public byte DB; //old data bus values from previous reads
internal void RunCpuOne()
{
///////////////////////////
// OAM DMA start
///////////////////////////
if (oam_dma_exec && apu.dmc_dma_countdown != 1 && !dmc_realign)
{
if (cpu_deadcounter == 0)
{
if (oam_dma_index % 2 == 0)
{
oam_dma_byte = ReadMemory(oam_dma_addr);
oam_dma_addr++;
}
else
{
WriteMemory(0x2004, oam_dma_byte);
}
oam_dma_index++;
if (oam_dma_index == 512)
{
oam_dma_exec = false;
}
}
else
{
cpu_deadcounter--;
}
}
dmc_realign = false;
/////////////////////////////
// OAM DMA end
/////////////////////////////
/////////////////////////////
// dmc dma start
/////////////////////////////
if (apu.dmc_dma_countdown > 0)
{
if (apu.dmc_dma_countdown == 1)
{
dmc_realign = true;
}
cpu.RDY = false;
dmc_dma_exec = true;
apu.dmc_dma_countdown--;
if (apu.dmc_dma_countdown == 0)
{
apu.RunDMCFetch();
dmc_dma_exec = false;
apu.dmc_dma_countdown = -1;
do_the_reread = true;
}
}
/////////////////////////////
// dmc dma end
/////////////////////////////
apu.RunOneFirst();
if (cpu.RDY && !IRQ_delay)
{
cpu.IRQ = _irq_apu || Board.IrqSignal;
}
else if (special_case_delay || apu.dmc_dma_countdown == 3)
{
cpu.IRQ = _irq_apu || Board.IrqSignal;
special_case_delay = false;
}
cpu.ExecuteOne();
Board.ClockCpu();
int s = apu.EmitSample();
if (s != old_s)
{
blip.AddDelta(apu.sampleclock, s - old_s);
old_s = s;
}
apu.sampleclock++;
apu.RunOneLast();
if (do_the_reread && cpu.RDY)
{
do_the_reread = false;
}
IRQ_delay = false;
if (!dmc_dma_exec && !oam_dma_exec && !cpu.RDY)
{
cpu.RDY = true;
IRQ_delay = true;
}
}
public byte DB; //old data bus values from previous reads
internal void RunCpuOne()
{
///////////////////////////
// OAM DMA start
///////////////////////////
if (oam_dma_exec && apu.dmc_dma_countdown != 1 && !dmc_realign)
{
if (cpu_deadcounter == 0)
{
if (oam_dma_index % 2 == 0)
{
oam_dma_byte = ReadMemory(oam_dma_addr);
oam_dma_addr++;
}
else
{
WriteMemory(0x2004, oam_dma_byte);
}
oam_dma_index++;
if (oam_dma_index == 512)
{
oam_dma_exec = false;
}
}
else
{
cpu_deadcounter--;
}
}
dmc_realign = false;
/////////////////////////////
// OAM DMA end
/////////////////////////////
/////////////////////////////
// dmc dma start
/////////////////////////////
if (apu.dmc_dma_countdown > 0)
{
if (apu.dmc_dma_countdown == 1)
{
dmc_realign = true;
}
// By this point the cpu should be frozen, if it is not, then we are in a multi-write opcode, add another cycle delay
if (!cpu.RDY && !cpu.rdy_freeze && (apu.dmc_dma_countdown == apu.DMC_RDY_check))
{
//Console.WriteLine("dmc RDY false " + cpu.TotalExecutedCycles + " " + apu.call_from_write + " " + cpu.opcode + " " + oam_dma_exec);
apu.dmc_dma_countdown += 2;
apu.DMC_RDY_check = -1;
}
cpu.RDY = false;
dmc_dma_exec = true;
apu.dmc_dma_countdown--;
if (apu.dmc_dma_countdown == 0)
{
apu.RunDMCFetch();
dmc_dma_exec = false;
apu.dmc_dma_countdown = -1;
do_the_reread = true;
}
//Console.WriteLine("dmc RDY false " + cpu.TotalExecutedCycles + " " + apu.call_from_write + " " + cpu.opcode);
}
/////////////////////////////
// dmc dma end
/////////////////////////////
apu.RunOneFirst();
if (cpu.RDY && !IRQ_delay)
{
cpu.IRQ = _irq_apu || Board.IrqSignal;
}
else if (special_case_delay || apu.dmc_dma_countdown == 3)
{
cpu.IRQ = _irq_apu || Board.IrqSignal;
special_case_delay = false;
}
cpu.ExecuteOne();
Board.ClockCpu();
int s = apu.EmitSample();
if (s != old_s)
{
blip.AddDelta(apu.sampleclock, s - old_s);
old_s = s;
}
apu.sampleclock++;
apu.RunOneLast();
if (do_the_reread && cpu.RDY)
{
do_the_reread = false;
}
IRQ_delay = false;
if (!dmc_dma_exec && !oam_dma_exec && !cpu.RDY)
{
cpu.RDY = true;
IRQ_delay = true;
}
}
public byte DB; //old data bus values from previous reads
internal void RunCpuOne()
{
///////////////////////////
// OAM DMA start
///////////////////////////
if (oam_dma_exec && apu.dmc_dma_countdown != 1 && !dmc_realign)
{
if (cpu_deadcounter == 0)
{
if (oam_dma_index % 2 == 0)
{
oam_dma_byte = ReadMemory(oam_dma_addr);
oam_dma_addr++;
}
else
{
WriteMemory(0x2004, oam_dma_byte);
}
oam_dma_index++;
if (oam_dma_index == 512)
{
oam_dma_exec = false;
}
}
else
{
cpu_deadcounter--;
}
}
dmc_realign = false;
/////////////////////////////
// OAM DMA end
/////////////////////////////
/////////////////////////////
// dmc dma start
/////////////////////////////
if (apu.dmc_dma_countdown > 0)
{
if (apu.dmc_dma_countdown == 1 && !apu.dmc.fill_glitch)
{
dmc_realign = true;
}
// By this point the cpu should be frozen, if it is not, then we are in a multi-write opcode, add another cycle delay
if (!cpu.RDY && !cpu.rdy_freeze && (apu.dmc_dma_countdown == apu.DMC_RDY_check))
{
//Console.WriteLine("dmc double " + cpu.TotalExecutedCycles + " " + cpu.opcode + " " + cpu.mi);
apu.dmc_dma_countdown += 2;
apu.DMC_RDY_check = -1;
}
cpu.RDY = false;
dmc_dma_exec = true;
apu.dmc_dma_countdown--;
if (apu.dmc_dma_countdown == 0)
{
if (!apu.dmc.fill_glitch)
{
reread_trigger = true;
// if the DMA address has the same bits set as the re-read address, they don't occur
if ((apu.dmc.sample_address & 0x2007) != 0x2002)
{
do_the_reread_2002++;
}
if ((apu.dmc.sample_address & 0x2007) != 0x2007)
{
do_the_reread_2007++;
}
if ((apu.dmc.sample_address & 0x401F) != 0x4016)
{
do_the_reread_cont_1++;
}
if ((apu.dmc.sample_address & 0x401F) != 0x4017)
{
do_the_reread_cont_2++;
}
apu.RunDMCFetch();
}
dmc_dma_exec = false;
apu.dmc_dma_countdown = -1;
apu.dmc.fill_glitch = false;
/*
* //if (apu.dmc.timer == (apu.dmc.timer_reload-0) && apu.dmc.out_bits_remaining == 7)
* //if (apu.dmc.timer == 2 && apu.dmc.out_bits_remaining == 0)
* {
* Console.WriteLine("close " + cpu.TotalExecutedCycles + " " + apu.dmc.timer + " " + apu.dmc.sample_length);
* apu.dmc.fill_glitch = true;
* apu.dmc.delay = 3;
* }
*/
//Console.WriteLine("dmc RDY false " + cpu.TotalExecutedCycles + " " + cpu.opcode + " " + cpu.mi + " " + apu.dmc.timer);
}
}
/////////////////////////////
// dmc dma end
/////////////////////////////
apu.RunOneFirst();
if (cpu.RDY && !IRQ_delay)
{
cpu.IRQ = _irq_apu || Board.IrqSignal;
}
else if (special_case_delay || apu.dmc_dma_countdown == 3)
{
cpu.IRQ = _irq_apu || Board.IrqSignal;
//if (cpu.IRQ) { Console.WriteLine("something IRQ"); }
special_case_delay = false;
}
cpu.ExecuteOne();
Board.ClockCpu();
int s = apu.EmitSample();
if (s != old_s)
{
blip.AddDelta(apu.sampleclock, s - old_s);
old_s = s;
}
apu.sampleclock++;
apu.RunOneLast();
if (reread_trigger && cpu.RDY)
{
do_the_reread_2002 = 0;
do_the_reread_2007 = 0;
do_the_reread_cont_1 = 0;
do_the_reread_cont_2 = 0;
reread_trigger = false;
}
IRQ_delay = false;
if (!dmc_dma_exec && !oam_dma_exec && !cpu.RDY)
{
cpu.RDY = true;
IRQ_delay = true;
}
}