From beb25c09c87c67e83f05f89fe704890493aac263 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Fri, 6 May 2016 08:38:10 +0100
Subject: Fixed SNES checksum.

---
 src/snesout.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/snesout.c b/src/snesout.c
index 911ee49..c8b0bac 100644
--- a/src/snesout.c
+++ b/src/snesout.c
@@ -290,13 +290,15 @@ int SNESOutput(const char *filename, const char *filename_bank,
     */
     csum = 0;
 
+    PokeW(mem, 0xffdc, 0xffff);
+
     for(f = 0; f < count; f++)
     {
         csum = CalcChecksum(bank[f]->memory + base, len, csum);
     }
 
     PokeW(mem, 0xffde, csum);
-    PokeW(mem, 0xffdc, 0xffffu - csum);
+    PokeW(mem, 0xffdc, csum ^ 0xffff);
 
     /* Output ROM contents
     */
-- 
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