diff --git a/assembler.c b/assembler.c
index 9482f38..14af8ff 100644
--- a/assembler.c
+++ b/assembler.c
@@ -169,7 +169,7 @@ pass1(FILE *f)
 			case '#': addr += 4; break;
 			case '.': addr += 2; break;
 			case ',':
-				addr += (slen(w + 1) == 2 ? 1 : 2);
+				addr += (sihx(w + 1) && slen(w + 1) == 2 ? 1 : 2);
 				addr += (sihx(w + 1) ? slen(w + 1) / 2 : 2);
 				break;
 			default: return error("Unknown label", w);
diff --git a/build.sh b/build.sh
index 7021d29..fe00044 100755
--- a/build.sh
+++ b/build.sh
@@ -24,5 +24,5 @@ rm -f ./bin/emulator
 cc -std=c89 -DDEBUG -Wall -Wno-unknown-pragmas -Wpedantic -Wshadow -Wextra -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion -Wvla -g -Og -fsanitize=address -fsanitize=undefined uxn.c emulator.c -L/usr/local/lib -lSDL2 -o bin/emulator
 
 # run
-./bin/assembler examples/mouse.usm bin/boot.rom
+./bin/assembler examples/test.usm bin/boot.rom
 ./bin/emulator bin/boot.rom
diff --git a/examples/hello.usm b/examples/hello.usm
index 6739817..6ca78b5 100644
--- a/examples/hello.usm
+++ b/examples/hello.usm
@@ -7,7 +7,7 @@
 @word1 "hello_world ( len: 0x0b )
 
 @loop
-	,00 IOW ( write to device#0 )
+	IOW ( write to device#0 )
 	,incr JSR ( increment itr )
 	,word1 ,strlen JSR ( get strlen )
 	NEQ ,loop ROT JSR? ( loop != strlen )
diff --git a/examples/test.usm b/examples/test.usm
index 2c82c86..f5918f7 100644
--- a/examples/test.usm
+++ b/examples/test.usm
@@ -3,35 +3,26 @@
 :dev/r fff8 ( std read port )
 :dev/w fff9 ( std write port )
 
+;i ;x0 ;x1 ;y0 ;y1
+
 |0100 @RESET 
 	
-	,02 ,dev/r STR ( set dev/read mouse#02 )
-	,01 ,dev/w STR ( set dev/write screen#01 )
-
-	,00 ,01 ,0001 ,0000 ,putpixel JSR
-	,00 ,01 ,0000 ,0001 ,putpixel JSR
-	,00 ,01 ,0002 ,0001 ,putpixel JSR
-	,01 ,02 ,0001 ,0002 ,putpixel JSR
+	,01 ,dev/w STR ( set dev/write screen#01 ) 
 
 BRK
 
-|c000 @FRAME
+|c000 @FRAME 
+	
+	,i LDR ,01 ADD ,i STR ( incr i )
 
-	( get mouse button, or break )
-	,04 IOR
-	,01 NEQ
-	BRK?
-		
-	( paint a white pixel )
-	,01 ,01 
-	,getmouse JSR
-	,putpixel JSR
+	,i LDR ,x1 STR ( set x )
+
+	,01 ,02 ,x0 LDR^ ,y0 LDR^ ,putpixel JSR
 
 BRK
 
-@getmouse
-	,02 IOR^ ( get mouse y )
-	,00 IOR^ ( get mouse x )
+@onrow
+	,y1 LDR ,01 ADD ,y1 STR
 	RTS
 
 @putpixel 
diff --git a/uxn.c b/uxn.c
index 4ff5f47..44b31eb 100644
--- a/uxn.c
+++ b/uxn.c
@@ -157,6 +157,7 @@ stepuxn(Uxn *u, Uint8 instr)
 int
 evaluxn(Uxn *u, Uint16 vec)
 {
+	u->literal = 0;
 	u->ram.ptr = vec;
 	setflag(&u->status, FLAG_HALT, 0);
 	while(!(u->status & FLAG_HALT)) {