Split project into multiple files

src/cpu.cpp

@@ -0,0 +1,54 @@
+//
+// Created by Palindromic Bread Loaf on 7/21/25.
+//
+
+#include "cpu.h"
+
+#include <iostream>
+
+// CPU Implementation
+void CPU::Reset() {
+    A = X = Y = 0;
+    SP = 0x01FF;
+    PC = 0x8000;  // Will be loaded from reset vector
+    P = 0x34;     // Start in emulation mode
+    DB = PB = 0;
+    D = 0;
+    cycles = 0;
+}
+
+void CPU::Step() {
+    ExecuteInstruction();
+}
+
+void CPU::ExecuteInstruction() {
+    uint8_t opcode = bus->Read(PC++);
+
+    // TODO: Actual Opcode decoding
+    switch (opcode) {
+        case 0xEA: NOP(); break;
+        case 0xA9: LDA(); break;
+
+        default:
+            std::cout << "Unknown opcode: 0x" << std::hex << (int)opcode << std::endl;
+            break;
+    }
+
+    cycles++;
+}
+
+void CPU::NOP() {
+    // No operation
+}
+
+void CPU::LDA() {
+    // Load accumulator - immediate mode
+    if (P & FLAG_M) {
+        // 8-bit mode
+        A = (A & 0xFF00) | bus->Read(PC++);
+    } else {
+        // 16-bit mode
+        A = bus->Read16(PC);
+        PC += 2;
+    }
+}