diff --git a/src/engine/platform/ay.cpp b/src/engine/platform/ay.cpp
index 2bcada1e8..0777fca8b 100644
--- a/src/engine/platform/ay.cpp
+++ b/src/engine/platform/ay.cpp
@@ -491,6 +491,12 @@ void DivPlatformAY8910::setFlags(unsigned int flags) {
     case 8:
       chipClock=COLOR_PAL*3.0/16.0;
       break;
+    case 9:
+      chipClock=COLOR_PAL/4.0;
+      break;
+    case 10:
+      chipClock=2097152;
+      break;
     default:
       chipClock=COLOR_NTSC/2.0;
       break;
diff --git a/src/engine/platform/ay8930.cpp b/src/engine/platform/ay8930.cpp
index 040800af6..d87045a64 100644
--- a/src/engine/platform/ay8930.cpp
+++ b/src/engine/platform/ay8930.cpp
@@ -552,6 +552,12 @@ void DivPlatformAY8930::setFlags(unsigned int flags) {
     case 8:
       chipClock=COLOR_PAL*3.0/16.0;
       break;
+    case 9:
+      chipClock=COLOR_PAL/4.0;
+      break;
+    case 10:
+      chipClock=2097152;
+      break;
     default:
       chipClock=COLOR_NTSC/2.0;
       break;
diff --git a/src/engine/song.h b/src/engine/song.h
index d1e255d95..e4bd428b0 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -194,6 +194,8 @@ struct DivSong {
   //     - 6: 0.89MHz (Sunsoft 5B)
   //     - 7: 1.67MHz
   //     - 8: 0.83MHz (Sunsoft 5B on PAL)
+  //     - 9: 1.10MHz (Gamate/VIC-20 PAL)
+  //     - 10: 2.097152MHz (Game Boy)
   //   - bit 4-5: chip type (ignored on AY8930)
   //     - 0: AY-3-8910 or similar
   //     - 1: YM2149
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index fa8900380..fb3e6fc31 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -4818,6 +4818,14 @@ bool FurnaceGUI::loop() {
                   e->setSysFlags(i,(flags&(~15))|8,restart);
                   updateWindowTitle();
                 }
+                if (ImGui::RadioButton("1.10MHz (Gamate/VIC-20 PAL)",(flags&15)==9)) {
+                  e->setSysFlags(i,(flags&(~15))|9,restart);
+                  updateWindowTitle();
+                }
+                if (ImGui::RadioButton("2^21Hz (Game Boy)",(flags&15)==10)) {
+                  e->setSysFlags(i,(flags&(~15))|10,restart);
+                  updateWindowTitle();
+                }
                 if (e->song.system[i]==DIV_SYSTEM_AY8910) {
                   ImGui::Text("Chip type:");
                   if (ImGui::RadioButton("AY-3-8910",(flags&0x30)==0)) {