diff --git a/src/engine/platform/ym2203.cpp b/src/engine/platform/ym2203.cpp
index 13fc014d..6a086437 100644
--- a/src/engine/platform/ym2203.cpp
+++ b/src/engine/platform/ym2203.cpp
@@ -203,6 +203,7 @@ void DivPlatformYM2203::tick(bool sysTick) {
   ay->tick(sysTick);
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
@@ -807,6 +808,7 @@ void DivPlatformYM2203::forceIns() {
   ay->forceIns();
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
diff --git a/src/engine/platform/ym2203ext.cpp b/src/engine/platform/ym2203ext.cpp
index f3b279c9..fc629487 100644
--- a/src/engine/platform/ym2203ext.cpp
+++ b/src/engine/platform/ym2203ext.cpp
@@ -448,6 +448,7 @@ void DivPlatformYM2203Ext::forceIns() {
   ay->forceIns();
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
diff --git a/src/engine/platform/ym2608.cpp b/src/engine/platform/ym2608.cpp
index b247be44..87fc7914 100644
--- a/src/engine/platform/ym2608.cpp
+++ b/src/engine/platform/ym2608.cpp
@@ -654,6 +654,7 @@ void DivPlatformYM2608::tick(bool sysTick) {
   ay->tick(sysTick);
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
@@ -1199,6 +1200,7 @@ void DivPlatformYM2608::forceIns() {
   ay->forceIns();
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
diff --git a/src/engine/platform/ym2608ext.cpp b/src/engine/platform/ym2608ext.cpp
index 66a4d252..0b73b42c 100644
--- a/src/engine/platform/ym2608ext.cpp
+++ b/src/engine/platform/ym2608ext.cpp
@@ -483,6 +483,7 @@ void DivPlatformYM2608Ext::forceIns() {
   ay->forceIns();
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index 794fc7d9..89e354a9 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -593,13 +593,14 @@ void DivPlatformYM2610::tick(bool sysTick) {
   ay->tick(sysTick);
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
 }
 
 int DivPlatformYM2610::dispatch(DivCommand c) {
-  if (c.chan>=psgChanOffs && c.chan<7) {
+  if (c.chan>=psgChanOffs && c.chan<adpcmAChanOffs) {
     c.chan-=psgChanOffs;
     return ay->dispatch(c);
   }
@@ -1169,6 +1170,7 @@ void DivPlatformYM2610::forceIns() {
   ay->forceIns();
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
diff --git a/src/engine/platform/ym2610b.cpp b/src/engine/platform/ym2610b.cpp
index 941cee22..3ee916a2 100644
--- a/src/engine/platform/ym2610b.cpp
+++ b/src/engine/platform/ym2610b.cpp
@@ -656,6 +656,7 @@ void DivPlatformYM2610B::tick(bool sysTick) {
   ay->tick(sysTick);
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
@@ -1232,6 +1233,7 @@ void DivPlatformYM2610B::forceIns() {
   ay->forceIns();
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
diff --git a/src/engine/platform/ym2610bext.cpp b/src/engine/platform/ym2610bext.cpp
index 5c8c2c63..201bb598 100644
--- a/src/engine/platform/ym2610bext.cpp
+++ b/src/engine/platform/ym2610bext.cpp
@@ -474,6 +474,7 @@ void DivPlatformYM2610BExt::forceIns() {
   ay->forceIns();
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();
diff --git a/src/engine/platform/ym2610ext.cpp b/src/engine/platform/ym2610ext.cpp
index 22c9ebf9..ac82bb81 100644
--- a/src/engine/platform/ym2610ext.cpp
+++ b/src/engine/platform/ym2610ext.cpp
@@ -474,6 +474,7 @@ void DivPlatformYM2610Ext::forceIns() {
   ay->forceIns();
   ay->flushWrites();
   for (DivRegWrite& i: ay->getRegisterWrites()) {
+    if (i.addr>15) continue;
     immWrite(i.addr&15,i.val);
   }
   ay->getRegisterWrites().clear();