diff --git a/src/engine/dispatch.h b/src/engine/dispatch.h
index 55756767a..06157e841 100644
--- a/src/engine/dispatch.h
+++ b/src/engine/dispatch.h
@@ -441,6 +441,8 @@ enum DivMemoryEntryType {
   DIV_MEMORY_WAVE_RAM,
   DIV_MEMORY_WAVE_STATIC,
   DIV_MEMORY_ECHO,
+  DIV_MEMORY_N163_LOAD,
+  DIV_MEMORY_N163_PLAY,
   DIV_MEMORY_BANK0,
   DIV_MEMORY_BANK1,
   DIV_MEMORY_BANK2,
@@ -470,15 +472,25 @@ struct DivMemoryEntry {
     end(0) {}
 };
 
+enum DivMemoryWaveView: unsigned char {
+  DIV_MEMORY_WAVE_NONE=0,
+  DIV_MEMORY_WAVE_4BIT, // Namco 163
+  DIV_MEMORY_WAVE_6BIT, // Virtual Boy
+};
+
 struct DivMemoryComposition {
   std::vector<DivMemoryEntry> entries;
   String name;
   size_t capacity;
   size_t used;
+  const unsigned char* memory;
+  DivMemoryWaveView waveformView;
   DivMemoryComposition():
     name(""),
     capacity(0),
-    used(0) {}
+    used(0),
+    memory(NULL),
+    waveformView(DIV_MEMORY_WAVE_NONE) {}
 };
 
 class DivEngine;
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 242e465dd..48335692f 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -542,7 +542,7 @@ class DivEngine {
   void testFunction();
 
   bool loadDMF(unsigned char* file, size_t len);
-  bool loadFur(unsigned char* file, size_t len);
+  bool loadFur(unsigned char* file, size_t len, int variantID=0);
   bool loadMod(unsigned char* file, size_t len);
   bool loadS3M(unsigned char* file, size_t len);
   bool loadFTM(unsigned char* file, size_t len);
diff --git a/src/engine/fileOps/fileOpsCommon.cpp b/src/engine/fileOps/fileOpsCommon.cpp
index 56046b078..6eadfef62 100644
--- a/src/engine/fileOps/fileOpsCommon.cpp
+++ b/src/engine/fileOps/fileOpsCommon.cpp
@@ -131,6 +131,8 @@ bool DivEngine::load(unsigned char* f, size_t slen) {
     return loadFTM(file,len);
   } else if (memcmp(file,DIV_FUR_MAGIC,16)==0) {
     return loadFur(file,len);
+  } else if (memcmp(file,DIV_FUR_MAGIC_DS0,16)==0) {
+    return loadFur(file,len,DIV_FUR_VARIANT_B);
   } else if (memcmp(file,DIV_FC13_MAGIC,4)==0 || memcmp(file,DIV_FC14_MAGIC,4)==0) {
     return loadFC(file,len);
   }
diff --git a/src/engine/fileOps/fileOpsCommon.h b/src/engine/fileOps/fileOpsCommon.h
index baceadaf3..e758f0ed5 100644
--- a/src/engine/fileOps/fileOpsCommon.h
+++ b/src/engine/fileOps/fileOpsCommon.h
@@ -52,3 +52,10 @@ struct NotZlibException {
 #define DIV_FC13_MAGIC "SMOD"
 #define DIV_FC14_MAGIC "FC14"
 #define DIV_S3M_MAGIC "SCRM"
+
+#define DIV_FUR_MAGIC_DS0 "Furnace-B module"
+
+enum DivFurVariants: int {
+  DIV_FUR_VARIANT_VANILLA=0,
+  DIV_FUR_VARIANT_B=1,
+};
diff --git a/src/engine/fileOps/fur.cpp b/src/engine/fileOps/fur.cpp
index 5397a266c..0cd32fa76 100644
--- a/src/engine/fileOps/fur.cpp
+++ b/src/engine/fileOps/fur.cpp
@@ -691,7 +691,7 @@ void DivEngine::convertOldFlags(unsigned int oldFlags, DivConfig& newFlags, DivS
   }
 }
 
-bool DivEngine::loadFur(unsigned char* file, size_t len) {
+bool DivEngine::loadFur(unsigned char* file, size_t len, int variantID) {
   unsigned int insPtr[256];
   unsigned int wavePtr[256];
   unsigned int samplePtr[256];
@@ -720,6 +720,11 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
     ds.version=reader.readS();
     logI("module version %d (0x%.2x)",ds.version,ds.version);
 
+    if (variantID!=DIV_FUR_VARIANT_VANILLA) {
+      logW("Furnace variant detected: %d",variantID);
+      addWarning("this module was created with a downstream version of Furnace. certain features may not be compatible.");
+    }
+
     if (ds.version>DIV_ENGINE_VERSION) {
       logW("this module was created with a more recent version of Furnace!");
       addWarning("this module was created with a more recent version of Furnace!");
diff --git a/src/engine/instrument.cpp b/src/engine/instrument.cpp
index 37bd99f57..8ad21b100 100644
--- a/src/engine/instrument.cpp
+++ b/src/engine/instrument.cpp
@@ -2952,6 +2952,8 @@ DivDataErrors DivInstrument::readInsData(SafeReader& reader, short version, DivS
     type=0;
   } else if (memcmp(magic,"INS2",4)==0) {
     type=1;
+  } else if (memcmp(magic,"IN2B",4)==0) { // DIV_FUR_VARIANT_B
+    type=1;
   } else if (memcmp(magic,"FINS",4)==0) {
     type=2;
   } else {
diff --git a/src/engine/platform/n163.cpp b/src/engine/platform/n163.cpp
index 5e2ccd9c0..d1ceaf5a0 100644
--- a/src/engine/platform/n163.cpp
+++ b/src/engine/platform/n163.cpp
@@ -279,6 +279,19 @@ void DivPlatformN163::tick(bool sysTick) {
       chan[i].freqChanged=false;
     }
   }
+
+  // update memory composition positions
+  for (int i=0; i<=chanMax; i++) {
+    memCompo.entries[i].begin=chan[i].wavePos>>1;
+    memCompo.entries[i].end=(chan[i].wavePos+chan[i].waveLen)>>1;
+    memCompo.entries[i+8].begin=chan[i].curWavePos>>1;
+    memCompo.entries[i+8].end=(chan[i].curWavePos+chan[i].curWaveLen)>>1;
+  }
+
+  // update register pool
+  for (int i=0; i<128; i++) {
+    regPool[i]=n163.reg(i);
+  }
 }
 
 int DivPlatformN163::dispatch(DivCommand c) {
@@ -476,6 +489,7 @@ void DivPlatformN163::forceIns() {
       chan[i].waveChanged=true;
     }
   }
+  memCompo.entries[16].begin=120-chanMax*8;
 }
 
 void DivPlatformN163::notifyWaveChange(int wave) {
@@ -516,9 +530,6 @@ DivDispatchOscBuffer* DivPlatformN163::getOscBuffer(int ch) {
 }
 
 unsigned char* DivPlatformN163::getRegisterPool() {
-  for (int i=0; i<128; i++) {
-    regPool[i]=n163.reg(i);
-  }
   return regPool;
 }
 
@@ -544,6 +555,8 @@ void DivPlatformN163::reset() {
   loadWave=-1;
   loadPos=0;
   rWrite(0x7f,initChanMax<<4);
+
+  memCompo.entries[16].begin=120-chanMax*8;
 }
 
 void DivPlatformN163::poke(unsigned int addr, unsigned short val) {
@@ -554,6 +567,11 @@ void DivPlatformN163::poke(std::vector<DivRegWrite>& wlist) {
   for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
 }
 
+const DivMemoryComposition* DivPlatformN163::getMemCompo(int index) {
+  if (index!=0) return NULL;
+  return &memCompo;
+}
+
 void DivPlatformN163::setFlags(const DivConfig& flags) {
   switch (flags.getInt("clockSel",0)) {
     case 1: // PAL
@@ -591,6 +609,20 @@ int DivPlatformN163::init(DivEngine* p, int channels, int sugRate, const DivConf
     isMuted[i]=false;
     oscBuf[i]=new DivDispatchOscBuffer;
   }
+
+  memCompo.used=0;
+  memCompo.capacity=128;
+  memCompo.memory=regPool;
+  memCompo.waveformView=DIV_MEMORY_WAVE_4BIT;
+
+  for (int i=0; i<8; i++) {
+    memCompo.entries.push_back(DivMemoryEntry(DIV_MEMORY_N163_LOAD,fmt::sprintf("Channel %d (load)",i),-1,0,0));
+  }
+  for (int i=0; i<8; i++) {
+    memCompo.entries.push_back(DivMemoryEntry(DIV_MEMORY_N163_PLAY,fmt::sprintf("Channel %d (play)",i),-1,0,0));
+  }
+  memCompo.entries.push_back(DivMemoryEntry(DIV_MEMORY_RESERVED,"Registers",-1,127,128));
+
   setFlags(flags);
 
   reset();
diff --git a/src/engine/platform/n163.h b/src/engine/platform/n163.h
index 648a7af24..2c7c404fc 100644
--- a/src/engine/platform/n163.h
+++ b/src/engine/platform/n163.h
@@ -65,6 +65,7 @@ class DivPlatformN163: public DivDispatch {
 
   n163_core n163;
   unsigned char regPool[128];
+  DivMemoryComposition memCompo;
   void updateWave(int ch, int wave, int pos, int len);
   void updateWaveCh(int ch);
   friend void putDispatchChip(void*,int);
@@ -82,6 +83,7 @@ class DivPlatformN163: public DivDispatch {
     void forceIns();
     void tick(bool sysTick=true);
     void muteChannel(int ch, bool mute);
+    const DivMemoryComposition* getMemCompo(int index);
     void setFlags(const DivConfig& flags);
     void notifyWaveChange(int wave);
     void notifyInsChange(int ins);
diff --git a/src/gui/gui.h b/src/gui/gui.h
index e99964454..8358be6d5 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -411,6 +411,7 @@ enum FurnaceGUIColors {
   GUI_COLOR_PATCHBAY_CONNECTION_HI,
 
   GUI_COLOR_MEMORY_BG,
+  GUI_COLOR_MEMORY_DATA,
   GUI_COLOR_MEMORY_FREE,
   GUI_COLOR_MEMORY_PADDING,
   GUI_COLOR_MEMORY_RESERVED,
@@ -421,6 +422,8 @@ enum FurnaceGUIColors {
   GUI_COLOR_MEMORY_WAVE_RAM,
   GUI_COLOR_MEMORY_WAVE_STATIC,
   GUI_COLOR_MEMORY_ECHO,
+  GUI_COLOR_MEMORY_N163_LOAD,
+  GUI_COLOR_MEMORY_N163_PLAY,
   GUI_COLOR_MEMORY_BANK0,
   GUI_COLOR_MEMORY_BANK1,
   GUI_COLOR_MEMORY_BANK2,
diff --git a/src/gui/guiConst.cpp b/src/gui/guiConst.cpp
index 31567ea3b..3d7fffc90 100644
--- a/src/gui/guiConst.cpp
+++ b/src/gui/guiConst.cpp
@@ -1109,6 +1109,7 @@ const FurnaceGUIColorDef guiColors[GUI_COLOR_MAX]={
   D(GUI_COLOR_PATCHBAY_CONNECTION_HI,"",ImVec4(0.2f,1.0f,1.0f,1.0f)),
 
   D(GUI_COLOR_MEMORY_BG,"",ImVec4(0.12f,0.12f,0.12f,1.0f)),
+  D(GUI_COLOR_MEMORY_DATA,"",ImVec4(1.0f,1.0f,1.0f,0.8f)),
   D(GUI_COLOR_MEMORY_FREE,"",ImVec4(0.25f,0.25f,0.25f,1.0f)),
   D(GUI_COLOR_MEMORY_PADDING,"",ImVec4(0.25f,0.25f,0.25f,1.0f)),
   D(GUI_COLOR_MEMORY_RESERVED,"",ImVec4(0.5f,0.5f,0.6f,1.0f)),
@@ -1119,6 +1120,8 @@ const FurnaceGUIColorDef guiColors[GUI_COLOR_MAX]={
   D(GUI_COLOR_MEMORY_WAVE_RAM,"",ImVec4(1.0f,0.5f,0.1f,1.0f)),
   D(GUI_COLOR_MEMORY_WAVE_STATIC,"",ImVec4(1.0f,0.3f,0.1f,1.0f)),
   D(GUI_COLOR_MEMORY_ECHO,"",ImVec4(0.2f,1.0f,1.0f,1.0f)),
+  D(GUI_COLOR_MEMORY_N163_LOAD,"",ImVec4(1.0f,0.5f,0.1f,1.0f)),
+  D(GUI_COLOR_MEMORY_N163_PLAY,"",ImVec4(1.0f,1.0f,0.2f,1.0f)),
   D(GUI_COLOR_MEMORY_BANK0,"",ImVec4(1.0f,0.1f,0.1f,1.0f)),
   D(GUI_COLOR_MEMORY_BANK1,"",ImVec4(1.0f,0.5f,0.1f,1.0f)),
   D(GUI_COLOR_MEMORY_BANK2,"",ImVec4(1.0f,1.0f,0.1f,1.0f)),
diff --git a/src/gui/memory.cpp b/src/gui/memory.cpp
index c98c3f127..3a506a03c 100644
--- a/src/gui/memory.cpp
+++ b/src/gui/memory.cpp
@@ -56,17 +56,28 @@ void FurnaceGUI::drawMemory() {
           minArea.y+size.y
         );
         ImRect rect=ImRect(minArea,maxArea);
+        ImRect dataRect=rect;
+        ImRect entryRect=rect;
         ImGuiStyle& style=ImGui::GetStyle();
         ImGui::ItemSize(size,style.FramePadding.y);
         snprintf(tempID,1023,"MC%d_%d",i,j);
         if (ImGui::ItemAdd(rect,ImGui::GetID(tempID))) {
           dl->AddRectFilled(rect.Min,rect.Max,ImGui::GetColorU32(uiColors[GUI_COLOR_MEMORY_BG]));
 
+          if (mc->memory!=NULL && mc->waveformView!=DIV_MEMORY_WAVE_NONE) {
+            dataRect.Max.y-=8.0f*dpiScale;
+            entryRect.Min.y=entryRect.Max.y-8.0f*dpiScale;
+          }
+
           int curHover=-1;
           int kIndex=0;
           if (mc->capacity>0) for (const DivMemoryEntry& k: mc->entries) {
-            ImVec2 pos1=ImLerp(rect.Min,rect.Max,ImVec2((double)k.begin/(double)mc->capacity,0.0f));
-            ImVec2 pos2=ImLerp(rect.Min,rect.Max,ImVec2((double)k.end/(double)mc->capacity,1.0f));
+            if (k.begin==k.end) {
+              kIndex++;
+              continue;
+            }
+            ImVec2 pos1=ImLerp(entryRect.Min,entryRect.Max,ImVec2((double)k.begin/(double)mc->capacity,(k.type==DIV_MEMORY_N163_LOAD)?0.5f:0.0f));
+            ImVec2 pos2=ImLerp(entryRect.Min,entryRect.Max,ImVec2((double)k.end/(double)mc->capacity,(k.type==DIV_MEMORY_N163_PLAY)?0.5f:1.0f));
             ImVec2 linePos=pos1;
             linePos.y=rect.Max.y;
 
@@ -79,6 +90,27 @@ void FurnaceGUI::drawMemory() {
             kIndex++;
           }
 
+          if (mc->memory!=NULL) {
+            switch (mc->waveformView) {
+              case DIV_MEMORY_WAVE_4BIT:
+                for (int k=0; k<(int)(mc->capacity<<1); k++) {
+                  unsigned char nibble=mc->memory[k>>1];
+                  if (k&1) {
+                    nibble&=15;
+                  } else {
+                    nibble>>=4;
+                  }
+
+                  ImVec2 pos1=ImLerp(dataRect.Min,dataRect.Max,ImVec2((double)k/(double)(mc->capacity<<1),1.0f-((float)(nibble+1)/16.0f)));
+                  ImVec2 pos2=ImLerp(dataRect.Min,dataRect.Max,ImVec2((double)(k+1)/(double)(mc->capacity<<1),1.0f));
+                  dl->AddRectFilled(pos1,pos2,ImGui::GetColorU32(uiColors[GUI_COLOR_MEMORY_DATA]));
+                }
+                break;
+              default:
+                break;
+            }
+          }
+
           if (ImGui::ItemHoverable(rect,ImGui::GetID(tempID),0)) {
             if (curHover>=0 && curHover<(int)mc->entries.size()) {
               const DivMemoryEntry& entry=mc->entries[curHover];
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index 68e30445d..6d7d11d69 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -3685,6 +3685,7 @@ void FurnaceGUI::drawSettings() {
         }
         if (ImGui::TreeNode("Memory Composition")) {
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_BG,"Background");
+          UI_COLOR_CONFIG(GUI_COLOR_MEMORY_DATA,"Waveform data");
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_FREE,"Unknown");
           //UI_COLOR_CONFIG(GUI_COLOR_MEMORY_PADDING,"");
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_RESERVED,"Reserved");
@@ -3695,6 +3696,8 @@ void FurnaceGUI::drawSettings() {
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_WAVE_RAM,"Wave RAM");
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_WAVE_STATIC,"Wavetable (static)");
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_ECHO,"Echo buffer");
+          UI_COLOR_CONFIG(GUI_COLOR_MEMORY_N163_LOAD,"Namco 163 load pos");
+          UI_COLOR_CONFIG(GUI_COLOR_MEMORY_N163_PLAY,"Namco 163 play pos");
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_BANK0,"Sample (bank 0)");
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_BANK1,"Sample (bank 1)");
           UI_COLOR_CONFIG(GUI_COLOR_MEMORY_BANK2,"Sample (bank 2)");