diff --git a/joeylib/src/jIIgs.asm b/joeylib/src/jIIgs.asm
index d3a5a1a..ae642c2 100644
--- a/joeylib/src/jIIgs.asm
+++ b/joeylib/src/jIIgs.asm
@@ -382,15 +382,15 @@ loopY	equ	9
 
 drawTop	phy		; Keep Y for later
 	ldy	offset	; Y is now offset into map data
-	lda	[<mapData],y
-	and	#$ff00	; We only want 8 bits
+	lda	[mapData],y
+	and	#$00ff	; We only want 8 bits
 	sta	tileX
 	iny
-	lda	[<mapData],y
-	and	#$ff00	; We only want 8 bits
+	lda	[mapData],y
+	and	#$00ff	; We only want 8 bits
 	sta	tileY
 	iny
-	sta	offset
+	sty	offset
 	ply		; Y is our loop counter again
 
 	phx		; Protect from clobbering