diff --git a/hash/odyssey2.xml b/hash/odyssey2.xml
index fc15a63d59a..080a1fe7469 100644
--- a/hash/odyssey2.xml
+++ b/hash/odyssey2.xml
@@ -1356,7 +1356,7 @@ The C7010 Chess Module had a NSC800 CMOS microprocessor, with 2K RAM and 8K ROM.
 		</part>
 	</software>
 
-	<software name="qbert" supported="partial">
+	<software name="qbert">
 		<description>Q*bert (Euro)</description>
 		<year>1983</year>
 		<publisher>Parker Brothers</publisher>
@@ -1707,7 +1707,7 @@ The C7010 Chess Module had a NSC800 CMOS microprocessor, with 2K RAM and 8K ROM.
 		</part>
 	</software>
 
-	<software name="turtles">
+	<software name="turtles" supported="partial">
 		<description>Turtles (Euro)</description>
 		<year>1982</year>
 		<publisher>Philips</publisher>
@@ -1721,7 +1721,7 @@ The C7010 Chess Module had a NSC800 CMOS microprocessor, with 2K RAM and 8K ROM.
 		</part>
 	</software>
 
-	<software name="turtlesu" cloneof="turtles">
+	<software name="turtlesu" cloneof="turtles" supported="partial">
 		<description>Turtles (USA)</description>
 		<year>1983</year>
 		<publisher>Philips</publisher>
diff --git a/src/devices/video/i8244.cpp b/src/devices/video/i8244.cpp
index 72c59bfb587..71220095e2a 100644
--- a/src/devices/video/i8244.cpp
+++ b/src/devices/video/i8244.cpp
@@ -280,14 +280,14 @@ int i8244_device::get_x_beam()
 
 offs_t i8244_device::fix_register_mirrors( offs_t offset )
 {
-	// registers $40,$41 are mirrored at $44,$45, $48,$49, and $4C,$4D
-	if ( ( offset & 0xF2 ) == 0x40 )
+	// quad x/y registers are mirrored for each quad
+	if ( ( offset & 0xC2 ) == 0x40 )
 	{
 		offset &= ~0x0C;
 	}
 
 	// registers $A0-$AF are mirrored at $B0-$BF
-	if ( ( offset & 0xF0 ) == 0xB0 )
+	if ( ( offset & 0xE0 ) == 0xA0 )
 	{
 		offset &= ~0x10;
 	}
@@ -556,14 +556,14 @@ void i8244_device::render_scanline(int vpos)
 			/* Quad objects */
 			for ( int i = 0; i < ARRAY_LENGTH( m_vdc.s.quad ); i++ )
 			{
-				int y = m_vdc.s.quad[i].single[0].y;
+				int y = m_vdc.s.quad[i].single[0].y & 0xFE;
 				int height = 8;
 
 				if ( y <= scanline && scanline < y + height * 2 )
 				{
 					int x = m_vdc.s.quad[i].single[0].x;
 
-					// Charaecter height is always determined by the height of the 4th character
+					// Character height is always determined by the height of the 4th character
 					int char_height = 8 - ( ( ( y >> 1 ) + m_vdc.s.quad[i].single[3].ptr ) & 7 );
 
 					for ( int j = 0; j < ARRAY_LENGTH( m_vdc.s.quad[0].single ); j++, x += 8 )
diff --git a/src/mame/drivers/odyssey2.cpp b/src/mame/drivers/odyssey2.cpp
index bf779a38092..f2a3ae2aefb 100644
--- a/src/mame/drivers/odyssey2.cpp
+++ b/src/mame/drivers/odyssey2.cpp
@@ -7,9 +7,8 @@ Driver file to handle emulation of the Odyssey2.
 TODO:
 - odyssey3 cpu/video should have different clocks
 - backgamm does not work, it only shows the background graphics
-- chess has graphics issues near the screen borders: missing A-H at bottom,
-  rightmost column is not erased properly, wrongly places chars at top
-- qbert has major graphics problems, similar to chess?
+- chess is missing some graphics: half of the statusbar chars at the top,
+  and the A-H row at the bottom
 - missing questionmark graphics in turtles
 - homecomp does not work, needs new slot device
 - g7400 EF9341 R/W is connected to CPU A2, what happens if it is disobeyed?