From 88ae860720cf97a1c6fc40eb551b27f89d5574f7 Mon Sep 17 00:00:00 2001
From: Mike Naberezny <mike@naberezny.com>
Date: Mon, 25 Jun 2018 17:03:26 -0700
Subject: [PATCH] Raise NotImplementedError when disassembling unknown mode

---
 py65/disassembler.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/py65/disassembler.py b/py65/disassembler.py
index 902c816..9b8caf8 100644
--- a/py65/disassembler.py
+++ b/py65/disassembler.py
@@ -127,4 +127,8 @@ class Disassembler:
             disasm += ' %s,Y' % address_or_label
             length = 2
 
+        else:
+            msg = "Addressing mode: %r" % addressing
+            raise NotImplementedError(msg)
+
         return (length, disasm)