diff --git a/grafproc.asm b/grafproc.asm
index f65bbb8..4c00c73 100755
--- a/grafproc.asm
+++ b/grafproc.asm
@@ -1466,9 +1466,9 @@ GetLower4bits
 
 ;---
     ldy xbyte
-    lda ydraw ; y = y - 7 because left lower. shouldn't it be 8?
+    lda ydraw ; y = y - 3 because left lower.
     sec
-    sbc #7
+    sbc #3
     tax
 
     lda linetableL,x
diff --git a/scorch.xex b/scorch.xex
index 8fc802d..9b71990 100644
Binary files a/scorch.xex and b/scorch.xex differ