match cpu registers on reset to hardware, cleanup

src/app/emu/cpu/cpu.cc

@@ -21,8 +21,8 @@ void Cpu::Reset(bool hard) {
     PB = 0;
     D = 0;
     DB = 0;
-    E = 0;
-    status = 0;
+    E = 1;
+    status = 0x34;
     irq_wanted_ = false;
   }
 
@@ -34,24 +34,6 @@ void Cpu::Reset(bool hard) {
   int_delay_ = false;
 }
 
-void Cpu::Update(UpdateMode mode, int stepCount) {
-  int cycles = (mode == UpdateMode::Run) ? clock.GetCycleCount() : stepCount;
-
-  // Execute the calculated number of cycles
-  for (int i = 0; i < cycles; i++) {
-    if (IsBreakpoint(PC)) {
-      break;
-    }
-
-    // Fetch and execute an instruction
-    ExecuteInstruction(ReadByte((PB << 16) + PC));
-
-    if (mode == UpdateMode::Step) {
-      break;
-    }
-  }
-}
-
 void Cpu::RunOpcode() {
   if (reset_wanted_) {
     reset_wanted_ = false;

src/app/emu/cpu/cpu.h

@@ -36,18 +36,12 @@ class InstructionEntry {
   std::string instruction;  // Human-readable instruction text
 };
 
-const int kCpuClockSpeed = 21477272;  // 21.477272 MHz
-
 class Cpu : public Loggable, public core::ExperimentFlags {
  public:
   explicit Cpu(memory::Memory& mem, Clock& vclock,
                memory::CpuCallbacks& callbacks)
       : memory(mem), clock(vclock), callbacks_(callbacks) {}
-  enum class UpdateMode { Run, Step, Pause };
-
-  void Init(bool verbose = false) { clock.SetFrequency(kCpuClockSpeed); }
   void Reset(bool hard = false);
-  void Update(UpdateMode mode = UpdateMode::Run, int stepCount = 1);
 
   void RunOpcode();