--- a/src/sb16.js
+++ b/src/sb16.js
@@ -187 +187,2 @@
-    this.fm_waveform_select_enable = false;
+    this.fm_status = 0xFF;
+    this.fm_waveform_select_enable = [false, false];
@@ -247,0 +249,4 @@
+    bus.register("opl-status", function(status)
+    {
+        this.fm_status = status;
+    }, this);
@@ -302,0 +307 @@
+    this.bus.send("opl-reset");
@@ -433,2 +438,3 @@
-    dbg_log("220 read: fm music status port (unimplemented)", LOG_SB16);
-    return 0xFF;
+    dbg_log("220 read: fm music status port", LOG_SB16);
+    this.bus.send("opl-status-request", 0);
+    return this.fm_status;
@@ -445,2 +451,3 @@
-    dbg_log("222 read: advanced fm music status port (unimplemented)", LOG_SB16);
-    return 0xFF;
+    dbg_log("222 read: advanced fm music status port", LOG_SB16);
+    this.bus.send("opl-status-request", 0);
+    return this.fm_status;
@@ -553,2 +561,3 @@
-    dbg_log("220 write: (unimplemented) fm register 0 address = " + h(value), LOG_SB16);
-    this.fm_current_address0 = 0;
+    dbg_log("220 write: fm register 0 address = " + h(value), LOG_SB16);
+    this.fm_current_address0 = value;
+    this.bus.send("opl-write", [0, value]);
@@ -560 +569,2 @@
-    dbg_log("221 write: (unimplemented) fm register 0 data = " + h(value), LOG_SB16);
+    dbg_log("221 write: fm register 0 data = " + h(value), LOG_SB16);
+    this.bus.send("opl-write", [1, value]);
@@ -572,2 +582,3 @@
-    dbg_log("222 write: (unimplemented) fm register 1 address = " + h(value), LOG_SB16);
-    this.fm_current_address1 = 0;
+    dbg_log("222 write: fm register 1 address = " + h(value), LOG_SB16);
+    this.fm_current_address1 = value;
+    this.bus.send("opl-write", [2, value]);
@@ -579 +590,2 @@
-    dbg_log("223 write: (unimplemented) fm register 1 data =" + h(value), LOG_SB16);
+    dbg_log("223 write: fm register 1 data =" + h(value), LOG_SB16);
+    this.bus.send("opl-write", [3, value]);
@@ -631 +643,2 @@
-    dbg_log("228 write: fm music register port (unimplemented)", LOG_SB16);
+    dbg_log("228 write: fm music register port", LOG_SB16);
+    this.port2x0_write(value);
@@ -636 +649,2 @@
-    dbg_log("229 write: fm music data port (unimplemented)", LOG_SB16);
+    dbg_log("229 write: fm music data port", LOG_SB16);
+    this.port2x1_write(value);