From 0d1481cb9d3416e3cb0783f55d70af7fc23b7623 Mon Sep 17 00:00:00 2001
From: Stephen Anthony <sa666666@gmail.com>
Date: Tue, 11 Jul 2017 17:18:56 -0230
Subject: [PATCH] Revert behaviour of TIA read from write-only addresses to
 match Stella 4.x (fixes #173).

---
 src/emucore/tia/TIA.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/emucore/tia/TIA.cxx b/src/emucore/tia/TIA.cxx
index 0b6303a98..90cc326f3 100644
--- a/src/emucore/tia/TIA.cxx
+++ b/src/emucore/tia/TIA.cxx
@@ -412,7 +412,7 @@ uInt8 TIA::peek(uInt16 address)
       break;
 
     default:
-      result = lastDataBusValue;
+      result = 0;
   }
 
   return (result & 0xC0) | (lastDataBusValue & 0x3F);