diff --git a/src/mame/drivers/asuka.c b/src/mame/drivers/asuka.c
index 2e305349b92..8ae60b92212 100644
--- a/src/mame/drivers/asuka.c
+++ b/src/mame/drivers/asuka.c
@@ -819,12 +819,12 @@ static const tc0100scn_interface cadash_tc0100scn_intf =
 
 static const pc090oj_interface asuka_pc090oj_intf =
 {
-	0, 0, 8, 0
+	0, 0, 8, 1
 };
 
-static const pc090oj_interface cadash_pc090oj_intf =
+static const pc090oj_interface bonzeadv_pc090oj_intf =
 {
-	0, 0, 8, 1
+	0, 0, 8, 0
 };
 
 static const tc0110pcr_interface asuka_tc0110pcr_intf =
@@ -876,7 +876,7 @@ static MACHINE_RESET( asuka )
 
 static SCREEN_VBLANK( asuka )
 {
-	if (vblank_on)
+	if (!vblank_on)
 	{
 		asuka_state *state = screen.machine().driver_data<asuka_state>();
 		pc090oj_eof_callback(state->m_pc090oj);
@@ -922,7 +922,7 @@ static MACHINE_CONFIG_START( bonzeadv, asuka_state )
 	MCFG_GFXDECODE(asuka)
 	MCFG_PALETTE_LENGTH(4096)
 
-	MCFG_PC090OJ_ADD("pc090oj", asuka_pc090oj_intf)
+	MCFG_PC090OJ_ADD("pc090oj", bonzeadv_pc090oj_intf)
 	MCFG_TC0100SCN_ADD("tc0100scn", asuka_tc0100scn_intf)
 	MCFG_TC0110PCR_ADD("tc0110pcr", asuka_tc0110pcr_intf)
 
@@ -1019,7 +1019,7 @@ static MACHINE_CONFIG_START( cadash, asuka_state )
 	MCFG_GFXDECODE(asuka)
 	MCFG_PALETTE_LENGTH(4096)
 
-	MCFG_PC090OJ_ADD("pc090oj", cadash_pc090oj_intf)
+	MCFG_PC090OJ_ADD("pc090oj", asuka_pc090oj_intf)
 	MCFG_TC0100SCN_ADD("tc0100scn", cadash_tc0100scn_intf)
 	MCFG_TC0110PCR_ADD("tc0110pcr", asuka_tc0110pcr_intf)
 
@@ -1063,7 +1063,7 @@ static MACHINE_CONFIG_START( mofflott, asuka_state )
 	MCFG_GFXDECODE(asuka)
 	MCFG_PALETTE_LENGTH(4096)	/* only Mofflott uses full palette space */
 
-	MCFG_PC090OJ_ADD("pc090oj", asuka_pc090oj_intf)
+	MCFG_PC090OJ_ADD("pc090oj", bonzeadv_pc090oj_intf)
 	MCFG_TC0100SCN_ADD("tc0100scn", cadash_tc0100scn_intf)
 	MCFG_TC0110PCR_ADD("tc0110pcr", asuka_tc0110pcr_intf)
 
@@ -1111,7 +1111,7 @@ static MACHINE_CONFIG_START( galmedes, asuka_state )
 	MCFG_GFXDECODE(asuka)
 	MCFG_PALETTE_LENGTH(4096)	/* only Mofflott uses full palette space */
 
-	MCFG_PC090OJ_ADD("pc090oj", asuka_pc090oj_intf)
+	MCFG_PC090OJ_ADD("pc090oj", bonzeadv_pc090oj_intf)
 	MCFG_TC0100SCN_ADD("tc0100scn", cadash_tc0100scn_intf)
 	MCFG_TC0110PCR_ADD("tc0110pcr", asuka_tc0110pcr_intf)
 
@@ -1155,7 +1155,7 @@ static MACHINE_CONFIG_START( eto, asuka_state )
 	MCFG_GFXDECODE(asuka)
 	MCFG_PALETTE_LENGTH(4096)
 
-	MCFG_PC090OJ_ADD("pc090oj", asuka_pc090oj_intf)
+	MCFG_PC090OJ_ADD("pc090oj", bonzeadv_pc090oj_intf)
 	MCFG_TC0100SCN_ADD("tc0100scn", cadash_tc0100scn_intf)
 	MCFG_TC0110PCR_ADD("tc0110pcr", asuka_tc0110pcr_intf)
 
diff --git a/src/mame/drivers/bbusters.c b/src/mame/drivers/bbusters.c
index adbd7cfb751..f94a1905ed0 100644
--- a/src/mame/drivers/bbusters.c
+++ b/src/mame/drivers/bbusters.c
@@ -700,7 +700,7 @@ static MACHINE_CONFIG_START( bbusters, bbusters_state )
 	MCFG_NVRAM_ADD_0FILL("eeprom")
 
 	/* video hardware */
-	MCFG_VIDEO_ATTRIBUTES(VIDEO_BUFFERS_SPRITERAM)
+	MCFG_VIDEO_ATTRIBUTES(VIDEO_BUFFERS_SPRITERAM | VIDEO_UPDATE_AFTER_VBLANK)
 
 	MCFG_SCREEN_ADD("screen", RASTER)
 	MCFG_SCREEN_REFRESH_RATE(60)
@@ -737,7 +737,7 @@ static MACHINE_CONFIG_START( mechatt, bbusters_state )
 	MCFG_CPU_IO_MAP(sounda_portmap)
 
 	/* video hardware */
-	MCFG_VIDEO_ATTRIBUTES(VIDEO_BUFFERS_SPRITERAM)
+	MCFG_VIDEO_ATTRIBUTES(VIDEO_BUFFERS_SPRITERAM | VIDEO_UPDATE_AFTER_VBLANK)
 
 	MCFG_SCREEN_ADD("screen", RASTER)
 	MCFG_SCREEN_REFRESH_RATE(60)
diff --git a/src/mame/drivers/dec8.c b/src/mame/drivers/dec8.c
index 01cd7ed5a8e..b133b2a9b2d 100644
--- a/src/mame/drivers/dec8.c
+++ b/src/mame/drivers/dec8.c
@@ -2065,7 +2065,7 @@ static MACHINE_CONFIG_START( ghostb, dec8_state )
 	MCFG_MACHINE_RESET(dec8)
 
 	/* video hardware */
-	MCFG_VIDEO_ATTRIBUTES(VIDEO_BUFFERS_SPRITERAM)
+	MCFG_VIDEO_ATTRIBUTES(VIDEO_BUFFERS_SPRITERAM | VIDEO_UPDATE_AFTER_VBLANK)
 
 	MCFG_DEVICE_ADD("tilegen1", DECO_BAC06, 0)
 	deco_bac06_device::set_gfx_region_wide(*device, 2,2,0);
@@ -2217,7 +2217,7 @@ static MACHINE_CONFIG_START( gondo, dec8_state )
 	MCFG_MACHINE_RESET(dec8)
 
 	/* video hardware */
-	MCFG_VIDEO_ATTRIBUTES(VIDEO_BUFFERS_SPRITERAM)
+	MCFG_VIDEO_ATTRIBUTES(VIDEO_BUFFERS_SPRITERAM | VIDEO_UPDATE_AFTER_VBLANK)
 
 	MCFG_DEVICE_ADD("spritegen", DECO_KARNOVSPRITES, 0)
 	deco_karnovsprites_device::set_gfx_region(*device, 1);