diff --git a/build.sh b/build.sh
index 86f72df..63d5aa3 100755
--- a/build.sh
+++ b/build.sh
@@ -20,5 +20,5 @@ cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werr
 # cc uxn.c emulator.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -L/usr/local/lib -lSDL2 -o bin/emulator
 
 # run
-./bin/assembler examples/devchord.usm bin/boot.rom
+./bin/assembler examples/images.usm bin/boot.rom
 ./bin/emulator bin/boot.rom
diff --git a/emulator.c b/emulator.c
index 4418011..b0597c1 100644
--- a/emulator.c
+++ b/emulator.c
@@ -196,7 +196,7 @@ drawdebugger(Uint32 *dst, Uxn *u)
 		Uint8 x = (i % 8) * 3 + 3, y = i / 8 + 3, b = u->ram.dat[i];
 		drawicn(dst, x * 8, y * 8, icons[(b >> 4) & 0xf], 1, 0);
 		drawicn(dst, x * 8 + 8, y * 8, icons[b & 0xf], 1, 0);
-		y = VER - i / 8, b = u->wst.dat[i];
+		y = VER - 1 + i / 8, b = u->wst.dat[i];
 		drawicn(dst, x * 8, y * 8, icons[(b >> 4) & 0xf], 1 + (u->wst.ptr == i), 0);
 		drawicn(dst, x * 8 + 8, y * 8, icons[b & 0xf], 1 + (u->wst.ptr == i), 0);
 	}
diff --git a/examples/devmousedrag.usm b/examples/devmousedrag.usm
deleted file mode 100644
index 9945bd3..0000000
--- a/examples/devmousedrag.usm
+++ /dev/null
@@ -1,112 +0,0 @@
-( drag )
-
-:dev/r fff8 ( std read port )
-:dev/w fff9 ( std write port )
-
-;dragx 2  ;dragy 2
-;mousex 2 ;mousey 2 
-;lastx 2  ;lasty 2 
-;originx 2 ;originy 2 
-;down 1 ;state 1
-
-|0100 @RESET 
-	
-	#05 =dev/r ( set dev/read mouse )
-	#02 =dev/w ( set dev/write to sprite ) 
-	,draw-picture JSR
-
-BRK
-
-|c000 @FRAME
-
-	( clear last cursor )
-	#10 ,clear_icn ~lastx ~lasty ,draw-sprite JSR
-	( record mouse values )
-	#00 IOR2 =mousex #02 IOR2 =mousey
-	#04 IOR #11 ADD =state
-	( draw mouse )
-	~state ,cursor_icn ~mousex ~mousey ,draw-sprite JSR
-	( update last pos )
-	~mousex =lastx ~mousey =lasty 
-
-	( get touch )
-	#05 IOR #01 EQU ,on-touch ROT JMP? POP2
-	#05 IOR #10 EQU ,on-release ROT JMP? POP2
-	#01 ~down EQU ,on-drag ROT JMP? POP2
-
-	BRK
-
-	@on-touch
-		#01 =down
-		#00 IOR2 =originx #02 IOR2 =originy
-		,update JSR
-	BRK
-
-	@on-release
-		#00 =down
-		,update JSR
-	BRK
-
-	@on-drag
-		#00 IOR2 ~originx SUBS2 ~dragx ADDS2 =dragx
-		#02 IOR2 ~originy SUBS2 ~dragy ADDS2 =dragy
-		#00 IOR2 =originx #02 IOR2 =originy
-		,update JSR
-	BRK
-
-	@update
-		,draw-picture JSR
-
-BRK
-
-@draw-picture
-	#01 ,graphic #0040 ~dragx ADD2 #0040 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0008 ADD2 #0048 ~dragx ADD2 #0040 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0010 ADD2 #0050 ~dragx ADD2 #0040 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0018 ADD2 #0058 ~dragx ADD2 #0040 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0020 ADD2 #0040 ~dragx ADD2 #0048 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0028 ADD2 #0048 ~dragx ADD2 #0048 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0030 ADD2 #0050 ~dragx ADD2 #0048 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0038 ADD2 #0058 ~dragx ADD2 #0048 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0040 ADD2 #0040 ~dragx ADD2 #0050 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0048 ADD2 #0048 ~dragx ADD2 #0050 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0050 ADD2 #0050 ~dragx ADD2 #0050 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0058 ADD2 #0058 ~dragx ADD2 #0050 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0060 ADD2 #0040 ~dragx ADD2 #0058 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0068 ADD2 #0048 ~dragx ADD2 #0058 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0070 ADD2 #0050 ~dragx ADD2 #0058 ~dragy ADD2 ,draw-sprite JSR
-	#01 ,graphic #0078 ADD2 #0058 ~dragx ADD2 #0058 ~dragy ADD2 ,draw-sprite JSR
-	RTS
-
-@draw-sprite
-	IOW2 ( y byte )
-	IOW2 ( x byte )
-	IOW2 ( sprite address )
-	IOW ( layer-color )
-	RTS
-
-@clear_icn   [ 0000 0000 0000 0000 ]
-@cursor_icn  [ 80c0 e0f0 f8e0 1000 ]
-
-@graphic [
-	ff80 8080 8080 8088
-	ffff fffc f8f9 f1f4
-	ffff 0010 c721 2120
-	ffff 3f0f 0717 c343
-	8888 8080 8080 8080
-	f0f1 f2f5 f2f1 f0f4
-	1208 804c 9212 4c00
-	7303 0343 1b1b fbfb
-	8080 8f83 8383 8393
-	f0f3 f1f0 e4c0 80ff
-	00c7 c7c6 4606 00ff
-	c3d3 c307 870f 3fff
-	8f83 8383 8383 83ff
-	fff7 fdff c0e2 f1ff
-	7fef bfff 07af 5fff
-	ffff ffff ffff ffff
-]
-
-|d000 @ERROR BRK 
-|FFF0 [ f0ac f0bb f053 ] ( palette )
-|FFFA .RESET .FRAME .ERROR ( vectors )
diff --git a/examples/images.usm b/examples/images.usm
new file mode 100644
index 0000000..784b0ca
--- /dev/null
+++ b/examples/images.usm
@@ -0,0 +1,87 @@
+( drag )
+
+:dev/r fff8 ( std read port )
+:dev/w fff9 ( std write port )
+
+&Point { x 1 y 1 }
+
+&Point2d { x 2 y 2 }
+&Picture2d { x 2 y 2 width 1 height 1 color 1 addr 2 }
+
+;pict Picture2d ;pictpt Point
+
+|0100 @RESET 
+	
+	#05 =dev/r ( set dev/read mouse )
+	#02 =dev/w ( set dev/write to sprite ) 
+
+	#0030 #0042 #04 #04 #01 ,graphic ,draw-picture JSR
+	#0040 #0052 #04 #04 #02 ,graphic ,draw-picture JSR
+	#0050 #0062 #04 #04 #03 ,graphic ,draw-picture JSR
+
+	#0058 #0042 #04 #04 #05 ,graphic ,draw-picture JSR
+	#0068 #0052 #04 #04 #06 ,graphic ,draw-picture JSR
+	#0078 #0062 #04 #04 #07 ,graphic ,draw-picture JSR
+
+	#0080 #0042 #04 #04 #0a ,graphic ,draw-picture JSR
+	#0090 #0052 #04 #04 #0c ,graphic ,draw-picture JSR
+	#00a0 #0062 #04 #04 #0e ,graphic ,draw-picture JSR
+
+BRK
+
+@draw-picture ( x y width height addr -> picture ) 
+
+	=pict.addr =pict.color =pict.height =pict.width =pict.y =pict.x
+	#00 =pictpt.y
+	@draw-picture-row
+		#00 =pictpt.x
+		@draw-picture-col
+			( draw )
+			~pict.color 
+			~pict.addr 
+			#0008 #00 ~pictpt.x MUL2 ADD2 ( x )
+			#0008 #00 ~pictpt.y ~pict.width MUL MUL2 ADD2 ( y * width )
+			~pict.x #0008 #00 ~pictpt.x MUL2 ADD2
+			~pict.y #0008 #00 ~pictpt.y MUL2 ADD2
+			,draw-sprite JSR
+			( draw - end )
+			( incr x ) ~pictpt.x #01 ADD =pictpt.x
+			~pictpt.x ~pict.width LTH ,draw-picture-col ROT JMP? POP2
+		( incr y ) ~pictpt.y #01 ADD =pictpt.y
+		~pictpt.y ~pict.height LTH ,draw-picture-row ROT JMP? POP2
+		
+RTS
+
+@draw-sprite
+	IOW2 ( y byte )
+	IOW2 ( x byte )
+	IOW2 ( sprite address )
+	IOW ( layer-color )
+	RTS
+
+@clear_icn   [ 0000 0000 0000 0000 ]
+@cursor_icn  [ 80c0 e0f0 f8e0 1000 ]
+
+@graphic [
+	ff80 8080 8080 8088
+	ffff fffc f8f9 f1f4
+	ffff 0010 c721 2120
+	ffff 3f0f 0717 c343
+	8888 8080 8080 8080
+	f0f1 f2f5 f2f1 f0f4
+	1208 804c 9212 4c00
+	7303 0343 1b1b fbfb
+	8080 8f83 8383 8393
+	f0f3 f1f0 e4c0 80ff
+	00c7 c7c6 4606 00ff
+	c3d3 c307 870f 3fff
+	8f83 8383 8383 83ff
+	fff7 fdff c0e2 f1ff
+	7fef bfff 07af 5fff
+	ffff ffff ffff ffff
+]
+
+|c000 @FRAME BRK
+|d000 @ERROR BRK 
+|FFF0 [ f0ac f0bb f053 ] ( palette )
+|FFFA .RESET .FRAME .ERROR ( vectors )
diff --git a/uxn.c b/uxn.c
index 93475bb..9c9c452 100644
--- a/uxn.c
+++ b/uxn.c
@@ -108,7 +108,7 @@ Uint8 opr[][2] = {
 	{1,0}, {1,2}, {2,2}, {2,3}, {3,3}, {1,0}, {0,1}, {2,1},
 	{2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1}, {2,1},
 	/* 16-bit */
-	{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, /* TODO */
+	{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {2,2}, {4,0}, /* TODO */
 	{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {0,0}, /* TODO */
 	{0,0}, {0,0}, {0,0}, {0,0}, {0,0}, {1,0}, {0,1}, {0,0}, /* TODO */
 	{4,2}, {4,2}, {4,2}, {4,2}, {4,2}, {4,2}, {4,2}, {4,2}