Implement LOAD Instructions

src/cpu.h

@@ -32,6 +32,8 @@ private:
         FLAG_M = 0x20,  // Memory/Accumulator size (0=16-bit, 1=8-bit)
         FLAG_V = 0x40,  // Overflow
         FLAG_N = 0x80   // Negative
+        // FLAG_E = ??? // 6502 Emulation Mode
+        // FLAG_B = 0x10 //Break
     };
 
 public:
@@ -42,14 +44,46 @@ public:
     void Reset();
     void Step();
     void ExecuteInstruction();
-    uint64_t GetCycles() const { return cycles; }
+    [[nodiscard]] uint64_t GetCycles() const { return cycles; }
+
+    // Addressing mode helpers
+    uint32_t GetEffectiveAddress(uint8_t mode);
+    uint8_t ReadByte(uint32_t address);
+    uint16_t ReadWord(uint32_t address);
+    void UpdateNZ8(uint8_t value);
+    void UpdateNZ16(uint16_t value);
 
     // Instruction implementations
     // TODO: Implement remaining instructions
-    void NOP();
-    void LDA();
-    void STA();
     void JMP();
+
+    static void NOP();
+
+    void LDA_Immediate();
+    void LDA_Absolute();
+    void LDA_AbsoluteX();
+    void LDA_AbsoluteY();
+    void LDA_DirectPage();
+    void LDA_DirectPageX();
+    void LDA_IndirectDirectPage();
+    void LDA_IndirectDirectPageY();
+    void LDA_DirectPageIndirectX();
+    void LDA_Long();
+    void LDA_LongX();
+
+    void LDX_Immediate();
+    void LDX_Absolute();
+    void LDX_AbsoluteY();
+    void LDX_DirectPage();
+    void LDX_DirectPageY();
+
+    void LDY_Immediate();
+    void LDY_Absolute();
+    void LDY_AbsoluteX();
+    void LDY_DirectPage();
+    void LDY_DirectPageX();
+
+    void STA();
 };
 
 #endif //CPU_H