public override void AtVsyncNMI()
{
if (Patch_Vectors)
{
NES.cpu.NMI = true;
}
//strobe pad
NES.WriteMemory(0x4016, 1);
NES.WriteMemory(0x4016, 0);
//read pad and create rising edge button signals so we dont trigger events as quickly as we hold the button down
int currButtons = 0;
for (int i = 0; i < 8; i++)
{
currButtons <<= 1;
currButtons |= (NES.ReadMemory(0x4016) & 1);
}
int justDown = (~ButtonState) & currButtons;
Bit a = (justDown >> 7) & 1;
Bit b = (justDown >> 6) & 1;
Bit sel = (justDown >> 5) & 1;
Bit start = (justDown >> 4) & 1;
Bit up = (justDown >> 3) & 1;
Bit down = (justDown >> 2) & 1;
Bit left = (justDown >> 1) & 1;
Bit right = (justDown >> 0) & 1;
ButtonState = currButtons;
//RIGHT: next song
//LEFT: prev song
//A: restart song
bool reset = false;
if (right)
{
CurrentSong++;
reset = true;
}
if (left)
{
CurrentSong--;
reset = true;
}
if (a)
{
reset = true;
}
if (reset)
{
ReplayInit();
}
}
public override byte ReadReg2xxx(int addr)
{
if (addr < 0x3800)
{
return(base.ReadReg2xxx(addr));
}
else if (addr >= 0x3FF0)
{
switch (addr)
{
case 0x3FF0:
{
byte ret = 0;
if (InitPending)
{
ret = 1;
}
InitPending = false;
return(ret);
}
case 0x3FF1:
{
//kevtris's reset process seems not to work. dunno what all is going on in there
//our own innovation, should work OK..
NES.apu.NESSoftReset();
//mostly fceux's guidance
NES.WriteMemory(0x4015, 0);
for (int i = 0; i < 14; i++)
{
NES.WriteMemory((ushort)(0x4000 + i), 0);
}
NES.WriteMemory(0x4015, 0x0F);
//clearing APU misc stuff, maybe not needed with soft reset above
//NES.WriteMemory(0x4017, 0xC0);
//NES.WriteMemory(0x4017, 0xC0);
//NES.WriteMemory(0x4017, 0x40);
//important to NSF standard for ram to be cleared, otherwise replayers are confused on account of not initializing memory themselves
var ram = NES.ram;
var wram = this.WRAM;
int wram_size = wram.Length;
for (int i = 0; i < 0x800; i++)
{
ram[i] = 0;
}
for (int i = 0; i < wram_size; i++)
{
wram[i] = 0;
}
//store specified initial bank state
if (BankSwitched)
{
for (int i = 0; i < 8; i++)
{
WriteEXP(0x5FF8 + i - 0x4000, InitBankSwitches[i]);
}
}
return((byte)(CurrentSong - 1));
}
case 0x3FF2:
return(0); //always return NTSC for now
case 0x3FF3:
Patch_Vectors = false;
return(0);
case 0x3FF4:
Patch_Vectors = true;
return(0);
default:
return(base.ReadReg2xxx(addr));
}
}
else if (addr - 0x3800 < NSFROM.Length)
{
return(NSFROM[addr - 0x3800]);
}
else
{
return(base.ReadReg2xxx(addr));
}
}
public override void AtVsyncNmi()
{
if (Patch_Vectors)
{
NES.cpu.NMI = true;
}
//strobe pad
NES.WriteMemory(0x4016, 1);
NES.WriteMemory(0x4016, 0);
//read pad and create rising edge button signals so we don't trigger events as quickly as we hold the button down
int currButtons = 0;
for (int i = 0; i < 8; i++)
{
currButtons <<= 1;
currButtons |= (NES.ReadMemory(0x4016) & 1);
}
int justDown = (~ButtonState) & currButtons;
Bit a = (justDown >> 7) & 1;
Bit b = (justDown >> 6) & 1;
Bit sel = (justDown >> 5) & 1;
Bit start = (justDown >> 4) & 1;
Bit up = (justDown >> 3) & 1;
Bit down = (justDown >> 2) & 1;
Bit left = (justDown >> 1) & 1;
Bit right = (justDown >> 0) & 1;
ButtonState = currButtons;
//RIGHT: next song
//LEFT: prev song
//A: restart song
//RTC_Hijack :: control NSF from System Bus 0x00CE
ushort songChangeAdress = 0x00CE; //RTC_Hijack
byte songValue = NES.ReadMemory(songChangeAdress); //RTC_Hijack
bool reset = false;
if (right || (songValue == 0xFB)) //RTC_Hijack
{
NES.WriteMemory(songChangeAdress, 0xFF); //RTC_Hijack
if (CurrentSong < nsf.TotalSongs - 1)
{
CurrentSong++;
reset = true;
}
}
if (left || (songValue == 0xFA)) //RTC_Hijack
{
NES.WriteMemory(songChangeAdress, 0xFF); //RTC_Hijack
if (CurrentSong > 0)
{
CurrentSong--;
reset = true;
}
}
if (a)
{
reset = true;
}
if (reset)
{
ReplayInit();
}
}
public void WriteMemory(ushort address, byte value) => _nes.WriteMemory(address, value);