
 {
 	enum { zoom_colorbase_3 = 2048 / 16 };
-	*code |= ((*color & 0x07) << 8) | (m_bank2 << 11);
+	*code |= ((*color & 0x07) << 8) | (m_bank[2] << 11);
 	*color = zoom_colorbase_3 + ((*color & 0xf8) >> 3);
 }
 
@@ -69,28 +69,28 @@ WRITE16_MEMBER(ultraman_state::ultraman_gfxctrl_w)
 		    bit 6: coin counter 1
 		    bit 7: coin counter 2 */
 
-		m_k051316_1->wraparound_enable(data & 0x01);
+		m_k051316[0]->wraparound_enable(data & 0x01);
 
-		if (m_bank0 != ((data & 0x02) >> 1))
+		if (m_bank[0] != ((data & 0x02) >> 1))
 		{
-			m_bank0 = (data & 0x02) >> 1;
-			m_k051316_1->mark_tmap_dirty();
+			m_bank[0] = (data & 0x02) >> 1;
+			m_k051316[0]->mark_tmap_dirty();
 		}
 
-		m_k051316_2->wraparound_enable(data & 0x04);
+		m_k051316[1]->wraparound_enable(data & 0x04);
 
-		if (m_bank1 != ((data & 0x08) >> 3))
+		if (m_bank[1] != ((data & 0x08) >> 3))
 		{
-			m_bank1 = (data & 0x08) >> 3;
-			m_k051316_2->mark_tmap_dirty();
+			m_bank[1] = (data & 0x08) >> 3;
+			m_k051316[1]->mark_tmap_dirty();
 		}
 
-		m_k051316_3->wraparound_enable(data & 0x10);
+		m_k051316[2]->wraparound_enable(data & 0x10);
 
-		if (m_bank2 != ((data & 0x20) >> 5))
+		if (m_bank[2] != ((data & 0x20) >> 5))
 		{
-			m_bank2 = (data & 0x20) >> 5;
-			m_k051316_3->mark_tmap_dirty();
+			m_bank[2] = (data & 0x20) >> 5;
+			m_k051316[2]->mark_tmap_dirty();
 		}
 
 		machine().bookkeeping().coin_counter_w(0, data & 0x40);
@@ -110,9 +110,9 @@ uint32_t ultraman_state::screen_update_ultraman(screen_device &screen, bitmap_in
 {
 	screen.priority().fill(0, cliprect);
 
-	m_k051316_3->zoom_draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);
-	m_k051316_2->zoom_draw(screen, bitmap, cliprect, 0, 0);
-	m_k051316_1->zoom_draw(screen, bitmap, cliprect, 0, 1);
+	m_k051316[2]->zoom_draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);
+	m_k051316[1]->zoom_draw(screen, bitmap, cliprect, 0, 0);
+	m_k051316[0]->zoom_draw(screen, bitmap, cliprect, 0, 1);
 	m_k051960->k051960_sprites_draw(bitmap, cliprect, screen.priority(), -1, -1);
 	return 0;
 }