diff --git a/common/Makefile b/common/Makefile
index 689893c..19231b6 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -4,11 +4,11 @@ system.obj: common.obj page6.obj
 	cat common.obj page6.obj > system.obj
 
 common.obj: rom.h common.h common.asm
-	xa -M common.asm -l common.lbl -o common.obj
+	xa -C -M common.asm -l common.lbl -o common.obj
 
 page6.obj: rom.h macros.h page6.src
 	cpp -P page6.src | $(XAPP) > page6.asm
-	xa -M page6.asm -l page6.lbl -o page6.obj
+	xa -C -M page6.asm -l page6.lbl -o page6.obj
 
 clean:
 	rm -f page6.asm common.obj page6.obj common.lbl page6.lbl system.obj
diff --git a/common/page6.src b/common/page6.src
index c6235af..e7a2d60 100644
--- a/common/page6.src
+++ b/common/page6.src
@@ -5,10 +5,10 @@
 
 HDR(DEMO)
 	CMN
-	SET(R0, 1048575)
+	SET(R0, 1048575.999)
 	SET(R1, 3 * 5 * 5)
 	MOD(R2, R0, R1)
-	;SUB(R3, R0, R2)
+	SUB(R3, R0, R2)
 	ESC
 	BRK