[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;


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