diff --git a/Ample.xcodeproj/project.pbxproj b/Ample.xcodeproj/project.pbxproj
index c214e07..35b1a3a 100644
--- a/Ample.xcodeproj/project.pbxproj
+++ b/Ample.xcodeproj/project.pbxproj
@@ -61,6 +61,7 @@
 		B64E15A924EA1D5300E8AD3D /* MachineViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = B64E15A824EA1D5300E8AD3D /* MachineViewController.m */; };
 		B65593B124ECB61800722E0C /* SlotViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = B65593B024ECB61800722E0C /* SlotViewController.m */; };
 		B658DBF324FB58EC0063AB5F /* Info.plist in Resources */ = {isa = PBXBuildFile; fileRef = B6BA258624E99BEB005FB8FF /* Info.plist */; };
+		B66236A924FD9A34006CABD7 /* PreferencesWindowController.m in Sources */ = {isa = PBXBuildFile; fileRef = B66236A824FD9A34006CABD7 /* PreferencesWindowController.m */; };
 		B6BA258024E99BE9005FB8FF /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = B6BA257F24E99BE9005FB8FF /* AppDelegate.m */; };
 		B6BA258224E99BEB005FB8FF /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = B6BA258124E99BEB005FB8FF /* Assets.xcassets */; };
 		B6BA258524E99BEB005FB8FF /* MainMenu.xib in Resources */ = {isa = PBXBuildFile; fileRef = B6BA258324E99BEB005FB8FF /* MainMenu.xib */; };
@@ -131,6 +132,8 @@
 		B64E15A824EA1D5300E8AD3D /* MachineViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MachineViewController.m; sourceTree = "<group>"; };
 		B65593AF24ECB61800722E0C /* SlotViewController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SlotViewController.h; sourceTree = "<group>"; };
 		B65593B024ECB61800722E0C /* SlotViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SlotViewController.m; sourceTree = "<group>"; };
+		B66236A724FD9A34006CABD7 /* PreferencesWindowController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = PreferencesWindowController.h; sourceTree = "<group>"; };
+		B66236A824FD9A34006CABD7 /* PreferencesWindowController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = PreferencesWindowController.m; sourceTree = "<group>"; };
 		B67BD48424EE249D0073E334 /* apple1.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = apple1.plist; sourceTree = "<group>"; };
 		B6BA257B24E99BE9005FB8FF /* Ample.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Ample.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		B6BA257E24E99BE9005FB8FF /* AppDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
@@ -271,6 +274,8 @@
 				B6D6DE3C24FADF8B00661A5F /* LaunchWindow.xib */,
 				B6004DEF24FB05D600D38596 /* LogWindow.xib */,
 				B6D6DE3724FAC8B500661A5F /* Preferences.xib */,
+				B66236A724FD9A34006CABD7 /* PreferencesWindowController.h */,
+				B66236A824FD9A34006CABD7 /* PreferencesWindowController.m */,
 				B61099E524F5F230005CB652 /* MediaView.xib */,
 				B61099E324F5F230005CB652 /* SlotView.xib */,
 			);
@@ -405,6 +410,7 @@
 				B60A6E1424EE0AE2004B7EEF /* FlippedView.m in Sources */,
 				B6BA258024E99BE9005FB8FF /* AppDelegate.m in Sources */,
 				B6004DF024FB05D600D38596 /* LogWindowController.m in Sources */,
+				B66236A924FD9A34006CABD7 /* PreferencesWindowController.m in Sources */,
 				B65593B124ECB61800722E0C /* SlotViewController.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/Ample/AppDelegate.m b/Ample/AppDelegate.m
index 1426754..a41929f 100644
--- a/Ample/AppDelegate.m
+++ b/Ample/AppDelegate.m
@@ -10,6 +10,7 @@
 #import "SlotViewController.h"
 #import "MediaViewController.h"
 #import "LaunchWindowController.h"
+#import "PreferencesWindowController.h"
 
 @interface AppDelegate ()
 
@@ -58,7 +59,7 @@
 
 - (IBAction)displayPreferences:(id)sender {
     if (!_prefs) {
-        _prefs = [[NSWindowController alloc] initWithWindowNibName: @"Preferences"];
+        _prefs = [PreferencesWindowController new];
     }
     [_prefs showWindow: sender];
 }
diff --git a/Ample/Base.lproj/Preferences.xib b/Ample/Base.lproj/Preferences.xib
index 52d23d2..d77c51c 100644
--- a/Ample/Base.lproj/Preferences.xib
+++ b/Ample/Base.lproj/Preferences.xib
@@ -6,9 +6,10 @@
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
-        <customObject id="-2" userLabel="File's Owner" customClass="NSWindowController">
+        <customObject id="-2" userLabel="File's Owner" customClass="PreferencesWindowController">
             <connections>
-                <outlet property="window" destination="QvC-M9-y7g" id="SHw-b5-d6g"/>
+                <outlet property="pathField" destination="Oz5-Xb-btk" id="EnV-kr-0XI"/>
+                <outlet property="window" destination="QvC-M9-y7g" id="xJa-tx-X62"/>
             </connections>
         </customObject>
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
@@ -23,7 +24,7 @@
                 <autoresizingMask key="autoresizingMask"/>
                 <subviews>
                     <textField verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Oz5-Xb-btk">
-                        <rect key="frame" x="98" y="229" width="362" height="21"/>
+                        <rect key="frame" x="98" y="181" width="362" height="21"/>
                         <autoresizingMask key="autoresizingMask" flexibleMinX="YES" widthSizable="YES" flexibleMinY="YES"/>
                         <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" selectable="YES" editable="YES" sendsActionOnEndEditing="YES" borderStyle="bezel" drawsBackground="YES" id="vDR-2V-qxd">
                             <font key="font" usesAppearanceFont="YES"/>
@@ -31,11 +32,12 @@
                             <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
                         </textFieldCell>
                         <connections>
+                            <action selector="pathChanged:" target="-2" id="RRj-dC-q2y"/>
                             <binding destination="yvB-HG-64y" name="value" keyPath="values.MamePath" id="H3O-1l-peo"/>
                         </connections>
                     </textField>
                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Qmb-Ag-Xyr">
-                        <rect key="frame" x="18" y="232" width="74" height="16"/>
+                        <rect key="frame" x="18" y="184" width="74" height="16"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <textFieldCell key="cell" lineBreakMode="clipping" title="MAME Path" id="Xcq-4g-Wlw">
                             <font key="font" metaFont="system"/>
@@ -44,7 +46,7 @@
                         </textFieldCell>
                     </textField>
                     <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="KAN-P2-ydI">
-                        <rect key="frame" x="96" y="205" width="217" height="18"/>
+                        <rect key="frame" x="96" y="234" width="217" height="18"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                         <buttonCell key="cell" type="check" title="Close log window on normal exit" bezelStyle="regularSquare" imagePosition="left" state="on" inset="2" id="QMz-O0-06U">
                             <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -54,6 +56,17 @@
                             <binding destination="yvB-HG-64y" name="value" keyPath="values.AutoCloseLogWindow" id="q0L-GA-wM2"/>
                         </connections>
                     </button>
+                    <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="j7D-jC-17Q">
+                        <rect key="frame" x="96" y="208" width="137" height="18"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                        <buttonCell key="cell" type="check" title="Use System MAME" bezelStyle="regularSquare" imagePosition="left" state="on" inset="2" id="V61-mz-QFo">
+                            <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                            <font key="font" metaFont="system"/>
+                        </buttonCell>
+                        <connections>
+                            <binding destination="yvB-HG-64y" name="value" keyPath="values.UseSystemMame" id="jIh-qD-e5H"/>
+                        </connections>
+                    </button>
                 </subviews>
             </view>
             <point key="canvasLocation" x="140" y="147"/>
diff --git a/Ample/Defaults.plist b/Ample/Defaults.plist
index 8e3cf51..340dd9d 100644
--- a/Ample/Defaults.plist
+++ b/Ample/Defaults.plist
@@ -2,6 +2,8 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>UseSystemMame</key>
+	<true/>
 	<key>AutoCloseLogWindow</key>
 	<true/>
 	<key>MamePath</key>
diff --git a/Ample/PreferencesWindowController.h b/Ample/PreferencesWindowController.h
new file mode 100644
index 0000000..a65f2c8
--- /dev/null
+++ b/Ample/PreferencesWindowController.h
@@ -0,0 +1,17 @@
+//
+//  PreferencesWindowController.h
+//  Ample
+//
+//  Created by Kelvin Sherlock on 8/31/2020.
+//  Copyright © 2020 Kelvin Sherlock. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface PreferencesWindowController : NSWindowController
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Ample/PreferencesWindowController.m b/Ample/PreferencesWindowController.m
new file mode 100644
index 0000000..eb97fce
--- /dev/null
+++ b/Ample/PreferencesWindowController.m
@@ -0,0 +1,51 @@
+//
+//  PreferencesWindowController.m
+//  Ample
+//
+//  Created by Kelvin Sherlock on 8/31/2020.
+//  Copyright © 2020 Kelvin Sherlock. All rights reserved.
+//
+
+#import "PreferencesWindowController.h"
+
+@interface PreferencesWindowController ()
+@property (weak) IBOutlet NSTextField *pathField;
+
+@end
+
+@implementation PreferencesWindowController
+
+-(NSString *)windowNibName {
+    return @"Preferences";
+}
+
+- (void)windowDidLoad {
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+    [super windowDidLoad];
+    
+    // Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
+    
+    [self validateMamePath: [defaults stringForKey: @"MamePath"]];
+    
+}
+
+-(void)validateMamePath: (NSString *)path {
+    NSFileManager * fm = [NSFileManager defaultManager];
+
+    if ([path length] == 0 || [fm isExecutableFileAtPath: path]) {
+        [_pathField setTextColor: [NSColor blackColor]];
+    } else {
+        [_pathField setTextColor: [NSColor redColor]];
+    }
+}
+
+- (IBAction)pathChanged:(id)sender {
+
+    NSString *path = [sender stringValue];
+    
+    [self validateMamePath: path];
+
+}
+
+
+@end