diff --git a/src/mame/video/cps1.c b/src/mame/video/cps1.c
index 952b9d1df08..f198564b1c1 100644
--- a/src/mame/video/cps1.c
+++ b/src/mame/video/cps1.c
@@ -2950,8 +2950,8 @@ if (0 && screen.machine().input().code_pressed(KEYCODE_Z))
 
 SCREEN_VBLANK( cps1 )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		cps_state *state = screen.machine().driver_data<cps_state>();
 
diff --git a/src/mame/video/psikyo.c b/src/mame/video/psikyo.c
index e9df3b6fed3..a1b42d0a47c 100644
--- a/src/mame/video/psikyo.c
+++ b/src/mame/video/psikyo.c
@@ -867,8 +867,8 @@ SCREEN_UPDATE_IND16( psikyo_bootleg )
 
 SCREEN_VBLANK( psikyo )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		psikyo_state *state = screen.machine().driver_data<psikyo_state>();
 		memcpy(state->m_spritebuf2, state->m_spritebuf1, 0x2000);
diff --git a/src/mame/video/psikyosh.c b/src/mame/video/psikyosh.c
index d697e40018c..51ff9279b56 100644
--- a/src/mame/video/psikyosh.c
+++ b/src/mame/video/psikyosh.c
@@ -1310,8 +1310,8 @@ popmessage   ("%08x %08x %08x %08x\n%08x %08x %08x %08x",
 
 SCREEN_VBLANK( psikyosh )
 {
-	// rising edge
-	if (vblank_on)
+	// falling edge
+	if (!vblank_on)
 	{
 		address_space *space = screen.machine().device("maincpu")->memory().space(AS_PROGRAM);
 		buffer_spriteram32_w(space, 0, 0, 0xffffffff);