diff --git a/hash/rx78_cart.xml b/hash/rx78_cart.xml
index c9bc6922f2b..baa88047531 100644
--- a/hash/rx78_cart.xml
+++ b/hash/rx78_cart.xml
@@ -121,7 +121,7 @@ The monitor will expect you to load a program from cassette.
 		</part>
 	</software>
 
-	<software name="cracer" supported="partial"><!-- various bugs -->
+	<software name="cracer" supported="partial"><!-- traffic lights at start are skipped -->
 		<description>Champion Racer</description>
 		<year>1983</year>
 		<publisher>Bandai</publisher>
@@ -133,10 +133,11 @@ The monitor will expect you to load a program from cassette.
 		</part>
 	</software>
 
-	<software name="exbaseb" supported="no"><!-- gfx issues -->
+	<software name="exbaseb">
 		<description>Excite Baseball</description>
 		<year>1983</year>
 		<publisher>Bandai</publisher>
+		<info name="usage" value="Blue player uses arrows; Red player uses R,D,F,G" /><!-- difficult to hit the ball -->
 		<part name="cart" interface="rx78_cart">
 			<dataarea name="rom" size="32768">
 				<rom name="exbaseb1.bin" size="0x2000" crc="6237e902" sha1="0f7c236b9425508b3f22664ce7a5f10fc1b991b3" offset="0x4000" />
diff --git a/hash/super80_cass.xml b/hash/super80_cass.xml
index 974b2886fa0..d255430edf2 100644
--- a/hash/super80_cass.xml
+++ b/hash/super80_cass.xml
@@ -1649,7 +1649,7 @@ X-3607 : Horse Race
 	</software>
 	<software name="crazym">
 		<description>Crazy Maze</description>
-		<year>198?</year>
+		<year>1983</year>
 		<publisher>Matrix Software</publisher>
 		<info name="usage" value="L to load, G0 to run" />
 		<sharedfeat name="compatibility" value="D" />
@@ -1660,11 +1660,11 @@ X-3607 : Horse Race
 		</part>
 	</software>
 	<software name="crazymj">
-		<description>Crazy Maze (L4) (with arrows)</description>
-		<year>198?</year>
+		<description>Crazy Maze (with arrows)</description>
+		<year>1983</year>
 		<publisher>Matrix Software</publisher>
 		<info name="usage" value="T3 then, L to load, G0 to run" />
-		<sharedfeat name="compatibility" value="M" />
+		<sharedfeat name="compatibility" value="D,M" />
 		<part name="cass" interface="super80_cass">
 			<dataarea name="cass" size="0x1bfd20e">
 				<rom name="crazymj.wav" size="0x1bfd20e" crc="f723e58d" sha1="213a9dca5f58206cd415aa34eb4f0a70eb785c7b"/>
diff --git a/src/mame/drivers/meritum.cpp b/src/mame/drivers/meritum.cpp
index 2fa3ff09bf6..9edd68b9cb4 100644
--- a/src/mame/drivers/meritum.cpp
+++ b/src/mame/drivers/meritum.cpp
@@ -360,7 +360,7 @@ void meritum_state::meritum1(machine_config &config)
 	mainppi.out_pc_callback().set(FUNC(meritum_state::mainppi_portc_w));
 	mainppi.out_pb_callback().set(FUNC(meritum_state::mainppi_portb_w));
 
-/* parallel printer */
+	// printer
 	CENTRONICS(config, m_centronics, centronics_devices, "printer");
 	m_centronics->set_data_input_buffer("cent_data_in");
 	m_centronics->ack_handler().set("mainppi", FUNC(i8255_device::pc2_w));
diff --git a/src/mame/drivers/rx78.cpp b/src/mame/drivers/rx78.cpp
index 602a1a7d7fd..4a40e888860 100644
--- a/src/mame/drivers/rx78.cpp
+++ b/src/mame/drivers/rx78.cpp
@@ -116,7 +116,7 @@ private:
 	u8 m_pal_reg[7];
 	u8 m_pri_mask;
 	u8 m_key_mux;
-	u8 m_bgr;
+	u8 m_background;
 	std::unique_ptr<u8[]> m_vram;
 	required_device<cpu_device> m_maincpu;
 	required_device<cassette_image_device> m_cass;
@@ -164,12 +164,10 @@ uint32_t rx78_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap,
 				laycol[0] = 0;
 				laycol[1] = 0;
 				for (u8 j = 0; j < 6; j++)
-				{
-					bool bit = BIT(m_pal_reg[6], j);
 					if (BIT(layers, j))
-						laycol[bit] |= m_pal_reg[j];
-				}
-				u8 color = laycol[1] ? laycol[1] : (laycol[0] ? laycol[0] : m_bgr);
+						laycol[BIT(m_pal_reg[6], j)] |= m_pal_reg[j];
+
+				u8 color = laycol[1] ? laycol[1] : (laycol[0] ? laycol[0] : m_background);
 				bitmap.pix(y+bordery, x+i+borderx) = color;
 			}
 			count++;
@@ -230,17 +228,9 @@ void rx78_state::vram_write_bank_w(u8 data)
 void rx78_state::vdp_reg_w(offs_t offset, u8 data)
 {
 	if (offset < 6)
-	{
-		//u8 r = (data & 0x11) == 0x11 ? 0xff : ((data & 0x11) == 0x01 ? 0x7f : 0);
-		//u8 g = (data & 0x22) == 0x22 ? 0xff : ((data & 0x22) == 0x02 ? 0x7f : 0);
-		//u8 b = (data & 0x44) == 0x44 ? 0xff : ((data & 0x44) == 0x04 ? 0x7f : 0);
-		//m_palette->set_pen_color(66+offset, rgb_t(r,g,b));
 		m_pal_reg[offset] = bitswap<8>(data, 7, 3, 6, 2, 5, 1, 4, 0) & 0x3f;
-	}
 	else
-	{
 		m_pal_reg[offset] = data & 0x3f;
-	}
 }
 
 void rx78_state::vdp_bg_reg_w(u8 data)
@@ -249,7 +239,7 @@ void rx78_state::vdp_bg_reg_w(u8 data)
 	u8 g = (data & 0x22) == 0x22 ? 0xff : ((data & 0x22) == 0x02 ? 0x7f : 0);
 	u8 b = (data & 0x44) == 0x44 ? 0xff : ((data & 0x44) == 0x04 ? 0x7f : 0);
 	m_palette->set_pen_color(64, rgb_t(r,g,b));   // use this as the border colour
-	m_bgr = bitswap<8>(data, 7, 3, 6, 2, 5, 1, 4, 0) & 0x3f;
+	m_background = bitswap<8>(data, 7, 3, 6, 2, 5, 1, 4, 0) & 0x3f;
 }
 
 void rx78_state::vdp_pri_mask_w(u8 data)
@@ -446,7 +436,7 @@ void rx78_state::machine_start()
 	save_pointer(NAME(m_pal_reg), 7);
 	save_item(NAME(m_pri_mask));
 	save_item(NAME(m_key_mux));
-	save_item(NAME(m_bgr));
+	save_item(NAME(m_background));
 }
 
 DEVICE_IMAGE_LOAD_MEMBER( rx78_state::cart_load )