diff --git a/mandel.s b/mandel.s
index b8985b3..9546b68 100644
--- a/mandel.s
+++ b/mandel.s
@@ -290,18 +290,21 @@ viewport_zoom:
     .byte 6
     .byte 8
     .byte 6
+    .byte 8
 
 viewport_ox:
     .dword $00000000
     .dword $ff110000
     .dword $ff110000
     .dword $fe400000
+    .dword $fe3b0000
 
 viewport_oy:
     .dword $00000000
     .dword $ffb60000
     .dword $ffbe0000
     .dword $00000000
+    .dword $fffe0000
 
 ; 2 + 9 * byte cycles
 .macro add bytes, dest, arg1, arg2
@@ -1399,6 +1402,8 @@ number_keys:
     beq three
     cpy #KEY_4
     beq four
+    cpy #KEY_5
+    beq five
     jmp skip_char
 
 one:
@@ -1412,6 +1417,9 @@ three:
     jmp load_key_viewport
 four:
     ldx #3
+    jmp load_key_viewport
+five:
+    ldx #4
     ; fall through
 load_key_viewport:
     jsr load_viewport