diff --git a/src/mame/video/mcatadv.c b/src/mame/video/mcatadv.c
index 6212a7145da..f033ad1ccb3 100644
--- a/src/mame/video/mcatadv.c
+++ b/src/mame/video/mcatadv.c
@@ -271,8 +271,8 @@ VIDEO_START( mcatadv )
 
 SCREEN_VBLANK( mcatadv )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		mcatadv_state *state = screen.machine().driver_data<mcatadv_state>();
 		memcpy(state->m_spriteram_old, state->m_spriteram, state->m_spriteram_size);
diff --git a/src/mame/video/n8080.c b/src/mame/video/n8080.c
index 9622f3307a5..73c3a160485 100644
--- a/src/mame/video/n8080.c
+++ b/src/mame/video/n8080.c
@@ -354,8 +354,8 @@ SCREEN_UPDATE_IND16( helifire )
 
 SCREEN_VBLANK( helifire )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		n8080_state *state = screen.machine().driver_data<n8080_state>();
 		int n = (screen.machine().primary_screen->frame_number() >> 1) % sizeof state->m_helifire_LSFR;
diff --git a/src/mame/video/namcos1.c b/src/mame/video/namcos1.c
index c838fd93a66..41c584f60a5 100644
--- a/src/mame/video/namcos1.c
+++ b/src/mame/video/namcos1.c
@@ -442,8 +442,8 @@ SCREEN_UPDATE_IND16( namcos1 )
 
 SCREEN_VBLANK( namcos1 )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		namcos1_state *state = screen.machine().driver_data<namcos1_state>();
 		if (state->m_copy_sprites)
diff --git a/src/mame/video/taito_b.c b/src/mame/video/taito_b.c
index 96c72694095..9631470883f 100644
--- a/src/mame/video/taito_b.c
+++ b/src/mame/video/taito_b.c
@@ -505,8 +505,8 @@ SCREEN_UPDATE_RGB32( realpunc )
 
 SCREEN_VBLANK( taitob )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		taitob_state *state = screen.machine().driver_data<taitob_state>();
 		UINT8 video_control = tc0180vcu_get_videoctrl(state->m_tc0180vcu, 0);
diff --git a/src/mame/video/taito_f2.c b/src/mame/video/taito_f2.c
index 1e7eb543dc0..124d249a71b 100644
--- a/src/mame/video/taito_f2.c
+++ b/src/mame/video/taito_f2.c
@@ -893,8 +893,8 @@ static void taitof2_update_sprites_active_area( running_machine &machine )
 
 SCREEN_VBLANK( taitof2_no_buffer )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		taitof2_state *state = screen.machine().driver_data<taitof2_state>();
 
@@ -906,8 +906,8 @@ SCREEN_VBLANK( taitof2_no_buffer )
 
 SCREEN_VBLANK( taitof2_full_buffer_delayed )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		taitof2_state *state = screen.machine().driver_data<taitof2_state>();
 		UINT16 *spriteram = state->m_spriteram;
@@ -925,8 +925,8 @@ SCREEN_VBLANK( taitof2_full_buffer_delayed )
 
 SCREEN_VBLANK( taitof2_partial_buffer_delayed )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		taitof2_state *state = screen.machine().driver_data<taitof2_state>();
 		UINT16 *spriteram = state->m_spriteram;
@@ -944,8 +944,8 @@ SCREEN_VBLANK( taitof2_partial_buffer_delayed )
 
 SCREEN_VBLANK( taitof2_partial_buffer_delayed_thundfox )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		taitof2_state *state = screen.machine().driver_data<taitof2_state>();
 		UINT16 *spriteram = state->m_spriteram;
@@ -967,8 +967,8 @@ SCREEN_VBLANK( taitof2_partial_buffer_delayed_thundfox )
 
 SCREEN_VBLANK( taitof2_partial_buffer_delayed_qzchikyu )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		/* spriteram[2] and [3] are 1 frame behind...
            probably thundfox_eof_callback would work fine */
diff --git a/src/mame/video/taito_f3.c b/src/mame/video/taito_f3.c
index 33a292b6eff..2736bddb450 100644
--- a/src/mame/video/taito_f3.c
+++ b/src/mame/video/taito_f3.c
@@ -517,7 +517,8 @@ static TILE_GET_INFO( get_tile_info_pixel )
 
 SCREEN_VBLANK( f3 )
 {
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		taito_f3_state *state = screen.machine().driver_data<taito_f3_state>();
 		if (state->m_sprite_lag==2)
diff --git a/src/mame/video/taito_l.c b/src/mame/video/taito_l.c
index 61d35c9d8c6..82738088440 100644
--- a/src/mame/video/taito_l.c
+++ b/src/mame/video/taito_l.c
@@ -329,8 +329,8 @@ SCREEN_UPDATE_IND16( taitol )
 
 SCREEN_VBLANK( taitol )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		taitol_state *state = screen.machine().driver_data<taitol_state>();
 		UINT8 *spriteram = state->m_rambanks + 0xb000;