Split project into multiple files

src/cpu.h

@@ -0,0 +1,55 @@
+//
+// Created by Palindromic Bread Loaf on 7/21/25.
+//
+
+#ifndef CPU_H
+#define CPU_H
+#include "bus.h"
+
+// 65816 CPU implementation
+class CPU {
+private:
+    // Registers
+    uint16_t A;     // Accumulator
+    uint16_t X, Y;  // Index registers
+    uint16_t SP;    // Stack pointer
+    uint32_t PC;    // Program counter (24-bit)
+    uint8_t P;      // Processor status
+    uint8_t DB;     // Data bank
+    uint8_t PB;     // Program bank
+    uint16_t D;     // Direct page
+
+    Bus* bus;
+    uint64_t cycles;
+
+    // Status flags
+    enum Flags {
+        FLAG_C = 0x01,  // Carry
+        FLAG_Z = 0x02,  // Zero
+        FLAG_I = 0x04,  // IRQ disable
+        FLAG_D = 0x08,  // Decimal mode
+        FLAG_X = 0x10,  // Index register size (0=16-bit, 1=8-bit)
+        FLAG_M = 0x20,  // Memory/Accumulator size (0=16-bit, 1=8-bit)
+        FLAG_V = 0x40,  // Overflow
+        FLAG_N = 0x80   // Negative
+    };
+
+public:
+    CPU(Bus* memory_bus) : bus(memory_bus) {
+        Reset();
+    }
+
+    void Reset();
+    void Step();
+    void ExecuteInstruction();
+    uint64_t GetCycles() const { return cycles; }
+
+    // Instruction implementations
+    // TODO: Implement remaining instructions
+    void NOP();
+    void LDA();
+    void STA();
+    void JMP();
+};
+
+#endif //CPU_H