2 files changed, 11 insertions, 5 deletions
diff --git a/src/util.c b/src/util.c
index 566255d..8ce2822 100644
--- a/src/util.c
+++ b/src/util.c
@@ -111,13 +111,21 @@ const char *Dirname(const char *path)
 
 void Debug(const char *format, ...)
 {
+    static const int USE_STDERR=1;
     static FILE *fp=NULL;
     va_list ap;
 
     if (!fp)
     {
-    	fp=fopen("debug.txt","w");
-	setbuf(fp,NULL);
+	if (USE_STDERR)
+	{
+	    fp=stderr;
+	}
+	else
+	{
+	    fp=fopen("debug.txt","w");
+	    setbuf(fp,NULL);
+	}
     }
 
     if (!fp)
diff --git a/src/zx81.c b/src/zx81.c
index 87158cd..efaef52 100644
--- a/src/zx81.c
+++ b/src/zx81.c
@@ -52,9 +52,7 @@ static const int	ROMLEN=0x2000;
 static const int	ROM_SAVE=0x2fc;
 static const int	ROM_LOAD=0x347;
 
-/* No of T-states in each 64us HSYNC (hopefully)
-*/
-static const Z80Val	HSYNC_PERIOD=321;
+static const Z80Val	HSYNC_PERIOD=208;
 
 /* The ZX81 screen
 */