- PCI bridge can be specified in Games.xml for games that use a different version than expected based on stepping. No more hard-coded exceptions.

- Real3D PCI ID can be specified in Games.xml for exceptions that require it.
- Real3D status bit timing specified in Games.xml for exceptions that require it.

Config/Games.xml

@@ -19,6 +19,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>1.0</stepping>
+      <pci_bridge>MPC106</pci_bridge>
       <inputs>
         <input type="common" />
         <input type="fishing" />
@@ -86,6 +87,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>1.0</stepping>
+      <pci_bridge>MPC106</pci_bridge>
       <inputs>
         <input type="common" />
         <input type="fishing" />
@@ -110,6 +112,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>1.0</stepping>
+      <pci_bridge>MPC106</pci_bridge>
       <inputs>
         <input type="common" />
         <input type="fishing" />
@@ -141,6 +144,7 @@
       <platform>Sega Model 3</platform>
       <stepping>2.1</stepping>
       <mpeg_board>DSB2</mpeg_board>
+      <real3d_status_bit_set_percent_of_frame>24</real3d_status_bit_set_percent_of_frame>
       <inputs>
         <input type="common" />
         <input type="vehicle" />
@@ -320,6 +324,7 @@
       <platform>Sega Model 3</platform>
       <stepping>2.1</stepping>
       <mpeg_board>DSB2</mpeg_board>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="vehicle" />
@@ -392,6 +397,7 @@
       <platform>Sega Model 3</platform>
       <stepping>2.1</stepping>
       <mpeg_board>DSB2</mpeg_board>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="vehicle" />
@@ -426,6 +432,7 @@
       <platform>Sega Model 3</platform>
       <stepping>2.1</stepping>
       <mpeg_board>DSB2</mpeg_board>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="vehicle" />
@@ -460,6 +467,7 @@
       <platform>Sega Model 3</platform>
       <stepping>2.1</stepping>
       <mpeg_board>DSB2</mpeg_board>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="vehicle" />
@@ -686,6 +694,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>2.0</stepping>
+      <real3d_status_bit_set_percent_of_frame>24</real3d_status_bit_set_percent_of_frame>
       <inputs>
         <input type="common" />
         <input type="joystick1" />
@@ -763,6 +772,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>2.0</stepping>
+      <real3d_status_bit_set_percent_of_frame>24</real3d_status_bit_set_percent_of_frame>
       <inputs>
         <input type="common" />
         <input type="joystick1" />
@@ -891,6 +901,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>2.1</stepping>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="analog_gun1" />
@@ -1150,6 +1161,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>2.1</stepping>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="magtruck" />
@@ -1508,6 +1520,7 @@
       <platform>Sega Model 3</platform>
       <stepping>1.5</stepping>
       <mpeg_board>DSB1</mpeg_board>
+      <pci_bridge>MPC106</pci_bridge>
       <inputs>
         <input type="common" />
         <input type="vehicle" />
@@ -2078,10 +2091,14 @@
       <year>1998</year>
     </identity>
     <hardware>
+      <!--
+        To get this running at full speed, set PowerPC frequency to 100 MHz on
+        command line or in INI file.
+      -->
       <platform>Sega Model 3</platform>
       <stepping>2.0</stepping>
-      <!-- Spindizzi notes : Add mpeg soundboard -->
       <mpeg_board>DSB2</mpeg_board>
+      <real3d_status_bit_set_percent_of_frame>48</real3d_status_bit_set_percent_of_frame>
       <inputs>
         <input type="common" />
         <input type="vehicle" />
@@ -2544,6 +2561,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>2.0</stepping>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="twin_joysticks" />
@@ -2619,6 +2637,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>2.0</stepping>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="twin_joysticks" />
@@ -2645,6 +2664,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>2.0</stepping>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="twin_joysticks" />
@@ -2671,6 +2691,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>2.0</stepping>
+      <real3d_pci_id>0x16C311DB</real3d_pci_id>
       <inputs>
         <input type="common" />
         <input type="twin_joysticks" />
@@ -2771,6 +2792,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>1.5</stepping>
+      <pci_bridge>MPC106</pci_bridge>
       <inputs>
         <input type="common" />
         <input type="joystick1" />
@@ -2798,6 +2820,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>1.5</stepping>
+      <pci_bridge>MPC106</pci_bridge>
       <inputs>
         <input type="common" />
         <input type="joystick1" />
@@ -2912,6 +2935,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>1.5</stepping>
+      <pci_bridge>MPC106</pci_bridge>
       <inputs>
         <input type="common" />
         <input type="joystick1" />
@@ -3041,6 +3065,7 @@
     <hardware>
       <platform>Sega Model 3</platform>
       <stepping>1.5</stepping>
+      <pci_bridge>MPC106</pci_bridge>
       <inputs>
         <input type="common" />
         <input type="joystick1" />

Src/Game.h

@@ -14,6 +14,9 @@ struct Game
   unsigned year = 0;
   std::string stepping;
   std::string mpeg_board;
+  std::string pci_bridge;               // overrides default PCI bridge type for stepping (empty string for default)
+  uint32_t real3d_pci_id = 0;           // overrides default Real3D PCI ID for stepping (0 for default)
+  float real3d_status_bit_set_percent_of_frame = 0; // overrides default status bit timing (0 for default)
   uint32_t encryption_key = 0;
   enum Inputs
   {

Src/GameLoader.cpp

@@ -197,6 +197,9 @@ static void PopulateGameInfo(Game *game, const Util::Config::Node &game_node)
   game->year = game_node["identity/year"].ValueAsDefault<unsigned>(0);
   game->stepping = game_node["hardware/stepping"].ValueAsDefault<std::string>("");
   game->mpeg_board = game_node["hardware/mpeg_board"].ValueAsDefault<std::string>("");
+  game->pci_bridge = game_node["hardware/pci_bridge"].ValueAsDefault<std::string>("");
+  game->real3d_pci_id = game_node["hardware/real3d_pci_id"].ValueAsDefault<uint32_t>(0);
+  game->real3d_status_bit_set_percent_of_frame = game_node["hardware/real3d_status_bit_set_percent_of_frame"].ValueAsDefault<float>(0);
   game->encryption_key = game_node["hardware/encryption_key"].ValueAsDefault<uint32_t>(0);
   std::map<std::string, uint32_t> input_flags
   {

Src/Model3/MPC10x.cpp

@@ -1,7 +1,7 @@
 /**
  ** Supermodel
  ** A Sega Model 3 Arcade Emulator.
- ** Copyright 2011 Bart Trzynadlowski, Nik Henson 
+ ** Copyright 2011-2019 Bart Trzynadlowski, Nik Henson, Ian Curtis
  **
  ** This file is part of Supermodel.
  **
@@ -319,6 +319,16 @@ void CMPC10x::SetModel(int modelNum)
 	DebugLog("MPC10x set to MPC%X\n", model);
 }
 
+/*
+ * CMPC10x::GetModel():
+ *
+ * Returns the model number.
+ */
+int CMPC10x::GetModel() const
+{
+  return model;
+}
+
 /*
  * CMPC10x::Init():
  *

Src/Model3/MPC10x.h

@@ -146,6 +146,14 @@ public:
 	 *					to MPC105 if unrecognized.
 	 */
 	void SetModel(int modelNum);
+
+  /*
+   * GetModel(void):
+   *
+   * Returns:
+   *    The PCI bridge model number, either 0x105 or 0x106.
+   */
+  int GetModel() const; 
 	 
 	/*
 	 * Init(void):

Src/Model3/Model3.cpp

@@ -1,7 +1,7 @@
 /**
  ** Supermodel
  ** A Sega Model 3 Arcade Emulator.
- ** Copyright 2011-2016 Bart Trzynadlowski, Nik Henson 
+ ** Copyright 2011-2019 Bart Trzynadlowski, Nik Henson, Ian Curtis
  **
  ** This file is part of Supermodel.
  **
@@ -553,12 +553,20 @@ UINT8 CModel3::ReadInputs(unsigned reg)
       adc[1] = (UINT8)Inputs->analogGunX[1]->value;
       adc[3] = (UINT8)Inputs->analogGunY[1]->value;
 
-	  if (m_game.name == "lostwsga" || m_game.name == "lostwsgo") { // to do, not a string compare
+  	  /*
+  	  // Unclear why this is necessary or how to cleanly fix it, so I'm
+  	  // disabling it but leaving it here for future reference. The proper fix is
+  	  // probably to allow users to define inverted controls for this game only,
+  	  // which means the input system must support loading per-game config (not
+  	  // all analog_gun games require axis inversion to be playable).
+	    if (m_game.name == "lostwsga" || m_game.name == "lostwsgo")
+	    { // to do, not a string compare
         adc[0] =       (UINT8)Inputs->analogGunX[0]->value; // order is different for some reason in lost world
         adc[1] = 255 - (UINT8)Inputs->analogGunY[0]->value; // why are values inverted? is this the wrong place to fix this
         adc[2] =       (UINT8)Inputs->analogGunX[1]->value;
         adc[3] = 255 - (UINT8)Inputs->analogGunY[1]->value;
       }
+      */
     }
     
     if ((m_game.inputs & Game::INPUT_SKI))
@@ -2205,32 +2213,29 @@ void CModel3::RunMainBoardFrame(void)
   unsigned vblCycles   = (unsigned)((float) frameCycles * 2.5f/100.0f); // 2.5% vblank (ridiculously short and wrong but bigger values cause flicker in Daytona)
   unsigned dispCycles  = frameCycles - vblCycles;
   
-  // Scale PPC timer ratio according to speed at which the PowerPC is being emulated so that the observed running frequency of the PPC timer
+  // For some reason, some Step 2.x games require completely different timings. The defaults can be overriden in the ROM set XML file.
-  // registers is more or less correct.  This is needed to get the Virtua Striker 2 series of games running at the right speed (they are 
+  float real3DStatusBitSetAsPercentOfFrame = m_game.real3d_status_bit_set_percent_of_frame;
-  // too slow otherwise).  Other games appear to not be affected by this ratio so much as their running speed depends more on the timing of
+  if (real3DStatusBitSetAsPercentOfFrame <= 0)
-  // the Real3D status bit below.
+  {
-  ppc_set_timer_ratio(ppc_get_bus_freq_multipler() * 2 * ppcCycles / ppc_get_cycles_per_sec());
+    if (m_game.stepping == "2.0" || m_game.stepping == "2.1")
+      real3DStatusBitSetAsPercentOfFrame = 9.12f;
+    else if (m_game.stepping == "1.5")
+      real3DStatusBitSetAsPercentOfFrame = 5.5f;
+    else
+      real3DStatusBitSetAsPercentOfFrame = 48.0f;
+  }
   
   // Compute timing of the Real3D status bit.  This value directly affects the speed at which all the games except Virtua Stiker 2 run.
   // Currently it is not known exactly what this bit represents nor why such wildly varying values are needed for the different step models.
   // The values below were arrived at by trial and error and clearly more investigation is required.  If it turns out that the status bit is
   // connected to the end of VBlank then the code below should be removed and the timing handled via GPU.VBlankEnd() instead.  
-  unsigned statusCycles;
+  unsigned statusCycles = (unsigned) ((float) frameCycles * (real3DStatusBitSetAsPercentOfFrame * 1e-2f));  
-  if (m_game.stepping == "2.0" || m_game.stepping == "2.1")
+  
-  {
+  // Scale PPC timer ratio according to speed at which the PowerPC is being emulated so that the observed running frequency of the PPC timer
-    // For some reason, Fighting Vipers 2 and Daytona USA 2 require completely different timing to the rest of the step 2.x games
+  // registers is more or less correct.  This is needed to get the Virtua Striker 2 series of games running at the right speed (they are 
-    if (m_game.name == "daytona2" || (m_game.stepping == "2.0" && (m_game.name == "fvipers2" || m_game.name == "fvipers2o")))
+  // too slow otherwise).  Other games appear to not be affected by this ratio so much as their running speed depends more on the timing of
-      statusCycles = (unsigned)((float)frameCycles * 24.0f/100.0f);
+  // the Real3D status bit below.
-	// Spindizzi notes : this little hack timing allow srally2x to run full speed (for test purpose only)
+  ppc_set_timer_ratio(ppc_get_bus_freq_multipler() * 2 * ppcCycles / ppc_get_cycles_per_sec());
-	else if (m_game.name == "srally2x") // need ppc=100 also (edit ini or add option in command line)
-	  statusCycles = (unsigned)((float)frameCycles * 48.0f / 100.0f);
-	else
-      statusCycles = (unsigned)((float)frameCycles * 9.12f/100.0f);
-  }
-  else if (m_game.stepping == "1.5")
-    statusCycles = (unsigned)((float)frameCycles * 5.5f/100.0f);
-  else
-    statusCycles = (unsigned)((float)frameCycles * 48.0f/100.0f);
 
   // VBlank
   if (gpusReady)
@@ -3089,44 +3094,46 @@ bool CModel3::LoadGame(const Game &game, const ROMSet &rom_set)
   Util::FlipEndian16(soundROM, 512*1024);
   Util::FlipEndian16(sampleROM, 16*0x100000);
 
-  // Initialize CPU
+  // Configure CPU and PCI bridge
   PPC_CONFIG  ppc_config;
   if (game.stepping == "2.0" || game.stepping == "2.1")
   {
-    ppc_config.pvr = PPC_MODEL_603R;   // 166 MHz
+    ppc_config.pvr = PPC_MODEL_603R;  // 166 MHz
     ppc_config.bus_frequency = BUS_FREQUENCY_66MHZ;
     ppc_config.bus_frequency_multiplier = 0x25; // 2.5X multiplier
     PCIBridge.SetModel(0x106);        // MPC106
   } 
   else if (game.stepping == "1.5")
   {
-    ppc_config.pvr = PPC_MODEL_603E;   // 100 MHz
+    ppc_config.pvr = PPC_MODEL_603E;  // 100 MHz
     ppc_config.bus_frequency = BUS_FREQUENCY_66MHZ;
     ppc_config.bus_frequency_multiplier = 0x15; // 1.5X multiplier
-    if (game.name == "scudplusa"
+    PCIBridge.SetModel(0x105);        // MPC105
-     || game.name == "vs215" || game.name == "vs215o"
-     || game.name == "vs29815" || game.name == "vs29915"
-    )
-      PCIBridge.SetModel(0x106);      // some Step 1.x games use MPC106
-    else
-      PCIBridge.SetModel(0x105);      // MPC105
   }
   else if (game.stepping == "1.0")
   {
-    ppc_config.pvr = PPC_MODEL_603R;   // 66 MHz
+    ppc_config.pvr = PPC_MODEL_603R;  // 66 MHz
     ppc_config.bus_frequency = BUS_FREQUENCY_66MHZ;
     ppc_config.bus_frequency_multiplier = 0x10; // 1X multiplier
-    if (game.name == "bass" || game.name == "bassdx" || game.name == "getbass")
+    PCIBridge.SetModel(0x105);        // MPC105
-
-      PCIBridge.SetModel(0x106);      // some Step 1.x games use MPC106
-    else
-      PCIBridge.SetModel(0x105);      // MPC105
   }
   else
   {
     ErrorLog("Cannot configure Model 3 because game uses unrecognized stepping (%s).", game.stepping.c_str());
     return FAIL;
   }
+  
+  if (!game.pci_bridge.empty())
+  {
+    if (game.pci_bridge == "MPC105")
+      PCIBridge.SetModel(0x105);
+    else if (game.pci_bridge == "MPC106")
+      PCIBridge.SetModel(0x106);
+    else
+      ErrorLog("Unknown PCI bridge specified in ROM set definition file (%s). Defaulting to MPC%X.", game.pci_bridge.c_str(), PCIBridge.GetModel());
+  }
+  
+  // Initialize CPU
   ppc_init(&ppc_config);
   ppc_attach_bus(this);
   PPCFetchRegions[0].start = 0; 
@@ -3141,18 +3148,13 @@ bool CModel3::LoadGame(const Game &game, const ROMSet &rom_set)
   ppc_set_fetch(PPCFetchRegions);
   
   // Initialize Real3D 
-  int stepping = ((game.stepping[0] - '0') << 4) | (game.stepping[2] - '0');
+  int stepping = ((game.stepping[0] - '0') << 4) | (game.stepping[2] - '0');
-  // Some step 2+ games need the older PCI ID (obvious symptom:
+  uint32_t real3DPCIID = game.real3d_pci_id;
-  // vbl is enabled briefly then disabled so the game hangs)
+  if (0 == real3DPCIID)
-  bool step20_with_old_real3d;
+  {
-  if (game.name == "von2" || game.name == "von2a" || game.name == "von254g" || game.name == "von2o"
+    real3DPCIID = stepping >= 0x20 ? CReal3D::PCIID::Step2x : CReal3D::PCIID::Step1x;
-   || game.name == "dirtdvls" || game.name == "dirtdvlsa" || game.name == "dirtdvlsj" || game.name == "dirtdvlsg"
+  }
-   || game.name == "magtruck" || game.name == "lamachin"
+  GPU.SetStepping(stepping, real3DPCIID);
-  )
-    step20_with_old_real3d = true;
-  else
-    step20_with_old_real3d = false;
-  GPU.SetStepping(stepping, step20_with_old_real3d);
   
   // MPEG board (if present)
   if (rom_set.get_rom("mpeg_program").size)

Src/Model3/Real3D.cpp

@@ -883,7 +883,7 @@ uint32_t CReal3D::GetASICIDCode(ASIC asic) const
   return it == m_asicID.end() ? 0 : it->second;
 }
 
-void CReal3D::SetStepping(int stepping, bool step20_with_old_real3d)
+void CReal3D::SetStepping(int stepping, uint32_t pciIDValue)
 
 {
   step = stepping;
@@ -894,12 +894,7 @@ void CReal3D::SetStepping(int stepping, bool step20_with_old_real3d)
   }
 
   // Set PCI ID
-  // Some step 2+ games need the older PCI ID (obvious symptom:
+  pciID = pciIDValue;
-  // vbl is enabled briefly then disabled so the game hangs)
-  if ((step < 0x20) || step20_with_old_real3d)      
-    pciID = 0x16C311DB; // vendor 0x11DB = Sega
-  else
-    pciID = 0x178611DB;
     
   // Pass to renderer
   if (Render3D != NULL)

Src/Model3/Real3D.h

@@ -59,6 +59,22 @@ struct QueuedUploadTextures
 class CReal3D: public IPCIDevice
 {
 public:
+  /*
+   * PCI IDs
+   *
+   * The CReal3D object must be configured with the desired ID. Some Step 2.x
+   * appear to defy this and expect the 1.x ID. The symptom of this is that 
+   * VBL is enabled briefly then disabled. This should be investigated further.
+   * Perhaps a different ASIC's PCI ID is being read in these situations?
+   *
+   * The vendor ID code 0x11db is Sega's.
+   */
+  enum PCIID: uint32_t
+  {
+    Step1x = 0x16C311DB,  // Step 1.x
+    Step2x = 0x178611DB   // Step 2.x
+  };
+
   /*
    * ASIC Names
    *
@@ -352,17 +368,22 @@ public:
   uint32_t GetASICIDCode(ASIC asic) const;
 
   /*
-   * SetStepping(stepping):
+   * SetStepping(stepping, pciIDValue):
    *
    * Sets the Model 3 hardware stepping, which also determines the Real3D
    * functionality. The default is Step 1.0. This should be called prior to 
    * any other emulation functions and after Init().
    *
    * Parameters:
-   *    stepping  0x10 for Step 1.0, 0x15 for Step 1.5, 0x20 for Step 2.0, or
+   *    stepping    0x10 for Step 1.0, 0x15 for Step 1.5, 0x20 for Step 2.0, or
-   *              0x21 for Step 2.1. Anything else defaults to 1.0.
+   *                0x21 for Step 2.1. Anything else defaults to 1.0.
+   *    pciIDValue  The PCI ID code to return. This should be one of the PCIID
+   *                enum values otherwise games may fail to boot. Although the
+   *                PCI ID depends on stepping, there are a few games that
+   *                have to be explicitly configured with an older ID code,
+   *                which is why this parameter is exposed.
    */
-  void SetStepping(int stepping, bool step20_with_old_real3d);
+  void SetStepping(int stepping, uint32_t pciIDValue);
 
   
   /*

Src/OSD/SDL/Main.cpp

@@ -1365,7 +1365,7 @@ static Util::Config::Node DefaultConfig()
 static void Title(void)
 {
   puts("Supermodel: A Sega Model 3 Arcade Emulator (Version " SUPERMODEL_VERSION ")");
-  puts("Copyright 2011-2018 by Bart Trzynadlowski, Nik Henson, Ian Curtis,");
+  puts("Copyright 2011-2019 by Bart Trzynadlowski, Nik Henson, Ian Curtis,");
   puts("                       Harry Tuttle, and Spindizzi\n");
 }