diff --git a/mandel.s b/mandel.s
index 04edec5..fe86366 100644
--- a/mandel.s
+++ b/mandel.s
@@ -1341,12 +1341,15 @@ skip_luma:
     cpy #KEY_MINUS
     beq minus
 
-    ; temp = $0010 << (8 - zoom)
-    lda #$10
-    sta temp
+    ; temp+temp2 = $00010000 << (8 - zoom)
     lda #$00
+    sta temp
     sta temp + 1
-    scale_zoom temp
+    lda #$01
+    sta temp + 2
+    lda #$00
+    sta temp + 3
+    scale_zoom temp + 2
 
     cpy #KEY_UP
     beq up
@@ -1356,14 +1359,7 @@ skip_luma:
     beq left
     cpy #KEY_RIGHT
     beq right
-    cpy #KEY_1
-    beq one
-    cpy #KEY_2
-    beq two
-    cpy #KEY_3
-    beq three
-    cpy #KEY_4
-    beq four
+    jmp number_keys
  
 skip_char:
     lda #0
@@ -1382,17 +1378,28 @@ minus:
     dec zoom
     jmp done
 up:
-    sub16 oy, oy, temp 
+    sub32 oy, oy, temp
     jmp done
 down:
-    add16 oy, oy, temp
+    add32 oy, oy, temp
     jmp done
 left:
-    sub16 ox, ox, temp
+    sub32 ox, ox, temp
     jmp done
 right:
-    add16 ox, ox, temp
+    add32 ox, ox, temp
     jmp done
+
+number_keys:
+    cpy #KEY_1
+    beq one
+    cpy #KEY_2
+    beq two
+    cpy #KEY_3
+    beq three
+    cpy #KEY_4
+    beq four
+
 one:
     ldx #0
     jmp load_key_viewport