cleanup apu and spc

src/app/emu/audio/apu.cc

@@ -29,8 +29,6 @@ static const uint8_t bootRom[0x40] = {
     0xdd, 0x5d, 0xd0, 0xdb, 0x1f, 0x00, 0x00, 0xc0, 0xff};
 
 void Apu::Init() {
-  // Set the clock frequency
-  clock_.SetFrequency(kApuClockSpeed);
   ram.resize(0x10000);
   for (int i = 0; i < 0x10000; i++) {
     ram[i] = 0;

src/app/emu/audio/apu.h

@@ -17,10 +17,6 @@ namespace audio {
 
 using namespace memory;
 
-const int kApuClockSpeed = 1024000;  // 1.024 MHz
-const int apuSampleRate = 32000;     // 32 KHz
-const int apuClocksPerSample = 64;   // 64 clocks per sample
-
 typedef struct Timer {
   uint8_t cycles;
   uint8_t divider;

src/app/emu/audio/internal/addressing.cc

@@ -85,12 +85,6 @@ uint8_t Spc700::dp() {
   return ReadOpcode() | (PSW.P << 8);
 }
 
-uint8_t Spc700::get_dp_addr() {
-  PC++;
-  uint8_t offset = read(PC);
-  return (PSW.P << 8) + offset;
-}
-
 // Direct page indexed by X
 uint8_t Spc700::dp_plus_x() {
   PC++;

src/app/emu/audio/spc700.cc

@@ -854,7 +854,6 @@ void Spc700::ExecuteInstructions(uint8_t opcode) {
       A = (A >> 4) | (A << 4);
       PSW.Z = (A == 0);
       PSW.N = (A & 0x80);
-      ;
       break;
     }
     case 0xa0: {  // ei  imp