diff --git a/OSBindings/Mac/Clock Signal/Base.lproj/Vic20Document.xib b/OSBindings/Mac/Clock Signal/Base.lproj/Vic20Document.xib
new file mode 100644
index 000000000..e1f140fda
--- /dev/null
+++ b/OSBindings/Mac/Clock Signal/Base.lproj/Vic20Document.xib	
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="9532" systemVersion="15F34" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="9532"/>
+    </dependencies>
+    <objects>
+        <customObject id="-2" userLabel="File's Owner" customClass="Atari2600Document" customModule="Clock_Signal" customModuleProvider="target">
+            <connections>
+                <outlet property="openGLView" destination="DEG-fq-cjd" id="Gxs-2u-n7B"/>
+                <outlet property="window" destination="xOd-HO-29H" id="JIz-fz-R2o"/>
+            </connections>
+        </customObject>
+        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
+        <window title="Window" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" oneShot="NO" releasedWhenClosed="NO" showsToolbarButton="NO" visibleAtLaunch="NO" animationBehavior="default" id="xOd-HO-29H" userLabel="Window">
+            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
+            <windowCollectionBehavior key="collectionBehavior" fullScreenPrimary="YES"/>
+            <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
+            <rect key="contentRect" x="133" y="235" width="400" height="300"/>
+            <rect key="screenRect" x="0.0" y="0.0" width="1366" height="768"/>
+            <value key="minSize" type="size" width="228" height="171"/>
+            <view key="contentView" id="gIp-Ho-8D9">
+                <rect key="frame" x="0.0" y="0.0" width="400" height="300"/>
+                <autoresizingMask key="autoresizingMask"/>
+                <subviews>
+                    <openGLView useAuxiliaryDepthBufferStencil="NO" allowOffline="YES" wantsBestResolutionOpenGLSurface="YES" translatesAutoresizingMaskIntoConstraints="NO" id="DEG-fq-cjd" customClass="CSOpenGLView">
+                        <rect key="frame" x="0.0" y="0.0" width="400" height="300"/>
+                    </openGLView>
+                </subviews>
+                <constraints>
+                    <constraint firstItem="DEG-fq-cjd" firstAttribute="centerX" secondItem="gIp-Ho-8D9" secondAttribute="centerX" id="ES5-nL-N3h"/>
+                    <constraint firstItem="DEG-fq-cjd" firstAttribute="height" secondItem="gIp-Ho-8D9" secondAttribute="height" id="YoB-qI-LFX"/>
+                    <constraint firstItem="DEG-fq-cjd" firstAttribute="centerY" secondItem="gIp-Ho-8D9" secondAttribute="centerY" id="d5Y-3a-CEI"/>
+                    <constraint firstItem="DEG-fq-cjd" firstAttribute="width" secondItem="gIp-Ho-8D9" secondAttribute="width" id="mYS-bH-DST"/>
+                </constraints>
+            </view>
+            <connections>
+                <outlet property="delegate" destination="-2" id="0bl-1N-x8E"/>
+            </connections>
+        </window>
+    </objects>
+</document>