From f4f869a2cb22041af648bd678bf114876c81d03b Mon Sep 17 00:00:00 2001
From: Peter Veenstra <qbix79@users.sourceforge.net>
Date: Sun, 6 Jun 2004 19:37:38 +0000
Subject: [PATCH] Don't allow backcounts to get below zero (acces violations).
 Fixes melee mode of starcon2 with gus enabled

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1810
---
 src/hardware/gus.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/hardware/gus.cpp b/src/hardware/gus.cpp
index 9c319651..61672a97 100644
--- a/src/hardware/gus.cpp
+++ b/src/hardware/gus.cpp
@@ -364,9 +364,9 @@ public:
 			
 
 			if(dir) {
-				// Increment backwards
-				if (moving) CurAddr -= RealDelta;
-
+				// Increment backwards but don't let it get below zero.
+				if (moving) { if(CurAddr > RealDelta) CurAddr -= RealDelta; else CurAddr = 0; }
+			   
 				//Thought 16-bit needed this
 				//if ((!eightbit) && (moving)) CurAddr -= RealDelta;