diff --git a/gamemanager.s b/gamemanager.s
index 87e6c95..f9e4bcf 100644
--- a/gamemanager.s
+++ b/gamemanager.s
@@ -58,7 +58,7 @@ gameplayLoop:
 ;	beq gameplayLoopKbd
 	BORDER_COLOR #$3
 	jsr renderTerrainSpans
-	jsr unrenderTerrainSpans
+;	jsr unrenderTerrainSpans
 
 	stz terrainDirty
 	BORDER_COLOR #$1
diff --git a/gscats.2mg b/gscats.2mg
index 9cf6c25..82c02ca 100644
Binary files a/gscats.2mg and b/gscats.2mg differ
diff --git a/terrain.s b/terrain.s
index dd6b7dd..e334aaf 100644
--- a/terrain.s
+++ b/terrain.s
@@ -11,6 +11,8 @@ COMPILEDTERRAINROW = TERRAINWIDTH/4+3	; In words, +2 to make room for clipping j
 VISIBLETERRAINWIDTH = TERRAINWIDTH/4	; In words- width minus jump return padding
 VISIBLETERRAINWINDOW = 80				; In words
 MAXSPANSPERROW = 15
+SPANROWBYTES = MAXSPANSPERROW*2 + 2		; In bytes
+
 
 .if 0
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -118,7 +120,7 @@ renderTerrainRowSpans:
 
 	; Find row data
 	lda PARAML1
-	asl		; Shifts must match MAXSPANSPERROW*2 + 2
+	asl		; Shifts must match SPANROWBYTES
 	asl
 	asl
 	asl
@@ -647,7 +649,7 @@ compileTerrainSpansRow:
 	SAVE_AXY
 
 	lda PARAML1
-	asl		; Shifts must match MAXSPANSPERROW*2 + 2
+	asl		; Shifts must match SPANROWBYTES
 	asl
 	asl
 	asl