diff --git a/src/mame/drivers/rungun.cpp b/src/mame/drivers/rungun.cpp
index 06604ae29ea..5656cbed9bf 100644
--- a/src/mame/drivers/rungun.cpp
+++ b/src/mame/drivers/rungun.cpp
@@ -389,8 +389,7 @@ void rungun_state::machine_start()
 	membank("bank2")->configure_entries(0, 8, &ROM[0x10000], 0x4000);
 
 	m_banked_ram = auto_alloc_array_clear(machine(), UINT16, 0x2000);
-	m_pal_ram = std::make_unique<UINT16[]>(0x800*2);
-	memset(m_pal_ram.get(), 0, sizeof(UINT16) * 0x800 * 2);
+	m_pal_ram = make_unique_clear<UINT16[]>(0x800*2);
 	membank("spriteram_bank")->configure_entries(0,2,&m_banked_ram[0],0x2000);
 	
 	
diff --git a/src/mame/drivers/saturn.cpp b/src/mame/drivers/saturn.cpp
index 049dd17dcf4..13dec46c418 100644
--- a/src/mame/drivers/saturn.cpp
+++ b/src/mame/drivers/saturn.cpp
@@ -1209,12 +1209,9 @@ void sat_console_state::saturn_init_driver(int rgn)
 	m_minit_boost_timeslice = attotime::zero;
 	m_sinit_boost_timeslice = attotime::zero;
 
-	m_scu_regs = std::make_unique<UINT32[]>(0x100/4);
-	memset(m_scu_regs.get(), 0, sizeof(UINT32) * 0x100 / 4);
-	m_scsp_regs = std::make_unique<UINT16[]>(0x1000/2);
-	memset(m_scu_regs.get(), 0, sizeof(UINT16) * 0x1000 / 2);
-	m_backupram = std::make_unique<UINT8[]>(0x8000);
-	memset(m_scu_regs.get(), 0, sizeof(UINT8) * 0x8000);
+	m_scu_regs = make_unique_clear<UINT32[]>(0x100/4);
+	m_scsp_regs = make_unique_clear<UINT16[]>(0x1000/2);
+	m_backupram = make_unique_clear<UINT8[]>(0x8000);
 }
 
 DRIVER_INIT_MEMBER(sat_console_state,saturnus)
diff --git a/src/mame/drivers/vboy.cpp b/src/mame/drivers/vboy.cpp
index 2f0e15c7802..0ea093a5602 100644
--- a/src/mame/drivers/vboy.cpp
+++ b/src/mame/drivers/vboy.cpp
@@ -235,8 +235,7 @@ void vboy_state::video_start()
 	m_r_frame_1 = auto_alloc_array_clear(machine(), UINT8, 0x6000);
 
 	m_font  = auto_alloc_array_clear(machine(), UINT16, (0x8000 >> 1)*4 * 2);
-	m_bgmap = std::make_unique<UINT16[]>(0x20000 >> 1);
-	memset(m_bgmap.get(), 0, sizeof(UINT16) * (0x20000 >> 1));
+	m_bgmap = make_unique_clear<UINT16[]>(0x20000 >> 1);
 }
 
 void vboy_state::put_obj(bitmap_ind16 &bitmap, const rectangle &cliprect, int x, int y, UINT16 code, UINT8 pal)
diff --git a/src/mame/video/k053246_k053247_k055673.cpp b/src/mame/video/k053246_k053247_k055673.cpp
index fe18006cad7..fc9bc1581eb 100644
--- a/src/mame/video/k053246_k053247_k055673.cpp
+++ b/src/mame/video/k053246_k053247_k055673.cpp
@@ -1129,8 +1129,7 @@ void k053247_device::device_start()
 
 	m_gfx = m_gfxdecode->gfx(m_gfx_num);
 
-	m_ram = std::make_unique<UINT16[]>(0x1000 / 2);
-	memset(m_ram.get(), 0, sizeof(UINT16) * 0x1000 / 2);
+	m_ram = make_unique_clear<UINT16[]>(0x1000 / 2);
 
 	save_pointer(NAME(m_ram.get()), 0x1000 / 2);
 	save_item(NAME(m_kx46_regs));