diff --git a/src/engine/platform/arcade.cpp b/src/engine/platform/arcade.cpp
index 7acbe3a7e..d36b40216 100644
--- a/src/engine/platform/arcade.cpp
+++ b/src/engine/platform/arcade.cpp
@@ -630,6 +630,16 @@ int DivPlatformArcade::dispatch(DivCommand c) {
       }
       break;
     }
+    case DIV_CMD_FM_FMS: {
+      chan[c.chan].state.fms=c.value&7;
+      rWrite(chanOffs[c.chan]+ADDR_FMS_AMS,((chan[c.chan].state.fms&7)<<4)|(chan[c.chan].state.ams&3));
+      break;
+    }
+    case DIV_CMD_FM_AMS: {
+      chan[c.chan].state.ams=c.value&3;
+      rWrite(chanOffs[c.chan]+ADDR_FMS_AMS,((chan[c.chan].state.fms&7)<<4)|(chan[c.chan].state.ams&3));
+      break;
+    }
     case DIV_CMD_FM_MULT: {
       unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
       DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
diff --git a/src/engine/platform/tx81z.cpp b/src/engine/platform/tx81z.cpp
index fe709240d..ba2e879bb 100644
--- a/src/engine/platform/tx81z.cpp
+++ b/src/engine/platform/tx81z.cpp
@@ -679,6 +679,26 @@ int DivPlatformTX81Z::dispatch(DivCommand c) {
       }*/
       break;
     }
+    case DIV_CMD_FM_FMS: {
+      chan[c.chan].state.fms=c.value&7;
+      rWrite(chanOffs[c.chan]+ADDR_FMS_AMS,((chan[c.chan].state.fms&7)<<4)|(chan[c.chan].state.ams&3));
+      break;
+    }
+    case DIV_CMD_FM_AMS: {
+      chan[c.chan].state.ams=c.value&3;
+      rWrite(chanOffs[c.chan]+ADDR_FMS_AMS,((chan[c.chan].state.fms&7)<<4)|(chan[c.chan].state.ams&3));
+      break;
+    }
+    case DIV_CMD_FM_FMS2: {
+      chan[c.chan].state.fms2=c.value&7;
+      rWrite(chanOffs[c.chan]+ADDR_FMS2_AMS2,((chan[c.chan].state.fms2&7)<<4)|(chan[c.chan].state.ams2&3));
+      break;
+    }
+    case DIV_CMD_FM_AMS2: {
+      chan[c.chan].state.ams2=c.value&3;
+      rWrite(chanOffs[c.chan]+ADDR_FMS2_AMS2,((chan[c.chan].state.fms2&7)<<4)|(chan[c.chan].state.ams2&3));
+      break;
+    }
     case DIV_CMD_FM_MULT: {
       unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
       DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];