private void RunCpuOne()
{
cpu_stepcounter++;
if (cpu_stepcounter == cpu_sequence[cpu_step])
{
cpu_step++;
cpu_step &= 31;
cpu_stepcounter = 0;
if (sprdma_countdown > 0)
{
sprdma_countdown--;
if (sprdma_countdown == 0)
{
//its weird that this is 514.. normally itd be 512 (and people would say its wrong) or 513 (and people would say its right)
//but 514 passes test 4-irq_and_dma
cpu_deadcounter += 514;
}
}
if (cpu_deadcounter > 0)
{
cpu_deadcounter--;
}
else
{
cpu.IRQ = _irq_apu || board.IRQSignal;
cpu.ExecuteOne();
}
apu.RunOne();
board.ClockCPU();
ppu.PostCpuInstructionOne();
}
}
internal void RunCpuOne()
{
cpu_stepcounter++;
if (cpu_stepcounter == cpu_sequence[cpu_step])
{
cpu_step++;
if (cpu_step == 5)
{
cpu_step = 0;
}
cpu_stepcounter = 0;
if (sprdma_countdown > 0)
{
sprdma_countdown--;
if (sprdma_countdown == 0)
{
//its weird that this is 514.. normally itd be 512 (and people would say its wrong) or 513 (and people would say its right)
//but 514 passes test 4-irq_and_dma
// according to nesdev wiki, http://wiki.nesdev.com/w/index.php/PPU_OAM this is 513 on even cycles and 514 on odd cycles
// TODO: Implement that
cpu_deadcounter += 514;
}
}
if (apu.dmc_dma_countdown > 0)
{
cpu.RDY = false;
apu.dmc_dma_countdown--;
if (apu.dmc_dma_countdown == 0)
{
apu.RunDMCFetch();
cpu.RDY = true;
}
if (apu.dmc_dma_countdown == 0)
{
apu.dmc_dma_countdown = -1;
}
}
if (cpu_deadcounter > 0)
{
cpu_deadcounter--;
}
else
{
cpu.IRQ = _irq_apu || Board.IRQSignal;
cpu.ExecuteOne();
}
ppu.ppu_open_bus_decay(0);
apu.RunOne();
Board.ClockCPU();
ppu.PostCpuInstructionOne();
}
}
internal void RunCpuOne()
{
cpu_stepcounter++;
if (cpu_stepcounter == cpu_sequence[cpu_step])
{
cpu_step++;
if (cpu_step == 5)
{
cpu_step = 0;
}
cpu_stepcounter = 0;
///////////////////////////
// OAM DMA start
///////////////////////////
if (sprdma_countdown > 0)
{
sprdma_countdown--;
if (sprdma_countdown == 0)
{
if (cpu.TotalExecutedCycles % 2 == 0)
{
cpu_deadcounter = 2;
}
else
{
cpu_deadcounter = 1;
}
oam_dma_exec = true;
cpu.RDY = false;
oam_dma_index = 0;
special_case_delay = true;
}
}
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--;
}
}
else if (apu.dmc_dma_countdown == 1)
{
dmc_realign = true;
}
else if (dmc_realign)
{
dmc_realign = false;
}
/////////////////////////////
// OAM DMA end
/////////////////////////////
/////////////////////////////
// dmc dma start
/////////////////////////////
if (apu.dmc_dma_countdown > 0)
{
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.RunOne(true);
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();
apu.RunOne(false);
if (ppu.double_2007_read > 0)
{
ppu.double_2007_read--;
}
if (do_the_reread && cpu.RDY)
{
do_the_reread = false;
}
if (IRQ_delay)
{
IRQ_delay = false;
}
if (!dmc_dma_exec && !oam_dma_exec && !cpu.RDY)
{
cpu.RDY = true;
IRQ_delay = true;
}
ppu.ppu_open_bus_decay(0);
Board.ClockCPU();
ppu.PostCpuInstructionOne();
}
}