diff --git a/src/gui/about.cpp b/src/gui/about.cpp
index e3a699ba1..6fb9c97b5 100644
--- a/src/gui/about.cpp
+++ b/src/gui/about.cpp
@@ -160,6 +160,9 @@ const char* aboutLine[]={
   "powered by:",
   "Dear ImGui by Omar Cornut",
   "SDL2 by Sam Lantinga",
+#ifdef HAVE_FREETYPE
+  "FreeType",
+#endif
   "zlib by Jean-loup Gailly",
   "and Mark Adler",
   "libsndfile by Erik de Castro Lopo",
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index e670f2463..d40688715 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -90,6 +90,10 @@ void FurnaceGUI::bindEngine(DivEngine* eng) {
   wavePreview.setEngine(e);
 }
 
+void FurnaceGUI::enableSafeMode() {
+  safeMode=true;
+}
+
 const char* FurnaceGUI::noteName(short note, short octave) {
   if (note==100) {
     return noteOffLabel;
@@ -1893,7 +1897,7 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
       if (!dirExists(workingDirFont)) workingDirFont=getHomeDir();
       hasOpened=fileDialog->openLoad(
         "Select Font",
-        {"compatible files", "*.ttf *.otf *.ttc"},
+        {"compatible files", "*.ttf *.otf *.ttc *.dfont *.pcf *.psf *.fon"},
         workingDirFont,
         dpiScale
       );
@@ -1902,7 +1906,7 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
       if (!dirExists(workingDirFont)) workingDirFont=getHomeDir();
       hasOpened=fileDialog->openLoad(
         "Select Font",
-        {"compatible files", "*.ttf *.otf *.ttc"},
+        {"compatible files", "*.ttf *.otf *.ttc *.dfont *.pcf *.psf *.fon"},
         workingDirFont,
         dpiScale
       );
@@ -1911,7 +1915,7 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
       if (!dirExists(workingDirFont)) workingDirFont=getHomeDir();
       hasOpened=fileDialog->openLoad(
         "Select Font",
-        {"compatible files", "*.ttf *.otf *.ttc"},
+        {"compatible files", "*.ttf *.otf *.ttc *.dfont *.pcf *.psf *.fon"},
         workingDirFont,
         dpiScale
       );
@@ -3849,7 +3853,7 @@ bool FurnaceGUI::loop() {
       continue;
     }
 
-    if (firstFrame) {
+    if (firstFrame && !safeMode) {
       if (!tutorial.introPlayed || settings.alwaysPlayIntro==3 || (settings.alwaysPlayIntro==2 && curFileName.empty())) {
         unsigned char* introTemp=new unsigned char[intro_fur_len];
         memcpy(introTemp,intro_fur,intro_fur_len);
@@ -6735,6 +6739,10 @@ bool FurnaceGUI::init() {
     SDL_SetHint(SDL_HINT_RENDER_DRIVER,settings.renderDriver.c_str());
   }
 
+  if (safeMode) {
+    SDL_SetHint(SDL_HINT_RENDER_DRIVER,"software");
+  }
+
   logD("starting render backend...");
   if (!rend->init(sdlWin)) {
     logE("it failed...");
@@ -7122,6 +7130,7 @@ FurnaceGUI::FurnaceGUI():
   displayEditString(false),
   mobileEdit(false),
   killGraphics(false),
+  safeMode(false),
   midiWakeUp(true),
   audioEngineChanged(false),
   settingsChanged(false),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 267cb3297..7335f687e 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1352,6 +1352,7 @@ class FurnaceGUI {
   bool displayPendingIns, pendingInsSingle, displayPendingRawSample, snesFilterHex, modTableHex, displayEditString;
   bool mobileEdit;
   bool killGraphics;
+  bool safeMode;
   bool midiWakeUp;
   bool audioEngineChanged, settingsChanged, debugFFT;
   bool willExport[DIV_MAX_CHIPS];
@@ -2457,6 +2458,7 @@ class FurnaceGUI {
     const char* noteName(short note, short octave);
     bool decodeNote(const char* what, short& note, short& octave);
     void bindEngine(DivEngine* eng);
+    void enableSafeMode();
     void updateScroll(int amount);
     void addScroll(int amount);
     void setFileName(String name);
diff --git a/src/gui/osc.cpp b/src/gui/osc.cpp
index dd40b9da0..8f8e8add4 100644
--- a/src/gui/osc.cpp
+++ b/src/gui/osc.cpp
@@ -260,7 +260,7 @@ void FurnaceGUI::drawOsc() {
       if (oscWidth>2048) oscWidth=2048;
 
       ImDrawListFlags prevFlags=dl->Flags;
-      if (!settings.oscAntiAlias) {
+      if (!settings.oscAntiAlias || safeMode) {
         dl->Flags&=~(ImDrawListFlags_AntiAliasedLines|ImDrawListFlags_AntiAliasedLinesUseTex);
       }
 
diff --git a/src/gui/render.cpp b/src/gui/render.cpp
index 5ad753c23..94600246a 100644
--- a/src/gui/render.cpp
+++ b/src/gui/render.cpp
@@ -32,7 +32,9 @@
 bool FurnaceGUI::initRender() {
   if (rend!=NULL) return false;
 
-  if (settings.renderBackend=="OpenGL") {
+  if (safeMode) {
+    renderBackend=GUI_BACKEND_SDL;
+  } else if (settings.renderBackend=="OpenGL") {
     renderBackend=GUI_BACKEND_GL;
   } else if (settings.renderBackend=="DirectX 11") {
     renderBackend=GUI_BACKEND_DX11;
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index ab0ef749c..dfc19462c 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -4805,6 +4805,16 @@ void FurnaceGUI::applyUISettings(bool updateFonts) {
     sty.FrameShading=(float)settings.guiColorsShading/100.0f;
   }
 
+  if (safeMode) {
+    sty.WindowRounding=0.0f;
+    sty.FrameRounding=0.0f;
+    sty.GrabRounding=0.0f;
+    sty.FrameShading=0.0f;
+    sty.AntiAliasedLines=false;
+    sty.AntiAliasedLinesUseTex=false;
+    sty.AntiAliasedFill=false;
+  }
+
   if (mobileUI) {
     sty.FramePadding=ImVec2(8.0f,6.0f);
   }
@@ -4847,7 +4857,7 @@ void FurnaceGUI::applyUISettings(bool updateFonts) {
     sysCmd2Grad[i]=ImGui::GetColorU32(ImVec4(base.x,base.y,base.z,((float)i/255.0f)*base.w));
   }
 
-  if (updateFonts) {
+  if (updateFonts && !safeMode) {
     // prepare
 #ifdef HAVE_FREETYPE
     if (settings.fontBackend==1) {
@@ -5091,6 +5101,15 @@ void FurnaceGUI::applyUISettings(bool updateFonts) {
       }
     }
 
+    mainFont->FallbackChar='?';
+    mainFont->EllipsisChar='.';
+    mainFont->EllipsisCharCount=3;
+  } else if (updateFonts) {
+    // safe mode
+    mainFont=ImGui::GetIO().Fonts->AddFontDefault();
+    patFont=mainFont;
+    bigFont=mainFont;
+    headFont=mainFont;
 
     mainFont->FallbackChar='?';
     mainFont->EllipsisChar='.';
@@ -5113,6 +5132,10 @@ void FurnaceGUI::applyUISettings(bool updateFonts) {
   ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".ttf",uiColors[GUI_COLOR_FILE_FONT],ICON_FA_FONT);
   ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".otf",uiColors[GUI_COLOR_FILE_FONT],ICON_FA_FONT);
   ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".ttc",uiColors[GUI_COLOR_FILE_FONT],ICON_FA_FONT);
+  ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".dfont",uiColors[GUI_COLOR_FILE_FONT],ICON_FA_FONT);
+  ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".fon",uiColors[GUI_COLOR_FILE_FONT],ICON_FA_FONT);
+  ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".pcf",uiColors[GUI_COLOR_FILE_FONT],ICON_FA_FONT);
+  ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".psf",uiColors[GUI_COLOR_FILE_FONT],ICON_FA_FONT);
 
   ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".mod",uiColors[GUI_COLOR_FILE_SONG_IMPORT],ICON_FA_FILE);
   ImGuiFileDialog::Instance()->SetFileStyle(IGFD_FileStyleByExtension,".fc13",uiColors[GUI_COLOR_FILE_SONG_IMPORT],ICON_FA_FILE);
diff --git a/src/main.cpp b/src/main.cpp
index 7c7c0dd51..3ae89b6a9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -75,6 +75,8 @@ bool displayEngineFailError=false;
 bool cmdOutBinary=false;
 bool vgmOutDirect=false;
 
+bool safeMode=false;
+
 std::vector<TAParam> params;
 
 TAParamResult pHelp(String) {
@@ -99,8 +101,10 @@ TAParamResult pAudio(String val) {
     e.setAudio(DIV_AUDIO_JACK);
   } else if (val=="sdl") {
     e.setAudio(DIV_AUDIO_SDL);
+  } else if (val=="portaudio") {
+    e.setAudio(DIV_AUDIO_PORTAUDIO);
   } else {
-    logE("invalid value for audio engine! valid values are: jack, sdl.");
+    logE("invalid value for audio engine! valid values are: jack, sdl, portaudio.");
     return TA_PARAM_ERROR;
   }
   return TA_PARAM_SUCCESS;
@@ -125,6 +129,11 @@ TAParamResult pConsole(String val) {
   return TA_PARAM_SUCCESS;
 }
 
+TAParamResult pSafeMode(String val) {
+  safeMode=true;
+  return TA_PARAM_SUCCESS;
+}
+
 TAParamResult pBinary(String val) {
   cmdOutBinary=true;
   return TA_PARAM_SUCCESS;
@@ -171,6 +180,9 @@ TAParamResult pVersion(String) {
   printf("- RtMidi by Gary P. Scavone (RtMidi license)\n");
   printf("- backward-cpp by Google (MIT)\n");
   printf("- Dear ImGui by Omar Cornut (MIT)\n");
+#ifdef HAVE_FREETYPE
+  printf("- FreeType (GPLv2)\n");
+#endif
   printf("- Portable File Dialogs by Sam Hocevar (WTFPL)\n");
   printf("- Native File Dialog (modified version) by Frogtoss Games (zlib license)\n");
   printf("- FFTW by Matteo Frigo and Steven G. Johnson (GPLv2)\n");
@@ -326,7 +338,7 @@ bool needsValue(String param) {
 void initParams() {
   params.push_back(TAParam("h","help",false,pHelp,"","display this help"));
 
-  params.push_back(TAParam("a","audio",true,pAudio,"jack|sdl","set audio engine (SDL by default)"));
+  params.push_back(TAParam("a","audio",true,pAudio,"jack|sdl|portaudio","set audio engine (SDL by default)"));
   params.push_back(TAParam("o","output",true,pOutput,"<filename>","output audio to file"));
   params.push_back(TAParam("O","vgmout",true,pVGMOut,"<filename>","output .vgm data"));
   params.push_back(TAParam("D","direct",false,pDirect,"","set VGM export direct stream mode"));
@@ -340,6 +352,7 @@ void initParams() {
   params.push_back(TAParam("l","loops",true,pLoops,"<count>","set number of loops (-1 means loop forever)"));
   params.push_back(TAParam("s","subsong",true,pSubSong,"<number>","set sub-song"));
   params.push_back(TAParam("o","outmode",true,pOutMode,"one|persys|perchan","set file output mode"));
+  params.push_back(TAParam("S","safemode",false,pSafeMode,"","enable safe mode (software rendering and no audio)"));
 
   params.push_back(TAParam("B","benchmark",true,pBenchmark,"render|seek","run performance test"));
 
@@ -496,6 +509,10 @@ int main(int argc, char** argv) {
 
   e.preInit();
 
+  if (safeMode) {
+    e.setAudio(DIV_AUDIO_DUMMY);
+  }
+
   if (!fileName.empty() && ((!e.getConfBool("tutIntroPlayed",false)) || e.getConfInt("alwaysPlayIntro",0)!=3 || consoleMode || benchMode || outName!="" || vgmOutName!="" || cmdOutName!="")) {
     logI("loading module...");
     FILE* f=ps_fopen(fileName.c_str(),"rb");
@@ -654,6 +671,7 @@ int main(int argc, char** argv) {
   }
 
 #ifdef HAVE_GUI
+  if (safeMode) g.enableSafeMode();
   g.bindEngine(&e);
   if (!g.init()) {
     reportError(g.getLastError());