Add various system, Minor corrections

YM2413 (drums mode)
 Standalone YM2413 with allows drum channel.

Sound Expander for Commodore 64
 OPL FM Sound expander cartridge for Commodore 64, it's placeholder until OPL is implemented.

MSX-MUSIC:
 MSX's sound standard, appeared after MSX-AUDIO. it's basically OPLL FM sound expansion for MSX.

SSI 2001:
 ISA Sound card with SID 6581. SID input clock is driven from ISA clock, so I modified flags value check routine.

Sound Blaster w/Game Blaster Compatible
 Earliest Sound Blaster models has featured with Game Blaster compatiblity, It's has 2 SAA1099s like CMS/Game Blaster. It's removed at later models, but some hardware has just empty socket; you can restore this feature when you mount SAA1099 at empty socket.

Sharp X1:
 Predecessor of X68000. it has built in AY PSG like competitors of the same period, but it has YM2151 FM sound addon in later models. FM sound is embedded in turbo Z, and that is succeeded by X68000.

X68000 hasn't AY, instead OKI MSM6258.
YM2151 in OutRun Board and X Board is 4MHz

src/engine/platform/c64.cpp

@@ -509,10 +509,17 @@ void DivPlatformC64::setChipModel(bool is6581) {
 }
 
 void DivPlatformC64::setFlags(unsigned int flags) {
-  if (flags&1) {
+  switch (flags&0xf) {
-    rate=COLOR_PAL*2.0/9.0;
+	case 0x0: // NTSC C64
-  } else {
+      rate=COLOR_NTSC*2.0/7.0;
-    rate=COLOR_NTSC*2.0/7.0;
+	  break;
+	case 0x1: // PAL C64
+      rate=COLOR_PAL*2.0/9.0;
+	  break;
+	case 0x2: // SSI 2001
+	default:
+      rate=14318180.0/16.0;
+	  break;
   }
   chipClock=rate;
 }

src/gui/gui.cpp

@@ -4714,7 +4714,7 @@ bool FurnaceGUI::loop() {
                   e->setSysFlags(i,1,restart);
                   updateWindowTitle();
                 }
-                if (ImGui::RadioButton("X68000 (4MHz)",flags==2)) {
+                if (ImGui::RadioButton("X1/X68000 (4MHz)",flags==2)) {
                   e->setSysFlags(i,2,restart);
                   updateWindowTitle();
                 }
@@ -4733,6 +4733,21 @@ bool FurnaceGUI::loop() {
                   updateWindowTitle();
                 }
                 break;
+              case DIV_SYSTEM_C64_8580:
+              case DIV_SYSTEM_C64_6581:
+                if (ImGui::RadioButton("NTSC (1.02MHz)",flags==0)) {
+                  e->setSysFlags(i,0,restart);
+                  updateWindowTitle();
+                }
+                if (ImGui::RadioButton("PAL (0.99MHz)",flags==1)) {
+                  e->setSysFlags(i,1,restart);
+                  updateWindowTitle();
+                }
+                if (ImGui::RadioButton("SSI 2001 (0.89MHz)",flags==2)) {
+                  e->setSysFlags(i,2,restart);
+                  updateWindowTitle();
+                }
+                break;
               case DIV_SYSTEM_AY8910:
               case DIV_SYSTEM_AY8930: {
                 ImGui::Text("Clock rate:");
@@ -4748,7 +4763,7 @@ bool FurnaceGUI::loop() {
                   e->setSysFlags(i,(flags&(~15))|2,restart);
                   updateWindowTitle();
                 }
-                if (ImGui::RadioButton("2MHz (Atari ST)",(flags&15)==3)) {
+                if (ImGui::RadioButton("2MHz (Atari ST/Sharp X1)",(flags&15)==3)) {
                   e->setSysFlags(i,(flags&(~15))|3,restart);
                   updateWindowTitle();
                 }
@@ -6157,6 +6172,12 @@ FurnaceGUI::FurnaceGUI():
       0
     }
   ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "Yamaha YM2413 (drums mode)", {
+      DIV_SYSTEM_OPLL_DRUMS, 64, 0, 0,
+      0
+    }
+  ));
   sysCategories.push_back(cat);
 
   cat=FurnaceGUISysCategory("Square");
@@ -6331,6 +6352,35 @@ FurnaceGUI::FurnaceGUI():
       0
     }
   ));
+  /*
+  cat.systems.push_back(FurnaceGUISysDef(
+    "Commodore 64 (6581 SID + Sound Expander)", {
+      DIV_SYSTEM_OPL, 64, 0, 0,
+      DIV_SYSTEM_C64_6581, 64, 0, 1,
+      0
+    }
+  ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "Commodore 64 (6581 SID + Sound Expander with drums mode)", {
+      DIV_SYSTEM_OPL_DRUMS, 64, 0, 0,
+      DIV_SYSTEM_C64_6581, 64, 0, 1,
+      0
+    }
+  ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "Commodore 64 (8580 SID + Sound Expander)", {
+      DIV_SYSTEM_OPL, 64, 0, 0,
+      DIV_SYSTEM_C64_8580, 64, 0, 1,
+      0
+    }
+  ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "Commodore 64 (8580 SID + Sound Expander with drums mode)", {
+      DIV_SYSTEM_OPL_DRUMS, 64, 0, 0,
+      DIV_SYSTEM_C64_8580, 64, 0, 1,
+      0
+    }
+  ));*/
   cat.systems.push_back(FurnaceGUISysDef(
     "Amiga", {
       DIV_SYSTEM_AMIGA, 64, 0, 0,
@@ -6343,6 +6393,20 @@ FurnaceGUI::FurnaceGUI():
       0
     }
   ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "MSX + MSX-MUSIC", {
+      DIV_SYSTEM_OPLL, 64, 0, 0,
+      DIV_SYSTEM_AY8910, 64, 0, 16,
+      0
+    }
+  ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "MSX + MSX-MUSIC (drums mode)", {
+      DIV_SYSTEM_OPLL_DRUMS, 64, 0, 0,
+      DIV_SYSTEM_AY8910, 64, 0, 16,
+      0
+    }
+  ));
   cat.systems.push_back(FurnaceGUISysDef(
     "ZX Spectrum (48K)", {
       DIV_SYSTEM_AY8910, 64, 0, 2,
@@ -6386,6 +6450,13 @@ FurnaceGUI::FurnaceGUI():
       0
     }
   ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "PC + SSI 2001", {
+      DIV_SYSTEM_C64_6581, 64, 0, 2,
+      DIV_SYSTEM_PCSPKR, 64, 0, 0,
+      0
+    }
+  ));
   cat.systems.push_back(FurnaceGUISysDef(
     "PC + Game Blaster", {
       DIV_SYSTEM_SAA1099, 64, -127, 1,
@@ -6408,6 +6479,24 @@ FurnaceGUI::FurnaceGUI():
       0
     }
   ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "PC + Sound Blaster w/Game Blaster Compatible", {
+      DIV_SYSTEM_OPL2, 64, 0, 0,
+      DIV_SYSTEM_SAA1099, 64, -127, 1,
+      DIV_SYSTEM_SAA1099, 64, 127, 1,
+      DIV_SYSTEM_PCSPKR, 64, 0, 0,
+      0
+    }
+  ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "PC + Sound Blaster w/Game Blaster Compatible (drums mode)", {
+      DIV_SYSTEM_OPL2_DRUMS, 64, 0, 0,
+      DIV_SYSTEM_SAA1099, 64, -127, 1,
+      DIV_SYSTEM_SAA1099, 64, 127, 1,
+      DIV_SYSTEM_PCSPKR, 64, 0, 0,
+      0
+    }
+  ));
   cat.systems.push_back(FurnaceGUISysDef(
     "PC + Sound Blaster Pro 2", {
       DIV_SYSTEM_OPL3, 64, 0, 0,
@@ -6422,10 +6511,24 @@ FurnaceGUI::FurnaceGUI():
       0
     }
   ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "Sharp X1", {
+      DIV_SYSTEM_AY8910, 64, 0, 3,
+      0
+    }
+  ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "Sharp X1 + FM Addon", {
+      DIV_SYSTEM_AY8910, 64, 0, 3,
+      DIV_SYSTEM_YM2151, 64, 0, 2,
+      0
+    }
+  ));
   /*
   cat.systems.push_back(FurnaceGUISysDef(
     "Sharp X68000", {
-      DIV_SYSTEM_AY8910, 64, 0, 16,
+      DIV_SYSTEM_YM2151, 64, 0, 2,
+      DIV_SYSTEM_MSM6258, 64, 0, 0,
       0
     }
   ));*/
@@ -6448,7 +6551,7 @@ FurnaceGUI::FurnaceGUI():
   ));
   cat.systems.push_back(FurnaceGUISysDef(
     "Sega OutRun/X Board", {
-      DIV_SYSTEM_YM2151, 64, 0, 0,
+      DIV_SYSTEM_YM2151, 64, 0, 2,
       DIV_SYSTEM_SEGAPCM, 64, 0, 0,
       0
     }
@@ -6552,7 +6655,7 @@ FurnaceGUI::FurnaceGUI():
   ));
   cat.systems.push_back(FurnaceGUISysDef(
     "Arcade (YM2151 and SegaPCM)", {
-      DIV_SYSTEM_YM2151, 64, 0, 0,
+      DIV_SYSTEM_YM2151, 64, 0, 2,
       DIV_SYSTEM_SEGAPCM_COMPAT, 64, 0, 0,
       0
     }