diff --git a/src/engine/platform/ym2608.cpp b/src/engine/platform/ym2608.cpp
index 236e6a087..b7e18e69d 100644
--- a/src/engine/platform/ym2608.cpp
+++ b/src/engine/platform/ym2608.cpp
@@ -1405,7 +1405,7 @@ const void* DivPlatformYM2608::getSampleMem(int index) {
 }
 
 size_t DivPlatformYM2608::getSampleMemCapacity(int index) {
-  return index == 0 ? 2097152 : 0;
+  return index == 0 ? 262144 : 0;
 }
 
 size_t DivPlatformYM2608::getSampleMemUsage(int index) {
diff --git a/src/engine/platform/ym2608Interface.cpp b/src/engine/platform/ym2608Interface.cpp
index 62cd8899f..242721f09 100644
--- a/src/engine/platform/ym2608Interface.cpp
+++ b/src/engine/platform/ym2608Interface.cpp
@@ -31,7 +31,7 @@ uint8_t DivYM2608Interface::ymfm_external_read(ymfm::access_class type, uint32_t
       if (adpcmBMem==NULL) {
         return 0;
       }
-      return adpcmBMem[address&0xffffff];
+      return adpcmBMem[address&0x3ffff];
     default:
       return 0;
   }