From 173b40a809d54821e349aedda987b254592f8f9d Mon Sep 17 00:00:00 2001
From: Mike Naberezny <mike@naberezny.com>
Date: Mon, 9 Feb 2015 21:31:26 -0800
Subject: [PATCH] Fix ``py65mon --rom`` on Python 3.  Closes #28

---
 CHANGES.txt     | 2 ++
 py65/monitor.py | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CHANGES.txt b/CHANGES.txt
index 026978b..d7e0f2f 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,7 @@
 0.22 (Next Release)
 
+ - Fixed a bug where ``py65mon --rom`` would raise an exception
+   on Python 3.
 
 0.21 (2015-02-09)
 
diff --git a/py65/monitor.py b/py65/monitor.py
index 42d060b..e92193d 100644
--- a/py65/monitor.py
+++ b/py65/monitor.py
@@ -598,7 +598,9 @@ class Monitor(cmd.Cmd):
         if len(split) == 2:
             if split[1] == "top":
                 # load a ROM to top of memory
-                start = self.addrMask - len(bytes) / int(self.byteWidth / 8) + 1
+                top_address = self.addrMask
+                program_size = len(bytes) // (self.byteWidth // 8)
+                start = top_address - program_size + 1
             else:
                 start = self._address_parser.number(split[1])
         else: