public byte ReadReg(int addr)
{
switch (addr)
{
case 0x4000:
case 0x4001:
case 0x4002:
case 0x4003:
case 0x4004:
case 0x4005:
case 0x4006:
case 0x4007:
case 0x4008:
case 0x4009:
case 0x400A:
case 0x400B:
case 0x400C:
case 0x400D:
case 0x400E:
case 0x400F:
case 0x4010:
case 0x4011:
case 0x4012:
case 0x4013:
return(apu.ReadReg(addr));
case 0x4014: /*OAM DMA*/ break;
case 0x4015: return(apu.ReadReg(addr));
case 0x4016:
case 0x4017:
return(read_joyport(addr));
default:
//Console.WriteLine("read register: {0:x4}", addr);
break;
}
return(0xFF);
}
public byte ReadReg(int addr)
{
byte ret_spec;
switch (addr)
{
case 0x4000:
case 0x4001:
case 0x4002:
case 0x4003:
case 0x4004:
case 0x4005:
case 0x4006:
case 0x4007:
case 0x4008:
case 0x4009:
case 0x400A:
case 0x400B:
case 0x400C:
case 0x400D:
case 0x400E:
case 0x400F:
case 0x4010:
case 0x4011:
case 0x4012:
case 0x4013:
return(DB);
//return apu.ReadReg(addr);
case 0x4014: /*OAM DMA*/ break;
case 0x4015: return((byte)((byte)(apu.ReadReg(addr) & 0xDF) + (byte)(DB & 0x20)));
case 0x4016:
if (_isVS)
{
byte ret = 0;
ret = read_joyport(0x4016);
ret &= 1;
ret = (byte)(ret | (VS_service << 2) | (VS_dips[0] << 3) | (VS_dips[1] << 4) | (VS_coin_inserted << 5) | (VS_ROM_control << 7));
return(ret);
}
else
{
// special hardware glitch case
ret_spec = read_joyport(addr);
if (do_the_reread && ppu.region == PPU.Region.NTSC)
{
ret_spec = read_joyport(addr);
do_the_reread = false;
}
return(ret_spec);
}
case 0x4017:
if (_isVS)
{
byte ret = 0;
ret = read_joyport(0x4017);
ret &= 1;
ret = (byte)(ret | (VS_dips[2] << 2) | (VS_dips[3] << 3) | (VS_dips[4] << 4) | (VS_dips[5] << 5) | (VS_dips[6] << 6) | (VS_dips[7] << 7));
return(ret);
}
else
{
// special hardware glitch case
ret_spec = read_joyport(addr);
if (do_the_reread && ppu.region == PPU.Region.NTSC)
{
ret_spec = read_joyport(addr);
do_the_reread = false;
}
return(ret_spec);
}
default:
//Console.WriteLine("read register: {0:x4}", addr);
break;
}
return(DB);
}
public byte ReadReg(int addr)
{
byte ret_spec;
switch (addr)
{
case 0x4000:
case 0x4001:
case 0x4002:
case 0x4003:
case 0x4004:
case 0x4005:
case 0x4006:
case 0x4007:
case 0x4008:
case 0x4009:
case 0x400A:
case 0x400B:
case 0x400C:
case 0x400D:
case 0x400E:
case 0x400F:
case 0x4010:
case 0x4011:
case 0x4012:
case 0x4013:
return(DB);
//return apu.ReadReg(addr);
case 0x4014: /*OAM DMA*/ break;
case 0x4015: return((byte)((byte)(apu.ReadReg(addr) & 0xDF) + (byte)(DB & 0x20)));
case 0x4016:
if (_isVS)
{
byte ret = 0;
ret = read_joyport(0x4016);
ret &= 1;
ret = (byte)(ret | (VS_service << 2) | (VS_dips[0] << 3) | (VS_dips[1] << 4) | (VS_coin_inserted << 5) | (VS_ROM_control << 7));
return(ret);
}
else
{
// special hardware glitch case
ret_spec = read_joyport(addr);
//if (reread_trigger && (do_the_reread_cont_1 == 0)) { Console.WriteLine("same 1 " + (apu.dmc.sample_address - 1)); }
if ((do_the_reread_cont_1 > 0) && ppu.region == PPU.Region.NTSC)
{
ret_spec = read_joyport(addr);
do_the_reread_cont_1--;
if (do_the_reread_cont_1 > 0)
{
ret_spec = read_joyport(addr);
}
//Console.WriteLine("DMC glitch player 1 " + cpu.TotalExecutedCycles + " addr " + (apu.dmc.sample_address - 1));
}
return(ret_spec);
}
case 0x4017:
if (_isVS)
{
byte ret = 0;
ret = read_joyport(0x4017);
ret &= 1;
ret = (byte)(ret | (VS_dips[2] << 2) | (VS_dips[3] << 3) | (VS_dips[4] << 4) | (VS_dips[5] << 5) | (VS_dips[6] << 6) | (VS_dips[7] << 7));
return(ret);
}
else
{
// special hardware glitch case
ret_spec = read_joyport(addr);
//if (reread_trigger && (do_the_reread_cont_2 == 0)) { Console.WriteLine("same 2 " + (apu.dmc.sample_address - 1)); }
if ((do_the_reread_cont_2 > 0) && ppu.region == PPU.Region.NTSC)
{
ret_spec = read_joyport(addr);
do_the_reread_cont_2--;
if (do_the_reread_cont_2 > 0)
{
ret_spec = read_joyport(addr);
}
//Console.WriteLine("DMC glitch player 2 " + cpu.TotalExecutedCycles + " addr " + (apu.dmc.sample_address - 1));
}
return(ret_spec);
}
default:
//Console.WriteLine("read register: {0:x4}", addr);
break;
}
return(DB);
}
public byte ReadReg(int addr)
{
byte ret_spec;
switch (addr)
{
case 0x4000:
case 0x4001:
case 0x4002:
case 0x4003:
case 0x4004:
case 0x4005:
case 0x4006:
case 0x4007:
case 0x4008:
case 0x4009:
case 0x400A:
case 0x400B:
case 0x400C:
case 0x400D:
case 0x400E:
case 0x400F:
case 0x4010:
case 0x4011:
case 0x4012:
case 0x4013:
return(DB);
//return apu.ReadReg(addr);
case 0x4014: /*OAM DMA*/ break;
case 0x4015: return((byte)((byte)(apu.ReadReg(addr) & 0xDF) + (byte)(DB & 0x20)));
case 0x4016:
{
// special hardware glitch case
ret_spec = read_joyport(addr);
if (do_the_reread)
{
ret_spec = read_joyport(addr);
do_the_reread = false;
}
return(ret_spec);
}
case 0x4017:
{
if (_iskeyboard)
{
// eventually this will be the keyboard function, but for now it is a place holder (no keys pressed)
return(0x1E);
}
else
{
return(read_joyport(addr));
}
}
default:
//Console.WriteLine("read register: {0:x4}", addr);
break;
}
return(DB);
}