[picodrive.git] / Pico / cd / Pico.c

// This is part of Pico Library

// (c) Copyright 2004 Dave, All rights reserved.
// (c) Copyright 2007 notaz, All rights reserved.
// Free for non-commercial use.

// For commercial use, separate licencing terms must be obtained.


#include "../PicoInt.h"
#include "../sound/sound.h"


extern unsigned char formatted_bram[4*0x10];
extern unsigned int s68k_poll_adclk;

void (*PicoMCDopenTray)(void) = NULL;
int  (*PicoMCDcloseTray)(void) = NULL;

#define dump_ram(ram,fname) \
{ \
  int i, d; \
  FILE *f; \
\
  for (i = 0; i < sizeof(ram); i+=2) { \
    d = (ram[i]<<8) | ram[i+1]; \
    *(unsigned short *)(ram+i) = d; \
  } \
  f = fopen(fname, "wb"); \
  if (f) { \
    fwrite(ram, 1, sizeof(ram), f); \
    fclose(f); \
  } \
  for (i = 0; i < sizeof(ram); i+=2) { \
    d = (ram[i]<<8) | ram[i+1]; \
    *(unsigned short *)(ram+i) = d; \
  } \
}


int PicoInitMCD(void)
{
  SekInitS68k();
  Init_CD_Driver();

  return 0;
}


void PicoExitMCD(void)
{
  End_CD_Driver();

  //dump_ram(Pico_mcd->prg_ram, "prg.bin");
  //dump_ram(Pico.ram, "ram.bin");
}

int PicoResetMCD(int hard)
{
  if (hard) {
    int fmt_size = sizeof(formatted_bram);
    memset(Pico_mcd->prg_ram,    0, sizeof(Pico_mcd->prg_ram));
    memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M));
    memset(Pico_mcd->pcm_ram,    0, sizeof(Pico_mcd->pcm_ram));
    memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
    memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size);
  }
  memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
  memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
  memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));

  *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
  Pico_mcd->m.state_flags |= 1; // s68k reset pending
  Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset

  Reset_CD();
  LC89510_Reset();
  gfx_cd_reset();
#ifdef _ASM_CD_MEMORY_C
  PicoMemResetCD(1);
  //PicoMemResetCDdecode(1); // don't have to call this in 2M mode
#endif

  return 0;
}

static __inline void SekRun(int cyc)
{
  int cyc_do;
  SekCycleAim+=cyc;
  if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
#if defined(EMU_C68K)
  PicoCpu.cycles=cyc_do;
  CycloneRun(&PicoCpu);
  SekCycleCnt+=cyc_do-PicoCpu.cycles;
#elif defined(EMU_M68K)
  m68k_set_context(&PicoM68kCPU);
  SekCycleCnt+=m68k_execute(cyc_do);
#endif
}

static __inline void SekRunS68k(int cyc)
{
  int cyc_do;
  SekCycleAimS68k+=cyc;
  if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
#if defined(EMU_C68K)
  PicoCpuS68k.cycles=cyc_do;
  CycloneRun(&PicoCpuS68k);
  SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
#elif defined(EMU_M68K)
  m68k_set_context(&PicoS68kCPU);
  SekCycleCntS68k+=m68k_execute(cyc_do);
#endif
}

#define PS_STEP_M68K ((488<<16)/20) // ~24
//#define PS_STEP_S68K 13

#ifdef _ASM_CD_PICO_C
void SekRunPS(int cyc_m68k, int cyc_s68k);
#else
static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
{
  int cycn, cycn_s68k, cyc_do;
  int d_cm = 0, d_cs = 0, ex;
  SekCycleAim+=cyc_m68k;
  SekCycleAimS68k+=cyc_s68k;

//  fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k,
//  		SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline);

  /* loop 488 downto 0 in steps of PS_STEP */
  for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K)
  {
    ex = 0;
    cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
//fprintf(stderr, "%3i/%3i:  ", cycn>>16, cycn_s68k);
    if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
#if defined(EMU_C68K)
      PicoCpu.cycles = cyc_do;
      CycloneRun(&PicoCpu);
      SekCycleCnt += cyc_do - PicoCpu.cycles;
#elif defined(EMU_M68K)
      m68k_set_context(&PicoM68kCPU);
      SekCycleCnt += (ex = m68k_execute(cyc_do));
#endif
    }
//fprintf(stderr, "%3i ", ex); d_cm += ex; ex = 0;
    if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
#if defined(EMU_C68K)
      PicoCpuS68k.cycles = cyc_do;
      CycloneRun(&PicoCpuS68k);
      SekCycleCntS68k += cyc_do - PicoCpuS68k.cycles;
#elif defined(EMU_M68K)
      m68k_set_context(&PicoS68kCPU);
      SekCycleCntS68k += (ex = m68k_execute(cyc_do));
#endif
    }
//fprintf(stderr, "%3i\n", ex); d_cs += ex;
  }

//fprintf(stderr, "==    end %3i/%3i    ==\n", d_cm, d_cs);
}
#endif


static __inline void check_cd_dma(void)
{
	int ddx;

	if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;

	ddx = Pico_mcd->s68k_regs[4] & 7;
	if (ddx <  2) return; // invalid
	if (ddx <  4) {
		Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
		return;
	}
	if (ddx == 6) return; // invalid

	Update_CDC_TRansfer(ddx); // now go and do the actual transfer
}

static __inline void update_chips(void)
{
	int counter_timer, int3_set;
	int counter75hz_lim = Pico.m.pal ? 2080 : 2096;

	// 75Hz CDC update
	if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
		Pico_mcd->m.counter75hz -= counter75hz_lim;
		Check_CD_Command();
	}

	// update timers
	counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
	Pico_mcd->m.timer_stopwatch += counter_timer;
	if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
		Pico_mcd->m.timer_int3 -= counter_timer;
		if (Pico_mcd->m.timer_int3 < 0) {
			if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
				dprintf("s68k: timer irq 3");
				SekInterruptS68k(3);
				Pico_mcd->m.timer_int3 += int3_set << 16;
			}
			// is this really what happens if irq3 is masked out?
			Pico_mcd->m.timer_int3 &= 0xffffff;
		}
	}

	// update gfx chip
	if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
		gfx_cd_update();

	// delayed setting of DMNA bit (needed for Silpheed)
	if (Pico_mcd->m.state_flags & 2) {
		Pico_mcd->m.state_flags &= ~2;
		if (!(Pico_mcd->s68k_regs[3] & 4)) {
			Pico_mcd->s68k_regs[3] |=  2;
			Pico_mcd->s68k_regs[3] &= ~1;
#ifdef USE_POLL_DETECT
			if ((s68k_poll_adclk&0xfe) == 2) {
				SekSetStopS68k(0); s68k_poll_adclk = 0;
			}
#endif
		}
	}
}


static int PicoFrameHintsMCD(void)
{
  struct PicoVideo *pv=&Pico.video;
  int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
  const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
  int skip=PicoSkipFrame || (PicoOpt&0x10);
  int hint; // Hint counter

  if(Pico.m.pal) { //
    //cycles_68k = (int) ((double) OSC_PAL  /  7 / 50 / 312 + 0.4); // should compile to a constant (488)
    //cycles_z80 = (int) ((double) OSC_PAL  / 15 / 50 / 312 + 0.4); // 228
    lines  = 312;    // Steve Snake says there are 313 lines, but this seems to also work well
    line_sample = 68;
    if(pv->reg[1]&8) lines_vis = 240;
  } else {
    //cycles_68k = (int) ((double) OSC_NTSC /  7 / 60 / 262 + 0.4); // 488
    //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
    lines  = 262;
    line_sample = 93;
  }

  SekCyclesReset();
  SekCyclesResetS68k();
  //z80ExtraCycles = 0;

  if(PicoOpt&4)
    z80CycleAim = 0;
//    z80_resetCycles();

  pv->status&=~0x88; // clear V-Int, come out of vblank

  hint=pv->reg[10]; // Load H-Int counter
  //dprintf("-hint: %i", hint);

  for (y=0;y<lines;y++)
  {
    Pico.m.scanline=(short)y;

    // pad delay (for 6 button pads)
    if(PicoOpt&0x20) {
      if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
      if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
    }

    check_cd_dma();

    // H-Interrupts:
    if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
    {
      //dprintf("rhint:old @ %06x", SekPc);
      hint=pv->reg[10]; // Reload H-Int counter
      pv->pending_ints|=0x10;
      if (pv->reg[0]&0x10) SekInterrupt(4);
      //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);
      //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));
    }

    // V-Interrupt:
    if (y == lines_vis)
    {
      //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
      pv->status|=0x88; // V-Int happened, go into vblank
      SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
      /*if(Pico.m.z80Run && (PicoOpt&4)) {
        z80CycleAim+=cycles_z80/2;
        total_z80+=z80_run(z80CycleAim-total_z80);
        z80CycleAim-=cycles_z80/2;
      }*/
      pv->pending_ints|=0x20;
      if(pv->reg[1]&0x20) SekInterrupt(6);
      if(Pico.m.z80Run && (PicoOpt&4)) // ?
        z80_int();
      //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
    }

    // decide if we draw this line
#if CAN_HANDLE_240_LINES
    if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )
#else
    if(!skip && y<224)
#endif
      PicoLine(y);

    if(PicoOpt&1)
      sound_timers_and_dac(y);

    // get samples from sound chips
    if (y == 224 && PsndOut) {
      int len = sound_render(0, PsndLen);
      if (PicoWriteSound) PicoWriteSound(len);
      // clear sound buffer
      sound_clear();
    }

    // Run scanline:
      //dprintf("m68k starting exec @ %06x", SekPc);
    if (Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
    if ((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) {
      SekRunPS(cycles_68k, cycles_s68k); // "better/perfect sync"
    } else {
      SekRun(cycles_68k);
      if ((Pico_mcd->m.busreq&3) == 1) // no busreq/no reset
        SekRunS68k(cycles_s68k);
    }

    if ((PicoOpt&4) && Pico.m.z80Run) {
      if (Pico.m.z80Run & 2) z80CycleAim+=cycles_z80;
      else {
        int cnt = SekCyclesDone() - z80startCycle;
        cnt = (cnt>>1)-(cnt>>5);
        //if (cnt > cycles_z80) printf("FIXME: z80 cycles: %i\n", cnt);
        if (cnt > cycles_z80) cnt = cycles_z80;
        Pico.m.z80Run |= 2;
        z80CycleAim+=cnt;
      }
      total_z80+=z80_run(z80CycleAim-total_z80);
    }

    update_chips();
  }

  // draw a frame just after vblank in alternative render mode
  if (!PicoSkipFrame && (PicoOpt&0x10))
    PicoFrameFull();

  return 0;
}


int PicoFrameMCD(void)
{
  if(!(PicoOpt&0x10))
    PicoFrameStart();

  PicoFrameHintsMCD();

  return 0;
}
Commit	Line	Data
cc68a136	1	// This is part of Pico Library
	2
	3	// (c) Copyright 2004 Dave, All rights reserved.
672ad671	4	// (c) Copyright 2007 notaz, All rights reserved.
cc68a136	5	// Free for non-commercial use.
	6
	7	// For commercial use, separate licencing terms must be obtained.
	8
	9
	10	#include "../PicoInt.h"
	11	#include "../sound/sound.h"
	12
	13
76276b0b	14	extern unsigned char formatted_bram[4*0x10];
89fa852d	15	extern unsigned int s68k_poll_adclk;
89fa852d	16
721cd396	17	void (*PicoMCDopenTray)(void) = NULL;
721cd396	18	int (*PicoMCDcloseTray)(void) = NULL;
89fa852d	19
	20	#define dump_ram(ram,fname) \
	21	{ \
	22	int i, d; \
	23	FILE *f; \
	24	\
	25	for (i = 0; i < sizeof(ram); i+=2) { \
	26	d = (ram[i]<<8) \| ram[i+1]; \
	27	(unsigned short )(ram+i) = d; \
	28	} \
	29	f = fopen(fname, "wb"); \
	30	if (f) { \
	31	fwrite(ram, 1, sizeof(ram), f); \
	32	fclose(f); \
	33	} \
	34	for (i = 0; i < sizeof(ram); i+=2) { \
	35	d = (ram[i]<<8) \| ram[i+1]; \
	36	(unsigned short )(ram+i) = d; \
	37	} \
	38	}
cc68a136	39
	40
	41	int PicoInitMCD(void)
	42	{
	43	SekInitS68k();
	44	Init_CD_Driver();
	45
	46	return 0;
	47	}
	48
	49
	50	void PicoExitMCD(void)
	51	{
	52	End_CD_Driver();
89fa852d	53
	54	//dump_ram(Pico_mcd->prg_ram, "prg.bin");
	55	//dump_ram(Pico.ram, "ram.bin");
cc68a136	56	}
	57
	58	int PicoResetMCD(int hard)
	59	{
51a902ae	60	if (hard) {
a4030801	61	int fmt_size = sizeof(formatted_bram);
	62	memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
	63	memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M));
	64	memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
	65	memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
	66	memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size);
51a902ae	67	}
51a902ae	68	memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
4f265db7	69	memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
5c69a605	70	memset(&Pico_mcd->m, 0, sizeof(Pico_mcd->m));
51a902ae	71
d1df8786	72	(unsigned int )(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
c008977e	73	Pico_mcd->m.state_flags \|= 1; // s68k reset pending
672ad671	74	Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
cc68a136	75
cc68a136	76	Reset_CD();
5c69a605	77	LC89510_Reset();
51a902ae	78	gfx_cd_reset();
4ff2d527	79	#ifdef _ASM_CD_MEMORY_C
4ff2d527	80	PicoMemResetCD(1);
00bd648e	81	//PicoMemResetCDdecode(1); // don't have to call this in 2M mode
4ff2d527	82	#endif
cc68a136	83
	84	return 0;
	85	}
	86
	87	static __inline void SekRun(int cyc)
	88	{
	89	int cyc_do;
	90	SekCycleAim+=cyc;
	91	if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
b837b69b	92	#if defined(EMU_C68K)
	93	PicoCpu.cycles=cyc_do;
	94	CycloneRun(&PicoCpu);
	95	SekCycleCnt+=cyc_do-PicoCpu.cycles;
	96	#elif defined(EMU_M68K)
cc68a136	97	m68k_set_context(&PicoM68kCPU);
	98	SekCycleCnt+=m68k_execute(cyc_do);
	99	#endif
	100	}
	101
	102	static __inline void SekRunS68k(int cyc)
	103	{
	104	int cyc_do;
	105	SekCycleAimS68k+=cyc;
	106	if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
b837b69b	107	#if defined(EMU_C68K)
	108	PicoCpuS68k.cycles=cyc_do;
	109	CycloneRun(&PicoCpuS68k);
	110	SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
	111	#elif defined(EMU_M68K)
cc68a136	112	m68k_set_context(&PicoS68kCPU);
	113	SekCycleCntS68k+=m68k_execute(cyc_do);
	114	#endif
	115	}
	116
7336a99a	117	#define PS_STEP_M68K ((488<<16)/20) // ~24
7336a99a	118	//#define PS_STEP_S68K 13
68cba51e	119
a4030801	120	#ifdef _ASM_CD_PICO_C
	121	void SekRunPS(int cyc_m68k, int cyc_s68k);
	122	#else
68cba51e	123	static __inline void SekRunPS(int cyc_m68k, int cyc_s68k)
68cba51e	124	{
7336a99a	125	int cycn, cycn_s68k, cyc_do;
7336a99a	126	int d_cm = 0, d_cs = 0, ex;
68cba51e	127	SekCycleAim+=cyc_m68k;
68cba51e	128	SekCycleAimS68k+=cyc_s68k;
7336a99a	129
	130	// fprintf(stderr, "=== start %3i/%3i [%3i/%3i] {%05i.%i} ===\n", cyc_m68k, cyc_s68k,
	131	// SekCycleAim-SekCycleCnt, SekCycleAimS68k-SekCycleCntS68k, Pico.m.frame_count, Pico.m.scanline);
	132
	133	/* loop 488 downto 0 in steps of PS_STEP */
	134	for (cycn = (488<<16)-PS_STEP_M68K; cycn >= 0; cycn -= PS_STEP_M68K)
	135	{
	136	ex = 0;
	137	cycn_s68k = (cycn + cycn/2 + cycn/8) >> 16;
	138	//fprintf(stderr, "%3i/%3i: ", cycn>>16, cycn_s68k);
	139	if ((cyc_do = SekCycleAim-SekCycleCnt-(cycn>>16)) > 0) {
68cba51e	140	#if defined(EMU_C68K)
7336a99a	141	PicoCpu.cycles = cyc_do;
68cba51e	142	CycloneRun(&PicoCpu);
7336a99a	143	SekCycleCnt += cyc_do - PicoCpu.cycles;
68cba51e	144	#elif defined(EMU_M68K)
68cba51e	145	m68k_set_context(&PicoM68kCPU);
7336a99a	146	SekCycleCnt += (ex = m68k_execute(cyc_do));
68cba51e	147	#endif
7336a99a	148	}
	149	//fprintf(stderr, "%3i ", ex); d_cm += ex; ex = 0;
	150	if ((cyc_do = SekCycleAimS68k-SekCycleCntS68k-cycn_s68k) > 0) {
68cba51e	151	#if defined(EMU_C68K)
7336a99a	152	PicoCpuS68k.cycles = cyc_do;
68cba51e	153	CycloneRun(&PicoCpuS68k);
7336a99a	154	SekCycleCntS68k += cyc_do - PicoCpuS68k.cycles;
68cba51e	155	#elif defined(EMU_M68K)
68cba51e	156	m68k_set_context(&PicoS68kCPU);
7336a99a	157	SekCycleCntS68k += (ex = m68k_execute(cyc_do));
68cba51e	158	#endif
7336a99a	159	}
7336a99a	160	//fprintf(stderr, "%3i\n", ex); d_cs += ex;
68cba51e	161	}
7336a99a	162
7336a99a	163	//fprintf(stderr, "== end %3i/%3i ==\n", d_cm, d_cs);
68cba51e	164	}
7336a99a	165	#endif
68cba51e	166
68cba51e	167
bf098bc5	168	static __inline void check_cd_dma(void)
	169	{
	170	int ddx;
	171
c459aefd	172	if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
bf098bc5	173
	174	ddx = Pico_mcd->s68k_regs[4] & 7;
	175	if (ddx < 2) return; // invalid
c459aefd	176	if (ddx < 4) {
	177	Pico_mcd->s68k_regs[4] \|= 0x40; // Data set ready in host port
	178	return;
	179	}
bf098bc5	180	if (ddx == 6) return; // invalid
	181
	182	Update_CDC_TRansfer(ddx); // now go and do the actual transfer
	183	}
	184
4f265db7	185	static __inline void update_chips(void)
	186	{
	187	int counter_timer, int3_set;
	188	int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
	189
	190	// 75Hz CDC update
	191	if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
	192	Pico_mcd->m.counter75hz -= counter75hz_lim;
	193	Check_CD_Command();
	194	}
	195
	196	// update timers
	197	counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
	198	Pico_mcd->m.timer_stopwatch += counter_timer;
	199	if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
	200	Pico_mcd->m.timer_int3 -= counter_timer;
	201	if (Pico_mcd->m.timer_int3 < 0) {
	202	if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
	203	dprintf("s68k: timer irq 3");
	204	SekInterruptS68k(3);
	205	Pico_mcd->m.timer_int3 += int3_set << 16;
	206	}
	207	// is this really what happens if irq3 is masked out?
	208	Pico_mcd->m.timer_int3 &= 0xffffff;
	209	}
	210	}
	211
	212	// update gfx chip
	213	if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
	214	gfx_cd_update();
89fa852d	215
	216	// delayed setting of DMNA bit (needed for Silpheed)
	217	if (Pico_mcd->m.state_flags & 2) {
	218	Pico_mcd->m.state_flags &= ~2;
46969540	219	if (!(Pico_mcd->s68k_regs[3] & 4)) {
	220	Pico_mcd->s68k_regs[3] \|= 2;
	221	Pico_mcd->s68k_regs[3] &= ~1;
89fa852d	222	#ifdef USE_POLL_DETECT
46969540	223	if ((s68k_poll_adclk&0xfe) == 2) {
	224	SekSetStopS68k(0); s68k_poll_adclk = 0;
	225	}
89fa852d	226	#endif
46969540	227	}
89fa852d	228	}
4f265db7	229	}
4f265db7	230
b837b69b	231
cc68a136	232	static int PicoFrameHintsMCD(void)
	233	{
	234	struct PicoVideo *pv=&Pico.video;
4f265db7	235	int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
cc68a136	236	const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
	237	int skip=PicoSkipFrame \|\| (PicoOpt&0x10);
	238	int hint; // Hint counter
	239
	240	if(Pico.m.pal) { //
	241	//cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
	242	//cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
	243	lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
	244	line_sample = 68;
	245	if(pv->reg[1]&8) lines_vis = 240;
	246	} else {
	247	//cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
	248	//cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
	249	lines = 262;
	250	line_sample = 93;
	251	}
	252
	253	SekCyclesReset();
	254	SekCyclesResetS68k();
	255	//z80ExtraCycles = 0;
	256
	257	if(PicoOpt&4)
	258	z80CycleAim = 0;
	259	// z80_resetCycles();
	260
	261	pv->status&=~0x88; // clear V-Int, come out of vblank
	262
	263	hint=pv->reg[10]; // Load H-Int counter
	264	//dprintf("-hint: %i", hint);
	265
	266	for (y=0;y<lines;y++)
	267	{
	268	Pico.m.scanline=(short)y;
	269
	270	// pad delay (for 6 button pads)
	271	if(PicoOpt&0x20) {
	272	if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
	273	if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
	274	}
	275
bf098bc5	276	check_cd_dma();
bf098bc5	277
cc68a136	278	// H-Interrupts:
	279	if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
	280	{
	281	//dprintf("rhint:old @ %06x", SekPc);
	282	hint=pv->reg[10]; // Reload H-Int counter
	283	pv->pending_ints\|=0x10;
	284	if (pv->reg[0]&0x10) SekInterrupt(4);
	285	//dprintf("rhint: %i @ %06x [%i\|%i]", hint, SekPc, y, SekCycleCnt);
	286	//dprintf("hint_routine: %x", ((unsigned short)(Pico.ram+0x0B84)<<16)\|(unsigned short)(Pico.ram+0x0B86));
	287	}
	288
	289	// V-Interrupt:
	290	if (y == lines_vis)
	291	{
	292	//dprintf("vint: @ %06x [%i\|%i]", SekPc, y, SekCycleCnt);
	293	pv->status\|=0x88; // V-Int happened, go into vblank
	294	SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
	295	/*if(Pico.m.z80Run && (PicoOpt&4)) {
	296	z80CycleAim+=cycles_z80/2;
	297	total_z80+=z80_run(z80CycleAim-total_z80);
	298	z80CycleAim-=cycles_z80/2;
	299	}*/
	300	pv->pending_ints\|=0x20;
	301	if(pv->reg[1]&0x20) SekInterrupt(6);
	302	if(Pico.m.z80Run && (PicoOpt&4)) // ?
	303	z80_int();
	304	//dprintf("zint: [%i\|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
	305	}
	306
	307	// decide if we draw this line
	308	#if CAN_HANDLE_240_LINES
	309	if(!skip && ((!(pv->reg[1]&8) && y<224) \|\| ((pv->reg[1]&8) && y<240)) )
	310	#else
	311	if(!skip && y<224)
	312	#endif
	313	PicoLine(y);
	314
	315	if(PicoOpt&1)
	316	sound_timers_and_dac(y);
	317
	318	// get samples from sound chips
7a93adeb	319	if (y == 224 && PsndOut) {
	320	int len = sound_render(0, PsndLen);
	321	if (PicoWriteSound) PicoWriteSound(len);
	322	// clear sound buffer
	323	sound_clear();
	324	}
cc68a136	325
	326	// Run scanline:
	327	//dprintf("m68k starting exec @ %06x", SekPc);
89fa852d	328	if (Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
89fa852d	329	if ((PicoOpt & 0x2000) && (Pico_mcd->m.busreq&3) == 1) {
7336a99a	330	SekRunPS(cycles_68k, cycles_s68k); // "better/perfect sync"
68cba51e	331	} else {
	332	SekRun(cycles_68k);
	333	if ((Pico_mcd->m.busreq&3) == 1) // no busreq/no reset
	334	SekRunS68k(cycles_s68k);
cc68a136	335	}
cc68a136	336
89fa852d	337	if ((PicoOpt&4) && Pico.m.z80Run) {
d9153729	338	if (Pico.m.z80Run & 2) z80CycleAim+=cycles_z80;
	339	else {
	340	int cnt = SekCyclesDone() - z80startCycle;
	341	cnt = (cnt>>1)-(cnt>>5);
	342	//if (cnt > cycles_z80) printf("FIXME: z80 cycles: %i\n", cnt);
	343	if (cnt > cycles_z80) cnt = cycles_z80;
	344	Pico.m.z80Run \|= 2;
	345	z80CycleAim+=cnt;
	346	}
cc68a136	347	total_z80+=z80_run(z80CycleAim-total_z80);
	348	}
	349
4f265db7	350	update_chips();
cc68a136	351	}
	352
	353	// draw a frame just after vblank in alternative render mode
89fa852d	354	if (!PicoSkipFrame && (PicoOpt&0x10))
cc68a136	355	PicoFrameFull();
	356
	357	return 0;
	358	}
	359
	360
	361	int PicoFrameMCD(void)
	362	{
	363	if(!(PicoOpt&0x10))
	364	PicoFrameStart();
	365
	366	PicoFrameHintsMCD();
	367
	368	return 0;
	369	}
	370
	371