diff --git a/OSBindings/Mac/Clock Signal/Atari2600.mm b/OSBindings/Mac/Clock Signal/Atari2600.mm
index 975341e68..e9acd17fc 100644
--- a/OSBindings/Mac/Clock Signal/Atari2600.mm	
+++ b/OSBindings/Mac/Clock Signal/Atari2600.mm	
@@ -26,36 +26,43 @@ struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
 }
 
 - (void)crtDidEndFrame:(Outputs::CRTFrame *)frame {
-	printf("\n\n===\n\n");
-	int c = 0;
-	for(int run = 0; run < frame->number_of_runs; run++)
-	{
-		char character = ' ';
-		switch(frame->runs[run].type)
+
+	dispatch_async(dispatch_get_main_queue(), ^{
+
+		printf("\n\n===\n\n");
+		int c = 0;
+		for(int run = 0; run < frame->number_of_runs; run++)
 		{
-			case Outputs::CRTRun::Type::Sync:	character = '<'; break;
-			case Outputs::CRTRun::Type::Level:	character = '_'; break;
-			case Outputs::CRTRun::Type::Data:	character = '-'; break;
-			case Outputs::CRTRun::Type::Blank:	character = ' '; break;
+			char character = ' ';
+			switch(frame->runs[run].type)
+			{
+				case Outputs::CRTRun::Type::Sync:	character = '<'; break;
+				case Outputs::CRTRun::Type::Level:	character = '_'; break;
+				case Outputs::CRTRun::Type::Data:	character = '-'; break;
+				case Outputs::CRTRun::Type::Blank:	character = ' '; break;
+			}
+
+			if(frame->runs[run].start_point.dst_x < 1.0 / 224.0)
+			{
+				printf("\n[%0.2f]: ", frame->runs[run].start_point.dst_y);
+				c++;
+			}
+
+			printf("(%0.2f): ", frame->runs[run].start_point.dst_x);
+			float length = fabsf(frame->runs[run].end_point.dst_x - frame->runs[run].start_point.dst_x);
+			int iLength = (int)(length * 64.0);
+			for(int c = 0; c < iLength; c++)
+			{
+				putc(character, stdout);
+			}
 		}
 
-		if(frame->runs[run].start_point.dst_x < 1.0 / 224.0)
-		{
-			printf("\n[%0.2f]: ", frame->runs[run].start_point.dst_y);
-			c++;
-		}
+		printf("\n\n[%d]\n\n", c);
 
-		printf("(%0.2f): ", frame->runs[run].start_point.dst_x);
-		float length = fabsf(frame->runs[run].end_point.dst_x - frame->runs[run].start_point.dst_x);
-		int iLength = (int)(length * 64.0);
-		for(int c = 0; c < iLength; c++)
-		{
-			putc(character, stdout);
-		}
-	}
-
-	printf("\n\n[%d]\n\n", c);
-	_atari2600.get_crt()->return_frame();
+		dispatch_async(_serialDispatchQueue, ^{
+			_atari2600.get_crt()->return_frame();
+		});
+	});
 }
 
 - (void)runForNumberOfCycles:(int)cycles {
@@ -76,7 +83,7 @@ struct Atari2600CRTDelegate: public Outputs::CRT::CRTDelegate {
 	if (self) {
 		_crtDelegate.atari = self;
 		_atari2600.get_crt()->set_delegate(&_crtDelegate);
-		_serialDispatchQueue = dispatch_queue_create("Atari 2600 quuue", DISPATCH_QUEUE_SERIAL);
+		_serialDispatchQueue = dispatch_queue_create("Atari 2600 queue", DISPATCH_QUEUE_SERIAL);
 	}
 
 	return self;