diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6171029b8..ea612efbd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -694,6 +694,7 @@ src/engine/configEngine.cpp
 src/engine/dispatchContainer.cpp
 src/engine/engine.cpp
 src/engine/export.cpp
+src/engine/exportDef.cpp
 src/engine/fileOpsIns.cpp
 src/engine/fileOpsSample.cpp
 src/engine/filter.cpp
@@ -711,7 +712,6 @@ src/engine/wavOps.cpp
 src/engine/vgmOps.cpp
 src/engine/zsmOps.cpp
 src/engine/zsm.cpp
-src/engine/tiunaOps.cpp
 
 src/engine/platform/abstract.cpp
 src/engine/platform/genesis.cpp
@@ -789,6 +789,7 @@ src/engine/platform/dummy.cpp
 
 src/engine/export/abstract.cpp
 src/engine/export/amigaValidation.cpp
+src/engine/export/tiuna.cpp
 
 src/engine/effect/abstract.cpp
 src/engine/effect/dummy.cpp
diff --git a/demos/a2600/TIADeepIntoCode.fur b/demos/a2600/TIADeepIntoCode.fur
new file mode 100644
index 000000000..0a952a9c9
Binary files /dev/null and b/demos/a2600/TIADeepIntoCode.fur differ
diff --git a/demos/a2600/Watch My Tone.fur b/demos/a2600/Watch My Tone.fur
new file mode 100644
index 000000000..8bfe4df17
Binary files /dev/null and b/demos/a2600/Watch My Tone.fur differ
diff --git a/demos/esfm/WindFjordsESFM.fur b/demos/esfm/WindFjordsESFM.fur
new file mode 100644
index 000000000..fdd32fe24
Binary files /dev/null and b/demos/esfm/WindFjordsESFM.fur differ
diff --git a/demos/genesis/imaginarium.fur b/demos/genesis/imaginarium.fur
new file mode 100644
index 000000000..842ec8575
Binary files /dev/null and b/demos/genesis/imaginarium.fur differ
diff --git a/demos/msx/Juice_Stand.fur b/demos/msx/Juice_Stand.fur
new file mode 100644
index 000000000..73e550b83
Binary files /dev/null and b/demos/msx/Juice_Stand.fur differ
diff --git a/demos/multichip/TheOnlyWayIsForward.fur b/demos/multichip/TheOnlyWayIsForward.fur
new file mode 100644
index 000000000..faca66ad2
Binary files /dev/null and b/demos/multichip/TheOnlyWayIsForward.fur differ
diff --git a/demos/nes/Byte-Sized Bop.fur b/demos/nes/Byte-Sized Bop.fur
new file mode 100644
index 000000000..2adcac8e6
Binary files /dev/null and b/demos/nes/Byte-Sized Bop.fur differ
diff --git a/demos/nes/Super cool and awesome samurai.fur b/demos/nes/Super cool and awesome samurai.fur
new file mode 100644
index 000000000..58c0d73ff
Binary files /dev/null and b/demos/nes/Super cool and awesome samurai.fur differ
diff --git a/demos/nes/The East.fur b/demos/nes/The East.fur
new file mode 100644
index 000000000..89f8027a1
Binary files /dev/null and b/demos/nes/The East.fur differ
diff --git a/demos/opl/I_won_t_be_there_again.fur b/demos/opl/I_won_t_be_there_again.fur
new file mode 100644
index 000000000..81e6621db
Binary files /dev/null and b/demos/opl/I_won_t_be_there_again.fur differ
diff --git a/demos/snes/Dear Blue SNES.fur b/demos/snes/Dear Blue SNES.fur
new file mode 100644
index 000000000..50b016ed7
Binary files /dev/null and b/demos/snes/Dear Blue SNES.fur differ
diff --git a/demos/snes/Sunken Lights.fur b/demos/snes/Sunken Lights.fur
new file mode 100644
index 000000000..5de7e687b
Binary files /dev/null and b/demos/snes/Sunken Lights.fur differ
diff --git a/demos/snes/analog.fur b/demos/snes/analog.fur
new file mode 100644
index 000000000..7b30bc4ef
Binary files /dev/null and b/demos/snes/analog.fur differ
diff --git a/demos/snes/aurora.fur b/demos/snes/aurora.fur
new file mode 100644
index 000000000..61742fcf2
Binary files /dev/null and b/demos/snes/aurora.fur differ
diff --git a/demos/snes/encjslt.fur b/demos/snes/encjslt.fur
new file mode 100644
index 000000000..a01c7f5b7
Binary files /dev/null and b/demos/snes/encjslt.fur differ
diff --git a/demos/snes/sound processing unit.fur b/demos/snes/sound processing unit.fur
new file mode 100644
index 000000000..a2749d224
Binary files /dev/null and b/demos/snes/sound processing unit.fur differ
diff --git a/demos/snes/spd10.fur b/demos/snes/spd10.fur
new file mode 100644
index 000000000..3cb0ab0c9
Binary files /dev/null and b/demos/snes/spd10.fur differ
diff --git a/demos/snes/spd12.fur b/demos/snes/spd12.fur
new file mode 100644
index 000000000..12b2cd2c4
Binary files /dev/null and b/demos/snes/spd12.fur differ
diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 1a382b85e..e9b3255c3 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -3589,6 +3589,12 @@ void DivEngine::synchronized(const std::function<void()>& what) {
   BUSY_END;
 }
 
+void DivEngine::synchronizedSoft(const std::function<void()>& what) {
+  BUSY_BEGIN_SOFT;
+  what();
+  BUSY_END;
+}
+
 void DivEngine::lockSave(const std::function<void()>& what) {
   saveLock.lock();
   what();
@@ -3916,6 +3922,9 @@ bool DivEngine::preInit(bool noSafeMode) {
   // register systems
   if (!systemsRegistered) registerSystems();
 
+  // register ROM exports
+  if (!romExportsRegistered) registerROMExports();
+
   // TODO: re-enable with a better approach
   // see issue #1581
   /*
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 2a7718c1d..f010d7001 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -54,8 +54,8 @@ class DivWorkPool;
 
 #define DIV_UNSTABLE
 
-#define DIV_VERSION "Import Test"
-#define DIV_ENGINE_VERSION 216
+#define DIV_VERSION "dev217"
+#define DIV_ENGINE_VERSION 217
 // for imports
 #define DIV_VERSION_MOD 0xff01
 #define DIV_VERSION_FC 0xff02
@@ -465,6 +465,7 @@ class DivEngine {
   bool midiIsDirectProgram;
   bool lowLatency;
   bool systemsRegistered;
+  bool romExportsRegistered;
   bool hasLoadedSomething;
   bool midiOutClock;
   bool midiOutTime;
@@ -518,6 +519,7 @@ class DivEngine {
   static DivSysDef* sysDefs[DIV_MAX_CHIP_DEFS];
   static DivSystem sysFileMapFur[DIV_MAX_CHIP_DEFS];
   static DivSystem sysFileMapDMF[DIV_MAX_CHIP_DEFS];
+  static DivROMExportDef* romExportDefs[DIV_ROM_MAX];
 
   DivCSPlayer* cmdStreamInt;
 
@@ -624,6 +626,7 @@ class DivEngine {
   bool deinitAudioBackend(bool dueToSwitchMaster=false);
 
   void registerSystems();
+  void registerROMExports();
   void initSongWithDesc(const char* description, bool inBase64=true, bool oldVol=false);
 
   void exchangeIns(int one, int two);
@@ -654,6 +657,7 @@ class DivEngine {
   // add every export method here
   friend class DivROMExport;
   friend class DivExportAmigaValidation;
+  friend class DivExportTiuna;
 
   public:
     DivSong song;
@@ -697,9 +701,8 @@ class DivEngine {
     // save as .fur.
     // if notPrimary is true then the song will not be altered
     SafeWriter* saveFur(bool notPrimary=false, bool newPatternFormat=true);
-    // build a ROM file (TODO).
-    // specify system to build ROM for.
-    std::vector<DivROMExportOutput> buildROM(DivROMExportOptions sys);
+    // return a ROM exporter.
+    DivROMExport* buildROM(DivROMExportOptions sys);
     // dump to VGM.
     // set trailingTicks to:
     // - 0 to add one tick of trailing
@@ -885,6 +888,9 @@ class DivEngine {
     // get sys definition
     const DivSysDef* getSystemDef(DivSystem sys);
 
+    // get ROM export definition
+    const DivROMExportDef* getROMExportDef(DivROMExportOptions opt);
+
     // convert sample rate format
     int fileToDivRate(int frate);
     int divToFileRate(int drate);
@@ -1294,6 +1300,9 @@ class DivEngine {
     // perform secure/sync operation
     void synchronized(const std::function<void()>& what);
 
+    // perform secure/sync operation (soft)
+    void synchronizedSoft(const std::function<void()>& what);
+
     // perform secure/sync song operation
     void lockSave(const std::function<void()>& what);
 
@@ -1361,6 +1370,7 @@ class DivEngine {
       midiIsDirectProgram(false),
       lowLatency(false),
       systemsRegistered(false),
+      romExportsRegistered(false),
       hasLoadedSomething(false),
       midiOutClock(false),
       midiOutTime(false),
@@ -1467,6 +1477,7 @@ class DivEngine {
       memset(pitchTable,0,4096*sizeof(int));
       memset(effectSlotMap,-1,4096*sizeof(short));
       memset(sysDefs,0,DIV_MAX_CHIP_DEFS*sizeof(void*));
+      memset(romExportDefs,0,DIV_ROM_MAX*sizeof(void*));
       memset(walked,0,8192);
       memset(oscBuf,0,DIV_MAX_OUTPUTS*(sizeof(float*)));
       memset(exportChannelMask,1,DIV_MAX_CHANS*sizeof(bool));
diff --git a/src/engine/export.cpp b/src/engine/export.cpp
index 2ea35327f..33544e252 100644
--- a/src/engine/export.cpp
+++ b/src/engine/export.cpp
@@ -20,18 +20,20 @@
 #include "engine.h"
 
 #include "export/amigaValidation.h"
+#include "export/tiuna.h"
 
-std::vector<DivROMExportOutput> DivEngine::buildROM(DivROMExportOptions sys) {
+DivROMExport* DivEngine::buildROM(DivROMExportOptions sys) {
   DivROMExport* exporter=NULL;
   switch (sys) {
     case DIV_ROM_AMIGA_VALIDATION:
       exporter=new DivExportAmigaValidation;
       break;
+    case DIV_ROM_TIUNA:
+      exporter=new DivExportTiuna;
+      break;
     default:
       exporter=new DivROMExport;
       break;
   }
-  std::vector<DivROMExportOutput> ret=exporter->go(this);
-  delete exporter;
-  return ret;
+  return exporter;
 }
diff --git a/src/engine/export.h b/src/engine/export.h
index d8e1878f1..f9439fc95 100644
--- a/src/engine/export.h
+++ b/src/engine/export.h
@@ -29,6 +29,8 @@ class DivEngine;
 enum DivROMExportOptions {
   DIV_ROM_ABSTRACT=0,
   DIV_ROM_AMIGA_VALIDATION,
+  DIV_ROM_ZSM,
+  DIV_ROM_TIUNA,
 
   DIV_ROM_MAX
 };
@@ -45,30 +47,61 @@ struct DivROMExportOutput {
     data(NULL) {}
 };
 
+struct DivROMExportProgress {
+  String name;
+  float amount;
+};
+
 class DivROMExport {
+  protected:
+    DivConfig conf;
+    std::vector<DivROMExportOutput> output;
+    void logAppend(String what);
   public:
-    virtual std::vector<DivROMExportOutput> go(DivEngine* e);
+    std::vector<String> exportLog;
+    std::mutex logLock;
+
+    void setConf(DivConfig& c);
+    virtual bool go(DivEngine* eng);
+    virtual void abort();
+    virtual void wait();
+    std::vector<DivROMExportOutput>& getResult();
+    virtual bool hasFailed();
+    virtual bool isRunning();
+    virtual DivROMExportProgress getProgress(int index=0);
     virtual ~DivROMExport() {}
 };
 
+#define logAppendf(...) logAppend(fmt::sprintf(__VA_ARGS__))
+
+enum DivROMExportReqPolicy {
+  // exactly these chips.
+  DIV_REQPOL_EXACT=0,
+  // specified chips must be present but any amount of them is acceptable.
+  DIV_REQPOL_ANY,
+  // at least one of the specified chips.
+  DIV_REQPOL_LAX
+};
+
 struct DivROMExportDef {
   const char* name;
   const char* author;
   const char* description;
-  DivSystem requisites[32];
-  int requisitesLen;
+  const char* fileType;
+  const char* fileExt;
+  std::vector<DivSystem> requisites;
   bool multiOutput;
+  DivROMExportReqPolicy requisitePolicy;
 
-  DivROMExportDef(const char* n, const char* a, const char* d, std::initializer_list<DivSystem> req, bool multiOut):
+  DivROMExportDef(const char* n, const char* a, const char* d, const char* ft, const char* fe, std::initializer_list<DivSystem> req, bool multiOut, DivROMExportReqPolicy reqPolicy):
     name(n),
     author(a),
     description(d),
-    multiOutput(multiOut) {
-    requisitesLen=0;
-    memset(requisites,0,32*sizeof(DivSystem));
-    for (DivSystem i: req) {
-      requisites[requisitesLen++]=i;
-    }
+    fileType(ft),
+    fileExt(fe),
+    multiOutput(multiOut),
+    requisitePolicy(reqPolicy) {
+    requisites=req;
   }
 };
 
diff --git a/src/engine/export/abstract.cpp b/src/engine/export/abstract.cpp
index bd39e3aa0..c6d0ec799 100644
--- a/src/engine/export/abstract.cpp
+++ b/src/engine/export/abstract.cpp
@@ -20,7 +20,42 @@
 #include "../export.h"
 #include "../../ta-log.h"
 
-std::vector<DivROMExportOutput> DivROMExport::go(DivEngine* e) {
+bool DivROMExport::go(DivEngine* eng) {
   logW("what's this? the null ROM export?");
-  return std::vector<DivROMExportOutput>();
+  return false;
+}
+
+void DivROMExport::abort() {
+}
+
+std::vector<DivROMExportOutput>& DivROMExport::getResult() {
+  return output;
+}
+
+bool DivROMExport::hasFailed() {
+  return true;
+}
+
+DivROMExportProgress DivROMExport::getProgress(int index) {
+  DivROMExportProgress ret;
+  ret.name="";
+  ret.amount=0.0f;
+  return ret;
+}
+
+void DivROMExport::logAppend(String what) {
+  logLock.lock();
+  exportLog.push_back(what);
+  logLock.unlock();
+}
+
+void DivROMExport::wait() {
+}
+
+bool DivROMExport::isRunning() {
+  return false;
+}
+
+void DivROMExport::setConf(DivConfig& c) {
+  conf=c;
 }
diff --git a/src/engine/export/amigaValidation.cpp b/src/engine/export/amigaValidation.cpp
index a613ee422..5fce7a920 100644
--- a/src/engine/export/amigaValidation.cpp
+++ b/src/engine/export/amigaValidation.cpp
@@ -40,8 +40,7 @@ struct SampleBookEntry {
     len(0) {}
 };
 
-std::vector<DivROMExportOutput> DivExportAmigaValidation::go(DivEngine* e) {
-  std::vector<DivROMExportOutput> ret;
+void DivExportAmigaValidation::run() {
   std::vector<WaveEntry> waves;
   std::vector<SampleBookEntry> sampleBook;
   unsigned int wavesDataPtr=0;
@@ -71,6 +70,7 @@ std::vector<DivROMExportOutput> DivExportAmigaValidation::go(DivEngine* e) {
   bool done=false;
 
   // sample.bin
+  logAppend("writing samples...");
   SafeWriter* sample=new SafeWriter;
   sample->init();
   for (int i=0; i<256; i++) {
@@ -80,6 +80,7 @@ std::vector<DivROMExportOutput> DivExportAmigaValidation::go(DivEngine* e) {
   if (sample->tell()&1) sample->writeC(0);
 
   // seq.bin
+  logAppend("making sequence...");
   SafeWriter* seq=new SafeWriter;
   seq->init();
 
@@ -240,6 +241,7 @@ std::vector<DivROMExportOutput> DivExportAmigaValidation::go(DivEngine* e) {
   EXTERN_BUSY_END;
 
   // wave.bin
+  logAppend("writing wavetables...");
   SafeWriter* wave=new SafeWriter;
   wave->init();
   for (WaveEntry& i: waves) {
@@ -247,6 +249,7 @@ std::vector<DivROMExportOutput> DivExportAmigaValidation::go(DivEngine* e) {
   }
   
   // sbook.bin
+  logAppend("writing sample book...");
   SafeWriter* sbook=new SafeWriter;
   sbook->init();
   for (SampleBookEntry& i: sampleBook) {
@@ -256,6 +259,7 @@ std::vector<DivROMExportOutput> DivExportAmigaValidation::go(DivEngine* e) {
   }
 
   // wbook.bin
+  logAppend("writing wavetable book...");
   SafeWriter* wbook=new SafeWriter;
   wbook->init();
   for (WaveEntry& i: waves) {
@@ -266,12 +270,40 @@ std::vector<DivROMExportOutput> DivExportAmigaValidation::go(DivEngine* e) {
   }
 
   // finish
-  ret.reserve(5);
-  ret.push_back(DivROMExportOutput("sbook.bin",sbook));
-  ret.push_back(DivROMExportOutput("wbook.bin",wbook));
-  ret.push_back(DivROMExportOutput("sample.bin",sample));
-  ret.push_back(DivROMExportOutput("wave.bin",wave));
-  ret.push_back(DivROMExportOutput("seq.bin",seq));
+  output.reserve(5);
+  output.push_back(DivROMExportOutput("sbook.bin",sbook));
+  output.push_back(DivROMExportOutput("wbook.bin",wbook));
+  output.push_back(DivROMExportOutput("sample.bin",sample));
+  output.push_back(DivROMExportOutput("wave.bin",wave));
+  output.push_back(DivROMExportOutput("seq.bin",seq));
 
-  return ret;
+  logAppend("finished!");
+
+  running=false;
+}
+
+bool DivExportAmigaValidation::go(DivEngine* eng) {
+  e=eng;
+  running=true;
+  exportThread=new std::thread(&DivExportAmigaValidation::run,this);
+  return true;
+}
+
+void DivExportAmigaValidation::wait() {
+  if (exportThread!=NULL) {
+    exportThread->join();
+    delete exportThread;
+  }
+}
+
+void DivExportAmigaValidation::abort() {
+  wait();
+}
+
+bool DivExportAmigaValidation::isRunning() {
+  return running;
+}
+
+bool DivExportAmigaValidation::hasFailed() {
+  return false;
 }
diff --git a/src/engine/export/amigaValidation.h b/src/engine/export/amigaValidation.h
index 11a4ecd48..df8131652 100644
--- a/src/engine/export/amigaValidation.h
+++ b/src/engine/export/amigaValidation.h
@@ -19,8 +19,18 @@
 
 #include "../export.h"
 
+#include <thread>
+
 class DivExportAmigaValidation: public DivROMExport {
+  DivEngine* e;
+  std::thread* exportThread;
+  bool running;
+  void run();
   public:
-    std::vector<DivROMExportOutput> go(DivEngine* e);
+    bool go(DivEngine* e);
+    bool isRunning();
+    bool hasFailed();
+    void abort();
+    void wait();
     ~DivExportAmigaValidation() {}
 };
diff --git a/src/engine/tiunaOps.cpp b/src/engine/export/tiuna.cpp
similarity index 55%
rename from src/engine/tiunaOps.cpp
rename to src/engine/export/tiuna.cpp
index 942822cdb..397cee34f 100644
--- a/src/engine/tiunaOps.cpp
+++ b/src/engine/export/tiuna.cpp
@@ -17,62 +17,117 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include "tiuna.h"
+#include "../engine.h"
+#include "../ta-log.h"
+#include <fmt/printf.h>
 #include <algorithm>
 #include <map>
 #include <tuple>
 #include <vector>
-#include "engine.h"
-#include "../fileutils.h"
-#include "../ta-log.h"
 
 struct TiunaNew {
-  short pitch=-1;
-  signed char ins=-1;
-  signed char vol=-1;
-  short sync=-1;
+  short pitch;
+  signed char ins;
+  signed char vol;
+  short sync;
+  TiunaNew():
+    pitch(-1),
+    ins(-1),
+    vol(-1),
+    sync(-1) {}
 };
+
 struct TiunaLast {
-  short pitch=0;
-  signed char ins=0;
-  signed char vol=0;
-  int tick=1;
-  bool forcePitch=true;
+  short pitch;
+  signed char ins;
+  signed char vol;
+  int tick;
+  bool forcePitch;
+  TiunaLast():
+    pitch(0),
+    ins(0),
+    vol(0),
+    tick(1),
+    forcePitch(true) {}
 };
+
 struct TiunaCmd {
-  signed char pitchChange=-1;
-  short pitchSet=-1;
-  signed char ins=-1;
-  signed char vol=-1;
-  short sync=-1;
-  short wait=-1;
+  signed char pitchChange;
+  short pitchSet;
+  signed char ins;
+  signed char vol;
+  short sync;
+  short wait;
+  TiunaCmd():
+    pitchChange(-1),
+    pitchSet(-1),
+    ins(-1),
+    vol(-1),
+    sync(-1),
+    wait(-1) {}
 };
+
 struct TiunaBytes {
-  unsigned char ch=0;
-  int ticks=0;
-  unsigned char size=0;
+  unsigned char ch;
+  int ticks;
+  unsigned char size;
   unsigned char buf[16];
   friend bool operator==(const TiunaBytes& l, const TiunaBytes& r) {
     if (l.size!=r.size) return false;
     if (l.ticks!=r.ticks) return false;
     return memcmp(l.buf,r.buf,l.size)==0;
   }
+  TiunaBytes(unsigned char c, int t, unsigned char s, std::initializer_list<unsigned char> b):
+    ch(c),
+    ticks(t),
+    size(s) {
+    // because C++14 does not support data() on initializer_list
+    unsigned char p=0;
+    for (unsigned char i: b) {
+      buf[p++]=i;
+    }
+  }
+  TiunaBytes():
+    ch(0),
+    ticks(0),
+    size(0) {
+    memset(buf,0,16);
+  }
 };
+
 struct TiunaMatch {
   int pos;
   int endPos;
   int size;
   int id;
+  TiunaMatch(int p, int ep, int s, int _i):
+    pos(p),
+    endPos(ep),
+    size(s),
+    id(_i) {}
+  TiunaMatch():
+    pos(0),
+    endPos(0),
+    size(0),
+    id(0) {}
 };
+
 struct TiunaMatches {
-  int bytesSaved=INT32_MIN;
-  int length=0;
-  int ticks=0;
+  int bytesSaved;
+  int length;
+  int ticks;
   std::vector<int> pos;
+  TiunaMatches():
+    bytesSaved(INT32_MIN),
+    length(0),
+    ticks(0) {}
 };
 
 static void writeCmd(std::vector<TiunaBytes>& cmds, TiunaCmd& cmd, unsigned char ch, int& lastWait, int fromTick, int toTick) {
   while (fromTick<toTick) {
     int val=MIN(toTick-fromTick,256);
+    assert(val>0);
     if (lastWait!=val) {
       cmd.wait=val;
       lastWait=val;
@@ -126,140 +181,161 @@ static void writeCmd(std::vector<TiunaBytes>& cmds, TiunaCmd& cmd, unsigned char
   }
 }
 
-SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel, int firstBankSize, int otherBankSize) {
-  stop();
-  repeatPattern=false;
-  shallStop=false;
-  setOrder(0);
-  BUSY_BEGIN_SOFT;
-  // determine loop point
-  // bool stopped=false;
-  int loopOrder=0;
-  int loopOrderRow=0;
-  int loopEnd=0;
-  walkSong(loopOrder,loopOrderRow,loopEnd);
-  logI("loop point: %d %d",loopOrder,loopOrderRow);
-
-  SafeWriter* w=new SafeWriter;
-  w->init();
-
-  int tiaIdx=-1;
-
-  for (int i=0; i<song.systemLen; i++) {
-    if (sysToExport!=NULL && !sysToExport[i]) continue;
-    if (song.system[i]==DIV_SYSTEM_TIA) {
-      tiaIdx=i;
-      disCont[i].dispatch->toggleRegisterDump(true);
-      break;
-    }
-  }
-  if (tiaIdx<0) {
-    lastError="selected TIA system not found";
-    return NULL;
-  }
-
-  // write patterns
-  // bool writeLoop=false;
-  bool done=false;
-  playSub(false);
-  
+void DivExportTiuna::run() {
+  int loopOrder, loopOrderRow, loopEnd;
   int tick=0;
-  // int loopTick=-1;
-  TiunaLast last[2];
-  TiunaNew news[2];
+  SafeWriter* w;
   std::map<int,TiunaCmd> allCmds[2];
-  while (!done) {
-    // TODO implement loop
-    // if (loopTick<0 && loopOrder==curOrder && loopOrderRow==curRow
-    //   && (ticks-((tempoAccum+virtualTempoN)/virtualTempoD))<=0
-    // ) {
-    //   writeLoop=true;
-    //   loopTick=tick;
-    //   // invalidate last register state so it always force an absolute write after loop
-    //   for (int i=0; i<2; i++) {
-    //     last[i]=TiunaLast();
-    //     last[i].pitch=-1;
-    //     last[i].ins=-1;
-    //     last[i].vol=-1;
-    //   }
-    // }
-    if (nextTick(false,true) || !playing) {
-      // stopped=!playing;
-      done=true;
-      break;
-    }
-    for (int i=0; i<2; i++) {
-      news[i]=TiunaNew();
-    }
-    // get register dumps
-    std::vector<DivRegWrite>& writes=disCont[tiaIdx].dispatch->getRegisterWrites();
-    for (const DivRegWrite& i: writes) {
-      switch (i.addr) {
-        case 0xfffe0000:
-        case 0xfffe0001:
-          news[i.addr&1].pitch=i.val;
-          break;
-        case 0xfffe0002:
-          news[0].sync=i.val;
-          break;
-        case 0x15:
-        case 0x16:
-          news[i.addr-0x15].ins=i.val;
-          break;
-        case 0x19:
-        case 0x1a:
-          news[i.addr-0x19].vol=i.val;
-          break;
-        default: break;
-      }
-    }
-    writes.clear();
-    // collect changes
-    for (int i=0; i<2; i++) {
-      TiunaCmd cmds;
-      bool hasCmd=false;
-      if (news[i].pitch>=0 && (last[i].forcePitch || news[i].pitch!=last[i].pitch)) {
-        int dt=news[i].pitch-last[i].pitch;
-        if (!last[i].forcePitch && abs(dt)<=16) {
-          if (dt<0) cmds.pitchChange=15-dt;
-          else cmds.pitchChange=dt-1;
-        }
-        else cmds.pitchSet=news[i].pitch;
-        last[i].pitch=news[i].pitch;
-        last[i].forcePitch=false;
-        hasCmd=true;
-      }
-      if (news[i].ins>=0 && news[i].ins!=last[i].ins) {
-        cmds.ins=news[i].ins;
-        last[i].ins=news[i].ins;
-        hasCmd=true;
-      }
-      if (news[i].vol>=0 && news[i].vol!=last[i].vol) {
-        cmds.vol=(news[i].vol-last[i].vol)&0xf;
-        last[i].vol=news[i].vol;
-        hasCmd=true;
-      }
-      if (news[i].sync>=0) {
-        cmds.sync=news[i].sync;
-        hasCmd=true;
-      }
-      if (hasCmd) allCmds[i][tick]=cmds;
-    }
-    cmdStream.clear();
-    tick++;
-  }
-  for (int i=0; i<song.systemLen; i++) {
-    disCont[i].dispatch->getRegisterWrites().clear();
-    disCont[i].dispatch->toggleRegisterDump(false);
-  }
 
-  remainingLoops=-1;
-  playing=false;
-  freelance=false;
-  extValuePresent=false;
-  BUSY_END;
+  // config
+  String baseLabel=conf.getString("baseLabel","song");
+  int firstBankSize=conf.getInt("firstBankSize",3072);
+  int otherBankSize=conf.getInt("otherBankSize",4096-48);
+  int tiaIdx=conf.getInt("sysToExport",-1);
+
+  e->stop();
+  e->repeatPattern=false;
+  e->shallStop=false;
+  e->setOrder(0);
+  e->synchronizedSoft([&]() {
+    // determine loop point
+    // bool stopped=false;
+    loopOrder=0;
+    loopOrderRow=0;
+    loopEnd=0;
+    e->walkSong(loopOrder,loopOrderRow,loopEnd);
+    logAppendf("loop point: %d %d",loopOrder,loopOrderRow);
+
+    w=new SafeWriter;
+    w->init();
+
+    if (tiaIdx<0 || tiaIdx>=e->song.systemLen) {
+      tiaIdx=-1;
+      for (int i=0; i<e->song.systemLen; i++) {
+        if (e->song.system[i]==DIV_SYSTEM_TIA) {
+          tiaIdx=i;
+          break;
+        }
+      }
+      if (tiaIdx<0) {
+        logAppend("ERROR: selected TIA system not found");
+        failed=true;
+        running=false;
+        return;
+      }
+    } else if (e->song.system[tiaIdx]!=DIV_SYSTEM_TIA) {
+      logAppend("ERROR: selected chip is not a TIA!");
+      failed=true;
+      running=false;
+      return;
+    }
+
+    e->disCont[tiaIdx].dispatch->toggleRegisterDump(true);
+
+    // write patterns
+    // bool writeLoop=false;
+    logAppend("recording sequence...");
+    bool done=false;
+    e->playSub(false);
+    
+    // int loopTick=-1;
+    TiunaLast last[2];
+    TiunaNew news[2];
+    while (!done) {
+      // TODO implement loop
+      // if (loopTick<0 && loopOrder==curOrder && loopOrderRow==curRow
+      //   && (ticks-((tempoAccum+virtualTempoN)/virtualTempoD))<=0
+      // ) {
+      //   writeLoop=true;
+      //   loopTick=tick;
+      //   // invalidate last register state so it always force an absolute write after loop
+      //   for (int i=0; i<2; i++) {
+      //     last[i]=TiunaLast();
+      //     last[i].pitch=-1;
+      //     last[i].ins=-1;
+      //     last[i].vol=-1;
+      //   }
+      // }
+      if (e->nextTick(false,true) || !e->playing) {
+        // stopped=!playing;
+        done=true;
+        break;
+      }
+      for (int i=0; i<2; i++) {
+        news[i]=TiunaNew();
+      }
+      // get register dumps
+      std::vector<DivRegWrite>& writes=e->disCont[tiaIdx].dispatch->getRegisterWrites();
+      for (const DivRegWrite& i: writes) {
+        switch (i.addr) {
+          case 0xfffe0000:
+          case 0xfffe0001:
+            news[i.addr&1].pitch=i.val;
+            break;
+          case 0xfffe0002:
+            news[0].sync=i.val;
+            break;
+          case 0x15:
+          case 0x16:
+            news[i.addr-0x15].ins=i.val;
+            break;
+          case 0x19:
+          case 0x1a:
+            news[i.addr-0x19].vol=i.val;
+            break;
+          default: break;
+        }
+      }
+      writes.clear();
+      // collect changes
+      for (int i=0; i<2; i++) {
+        TiunaCmd cmds;
+        bool hasCmd=false;
+        if (news[i].pitch>=0 && (last[i].forcePitch || news[i].pitch!=last[i].pitch)) {
+          int dt=news[i].pitch-last[i].pitch;
+          if (!last[i].forcePitch && abs(dt)<=16) {
+            if (dt<0) cmds.pitchChange=15-dt;
+            else cmds.pitchChange=dt-1;
+          }
+          else cmds.pitchSet=news[i].pitch;
+          last[i].pitch=news[i].pitch;
+          last[i].forcePitch=false;
+          hasCmd=true;
+        }
+        if (news[i].ins>=0 && news[i].ins!=last[i].ins) {
+          cmds.ins=news[i].ins;
+          last[i].ins=news[i].ins;
+          hasCmd=true;
+        }
+        if (news[i].vol>=0 && news[i].vol!=last[i].vol) {
+          cmds.vol=(news[i].vol-last[i].vol)&0xf;
+          last[i].vol=news[i].vol;
+          hasCmd=true;
+        }
+        if (news[i].sync>=0) {
+          cmds.sync=news[i].sync;
+          hasCmd=true;
+        }
+        if (hasCmd) allCmds[i][tick]=cmds;
+      }
+      e->cmdStream.clear();
+      tick++;
+    }
+    for (int i=0; i<e->song.systemLen; i++) {
+      e->disCont[i].dispatch->getRegisterWrites().clear();
+      e->disCont[i].dispatch->toggleRegisterDump(false);
+    }
+
+    e->remainingLoops=-1;
+    e->playing=false;
+    e->freelance=false;
+    e->extValuePresent=false;
+  });
+
+  if (failed) return;
 
   // render commands
+  logAppend("rendering commands...");
   std::vector<TiunaBytes> renderedCmds;
   w->writeText(fmt::format(
     "; Generated by Furnace " DIV_VERSION "\n"
@@ -267,7 +343,7 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
     "; Author: {}\n"
     "; Album:  {}\n"
     "; Subsong #{}: {}\n\n",
-    song.name,song.author,song.category,curSubSongIndex+1,curSubSong->name
+    e->song.name,e->song.author,e->song.category,e->curSubSongIndex+1,e->curSubSong->name
   ));
   for (int i=0; i<2; i++) {
     TiunaCmd lastCmd;
@@ -293,17 +369,37 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
   std::vector<int> callTicks;
   int cmId=0;
   int cmdSize=renderedCmds.size();
-  std::vector<bool> processed=std::vector<bool>(cmdSize,false);
-  while (firstBankSize>768 && cmId<(MAX(firstBankSize/1024,1))*256) {
+  bool* processed=new bool[cmdSize];
+  memset(processed,0,cmdSize*sizeof(bool));
+  logAppend("compressing! this may take a while.");
+  int maxCmId=(MAX(firstBankSize/1024,1))*256;
+  int lastMaxPMVal=100000;
+  logAppendf("max cmId: %d",maxCmId);
+  logAppendf("commands: %d",cmdSize);
+  while (firstBankSize>768 && cmId<maxCmId) {
+    if (mustAbort) {
+      logAppend("aborted!");
+      failed=true;
+      running=false;
+      delete[] processed;
+      return;
+    }
+
+    float theOtherSide=pow(1.0/float(MAX(1,lastMaxPMVal)),0.2)*0.98;
+    progress[0].amount=theOtherSide+(1.0-theOtherSide)*((float)cmId/(float)maxCmId);
+
+    logAppendf("start CM %04x...",cmId);
     std::map<int,TiunaMatches> potentialMatches;
     for (int i=0; i<cmdSize-1;) {
       // continue and skip if it's part of previous confirmed matches
       while (i<cmdSize-1 && processed[i]) i++;
       if (i>=cmdSize-1) break;
+      progress[1].amount=(float)i/(float)(cmdSize-1);
       std::vector<TiunaMatch> match;
       int ch=renderedCmds[i].ch;
       for (int j=i+1; j<cmdSize;) {
-        while (j<cmdSize && processed[i]) j++;
+        if (processed[i]) break;
+        //while (j<cmdSize && processed[i]) j++;
         if (j>=cmdSize) break;
         int k=0;
         int ticks=0;
@@ -322,7 +418,7 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
           size+=renderedCmds[i+k].size;
           k++;
         }
-        if (size>2) match.push_back({j,j+k,size,0});
+        if (size>2) match.push_back(TiunaMatch(j,j+k,size,0));
         if (k==0) k++;
         j+=k;
       }
@@ -367,7 +463,10 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
       }
       i++;
     }
-    if (potentialMatches.empty()) break;
+    if (potentialMatches.empty()) {
+      logAppend("potentialMatches is empty");
+      break;
+    }
     int maxPMIdx=0;
     int maxPMVal=0;
     for (const auto& i: potentialMatches) {
@@ -379,12 +478,18 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
     int maxPMLen=potentialMatches[maxPMIdx].length;
     for (const int i: potentialMatches[maxPMIdx].pos) {
       confirmedMatches.push_back({i,i+maxPMLen,0,cmId});
-      std::fill(processed.begin()+i,processed.begin()+(i+maxPMLen),true);
+      memset(processed+i,1,maxPMLen);
+      //std::fill(processed.begin()+i,processed.begin()+(i+maxPMLen),true);
     }
     callTicks.push_back(potentialMatches[maxPMIdx].ticks);
-    logI("CM %04x added: pos=%d,len=%d,matches=%d,saved=%d",cmId,maxPMIdx,maxPMLen,potentialMatches[maxPMIdx].pos.size(),maxPMVal);
+    logAppendf("CM %04x added: pos=%d,len=%d,matches=%d,saved=%d",cmId,maxPMIdx,maxPMLen,potentialMatches[maxPMIdx].pos.size(),maxPMVal);
+    lastMaxPMVal=maxPMVal;
     cmId++;
   }
+  progress[0].amount=1.0f;
+  progress[1].amount=1.0f;
+  logAppend("generating data...");
+  delete[] processed;
   std::sort(confirmedMatches.begin(),confirmedMatches.end(),[](const TiunaMatch& l, const TiunaMatch& r){
     return l.pos<r.pos;
   });
@@ -394,8 +499,10 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
   // overlap check
   for (int i=1; i<(int)confirmedMatches.size(); i++) {
     if (confirmedMatches[i-1].endPos<=confirmedMatches[i].pos) continue;
-    lastError="impossible overlap found in matches list, please report";
-    return NULL;
+    logAppend("ERROR: impossible overlap found in matches list, please report");
+    failed=true;
+    running=false;
+    return;
   }
   SafeWriter dbg;
   dbg.init();
@@ -444,8 +551,10 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
   }
   w->writeC('\n');
   if (totalSize>firstBankSize) {
-    lastError="first bank is not large enough to contain call table";
-    return NULL;
+    logAppend("ERROR: first bank is not large enough to contain call table");
+    failed=true;
+    running=false;
+    return;
   }
 
   int curBank=0;
@@ -462,7 +571,7 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
         if (callVisited[cmIter->id]) {
           unsigned char idLo=cmIter->id&0xff;
           unsigned char idHi=cmIter->id>>8;
-          cmd={cmd.ch,0,2,{idHi,idLo}};
+          cmd=TiunaBytes(cmd.ch,0,2,{idHi,idLo});
           i=cmIter->endPos-1;
         } else {
           writeCall=cmIter->id;
@@ -506,13 +615,50 @@ SafeWriter* DivEngine::saveTiuna(const bool* sysToExport, const char* baseLabel,
   }
   w->writeText("    .text x\"e0\"\n    .endsection\n");
   totalSize++;
-  logI("total size: %d bytes (%d banks)",totalSize,curBank+1);
-  
-  FILE* f=ps_fopen("confirmedMatches.txt","wb");
-  if (f!=NULL) {
-    fwrite(dbg.getFinalBuf(),1,dbg.size(),f);
-    fclose(f);
-  }
+  logAppendf("total size: %d bytes (%d banks)",totalSize,curBank+1);
 
-  return w;
+  output.push_back(DivROMExportOutput("export.asm",w));
+  
+  logAppend("finished!");
+
+  running=false;
+}
+
+bool DivExportTiuna::go(DivEngine* eng) {
+  progress[0].name="Compression";
+  progress[0].amount=0.0f;
+  progress[1].name="Confirmed Matches";
+  progress[1].amount=0.0f;
+
+  e=eng;
+  running=true;
+  failed=false;
+  mustAbort=false;
+  exportThread=new std::thread(&DivExportTiuna::run,this);
+  return true;
+}
+
+void DivExportTiuna::wait() {
+  if (exportThread!=NULL) {
+    exportThread->join();
+    delete exportThread;
+  }
+}
+
+void DivExportTiuna::abort() {
+  mustAbort=true;
+  wait();
+}
+
+bool DivExportTiuna::isRunning() {
+  return running;
+}
+
+bool DivExportTiuna::hasFailed() {
+  return failed;
+}
+
+DivROMExportProgress DivExportTiuna::getProgress(int index) {
+  if (index<0 || index>2) return progress[2];
+  return progress[index];
 }
diff --git a/src/engine/export/tiuna.h b/src/engine/export/tiuna.h
new file mode 100644
index 000000000..ae1a661a9
--- /dev/null
+++ b/src/engine/export/tiuna.h
@@ -0,0 +1,38 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2024 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "../export.h"
+
+#include <thread>
+
+class DivExportTiuna: public DivROMExport {
+  DivEngine* e;
+  std::thread* exportThread;
+  DivROMExportProgress progress[3];
+  bool running, failed, mustAbort;
+  void run();
+  public:
+    bool go(DivEngine* e);
+    bool isRunning();
+    bool hasFailed();
+    void abort();
+    void wait();
+    DivROMExportProgress getProgress(int index=0);
+    ~DivExportTiuna() {}
+};
diff --git a/src/engine/exportDef.cpp b/src/engine/exportDef.cpp
new file mode 100644
index 000000000..00ee94a36
--- /dev/null
+++ b/src/engine/exportDef.cpp
@@ -0,0 +1,63 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2024 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "engine.h"
+
+DivROMExportDef* DivEngine::romExportDefs[DIV_ROM_MAX];
+
+const DivROMExportDef* DivEngine::getROMExportDef(DivROMExportOptions opt) {
+  return romExportDefs[opt];
+}
+
+void DivEngine::registerROMExports() {
+  logD("registering ROM exports...");
+
+  romExportDefs[DIV_ROM_AMIGA_VALIDATION]=new DivROMExportDef(
+    "Amiga Validation", "tildearrow",
+    "a test export for ensuring Amiga emulation is accurate. do not use!",
+    NULL, NULL,
+    {DIV_SYSTEM_AMIGA},
+    true, DIV_REQPOL_EXACT
+  );
+
+  romExportDefs[DIV_ROM_ZSM]=new DivROMExportDef(
+    "Commander X16 ZSM", "ZeroByteOrg and MooingLemur",
+    "Commander X16 Zsound Music File.\n"
+    "for use with Melodius, Calliope and/or ZSMKit:\n"
+    "- https://github.com/mooinglemur/zsmkit (development)\n"
+    "- https://github.com/mooinglemur/melodius (player)\n"
+    "- https://github.com/ZeroByteOrg/calliope (player)\n",
+    "ZSM file", ".zsm",
+    {
+      DIV_SYSTEM_YM2151, DIV_SYSTEM_VERA
+    },
+    false, DIV_REQPOL_LAX
+  );
+
+  romExportDefs[DIV_ROM_TIUNA]=new DivROMExportDef(
+    "Atari 2600 (TIunA)", "Natt Akuma",
+    "advanced driver with software tuning support.\n"
+    "see https://github.com/AYCEdemo/twin-tiuna for code.",
+    "assembly files", ".asm",
+    {
+      DIV_SYSTEM_TIA
+    },
+    false, DIV_REQPOL_ANY
+  );
+}
diff --git a/src/engine/fileOps/fur.cpp b/src/engine/fileOps/fur.cpp
index 0251c410e..5483d8fb9 100644
--- a/src/engine/fileOps/fur.cpp
+++ b/src/engine/fileOps/fur.cpp
@@ -2094,6 +2094,12 @@ bool DivEngine::loadFur(unsigned char* file, size_t len, int variantID) {
           ds.systemFlags[i].set("oldPitch",true);
         }
       }
+    } else if (ds.version<217) {
+      for (int i=0; i<ds.systemLen; i++) {
+        if (ds.system[i]==DIV_SYSTEM_VERA) {
+          ds.systemFlags[i].set("chipType",1);
+        }
+      }
     }
 
     if (active) quitDispatch();
diff --git a/src/engine/platform/gb.cpp b/src/engine/platform/gb.cpp
index 57860b97a..8c648612a 100644
--- a/src/engine/platform/gb.cpp
+++ b/src/engine/platform/gb.cpp
@@ -651,7 +651,7 @@ void DivPlatformGB::reset() {
   immWrite(0x26,0x8f);
   lastPan=0xff;
   immWrite(0x25,procMute());
-  immWrite(0x24,0x77);
+  immWrite(0x24,0xff);
 
   antiClickPeriodCount=0;
   antiClickWavePos=0;
diff --git a/src/engine/platform/msm6295.cpp b/src/engine/platform/msm6295.cpp
index 916234f0e..6b40575b9 100644
--- a/src/engine/platform/msm6295.cpp
+++ b/src/engine/platform/msm6295.cpp
@@ -39,14 +39,25 @@ const char** DivPlatformMSM6295::getRegisterSheet() {
 }
 
 u8 DivPlatformMSM6295::read_byte(u32 address) {
-  if (adpcmMem==NULL || address>=getSampleMemCapacity(0)) {
+  if (adpcmMem==NULL) {
     return 0;
   }
   if (isBanked) {
     if (address<0x400) {
-      return adpcmMem[(bank[(address>>8)&0x3]<<16)|(address&0x3ff)];
+      unsigned int bankedAddress=(bank[(address>>8)&0x3]<<16)|(address&0x3ff);
+      if (bankedAddress>=getSampleMemCapacity(0)) {
+        return 0;
+      }
+      return adpcmMem[bankedAddress&0xffffff];
     }
-    return adpcmMem[(bank[(address>>16)&0x3]<<16)|(address&0xffff)];
+    unsigned int bankedAddress=(bank[(address>>16)&0x3]<<16)|(address&0xffff);
+    if (bankedAddress>=getSampleMemCapacity(0)) {
+      return 0;
+    }
+    return adpcmMem[bankedAddress&0xffffff];
+  }
+  if (address>=getSampleMemCapacity(0)) {
+    return 0;
   }
   return adpcmMem[address&0x3ffff];
 }
diff --git a/src/engine/platform/sound/vera_psg.c b/src/engine/platform/sound/vera_psg.c
index be080ace9..597aa5974 100644
--- a/src/engine/platform/sound/vera_psg.c
+++ b/src/engine/platform/sound/vera_psg.c
@@ -5,6 +5,7 @@
 // Chip revisions
 // 0: V  0.3.0
 // 1: V 47.0.0 (9-bit volume, phase reset on mute)
+// 2: V 47.0.2 (Pulse Width XOR on Saw and Triangle)
 
 #include "vera_psg.h"
 
@@ -88,8 +89,8 @@ render(struct VERA_PSG* psg, int16_t *left, int16_t *right)
 		uint8_t v = 0;
 		switch (ch->waveform) {
 			case WF_PULSE: v = (ch->phase >> 10) > ch->pw ? 0 : 63; break;
-			case WF_SAWTOOTH: v = ch->phase >> 11; break;
-			case WF_TRIANGLE: v = (ch->phase & 0x10000) ? (~(ch->phase >> 10) & 0x3F) : ((ch->phase >> 10) & 0x3F); break;
+			case WF_SAWTOOTH: v = (ch->phase >> 11) ^ (psg->chipType < 2 ? 0 : (ch->pw ^ 0x3f) & 0x3f); break;
+			case WF_TRIANGLE: v = ((ch->phase & 0x10000) ? (~(ch->phase >> 10) & 0x3F) : ((ch->phase >> 10) & 0x3F)) ^ (psg->chipType < 2 ? 0 : (ch->pw ^ 0x3f) & 0x3f); break;
 			case WF_NOISE: v = ch->noiseval; break;
 		}
 		int8_t sv = (v ^ 0x20);
diff --git a/src/engine/platform/vera.cpp b/src/engine/platform/vera.cpp
index e4e78933e..b6b7cf831 100644
--- a/src/engine/platform/vera.cpp
+++ b/src/engine/platform/vera.cpp
@@ -532,7 +532,7 @@ void DivPlatformVERA::poke(std::vector<DivRegWrite>& wlist) {
 }
 
 void DivPlatformVERA::setFlags(const DivConfig& flags) {
-  psg->chipType=flags.getInt("chipType",1);
+  psg->chipType=flags.getInt("chipType",2);
   chipClock=25000000;
   CHECK_CUSTOM_CLOCK;
   rate=chipClock/512;
diff --git a/src/engine/zsm.cpp b/src/engine/zsm.cpp
index 87dbde8d2..75cc3d9da 100644
--- a/src/engine/zsm.cpp
+++ b/src/engine/zsm.cpp
@@ -133,14 +133,6 @@ void DivZSM::writePSG(unsigned char a, unsigned char v) {
   } else if (a>=64) {
     return writePCM(a-64,v);
   }
-  if (optimize) {
-    if ((a&3)==3 && v>64) {
-      // Pulse width on non-pulse waves is nonsense and wasteful
-      // No need to preserve state here because the next write that
-      // selects pulse will also set the pulse width in this register
-      v&=0xc0;
-    }
-  }
   if (psgState[psg_PREV][a]==v) {
     if (psgState[psg_NEW][a]!=v) {
       // NEW value is being reset to the same as PREV value
diff --git a/src/gui/about.cpp b/src/gui/about.cpp
index f3a31038b..eb4b06753 100644
--- a/src/gui/about.cpp
+++ b/src/gui/about.cpp
@@ -94,6 +94,7 @@ const char* aboutLine[]={
   "battybeats",
   "bbqzzd",
   "Bernie",
+  "billimanmcjonnson",
   "BlastBrothers",
   "Blaze Weednix",
   "BlueElectric05",
@@ -147,6 +148,7 @@ const char* aboutLine[]={
   "MelonadeM",
   "Miker",
   "Molkirill",
+  "MrCoolDude",
   "NeoWar",
   "Nerreave",
   "niffuM",
@@ -158,6 +160,7 @@ const char* aboutLine[]={
   "Pale Moon",
   "PeyPey",
   "PichuMario",
+  "pixelated",
   "Poltvick",
   "PotaJoe",
   "potatoTeto",
@@ -177,6 +180,7 @@ const char* aboutLine[]={
   "Slightly Large NC",
   "smaybius",
   "SnugglyBun",
+  "Someone64",
   "Spinning Square Waves",
   "src3453",
   "SuperJet Spade",
diff --git a/src/gui/editControls.cpp b/src/gui/editControls.cpp
index 5527f5598..3eba0298c 100644
--- a/src/gui/editControls.cpp
+++ b/src/gui/editControls.cpp
@@ -619,41 +619,6 @@ void FurnaceGUI::drawMobileControls() {
         if (ImGui::Button(_("Switch to Desktop Mode"))) {
           toggleMobileUI(!mobileUI);
         }
-
-        int numAmiga=0;
-        for (int i=0; i<e->song.systemLen; i++) {
-          if (e->song.system[i]==DIV_SYSTEM_AMIGA) numAmiga++;
-        }
-
-        if (numAmiga) {
-          ImGui::Text(_(
-            "this is NOT ROM export! only use for making sure the\n"
-            "Furnace Amiga emulator is working properly by\n"
-            "comparing it with real Amiga output."
-          ));
-          ImGui::AlignTextToFramePadding();
-          ImGui::Text(_("Directory"));
-          ImGui::SameLine();
-          ImGui::InputText("##AVDPath",&workingDirROMExport);
-          if (ImGui::Button(_("Bake Data"))) {
-            std::vector<DivROMExportOutput> out=e->buildROM(DIV_ROM_AMIGA_VALIDATION);
-            if (workingDirROMExport.size()>0) {
-              if (workingDirROMExport[workingDirROMExport.size()-1]!=DIR_SEPARATOR) workingDirROMExport+=DIR_SEPARATOR_STR;
-            }
-            for (DivROMExportOutput& i: out) {
-              String path=workingDirROMExport+i.name;
-              FILE* outFile=ps_fopen(path.c_str(),"wb");
-              if (outFile!=NULL) {
-                fwrite(i.data->getFinalBuf(),1,i.data->size(),outFile);
-                fclose(outFile);
-              }
-              i.data->finish();
-              delete i.data;
-            }
-            showError(fmt::sprintf(_("Done! Baked %d files."),(int)out.size()));
-          }
-        }
-
         break;
       }
     }
diff --git a/src/gui/exportOptions.cpp b/src/gui/exportOptions.cpp
index 357ef8002..aca5523f0 100644
--- a/src/gui/exportOptions.cpp
+++ b/src/gui/exportOptions.cpp
@@ -87,6 +87,18 @@ void FurnaceGUI::drawExportAudio(bool onWindow) {
       }
     }
     ImGui::SameLine();
+    if (ImGui::SmallButton(_("Shown in pattern"))) {
+      for (int i=0; i<DIV_MAX_CHANS; i++) {
+        audioExportOptions.channelMask[i]=e->curSubSong->chanShow[i];
+      }
+    }
+    ImGui::SameLine();
+    if (ImGui::SmallButton(_("Shown in oscilloscope"))) {
+      for (int i=0; i<DIV_MAX_CHANS; i++) {
+        audioExportOptions.channelMask[i]=e->curSubSong->chanShowChanOsc[i];
+      }
+    }
+    ImGui::SameLine();
     if (ImGui::SmallButton(_("Invert"))) {
       for (int i=0; i<DIV_MAX_CHANS; i++) {
         audioExportOptions.channelMask[i]=!audioExportOptions.channelMask[i];
@@ -227,6 +239,105 @@ void FurnaceGUI::drawExportVGM(bool onWindow) {
   }
 }
 
+void FurnaceGUI::drawExportROM(bool onWindow) {
+  exitDisabledTimer=1;
+
+  const DivROMExportDef* def=e->getROMExportDef(romTarget);
+
+  ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
+  if (ImGui::BeginCombo("##ROMTarget",def==NULL?"<select one>":def->name)) {
+    for (int i=0; i<DIV_ROM_MAX; i++) {
+      const DivROMExportDef* newDef=e->getROMExportDef((DivROMExportOptions)i);
+      if (newDef!=NULL) {
+        if (ImGui::Selectable(newDef->name)) {
+          romTarget=(DivROMExportOptions)i;
+          romMultiFile=newDef->multiOutput;
+          romConfig=DivConfig();
+          if (newDef->fileExt==NULL) {
+            romFilterName="";
+            romFilterExt="";
+          } else {
+            romFilterName=newDef->fileType;
+            romFilterExt=newDef->fileExt;
+          }
+        }
+      }
+    }
+    ImGui::EndCombo();
+  }
+
+  if (def!=NULL) {
+    ImGui::Text("by %s",def->author);
+
+    ImGui::TextWrapped("%s",def->description);
+  }
+
+  ImGui::Separator();
+
+  bool altered=false;
+
+  switch (romTarget) {
+    case DIV_ROM_TIUNA: {
+      String asmBaseLabel=romConfig.getString("baseLabel","song");
+      int firstBankSize=romConfig.getInt("firstBankSize",3072);
+      int otherBankSize=romConfig.getInt("otherBankSize",4096-48);
+      int sysToExport=romConfig.getInt("sysToExport",-1);
+
+      // TODO; validate label
+      if (ImGui::InputText(_("base song label name"),&asmBaseLabel)) {
+        altered=true;
+      }
+      if (ImGui::InputInt(_("max size in first bank"),&firstBankSize,1,100)) {
+        if (firstBankSize<0) firstBankSize=0;
+        if (firstBankSize>4096) firstBankSize=4096;
+        altered=true;
+      }
+      if (ImGui::InputInt(_("max size in other banks"),&otherBankSize,1,100)) {
+        if (otherBankSize<16) otherBankSize=16;
+        if (otherBankSize>4096) otherBankSize=4096;
+        altered=true;
+      }
+      
+      ImGui::Text(_("chip to export:"));
+      for (int i=0; i<e->song.systemLen; i++) {
+        DivSystem sys=e->song.system[i];
+        bool isTIA=(sys==DIV_SYSTEM_TIA);
+        ImGui::BeginDisabled(!isTIA);
+        if (ImGui::RadioButton(fmt::sprintf("%d. %s##_SYSV%d",i+1,getSystemName(e->song.system[i]),i).c_str(),sysToExport==i)) {
+          sysToExport=i;
+          altered=true;
+        }
+        ImGui::EndDisabled();
+      }
+      if (altered) {
+        romConfig.set("baseLabel",asmBaseLabel);
+        romConfig.set("firstBankSize",firstBankSize);
+        romConfig.set("otherBankSize",otherBankSize);
+        romConfig.set("sysToExport",sysToExport);
+      }
+      break;
+    }
+    case DIV_ROM_ABSTRACT:
+      ImGui::TextWrapped("%s",_("select a target from the menu at the top of this dialog."));
+      break;
+    default:
+      ImGui::TextWrapped("%s",_("this export method doesn't offer any options."));
+      break;
+  }
+  /*
+  */
+
+  if (onWindow) {
+    ImGui::Separator();
+    if (ImGui::Button(_("Cancel"),ImVec2(200.0f*dpiScale,0))) ImGui::CloseCurrentPopup();
+    ImGui::SameLine();
+  }
+  if (ImGui::Button(_("Export"),ImVec2(200.0f*dpiScale,0))) {
+    openFileDialog(GUI_FILE_EXPORT_ROM);
+    ImGui::CloseCurrentPopup();
+  }
+}
+
 void FurnaceGUI::drawExportZSM(bool onWindow) {
   exitDisabledTimer=1;
 
@@ -249,93 +360,6 @@ void FurnaceGUI::drawExportZSM(bool onWindow) {
   }
 }
 
-void FurnaceGUI::drawExportTiuna(bool onWindow) {
-  exitDisabledTimer=1;
-
-  ImGui::Text(_("for use with TIunA driver. outputs asm source."));
-  ImGui::InputText(_("base song label name"),&asmBaseLabel); // TODO: validate label
-  if (ImGui::InputInt(_("max size in first bank"),&tiunaFirstBankSize,1,100)) {
-    if (tiunaFirstBankSize<0) tiunaFirstBankSize=0;
-    if (tiunaFirstBankSize>4096) tiunaFirstBankSize=4096;
-  }
-  if (ImGui::InputInt(_("max size in other banks"),&tiunaOtherBankSize,1,100)) {
-    if (tiunaOtherBankSize<16) tiunaOtherBankSize=16;
-    if (tiunaOtherBankSize>4096) tiunaOtherBankSize=4096;
-  }
-  
-  ImGui::Text(_("chips to export:"));
-  int selected=0;
-  for (int i=0; i<e->song.systemLen; i++) {
-    DivSystem sys=e->song.system[i];
-    bool isTIA=sys==DIV_SYSTEM_TIA;
-    ImGui::BeginDisabled((!isTIA) || (selected>=1));
-    ImGui::Checkbox(fmt::sprintf("%d. %s##_SYSV%d",i+1,getSystemName(e->song.system[i]),i).c_str(),&willExport[i]);
-    ImGui::EndDisabled();
-    if (ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled)) {
-      if (!isTIA) {
-        ImGui::SetTooltip(_("this chip is not supported by the file format!"));
-      } else if (selected>=1) {
-        ImGui::SetTooltip(_("only one Atari TIA is supported!"));
-      }
-    }
-    if (isTIA && willExport[i]) selected++;
-  }
-  if (selected>0) {
-    if (onWindow) {
-      ImGui::Separator();
-      if (ImGui::Button(_("Cancel"),ImVec2(200.0f*dpiScale,0))) ImGui::CloseCurrentPopup();
-      ImGui::SameLine();
-    }
-    if (ImGui::Button(_("Export"),ImVec2(200.0f*dpiScale,0))) {
-      openFileDialog(GUI_FILE_EXPORT_TIUNA);
-      ImGui::CloseCurrentPopup();
-    }
-  } else {
-    ImGui::Text(_("nothing to export"));
-    if (onWindow) {
-      ImGui::Separator();
-      if (ImGui::Button(_("Cancel"),ImVec2(400.0f*dpiScale,0))) ImGui::CloseCurrentPopup();
-    }
-  }
-}
-
-void FurnaceGUI::drawExportAmigaVal(bool onWindow) {
-  exitDisabledTimer=1;
-
-  ImGui::Text(_(
-    "this is NOT ROM export! only use for making sure the\n"
-    "Furnace Amiga emulator is working properly by\n"
-    "comparing it with real Amiga output."
-  ));
-  ImGui::AlignTextToFramePadding();
-  ImGui::Text(_("Directory"));
-  ImGui::SameLine();
-  ImGui::InputText("##AVDPath",&workingDirROMExport);
-  if (onWindow) {
-    ImGui::Separator();
-    if (ImGui::Button(_("Cancel"),ImVec2(200.0f*dpiScale,0))) ImGui::CloseCurrentPopup();
-    ImGui::SameLine();
-  }
-  if (ImGui::Button(_("Bake Data"),ImVec2(200.0f*dpiScale,0))) {
-    std::vector<DivROMExportOutput> out=e->buildROM(DIV_ROM_AMIGA_VALIDATION);
-    if (workingDirROMExport.size()>0) {
-      if (workingDirROMExport[workingDirROMExport.size()-1]!=DIR_SEPARATOR) workingDirROMExport+=DIR_SEPARATOR_STR;
-    }
-    for (DivROMExportOutput& i: out) {
-      String path=workingDirROMExport+i.name;
-      FILE* outFile=ps_fopen(path.c_str(),"wb");
-      if (outFile!=NULL) {
-        fwrite(i.data->getFinalBuf(),1,i.data->size(),outFile);
-        fclose(outFile);
-      }
-      i.data->finish();
-      delete i.data;
-    }
-    showError(fmt::sprintf(_("Done! Baked %d files."),(int)out.size()));
-    ImGui::CloseCurrentPopup();
-  }
-}
-
 void FurnaceGUI::drawExportText(bool onWindow) {
   exitDisabledTimer=1;
 
@@ -412,6 +436,10 @@ void FurnaceGUI::drawExport() {
         drawExportVGM(true);
         ImGui::EndTabItem();
       }
+      if (ImGui::BeginTabItem(_("ROM"))) {
+        drawExportROM(true);
+        ImGui::EndTabItem();
+      }
       int numZSMCompat=0;
       for (int i=0; i<e->song.systemLen; i++) {
         if ((e->song.system[i]==DIV_SYSTEM_VERA) || (e->song.system[i]==DIV_SYSTEM_YM2151)) numZSMCompat++;
@@ -422,29 +450,6 @@ void FurnaceGUI::drawExport() {
           ImGui::EndTabItem();
         }
       }
-      bool hasTiunaCompat=false;
-      for (int i=0; i<e->song.systemLen; i++) {
-        if (e->song.system[i]==DIV_SYSTEM_TIA) {
-          hasTiunaCompat=true;
-          break;
-        }
-      }
-      if (hasTiunaCompat) {
-        if (ImGui::BeginTabItem("TIunA")) {
-          drawExportTiuna(true);
-          ImGui::EndTabItem();
-        }
-      }
-      int numAmiga=0;
-      for (int i=0; i<e->song.systemLen; i++) {
-        if (e->song.system[i]==DIV_SYSTEM_AMIGA) numAmiga++;
-      }
-      if (numAmiga && settings.iCannotWait) {
-        if (ImGui::BeginTabItem(_("Amiga Validation"))) {
-          drawExportAmigaVal(true);
-          ImGui::EndTabItem();
-        }
-      }
       if (ImGui::BeginTabItem(_("Text"))) {
         drawExportText(true);
         ImGui::EndTabItem();
@@ -466,15 +471,12 @@ void FurnaceGUI::drawExport() {
     case GUI_EXPORT_VGM:
       drawExportVGM(true);
       break;
+    case GUI_EXPORT_ROM:
+      drawExportROM(true);
+      break;
     case GUI_EXPORT_ZSM:
       drawExportZSM(true);
       break;
-    case GUI_EXPORT_TIUNA:
-      drawExportTiuna(true);
-      break;
-    case GUI_EXPORT_AMIGA_VAL:
-      drawExportAmigaVal(true);
-      break;
     case GUI_EXPORT_TEXT:
       drawExportText(true);
       break;
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 3ba5e2705..45d71e95f 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -1950,15 +1950,6 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
         (settings.autoFillSave)?shortName:""
       );
       break;
-    case GUI_FILE_EXPORT_TIUNA:
-      if (!dirExists(workingDirROMExport)) workingDirROMExport=getHomeDir();
-      hasOpened=fileDialog->openSave(
-        "Export TIunA",
-        {"assembly files", "*.asm"},
-        workingDirROMExport,
-        dpiScale
-      );
-      break;
     case GUI_FILE_EXPORT_TEXT:
       if (!dirExists(workingDirROMExport)) workingDirROMExport=getHomeDir();
       hasOpened=fileDialog->openSave(
@@ -1980,7 +1971,22 @@ void FurnaceGUI::openFileDialog(FurnaceGUIFileDialogs type) {
       );
       break;
     case GUI_FILE_EXPORT_ROM:
-      showError(_("Coming soon!"));
+      if (!dirExists(workingDirROMExport)) workingDirROMExport=getHomeDir();
+      if (romMultiFile) {
+        hasOpened=fileDialog->openSelectDir(
+          _("Export ROM"),
+          workingDirROMExport,
+          dpiScale
+        );
+      } else {
+        hasOpened=fileDialog->openSave(
+          _("Export ROM"),
+          {romFilterName, "*"+romFilterExt},
+          workingDirROMExport,
+          dpiScale,
+          (settings.autoFillSave)?shortName:""
+        );
+      }
       break;
     case GUI_FILE_LOAD_MAIN_FONT:
       if (!dirExists(workingDirFont)) workingDirFont=getHomeDir();
@@ -4295,6 +4301,10 @@ bool FurnaceGUI::loop() {
             drawExportVGM();
             ImGui::EndMenu();
           }
+          if (ImGui::BeginMenu(_("export ROM..."))) {
+            drawExportROM();
+            ImGui::EndMenu();
+          }
           int numZSMCompat=0;
           for (int i=0; i<e->song.systemLen; i++) {
             if ((e->song.system[i]==DIV_SYSTEM_VERA) || (e->song.system[i]==DIV_SYSTEM_YM2151)) numZSMCompat++;
@@ -4305,29 +4315,6 @@ bool FurnaceGUI::loop() {
               ImGui::EndMenu();
             }
           }
-          bool hasTiunaCompat=false;
-          for (int i=0; i<e->song.systemLen; i++) {
-            if (e->song.system[i]==DIV_SYSTEM_TIA) {
-              hasTiunaCompat=true;
-              break;
-            }
-          }
-          if (hasTiunaCompat) {
-            if (ImGui::BeginMenu(_("export TIunA..."))) {
-              drawExportTiuna();
-              ImGui::EndMenu();
-            }
-          }
-          int numAmiga=0;
-          for (int i=0; i<e->song.systemLen; i++) {
-            if (e->song.system[i]==DIV_SYSTEM_AMIGA) numAmiga++;
-          }
-          if (numAmiga && settings.iCannotWait) {
-            if (ImGui::BeginMenu(_("export Amiga validation data..."))) {
-              drawExportAmigaVal();
-              ImGui::EndMenu();
-            }
-          }
           if (ImGui::BeginMenu(_("export text..."))) {
             drawExportText();
             ImGui::EndMenu();
@@ -4349,6 +4336,10 @@ bool FurnaceGUI::loop() {
             curExportType=GUI_EXPORT_VGM;
             displayExport=true;
           }
+          if (ImGui::MenuItem(_("export ROM..."))) {
+            curExportType=GUI_EXPORT_ROM;
+            displayExport=true;
+          }
           int numZSMCompat=0;
           for (int i=0; i<e->song.systemLen; i++) {
             if ((e->song.system[i]==DIV_SYSTEM_VERA) || (e->song.system[i]==DIV_SYSTEM_YM2151)) numZSMCompat++;
@@ -4359,29 +4350,6 @@ bool FurnaceGUI::loop() {
               displayExport=true;
             }
           }
-          bool hasTiunaCompat=false;
-          for (int i=0; i<e->song.systemLen; i++) {
-            if (e->song.system[i]==DIV_SYSTEM_TIA) {
-              hasTiunaCompat=true;
-              break;
-            }
-          }
-          if (hasTiunaCompat) {
-            if (ImGui::MenuItem(_("export TIunA..."))) {
-              curExportType=GUI_EXPORT_TIUNA;
-              displayExport=true;
-            }
-          }
-          int numAmiga=0;
-          for (int i=0; i<e->song.systemLen; i++) {
-            if (e->song.system[i]==DIV_SYSTEM_AMIGA) numAmiga++;
-          }
-          if (numAmiga && settings.iCannotWait) {
-            if (ImGui::MenuItem(_("export Amiga validation data..."))) {
-              curExportType=GUI_EXPORT_AMIGA_VAL;
-              displayExport=true;
-            }
-          }
           if (ImGui::MenuItem(_("export text..."))) {
             curExportType=GUI_EXPORT_TEXT;
             displayExport=true;
@@ -4965,7 +4933,6 @@ bool FurnaceGUI::loop() {
           workingDirZSMExport=fileDialog->getPath()+DIR_SEPARATOR_STR;
           break;
         case GUI_FILE_EXPORT_ROM:
-        case GUI_FILE_EXPORT_TIUNA:
         case GUI_FILE_EXPORT_TEXT:
         case GUI_FILE_EXPORT_CMDSTREAM:
           workingDirROMExport=fileDialog->getPath()+DIR_SEPARATOR_STR;
@@ -5061,6 +5028,9 @@ bool FurnaceGUI::loop() {
           if (curFileDialog==GUI_FILE_EXPORT_VGM) {
             checkExtension(".vgm");
           }
+          if (curFileDialog==GUI_FILE_EXPORT_ROM) {
+            checkExtension(romFilterExt.c_str());
+          }
           if (curFileDialog==GUI_FILE_EXPORT_ZSM) {
             checkExtension(".zsm");
           }
@@ -5521,29 +5491,20 @@ bool FurnaceGUI::loop() {
               }
               break;
             }
-            case GUI_FILE_EXPORT_TIUNA: {
-              SafeWriter* w=e->saveTiuna(willExport,asmBaseLabel.c_str(),tiunaFirstBankSize,tiunaOtherBankSize);
-              if (w!=NULL) {
-                FILE* f=ps_fopen(copyOfName.c_str(),"wb");
-                if (f!=NULL) {
-                  fwrite(w->getFinalBuf(),1,w->size(),f);
-                  fclose(f);
-                  pushRecentSys(copyOfName.c_str());
-                } else {
-                  showError("could not open file!");
-                }
-                w->finish();
-                delete w;
-                if (!e->getWarnings().empty()) {
-                  showWarning(e->getWarnings(),GUI_WARN_GENERIC);
-                }
-              } else {
-                showError(fmt::sprintf("Could not write TIunA! (%s)",e->getLastError()));
-              }
-              break;
-            }
             case GUI_FILE_EXPORT_ROM:
-              showError(_("Coming soon!"));
+              romExportPath=copyOfName;
+              pendingExport=e->buildROM(romTarget);
+              if (pendingExport==NULL) {
+                showError("could not create exporter! you may want to report this issue...");
+              } else {
+                pendingExport->setConf(romConfig);
+                if (pendingExport->go(e)) {
+                  displayExportingROM=true;
+                  romExportSave=true;
+                } else {
+                  showError("could not begin exporting process! TODO: elaborate");
+                }
+              }
               break;
             case GUI_FILE_EXPORT_TEXT: {
               SafeWriter* w=e->saveText(false);
@@ -5710,6 +5671,11 @@ bool FurnaceGUI::loop() {
       ImGui::OpenPopup(_("Rendering..."));
     }
 
+    if (displayExportingROM) {
+      displayExportingROM=false;
+      ImGui::OpenPopup(_("ROM Export Progress"));
+    }
+
     if (displayNew) {
       newSongQuery="";
       newSongFirstFrame=true;
@@ -5775,6 +5741,94 @@ bool FurnaceGUI::loop() {
       ImGui::EndPopup();
     }
 
+    ImVec2 romExportMinSize=mobileUI?ImVec2(canvasW-(portrait?0:(60.0*dpiScale)),canvasH-60.0*dpiScale):ImVec2(400.0f*dpiScale,200.0f*dpiScale);
+    ImVec2 romExportMaxSize=ImVec2(canvasW-((mobileUI && !portrait)?(60.0*dpiScale):0),canvasH-(mobileUI?(60.0*dpiScale):0));
+
+    centerNextWindow(_("ROM Export Progress"),canvasW,canvasH);
+    ImGui::SetNextWindowSizeConstraints(romExportMinSize,romExportMaxSize);
+    if (ImGui::BeginPopupModal(_("ROM Export Progress"),NULL)) {
+      if (pendingExport==NULL) {
+        ImGui::TextWrapped("%s",_("...ooooor you could try asking me a new ROM export?"));
+        ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
+        if (ImGui::Button(_("Erm what the sigma???"),ImVec2(ImGui::GetContentRegionAvail().x,0.0f))) {
+          ImGui::CloseCurrentPopup();
+        }
+      } else {
+        int progIndex=0;
+        while (true) {
+          DivROMExportProgress p=pendingExport->getProgress(progIndex);
+          if (p.name.empty()) break;
+          ImGui::Text("%s: %d%%",p.name.c_str(),(int)round(p.amount*100.0f));
+          ImGui::ProgressBar(p.amount,ImVec2(-FLT_MIN,0));
+          progIndex++;
+        }
+        ImVec2 romLogSize=ImGui::GetContentRegionAvail();
+        romLogSize.y-=ImGui::GetFrameHeightWithSpacing();
+        if (romLogSize.y<60.0f*dpiScale) romLogSize.y=60.0f*dpiScale;
+        if (ImGui::BeginChild("Export Log",romLogSize,true)) {
+          pendingExport->logLock.lock();
+          ImGui::PushFont(patFont);
+          for (String& i: pendingExport->exportLog) {
+            ImGui::TextWrapped("%s",i.c_str());
+          }
+          if (romExportSave) {
+            ImGui::SetScrollY(ImGui::GetScrollMaxY());
+          }
+          ImGui::PopFont();
+          pendingExport->logLock.unlock();
+        }
+        ImGui::EndChild();
+        if (pendingExport->isRunning()) {
+          WAKE_UP;
+          if (ImGui::Button(_("Abort"),ImVec2(ImGui::GetContentRegionAvail().x,0.0f))) {
+            pendingExport->abort();
+            delete pendingExport;
+            pendingExport=NULL;
+            romExportSave=false;
+            ImGui::CloseCurrentPopup();
+          }
+        } else {
+          if (romExportSave) {
+            pendingExport->wait();
+            if (!pendingExport->hasFailed()) {
+              // save files here (romExportPath)
+              for (DivROMExportOutput& i: pendingExport->getResult()) {
+                String path=romExportPath;
+                if (romMultiFile) {
+                  path+=DIR_SEPARATOR_STR;
+                  path+=i.name;
+                }
+                FILE* outFile=ps_fopen(path.c_str(),"wb");
+                if (outFile!=NULL) {
+                  fwrite(i.data->getFinalBuf(),1,i.data->size(),outFile);
+                  fclose(outFile);
+                } else {
+                  // TODO: handle failure here
+                }
+                i.data->finish();
+                delete i.data;
+              }
+            }
+            romExportSave=false;
+          }
+          if (pendingExport!=NULL) {
+            if (pendingExport->hasFailed()) {
+              ImGui::AlignTextToFramePadding();
+              ImGui::TextUnformatted(_("Error!"));
+              ImGui::SameLine();
+            }
+          }
+          ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
+          if (ImGui::Button(_("OK"),ImVec2(ImGui::GetContentRegionAvail().x,0.0f))) {
+            delete pendingExport;
+            pendingExport=NULL;
+            ImGui::CloseCurrentPopup();
+          }
+        }
+      }
+      ImGui::EndPopup();
+    }
+
     drawTutorial();
 
     ImVec2 newSongMinSize=mobileUI?ImVec2(canvasW-(portrait?0:(60.0*dpiScale)),canvasH-60.0*dpiScale):ImVec2(400.0f*dpiScale,200.0f*dpiScale);
@@ -7865,6 +7919,7 @@ FurnaceGUI::FurnaceGUI():
   snesFilterHex(false),
   modTableHex(false),
   displayEditString(false),
+  displayExportingROM(false),
   changeCoarse(false),
   mobileEdit(false),
   killGraphics(false),
@@ -7878,9 +7933,6 @@ FurnaceGUI::FurnaceGUI():
   vgmExportTrailingTicks(-1),
   drawHalt(10),
   zsmExportTickRate(60),
-  asmBaseLabel(""),
-  tiunaFirstBankSize(3072),
-  tiunaOtherBankSize(4096-48),
   macroPointSize(16),
   waveEditStyle(0),
   displayInsTypeListMakeInsSample(-1),
@@ -8341,7 +8393,11 @@ FurnaceGUI::FurnaceGUI():
   curTutorial(-1),
   curTutorialStep(0),
   dmfExportVersion(0),
-  curExportType(GUI_EXPORT_NONE) {
+  curExportType(GUI_EXPORT_NONE),
+  romTarget(DIV_ROM_ABSTRACT),
+  romMultiFile(false),
+  romExportSave(false),
+  pendingExport(NULL) {
   // value keys
   valueKeys[SDLK_0]=0;
   valueKeys[SDLK_1]=1;
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 633054560..aeecf4ee5 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -599,7 +599,6 @@ enum FurnaceGUIFileDialogs {
   GUI_FILE_EXPORT_AUDIO_PER_CHANNEL,
   GUI_FILE_EXPORT_VGM,
   GUI_FILE_EXPORT_ZSM,
-  GUI_FILE_EXPORT_TIUNA,
   GUI_FILE_EXPORT_CMDSTREAM,
   GUI_FILE_EXPORT_TEXT,
   GUI_FILE_EXPORT_ROM,
@@ -651,10 +650,9 @@ enum FurnaceGUIExportTypes {
 
   GUI_EXPORT_AUDIO=0,
   GUI_EXPORT_VGM,
+  GUI_EXPORT_ROM,
   GUI_EXPORT_ZSM,
-  GUI_EXPORT_TIUNA,
   GUI_EXPORT_CMD_STREAM,
-  GUI_EXPORT_AMIGA_VAL,
   GUI_EXPORT_TEXT,
   GUI_EXPORT_DMF
 };
@@ -1620,6 +1618,7 @@ class FurnaceGUI {
   bool displayNew, displayExport, displayPalette, fullScreen, preserveChanPos, sysDupCloneChannels, sysDupEnd, noteInputPoly, notifyWaveChange;
   bool wantScrollListIns, wantScrollListWave, wantScrollListSample;
   bool displayPendingIns, pendingInsSingle, displayPendingRawSample, snesFilterHex, modTableHex, displayEditString;
+  bool displayExportingROM;
   bool changeCoarse;
   bool mobileEdit;
   bool killGraphics;
@@ -1633,9 +1632,6 @@ class FurnaceGUI {
   int cvHiScore;
   int drawHalt;
   int zsmExportTickRate;
-  String asmBaseLabel;
-  int tiunaFirstBankSize;
-  int tiunaOtherBankSize;
   int macroPointSize;
   int waveEditStyle;
   int displayInsTypeListMakeInsSample;
@@ -2683,6 +2679,15 @@ class FurnaceGUI {
   int dmfExportVersion;
   FurnaceGUIExportTypes curExportType;
 
+  // ROM export specific
+  DivROMExportOptions romTarget;
+  DivConfig romConfig;
+  bool romMultiFile;
+  bool romExportSave;
+  String romFilterName, romFilterExt;
+  String romExportPath;
+  DivROMExport* pendingExport;
+
   // user presets window
   std::vector<int> selectedUserPreset;
 
@@ -2690,9 +2695,8 @@ class FurnaceGUI {
 
   void drawExportAudio(bool onWindow=false);
   void drawExportVGM(bool onWindow=false);
+  void drawExportROM(bool onWindow=false);
   void drawExportZSM(bool onWindow=false);
-  void drawExportTiuna(bool onWindow=false);
-  void drawExportAmigaVal(bool onWindow=false);
   void drawExportText(bool onWindow=false);
   void drawExportCommand(bool onWindow=false);
   void drawExportDMF(bool onWindow=false);
diff --git a/src/gui/sysConf.cpp b/src/gui/sysConf.cpp
index 085368b95..fa0cdf249 100644
--- a/src/gui/sysConf.cpp
+++ b/src/gui/sysConf.cpp
@@ -2482,7 +2482,7 @@ bool FurnaceGUI::drawSysConf(int chan, int sysPos, DivSystem type, DivConfig& fl
       break;
     }
     case DIV_SYSTEM_VERA: {
-      int chipType=flags.getInt("chipType",1);
+      int chipType=flags.getInt("chipType",2);
 
       ImGui::Text(_("Chip revision:"));
       ImGui::Indent();
@@ -2494,6 +2494,10 @@ bool FurnaceGUI::drawSysConf(int chan, int sysPos, DivSystem type, DivConfig& fl
         chipType=1;
         altered=true;
       }
+      if (ImGui::RadioButton(_("V 47.0.2 (Tri/Saw PW XOR)"),chipType==2)) {
+        chipType=2;
+        altered=true;
+      }
       ImGui::Unindent();
 
       if (altered) {
diff --git a/src/main.cpp b/src/main.cpp
index bd0028ebc..fbb90832b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -109,6 +109,8 @@ bool safeModeWithAudio=false;
 
 bool infoMode=false;
 
+bool noReportError=false;
+
 std::vector<TAParam> params;
 
 #ifdef HAVE_LOCALE
@@ -199,6 +201,11 @@ TAParamResult pConsole(String val) {
   return TA_PARAM_SUCCESS;
 }
 
+TAParamResult pQuiet(String val) {
+  noReportError=true;
+  return TA_PARAM_SUCCESS;
+}
+
 TAParamResult pNoStatus(String val) {
   consoleNoStatus=true;
   return TA_PARAM_SUCCESS;
@@ -457,6 +464,7 @@ void initParams() {
   params.push_back(TAParam("v","view",true,pView,"pattern|commands|nothing","set visualization (nothing by default)"));
   params.push_back(TAParam("i","info",false,pInfo,"","get info about a song"));
   params.push_back(TAParam("c","console",false,pConsole,"","enable console mode"));
+  params.push_back(TAParam("q","noreport",false,pQuiet,"","do not display message box on error"));
   params.push_back(TAParam("n","nostatus",false,pNoStatus,"","disable playback status in console mode"));
   params.push_back(TAParam("N","nocontrols",false,pNoControls,"","disable standard input controls in console mode"));
 
@@ -475,18 +483,25 @@ void initParams() {
 #ifdef _WIN32
 void reportError(String what) {
   logE("%s",what);
-  MessageBox(NULL,what.c_str(),"Furnace",MB_OK|MB_ICONERROR);
+  if (!noReportError) {
+    MessageBox(NULL,what.c_str(),"Furnace",MB_OK|MB_ICONERROR);
+  }
 }
 #elif defined(ANDROID) || defined(__APPLE__)
 void reportError(String what) {
   logE("%s",what);
 #ifdef HAVE_SDL2
-  SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,"Error",what.c_str(),NULL);
+  if (!noReportError) {
+    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,"Error",what.c_str(),NULL);
+  }
 #endif
 }
 #else
 void reportError(String what) {
   logE("%s",what);
+  if (!noReportError) {
+    // dummy
+  }
 }
 #endif
 
@@ -715,14 +730,14 @@ int main(int argc, char** argv) {
     return 1;
   }
 
-  if (fileName.empty() && (benchMode || infoMode || outName!="" || vgmOutName!="" || cmdOutName!="")) {
+  if (fileName.empty() && (benchMode || infoMode || outName!="" || vgmOutName!="" || zsmOutName!="" || cmdOutName!="")) {
     logE("provide a file!");
     return 1;
   }
 
 #ifdef HAVE_GUI
-  if (e.preInit(consoleMode || benchMode || infoMode || outName!="" || vgmOutName!="" || cmdOutName!="")) {
-    if (consoleMode || benchMode || infoMode || outName!="" || vgmOutName!="" || cmdOutName!="") {
+  if (e.preInit(consoleMode || benchMode || infoMode || outName!="" || vgmOutName!="" || zsmOutName!="" || cmdOutName!="")) {
+    if (consoleMode || benchMode || infoMode || outName!="" || vgmOutName!="" || zsmOutName!="" || cmdOutName!="") {
       logW("engine wants safe mode, but Furnace GUI is not going to start.");
     } else {
       safeMode=true;
@@ -734,7 +749,7 @@ int main(int argc, char** argv) {
   }
 #endif
 
-  if (safeMode && (consoleMode || benchMode || infoMode || outName!="" || vgmOutName!="" || cmdOutName!="")) {
+  if (safeMode && (consoleMode || benchMode || infoMode || outName!="" || vgmOutName!="" || zsmOutName!="" || cmdOutName!="")) {
     logE("you can't use safe mode and console/export mode together.");
     return 1;
   }
@@ -743,7 +758,7 @@ int main(int argc, char** argv) {
     e.setAudio(DIV_AUDIO_DUMMY);
   }
 
-  if (!fileName.empty() && ((!e.getConfBool("tutIntroPlayed",TUT_INTRO_PLAYED)) || e.getConfInt("alwaysPlayIntro",0)!=3 || consoleMode || benchMode || infoMode || outName!="" || vgmOutName!="" || cmdOutName!="")) {
+  if (!fileName.empty() && ((!e.getConfBool("tutIntroPlayed",TUT_INTRO_PLAYED)) || e.getConfInt("alwaysPlayIntro",0)!=3 || consoleMode || benchMode || infoMode || outName!="" || vgmOutName!="" || zsmOutName!="" || cmdOutName!="")) {
     logI("loading module...");
     FILE* f=ps_fopen(fileName.c_str(),"rb");
     if (f==NULL) {
@@ -835,7 +850,7 @@ int main(int argc, char** argv) {
     return 0;
   }
 
-  if (outName!="" || vgmOutName!="" || cmdOutName!="") {
+  if (outName!="" || vgmOutName!="" || zsmOutName!="" || cmdOutName!="") {
     if (cmdOutName!="") {
       SafeWriter* w=e.saveCommand();
       if (w!=NULL) {
@@ -868,6 +883,23 @@ int main(int argc, char** argv) {
         reportError(_("could not write VGM!"));
       }
     }
+    if (zsmOutName!="") {
+      // TODO: changing parameters
+      SafeWriter* w=e.saveZSM(60,true,true);
+      if (w!=NULL) {
+        FILE* f=ps_fopen(zsmOutName.c_str(),"wb");
+        if (f!=NULL) {
+          fwrite(w->getFinalBuf(),1,w->size(),f);
+          fclose(f);
+        } else {
+          reportError(fmt::sprintf(_("could not open file! (%s)"),e.getLastError()));
+        }
+        w->finish();
+        delete w;
+      } else {
+        reportError(fmt::sprintf(_("could not write ZSM! (%s)"),e.getLastError()));
+      }
+    }
     if (outName!="") {
       e.setConsoleMode(true);
       e.saveAudio(outName.c_str(),exportOptions);
diff --git a/wavetables/32x32/32x32sam.fuw b/wavetables/32x32/32x32sam.fuw
new file mode 100644
index 000000000..4df39259c
Binary files /dev/null and b/wavetables/32x32/32x32sam.fuw differ