VGM export: write resets and GD3 tag

may be non-standard compliant (yet)
also it crashes foobar2000 for some reason but this will be fixed

src/engine/platform/arcade.cpp

@@ -556,6 +556,9 @@ void DivPlatformArcade::reset() {
     memset(&fm,0,sizeof(opm_t));
     OPM_Reset(&fm);
   }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
   for (int i=0; i<13; i++) {
     chan[i]=DivPlatformArcade::Channel();
     chan[i].vol=0x7f;

src/engine/platform/ay.cpp

@@ -297,6 +297,9 @@ void DivPlatformAY8910::reset() {
     chan[i]=DivPlatformAY8910::Channel();
     chan[i].vol=0x0f;
   }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
 
   for (int i=0; i<16; i++) {
     oldWrites[i]=-1;

src/engine/platform/ay8930.cpp

@@ -339,6 +339,9 @@ void DivPlatformAY8930::reset() {
     ayEnvSlide[i]=0;
     ayEnvSlideLow[i]=0;
   }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
 
   for (int i=0; i<32; i++) {
     oldWrites[i]=-1;

src/engine/platform/gb.cpp

@@ -305,6 +305,9 @@ void DivPlatformGB::reset() {
   for (int i=0; i<4; i++) {
     chan[i]=DivPlatformGB::Channel();
   }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
   memset(gb,0,sizeof(GB_gameboy_t));
   gb->model=GB_MODEL_DMG_B;
   GB_apu_init(gb);

src/engine/platform/genesis.cpp

@@ -538,6 +538,7 @@ void DivPlatformGenesis::forceIns() {
     rWrite(0x2b,0x80);
   }
   immWrite(0x22,lfoValue);
+  psg.forceIns();
 }
 
 void DivPlatformGenesis::toggleRegisterDump(bool enable) {
@@ -548,6 +549,9 @@ void DivPlatformGenesis::toggleRegisterDump(bool enable) {
 void DivPlatformGenesis::reset() {
   while (!writes.empty()) writes.pop();
   OPN2_Reset(&fm);
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
   for (int i=0; i<10; i++) {
     chan[i]=DivPlatformGenesis::Channel();
     chan[i].vol=0x7f;
@@ -576,6 +580,7 @@ void DivPlatformGenesis::reset() {
   
   // PSG
   psg.reset();
+  psg.getRegisterWrites().clear();
   psgClocks=0;
   psgOut=0;
 }

src/engine/platform/nes.cpp

@@ -348,6 +348,9 @@ void DivPlatformNES::reset() {
   for (int i=0; i<5; i++) {
     chan[i]=DivPlatformNES::Channel();
   }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
 
   dacPeriod=0;
   dacPos=0;

src/engine/platform/pce.cpp

@@ -345,6 +345,9 @@ void DivPlatformPCE::reset() {
   for (int i=0; i<6; i++) {
     chan[i]=DivPlatformPCE::Channel();
   }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
   pce->Power(0);
   lastPan=0xff;
   memset(tempL,0,32*sizeof(int));

src/engine/platform/saa.cpp

@@ -262,6 +262,9 @@ void DivPlatformSAA1099::reset() {
     chan[i]=DivPlatformSAA1099::Channel();
     chan[i].vol=0x0f;
   }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
 
   lastBusy=60;
   dacMode=0;

src/engine/platform/sms.cpp

@@ -191,6 +191,9 @@ void DivPlatformSMS::reset() {
   for (int i=0; i<4; i++) {
     chan[i]=DivPlatformSMS::Channel();
   }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
   sn->device_start();
   snNoiseMode=3;
   updateSNMode=false;

src/engine/platform/ym2610.cpp

@@ -572,6 +572,9 @@ void DivPlatformYM2610::forceIns() {
 
 void DivPlatformYM2610::reset() {
   while (!writes.empty()) writes.pop();
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
   fm->reset();
   for (int i=0; i<13; i++) {
     chan[i]=DivPlatformYM2610::Channel();