Add support for Lord of the Dungeon (cartridge with SRAM)

drhelius · Dec 8, 2023 · 0b5784b · 0b5784b
1 parent d71744d
commit 0b5784b
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Showing 4 changed files with 41 additions and 6 deletions.
diff --git a/src/Cartridge.cpp b/src/Cartridge.cpp
@@ -35,6 +35,7 @@ Cartridge::Cartridge()
     m_szFileName[0] = 0;
     m_iROMBankCount = 0;
     m_bPAL = false;
+    m_bSRAM = false;
     m_iCRC = 0;
 }
 
@@ -59,6 +60,7 @@ void Cartridge::Reset()
     m_szFileName[0] = 0;
     m_iROMBankCount = 0;
     m_bPAL = false;
+    m_bSRAM = false;
     m_iCRC = 0;
 }
 
@@ -72,6 +74,11 @@ bool Cartridge::IsPAL() const
     return m_bPAL;
 }
 
+bool Cartridge::HasSRAM() const
+{
+    return m_bSRAM;
+}
+
 bool Cartridge::IsValidROM() const
 {
     return m_bValidROM;
@@ -306,6 +313,7 @@ bool Cartridge::LoadFromBuffer(const u8* buffer, int size)
 bool Cartridge::GatherMetadata(u32 crc)
 {
     m_bPAL = false;
+    m_bSRAM = false;
 
     Log("ROM Size: %d KB", m_iROMSize / 1024);
 
@@ -372,6 +380,12 @@ void Cartridge::GetInfoFromDB(u32 crc)
             found = true;
 
             Log("ROM found in database: %s. CRC: %X", kGameDatabase[i].title, crc);
+
+            if (kGameDatabase[i].mode & GC_GameDBMode_SRAM)
+            {
+                Log("Cartridge with SRAM");
+                m_bSRAM = true;
+            }
         }
         else
             i++;

diff --git a/src/Cartridge.h b/src/Cartridge.h
@@ -52,6 +52,7 @@ class Cartridge
     void Reset();
     u32 GetCRC() const;
     bool IsPAL() const;
+    bool HasSRAM() const;
     bool IsValidROM() const;
     bool IsReady() const;
     CartridgeTypes GetType() const;
@@ -80,6 +81,7 @@ class Cartridge
     int m_iROMBankCount;
     bool m_bPAL;
     u32 m_iCRC;
+    bool m_bSRAM;
 };
 
 #endif	/* CARTRIDGE_H */
diff --git a/src/Memory_inline.h b/src/Memory_inline.h
@@ -92,11 +92,23 @@ inline void Memory::Write(u16 address, u8 value)
         case 0x8000:
         case 0xA000:
         case 0xC000:
-        case 0xE000:
         {
             Log("--> ** Attempting to write on ROM: %X %X", address, value);
             break;
         }
+        case 0xE000:
+        {
+            if (m_pCartridge->HasSRAM() && (address >= 0xE000) && (address < 0xE800))
+            {
+                u8* pRom = m_pCartridge->GetROM();
+                pRom[(address + 0x800) & 0x7FFF] = value;
+            }
+            else
+            {
+                Log("--> ** Attempting to write on ROM: %X %X", address, value);
+            }
+            break;
+        }
     }
 }
 

diff --git a/src/game_db.h b/src/game_db.h
@@ -20,17 +20,24 @@
 #ifndef GAME_DB_H
 #define	GAME_DB_H
 
+enum GC_GameDBMode
+{
+	GC_GameDBMode_None = 0,
+	GC_GameDBMode_SRAM = 1,
+};
+
 struct GC_GameDBEntry
 {
-    u32 crc;
-    const char* title;
+	u32 crc;
+	const char* title;
+	GC_GameDBMode mode;
 };
 
 const GC_GameDBEntry kGameDatabase[] =
 {
-    {0xFFFFFFFF, "xxx"},
-        
-    {0, 0}
+	{0xFEE15196, "Lord of the Dungeon", GC_GameDBMode_SRAM},
+	{0x1053F610, "Lord of the Dungeon", GC_GameDBMode_SRAM},
+	{0, 0, GC_GameDBMode_None}
 };
 
 const uint32_t kCRC32_tab[] =