diff --git a/src/devices/video/jangou_blitter.cpp b/src/devices/video/jangou_blitter.cpp
index 07953576a45..8b0ff953ff8 100644
--- a/src/devices/video/jangou_blitter.cpp
+++ b/src/devices/video/jangou_blitter.cpp
@@ -166,3 +166,9 @@ WRITE8_MEMBER( jangou_blitter_device::blitter_vregs_w)
 	m_pen_data[offset] = data & 0xf;
 }
 
+WRITE8_MEMBER( jangou_blitter_device::blitter_bltflip_w)
+{
+	// TODO: this flips gfx nibbles.
+	
+}
+
diff --git a/src/devices/video/jangou_blitter.h b/src/devices/video/jangou_blitter.h
index a8a4934a475..c0c5dff30ca 100644
--- a/src/devices/video/jangou_blitter.h
+++ b/src/devices/video/jangou_blitter.h
@@ -36,6 +36,7 @@ public:
 	DECLARE_WRITE8_MEMBER( blitter_process_w );
 	DECLARE_WRITE8_MEMBER( blitter_alt_process_w );
 	DECLARE_WRITE8_MEMBER( blitter_vregs_w );
+	DECLARE_WRITE8_MEMBER( blitter_bltflip_w );
 	UINT8        m_blit_buffer[256 * 256];
 
 protected:
diff --git a/src/mame/drivers/nightgal.cpp b/src/mame/drivers/nightgal.cpp
index 736059fbc05..ab3e73a941c 100644
--- a/src/mame/drivers/nightgal.cpp
+++ b/src/mame/drivers/nightgal.cpp
@@ -420,7 +420,7 @@ static ADDRESS_MAP_START( sexygal_nsc_map, AS_PROGRAM, 8, nightgal_state )
 	AM_RANGE(0x0081, 0x0083) AM_READ(royalqn_nsc_blit_r)
 	AM_RANGE(0x0080, 0x0086) AM_DEVWRITE("blitter", jangou_blitter_device, blitter_alt_process_w)
 	AM_RANGE(0x00a0, 0x00af) AM_DEVWRITE("blitter", jangou_blitter_device, blitter_vregs_w)
-	AM_RANGE(0x00b0, 0x00b0) AM_WRITENOP // bltflip register
+	AM_RANGE(0x00b0, 0x00b0) AM_DEVWRITE("blitter", jangou_blitter_device, blitter_bltflip_w) 
 
 	AM_RANGE(0x1000, 0x13ff) AM_MIRROR(0x2c00) AM_READWRITE(royalqn_comm_r, royalqn_comm_w) AM_SHARE("comms_ram")
 	AM_RANGE(0xc000, 0xdfff) AM_MIRROR(0x2000) AM_ROM AM_REGION("subrom", 0)
@@ -453,14 +453,13 @@ static ADDRESS_MAP_START( royalqn_io, AS_IO, 8, nightgal_state )
 ADDRESS_MAP_END
 
 static ADDRESS_MAP_START( royalqn_nsc_map, AS_PROGRAM, 8, nightgal_state )
-	AM_RANGE(0x0000, 0x007f) AM_RAM AM_SHARE("xx")
+	AM_RANGE(0x0000, 0x007f) AM_RAM
 	AM_RANGE(0x0080, 0x0080) AM_READ(blitter_status_r)
 	AM_RANGE(0x0081, 0x0083) AM_READ(royalqn_nsc_blit_r)
 	AM_RANGE(0x0080, 0x0086) AM_DEVWRITE("blitter", jangou_blitter_device, blitter_process_w)
 	AM_RANGE(0x00a0, 0x00af) AM_DEVWRITE("blitter", jangou_blitter_device, blitter_vregs_w)
-	AM_RANGE(0x00b0, 0x00b0) AM_WRITENOP // bltflip register
+	AM_RANGE(0x00b0, 0x00b0) AM_DEVWRITE("blitter", jangou_blitter_device, blitter_bltflip_w) 
 
-	AM_RANGE(0x1000, 0x1007) AM_RAM AM_SHARE("xx")
 	AM_RANGE(0x1000, 0x13ff) AM_MIRROR(0x2c00) AM_READWRITE(royalqn_comm_r,royalqn_comm_w)
 	AM_RANGE(0x4000, 0x4000) AM_NOP
 	AM_RANGE(0x8000, 0x8000) AM_NOP //open bus or protection check