diff --git a/Mariani.xcodeproj/project.pbxproj b/Mariani.xcodeproj/project.pbxproj
index 4a5da6afc..4cc11eb35 100644
--- a/Mariani.xcodeproj/project.pbxproj
+++ b/Mariani.xcodeproj/project.pbxproj
@@ -15,6 +15,8 @@
 		976D11AC2B379D9000EEA1D6 /* CharacterMappings.h in Headers */ = {isa = PBXBuildFile; fileRef = 976D11A92B379D9000EEA1D6 /* CharacterMappings.h */; };
 		976D11AD2B379D9000EEA1D6 /* CharacterMappings.mm in Sources */ = {isa = PBXBuildFile; fileRef = 976D11AA2B379D9000EEA1D6 /* CharacterMappings.mm */; };
 		976D11AE2B379D9000EEA1D6 /* CharacterMappings.mm in Sources */ = {isa = PBXBuildFile; fileRef = 976D11AA2B379D9000EEA1D6 /* CharacterMappings.mm */; };
+		979E45D62CF56C2700D6A957 /* HDC-SmartPort.bin in Resources */ = {isa = PBXBuildFile; fileRef = 979E45CD2CF56C2700D6A957 /* HDC-SmartPort.bin */; };
+		979E45D72CF56C2700D6A957 /* HDC-SmartPort.bin in Resources */ = {isa = PBXBuildFile; fileRef = 979E45CD2CF56C2700D6A957 /* HDC-SmartPort.bin */; };
 		97ACC9C22C3B2C3E0028821E /* PageConfig.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 97ACC9BC2C3B2C3E0028821E /* PageConfig.cpp */; };
 		97ACC9C32C3B2C3E0028821E /* PageInput.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 97ACC9BD2C3B2C3E0028821E /* PageInput.cpp */; };
 		97ACC9C42C3B2C3E0028821E /* PageSound.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 97ACC9BE2C3B2C3E0028821E /* PageSound.cpp */; };
@@ -721,6 +723,7 @@
 		9765C6162B26452B00C8AF42 /* cadirectsound.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = cadirectsound.cpp; sourceTree = "<group>"; };
 		976D11A92B379D9000EEA1D6 /* CharacterMappings.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = CharacterMappings.h; sourceTree = "<group>"; };
 		976D11AA2B379D9000EEA1D6 /* CharacterMappings.mm */ = {isa = PBXFileReference; explicitFileType = sourcecode.cpp.objcpp; path = CharacterMappings.mm; sourceTree = "<group>"; };
+		979E45CD2CF56C2700D6A957 /* HDC-SmartPort.bin */ = {isa = PBXFileReference; lastKnownFileType = archive.macbinary; name = "HDC-SmartPort.bin"; path = "resource/HDC-SmartPort.bin"; sourceTree = SOURCE_ROOT; };
 		97ACC9BC2C3B2C3E0028821E /* PageConfig.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = PageConfig.cpp; path = source/linux/duplicates/PageConfig.cpp; sourceTree = "<group>"; };
 		97ACC9BD2C3B2C3E0028821E /* PageInput.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = PageInput.cpp; path = source/linux/duplicates/PageInput.cpp; sourceTree = "<group>"; };
 		97ACC9BE2C3B2C3E0028821E /* PageSound.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = PageSound.cpp; path = source/linux/duplicates/PageSound.cpp; sourceTree = "<group>"; };
@@ -1552,6 +1555,7 @@
 				B045FE682782984E006E36F9 /* Base64A.rom */,
 				B045FE5E2782984E006E36F9 /* DISK2-13sector.rom */,
 				B045FE652782984E006E36F9 /* DISK2.rom */,
+				979E45CD2CF56C2700D6A957 /* HDC-SmartPort.bin */,
 				B045FE602782984E006E36F9 /* Hddrvr.bin */,
 				B045FE712782984F006E36F9 /* Mockingboard-D.rom */,
 				B045FE5F2782984E006E36F9 /* MouseInterface.rom */,
@@ -2765,6 +2769,7 @@
 				B0F97BC02A26758E00461923 /* A2_BASIC.SYM in Resources */,
 				B00BE9EA2A291BD100F288F9 /* InspectorPanels.xib in Resources */,
 				B00ECBD0279EEB600041E16C /* DISK2-13sector.rom in Resources */,
+				979E45D72CF56C2700D6A957 /* HDC-SmartPort.bin in Resources */,
 				B0F43FDE295E4BAD00E79AD7 /* CHARSET82.bmp in Resources */,
 				B00ECBD1279EEB600041E16C /* DISK2.rom in Resources */,
 				B00ECBD2279EEB600041E16C /* MainMenu.xib in Resources */,
@@ -2812,6 +2817,7 @@
 				B0F97BBF2A26758E00461923 /* A2_BASIC.SYM in Resources */,
 				B00BE9E92A291BD100F288F9 /* InspectorPanels.xib in Resources */,
 				B045FE742782984F006E36F9 /* DISK2-13sector.rom in Resources */,
+				979E45D62CF56C2700D6A957 /* HDC-SmartPort.bin in Resources */,
 				B0F43FDD295E4BAD00E79AD7 /* CHARSET82.bmp in Resources */,
 				B045FE7B2782984F006E36F9 /* DISK2.rom in Resources */,
 				B032DE2B277A0C24006DC0F7 /* MainMenu.xib in Resources */,
@@ -3432,7 +3438,7 @@
 				CODE_SIGN_ENTITLEMENTS = "";
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 1;
+				CURRENT_PROJECT_VERSION = 3;
 				FRAMEWORK_SEARCH_PATHS = ../;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "";
@@ -3468,7 +3474,7 @@
 				CODE_SIGN_ENTITLEMENTS = "";
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 1;
+				CURRENT_PROJECT_VERSION = 3;
 				FRAMEWORK_SEARCH_PATHS = ../;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "";
@@ -3665,7 +3671,7 @@
 				CODE_SIGN_ENTITLEMENTS = "";
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 1;
+				CURRENT_PROJECT_VERSION = 3;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "";
 				GCC_PREPROCESSOR_DEFINITIONS = "$(inherited)";
@@ -3705,7 +3711,7 @@
 				CODE_SIGN_ENTITLEMENTS = "";
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 1;
+				CURRENT_PROJECT_VERSION = 3;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "";
 				GCC_PREPROCESSOR_DEFINITIONS = "$(inherited)";
diff --git a/source/frontends/mariani/EmulatorViewController.mm b/source/frontends/mariani/EmulatorViewController.mm
index 67397a963..1e1d62ed6 100644
--- a/source/frontends/mariani/EmulatorViewController.mm
+++ b/source/frontends/mariani/EmulatorViewController.mm
@@ -183,8 +183,7 @@ - (void)start {
     displayLinkCallbackCount = 0;
 #endif // SHOW_FPS
     
-    self.runLoopTimer = [NSTimer timerWithTimeInterval:0 target:self selector:@selector(runLoopTimerFired) userInfo:nil repeats:YES];
-    [[NSRunLoop currentRunLoop] addTimer:self.runLoopTimer forMode:NSRunLoopCommonModes];
+    [self startRunLoopTimer];
     
 #ifdef SHOW_FPS
     [NSTimer scheduledTimerWithTimeInterval:1 repeats:YES block:^(NSTimer * _Nonnull timer) {
@@ -215,6 +214,11 @@ static CVReturn MyDisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTime
     return kCVReturnSuccess;
 }
 
+- (void)startRunLoopTimer {
+    self.runLoopTimer = [NSTimer timerWithTimeInterval:0 target:self selector:@selector(runLoopTimerFired) userInfo:nil repeats:YES];
+    [[NSRunLoop currentRunLoop] addTimer:self.runLoopTimer forMode:NSRunLoopCommonModes];
+}
+
 - (void)runLoopTimerFired {
     // g_nAppMode can change through a debugger CLI command, so we notice it and notify others
     if (self.savedAppMode != g_nAppMode) {
@@ -399,7 +403,10 @@ - (void)resetSpeed {
 }
 
 - (void)reboot {
+    // don't try to run the emulator during a restart
+    [self.runLoopTimer invalidate];
     frame->Restart();
+    [self startRunLoopTimer];
     [[NSNotificationCenter defaultCenter] postNotificationName:EmulatorDidRebootNotification object:self];
 }