From b6080e1701a93bcf224b503873e7133bdc5e8373 Mon Sep 17 00:00:00 2001
From: thrust26 <tjentzsch@yahoo.de>
Date: Sat, 16 Dec 2017 10:54:45 +0100
Subject: [PATCH] fixed #270

---
 src/debugger/Debugger.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/debugger/Debugger.cxx b/src/debugger/Debugger.cxx
index 1f4a5c16a..58efb4265 100644
--- a/src/debugger/Debugger.cxx
+++ b/src/debugger/Debugger.cxx
@@ -530,7 +530,7 @@ uInt16 Debugger::windStates(uInt16 numStates, bool unwind, string& message)
 {
   RewindManager& r = myOSystem.state().rewindManager();
 
-  mySystem.clearDirtyPages();
+  saveOldState();
 
   unlockBankswitchState();
 
@@ -617,6 +617,7 @@ void Debugger::setStartState()
   // Save initial state and add it to the rewind list (except when in currently rewinding)
   RewindManager& r = myOSystem.state().rewindManager();
   saveOldState(false);
+  // avoid invalidating future states when entering the debugger during rewind
   if (r.atLast())
     addState("enter debugger");