update apu ram management

src/app/emu/audio/apu.cc

@@ -31,12 +31,26 @@ static const uint8_t bootRom[0x40] = {
 void Apu::Init() {
   // Set the clock frequency
   clock_.SetFrequency(kApuClockSpeed);
+  ram.resize(0x10000);
+  for (int i = 0; i < 0x10000; i++) {
+    ram[i] = 0;
+  }
+  // Copy the boot rom into the ram at ffc0
+  for (int i = 0; i < 0x40; i++) {
+    ram[0xffc0 + i] = bootRom[i];
+  }
 }
 
 void Apu::Reset() {
   spc700_.Reset(true);
   dsp_.Reset();
-  ram.clear();
+  for (int i = 0; i < 0x10000; i++) {
+    ram[i] = 0;
+  }
+  // Copy the boot rom into the ram at ffc0
+  for (int i = 0; i < 0x40; i++) {
+    ram[0xffc0 + i] = bootRom[i];
+  }
   rom_readable_ = true;
   dsp_adr_ = 0;
   cycles_ = 0;
@@ -51,17 +65,6 @@ void Apu::Reset() {
   }
 }
 
-void Apu::Update() {
-  auto cycles_to_run = clock_.GetCycleCount();
-
-  for (auto i = 0; i < cycles_to_run; ++i) {
-    // Update the SPC700
-    uint8_t opcode = spc700_.read(spc700_.PC);
-    spc700_.ExecuteInstructions(opcode);
-    spc700_.PC++;
-  }
-}
-
 void Apu::RunCycles(uint64_t cycles) {
   uint64_t sync_to =
       (uint64_t)cycles *

src/app/emu/audio/apu.h

@@ -60,7 +60,6 @@ class Apu {
 
   void Init();
   void Reset();
-  void Update();
 
   void RunCycles(uint64_t cycles);
   uint8_t SpcRead(uint16_t address);
@@ -80,13 +79,13 @@ class Apu {
   // Port buffers (equivalent to $2140 to $2143 for the main CPU)
   uint8_t in_ports_[6];  // includes 2 bytes of ram
   uint8_t out_ports_[4];
+  std::vector<uint8_t> ram = std::vector<uint8_t>(0x10000, 0);
 
  private:
   Timer timer_[3];
   uint32_t cycles_;
   uint8_t dsp_adr_;
   bool rom_readable_ = false;
-  std::vector<uint8_t> ram = std::vector<uint8_t>(0x10000, 0);
 
   // Member variables to store internal APU state and resources
   Clock &clock_;