[picodrive.git] / Pico / VideoPort.c

// PicoDrive\r
\r
// (c) Copyright 2004 Dave, All rights reserved.\r
// (c) Copyright 2006-2008, Grazvydas "notaz" Ignotas\r
// Free for non-commercial use.\r
\r
// For commercial use, separate licencing terms must be obtained.\r
\r
\r
#include "PicoInt.h"\r
#include "cd/gfx_cd.h"\r
\r
extern const unsigned char  hcounts_32[];\r
extern const unsigned char  hcounts_40[];\r
\r
#ifndef UTYPES_DEFINED\r
typedef unsigned char  u8;\r
typedef unsigned short u16;\r
typedef unsigned int   u32;\r
#define UTYPES_DEFINED\r
#endif\r
\r
int (*PicoDmaHook)(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) = NULL;\r
\r
static __inline void AutoIncrement(void)\r
{\r
  Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
}\r
\r
static void VideoWrite(u16 d)\r
{\r
  unsigned int a=Pico.video.addr;\r
\r
  switch (Pico.video.type)\r
  {\r
    case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r
            Pico.vram [(a>>1)&0x7fff]=d;\r
            if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)\r
              rendstatus |= PDRAW_DIRTY_SPRITES;\r
            break;\r
    case 3: Pico.m.dirtyPal = 1;\r
            Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r
    case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r
    //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;\r
  }\r
\r
  AutoIncrement();\r
}\r
\r
static unsigned int VideoRead(void)\r
{\r
  unsigned int a=0,d=0;\r
\r
  a=Pico.video.addr; a>>=1;\r
\r
  switch (Pico.video.type)\r
  {\r
    case 0: d=Pico.vram [a&0x7fff]; break;\r
    case 8: d=Pico.cram [a&0x003f]; break;\r
    case 4: d=Pico.vsram[a&0x003f]; break;\r
    default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;\r
  }\r
\r
  AutoIncrement();\r
  return d;\r
}\r
\r
static int GetDmaLength(void)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
  int len=0;\r
  // 16-bit words to transfer:\r
  len =pvid->reg[0x13];\r
  len|=pvid->reg[0x14]<<8;\r
  // Charles MacDonald:\r
  if(!len) len = 0xffff;\r
  return len;\r
}\r
\r
static void DmaSlow(int len)\r
{\r
  u16 *pd=0, *pdend, *r;\r
  unsigned int a=Pico.video.addr, a2, d;\r
  unsigned char inc=Pico.video.reg[0xf];\r
  unsigned int source;\r
\r
  source =Pico.video.reg[0x15]<<1;\r
  source|=Pico.video.reg[0x16]<<9;\r
  source|=Pico.video.reg[0x17]<<17;\r
\r
  elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",\r
    Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),\r
    SekCyclesDone(), SekPc);\r
\r
  Pico.m.dma_xfers += len;\r
  if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_PSYNC)) SekCyclesBurn(CheckDMA());\r
  else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r
\r
  if ((source&0xe00000)==0xe00000) { // Ram\r
    pd=(u16 *)(Pico.ram+(source&0xfffe));\r
    pdend=(u16 *)(Pico.ram+0x10000);\r
  }\r
  else if (PicoAHW & PAHW_MCD)\r
  {\r
    elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r
    if(source<0x20000) { // Bios area\r
      pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
      pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
    } else if ((source&0xfc0000)==0x200000) { // Word Ram\r
      source -= 2;\r
      if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
        pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r
        pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r
      } else {\r
        if (source < 0x220000) { // 1M mode\r
          int bank = Pico_mcd->s68k_regs[3]&1;\r
          pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));\r
          pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);\r
        } else {\r
          DmaSlowCell(source, a, len, inc);\r
          return;\r
        }\r
      }\r
    } else if ((source&0xfe0000)==0x020000) { // Prg Ram\r
      u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
      pd=(u16 *)(prg_ram+(source&0x1fffe));\r
      pdend=(u16 *)(prg_ram+0x20000);\r
    } else {\r
      elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);\r
      return;\r
    }\r
  }\r
  else\r
  {\r
    // if we have DmaHook, let it handle ROM because of possible DMA delay\r
    if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));\r
    else if (source<Pico.romsize) { // Rom\r
      pd=(u16 *)(Pico.rom+(source&~1));\r
      pdend=(u16 *)(Pico.rom+Pico.romsize);\r
    }\r
    else {\r
      elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);\r
      return;\r
    }\r
  }\r
\r
  // overflow protection, might break something..\r
  if (len > pdend - pd) {\r
    len = pdend - pd;\r
    elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow");\r
  }\r
\r
  switch (Pico.video.type)\r
  {\r
    case 1: // vram\r
      r = Pico.vram;\r
      if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r
      {\r
        // most used DMA mode\r
        memcpy16(r + (a>>1), pd, len);\r
        a += len*2;\r
      }\r
      else\r
      {\r
        for(; len; len--)\r
        {\r
          d=*pd++;\r
          if(a&1) d=(d<<8)|(d>>8);\r
          r[a>>1] = (u16)d; // will drop the upper bits\r
          // AutoIncrement\r
          a=(u16)(a+inc);\r
          // didn't src overlap?\r
          //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r
        }\r
      }\r
      rendstatus |= PDRAW_DIRTY_SPRITES;\r
      break;\r
\r
    case 3: // cram\r
      Pico.m.dirtyPal = 1;\r
      r = Pico.cram;\r
      for(a2=a&0x7f; len; len--)\r
      {\r
        r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r
        // AutoIncrement\r
        a2+=inc;\r
        // didn't src overlap?\r
        //if(pd >= pdend) pd-=0x8000;\r
        // good dest?\r
        if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r
      }\r
      a=(a&0xff00)|a2;\r
      break;\r
\r
    case 5: // vsram[a&0x003f]=d;\r
      r = Pico.vsram;\r
      for(a2=a&0x7f; len; len--)\r
      {\r
        r[a2>>1] = (u16)*pd++;\r
        // AutoIncrement\r
        a2+=inc;\r
        // didn't src overlap?\r
        //if(pd >= pdend) pd-=0x8000;\r
        // good dest?\r
        if(a2 >= 0x80) break;\r
      }\r
      a=(a&0xff00)|a2;\r
      break;\r
\r
    default:\r
      elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);\r
      break;\r
  }\r
  // remember addr\r
  Pico.video.addr=(u16)a;\r
}\r
\r
static void DmaCopy(int len)\r
{\r
  u16 a=Pico.video.addr;\r
  unsigned char *vr = (unsigned char *) Pico.vram;\r
  unsigned char *vrs;\r
  unsigned char inc=Pico.video.reg[0xf];\r
  int source;\r
  elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());\r
\r
  Pico.m.dma_xfers += len;\r
  Pico.video.status |= 2; // dma busy\r
\r
  source =Pico.video.reg[0x15];\r
  source|=Pico.video.reg[0x16]<<8;\r
  vrs=vr+source;\r
\r
  if (source+len > 0x10000) len=0x10000-source; // clip??\r
\r
  for (; len; len--)\r
  {\r
    vr[a] = *vrs++;\r
    // AutoIncrement\r
    a=(u16)(a+inc);\r
  }\r
  // remember addr\r
  Pico.video.addr=a;\r
  rendstatus |= PDRAW_DIRTY_SPRITES;\r
}\r
\r
// check: Contra, Megaman\r
// note: this is still inaccurate\r
static void DmaFill(int data)\r
{\r
  int len;\r
  unsigned short a=Pico.video.addr;\r
  unsigned char *vr=(unsigned char *) Pico.vram;\r
  unsigned char high = (unsigned char) (data >> 8);\r
  unsigned char inc=Pico.video.reg[0xf];\r
\r
  len=GetDmaLength();\r
  elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());\r
\r
  Pico.m.dma_xfers += len;\r
  Pico.video.status |= 2; // dma busy\r
\r
  // from Charles MacDonald's genvdp.txt:\r
  // Write lower byte to address specified\r
  vr[a] = (unsigned char) data;\r
  a=(u16)(a+inc);\r
\r
  if (!inc) len=1;\r
\r
  for (; len; len--) {\r
    // Write upper byte to adjacent address\r
    // (here we are byteswapped, so address is already 'adjacent')\r
    vr[a] = high;\r
\r
    // Increment address register\r
    a=(u16)(a+inc);\r
  }\r
  // remember addr\r
  Pico.video.addr=a;\r
  // update length\r
  Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r
\r
  rendstatus |= PDRAW_DIRTY_SPRITES;\r
}\r
\r
static void CommandDma(void)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
  int len=0,method=0;\r
\r
  if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
\r
  len=GetDmaLength();\r
\r
  method=pvid->reg[0x17]>>6;\r
  if (method< 2) DmaSlow(len); // 68000 to VDP\r
  if (method==3) DmaCopy(len); // VRAM Copy\r
}\r
\r
static void CommandChange(void)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
  unsigned int cmd=0,addr=0;\r
\r
  cmd=pvid->command;\r
\r
  // Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
  pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));\r
\r
  // Get address 0x3fff0003\r
  addr =(cmd>>16)&0x3fff;\r
  addr|=(cmd<<14)&0xc000;\r
  pvid->addr=(unsigned short)addr;\r
\r
  // Check for dma:\r
  if (cmd&0x80) CommandDma();\r
}\r
\r
static __inline void DrawSync(int blank_on)\r
{\r
  if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) &&\r
      !PicoSkipFrame && DrawScanline <= Pico.m.scanline) {\r
    //elprintf(EL_ANOMALY, "sync");\r
    PicoDrawSync(Pico.m.scanline, blank_on);\r
  }\r
}\r
\r
PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
{\r
  struct PicoVideo *pvid=&Pico.video;\r
\r
  //if (Pico.m.scanline < 224)\r
  //  elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x", a, d);\r
  a&=0x1c;\r
\r
  if (a==0x00) // Data port 0 or 2\r
  {\r
    // try avoiding the sync..\r
    if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&\r
        !(!pvid->pending &&\r
          ((pvid->command & 0xc00000f0) == 0x40000010 && Pico.vsram[pvid->addr>>1] == d))\r
       )\r
      DrawSync(0);\r
\r
    if (pvid->pending) {\r
      CommandChange();\r
      pvid->pending=0;\r
    }\r
\r
    // If a DMA fill has been set up, do it\r
    if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
    {\r
      DmaFill(d);\r
    }\r
    else\r
    {\r
      // preliminary FIFO emulation for Chaos Engine, The (E)\r
      if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?\r
      {\r
        pvid->status&=~0x200; // FIFO no longer empty\r
        pvid->lwrite_cnt++;\r
        if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full\r
        if (pvid->lwrite_cnt >  4) {\r
          SekCyclesBurn(32); // penalty // 488/12-8\r
          if (SekCycleCnt>=SekCycleAim) SekEndRun(0);\r
        }\r
        elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc);\r
      }\r
      VideoWrite(d);\r
    }\r
    return;\r
  }\r
\r
  if (a==0x04) // Control (command) port 4 or 6\r
  {\r
    if (pvid->pending)\r
    {\r
      if (d & 0x80) DrawSync(0); // only need sync for DMA\r
      // Low word of command:\r
      pvid->command&=0xffff0000;\r
      pvid->command|=d;\r
      pvid->pending=0;\r
      CommandChange();\r
    }\r
    else\r
    {\r
      if ((d&0xc000)==0x8000)\r
      {\r
        // Register write:\r
        int num=(d>>8)&0x1f;\r
        int dold=pvid->reg[num];\r
        int update_irq = 0, blank_on = 0;\r
        pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
        if (num > 0x0a && !(pvid->reg[1]&4)) {\r
          elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);\r
          return;\r
        }\r
\r
        switch (num)\r
        {\r
          case 0x00:\r
            elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,\r
                    (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
            update_irq = 1;\r
            break;\r
          case 0x01:\r
            elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,\r
                    (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
            if (!(d&0x40) && SekCyclesLeft > 390) blank_on = 1;\r
            update_irq = 1;\r
            break;\r
          case 0x05:\r
            if (d^dold) rendstatus |= PDRAW_SPRITES_MOVED;\r
            break;\r
          case 0x0c:\r
            // renderers should update their palettes if sh/hi mode is changed\r
            if ((d^dold)&8) Pico.m.dirtyPal = 2;\r
            break;\r
        }\r
        DrawSync(blank_on);\r
        pvid->reg[num]=(unsigned char)d;\r
        if (!update_irq) return;\r
\r
#ifndef EMU_CORE_DEBUG\r
        // update IRQ level\r
        if (!SekShouldInterrupt) // hack\r
        {\r
          int lines, pints, irq=0;\r
          lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);\r
          pints = (pvid->pending_ints&lines);\r
               if (pints & 0x20) irq = 6;\r
          else if (pints & 0x10) irq = 4;\r
          SekInterrupt(irq); // update line\r
\r
          if (irq) SekEndRun(24); // make it delayed\r
        }\r
#endif\r
      }\r
      else\r
      {\r
        // High word of command:\r
        pvid->command&=0x0000ffff;\r
        pvid->command|=d<<16;\r
        pvid->pending=1;\r
      }\r
    }\r
  }\r
}\r
\r
PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
{\r
  a&=0x1c;\r
\r
  if (a==0x04) // control port\r
  {\r
    struct PicoVideo *pv=&Pico.video;\r
    unsigned int d;\r
    d=pv->status;\r
    //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)\r
    if (SekCyclesLeft < 84+4)      d|=0x0004; // H-Blank (Sonic3 vs)\r
\r
    d |= ((pv->reg[1]&0x40)^0x40) >> 3;  // set V-Blank if display is disabled\r
    d |= (pv->pending_ints&0x20)<<2;     // V-int pending?\r
    if (d&0x100) pv->status&=~0x100; // FIFO no longer full\r
\r
    pv->pending = 0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
\r
    elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);\r
    return d;\r
  }\r
\r
  // H-counter info (based on Generator):\r
  // frame:\r
  //                       |       <- hblank? ->      |\r
  // start    <416>       hint  <36> hdisplay <38>  end // CPU cycles\r
  // |---------...---------|------------|-------------|\r
  // 0                   B6 E4                       FF // 40 cells\r
  // 0                   93 E8                       FF // 32 cells\r
\r
  // Gens (?)              v-render\r
  // start  <hblank=84>   hint    hdisplay <404>      |\r
  // |---------------------|--------------------------|\r
  // E4  (hc[0x43]==0)    07                         B1 // 40\r
  // E8  (hc[0x45]==0)    05                         91 // 32\r
\r
  // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
  if ((a&0x1c)==0x08)\r
  {\r
    unsigned int d;\r
    int lineCycles;\r
\r
    lineCycles = (488-SekCyclesLeft)&0x1ff;\r
    if (Pico.video.reg[12]&1)\r
         d = hcounts_40[lineCycles];\r
    else d = hcounts_32[lineCycles];\r
\r
    elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);\r
    return d | (Pico.video.v_counter << 8);\r
  }\r
\r
  if (a==0x00) // data port\r
  {\r
    return VideoRead();\r
  }\r
\r
  return 0;\r
}\r
\r
unsigned int PicoVideoRead8(unsigned int a)\r
{\r
  unsigned int d;\r
  a&=0x1d;\r
\r
  switch (a)\r
  {\r
    case 0: return VideoRead() >> 8;\r
    case 1: return VideoRead() & 0xff;\r
    case 4: // control port/status reg\r
      d = Pico.video.status >> 8;\r
      if (d&1) Pico.video.status&=~0x100; // FIFO no longer full\r
      Pico.video.pending = 0;\r
      elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);\r
      return d;\r
    case 5:\r
      d = Pico.video.status & 0xff;\r
      //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)\r
      d |= ((Pico.video.reg[1]&0x40)^0x40) >> 3;  // set V-Blank if display is disabled\r
      d |= (Pico.video.pending_ints&0x20)<<2;     // V-int pending?\r
      if (SekCyclesLeft < 84+4) d |= 4;    // H-Blank\r
      Pico.video.pending = 0;\r
      elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);\r
      return d;\r
    case 8: // hv counter\r
      elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);\r
      return Pico.video.v_counter;\r
    case 9:\r
      d = (488-SekCyclesLeft)&0x1ff;\r
      if (Pico.video.reg[12]&1)\r
           d = hcounts_40[d];\r
      else d = hcounts_32[d];\r
      elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc);\r
      return d;\r
  }\r
\r
  return 0;\r
}\r
Commit	Line	Data
d9fc2fe1	1	// PicoDrive\r
cc68a136	2	\r
cc68a136	3	// (c) Copyright 2004 Dave, All rights reserved.\r
d9fc2fe1	4	// (c) Copyright 2006-2008, Grazvydas "notaz" Ignotas\r
cc68a136	5	// Free for non-commercial use.\r
	6	\r
	7	// For commercial use, separate licencing terms must be obtained.\r
	8	\r
	9	\r
	10	#include "PicoInt.h"\r
fa1e5e29	11	#include "cd/gfx_cd.h"\r
cc68a136	12	\r
	13	extern const unsigned char hcounts_32[];\r
	14	extern const unsigned char hcounts_40[];\r
cc68a136	15	\r
eff55556	16	#ifndef UTYPES_DEFINED\r
ab0607f7	17	typedef unsigned char u8;\r
cc68a136	18	typedef unsigned short u16;\r
eff55556	19	typedef unsigned int u32;\r
	20	#define UTYPES_DEFINED\r
	21	#endif\r
cc68a136	22	\r
5de27868	23	int (PicoDmaHook)(unsigned int source, int len, unsigned short srcp, unsigned short *limitp) = NULL;\r
cc68a136	24	\r
69996cb7	25	static __inline void AutoIncrement(void)\r
cc68a136	26	{\r
	27	Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);\r
	28	}\r
	29	\r
	30	static void VideoWrite(u16 d)\r
	31	{\r
	32	unsigned int a=Pico.video.addr;\r
	33	\r
	34	switch (Pico.video.type)\r
	35	{\r
	36	case 1: if(a&1) d=(u16)((d<<8)\|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)\r
	37	Pico.vram [(a>>1)&0x7fff]=d;\r
947fb5f9	38	if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)\r
	39	rendstatus \|= PDRAW_DIRTY_SPRITES;\r
	40	break;\r
cc68a136	41	case 3: Pico.m.dirtyPal = 1;\r
cc68a136	42	Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)\r
cc68a136	43	case 5: Pico.vsram[(a>>1)&0x003f]=d; break;\r
d26dc685	44	//default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;\r
cc68a136	45	}\r
cc68a136	46	\r
cc68a136	47	AutoIncrement();\r
	48	}\r
	49	\r
69996cb7	50	static unsigned int VideoRead(void)\r
cc68a136	51	{\r
	52	unsigned int a=0,d=0;\r
	53	\r
	54	a=Pico.video.addr; a>>=1;\r
	55	\r
	56	switch (Pico.video.type)\r
	57	{\r
	58	case 0: d=Pico.vram [a&0x7fff]; break;\r
	59	case 8: d=Pico.cram [a&0x003f]; break;\r
	60	case 4: d=Pico.vsram[a&0x003f]; break;\r
69996cb7	61	default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;\r
cc68a136	62	}\r
4f672280	63	\r
cc68a136	64	AutoIncrement();\r
	65	return d;\r
	66	}\r
	67	\r
69996cb7	68	static int GetDmaLength(void)\r
cc68a136	69	{\r
	70	struct PicoVideo *pvid=&Pico.video;\r
	71	int len=0;\r
	72	// 16-bit words to transfer:\r
	73	len =pvid->reg[0x13];\r
	74	len\|=pvid->reg[0x14]<<8;\r
	75	// Charles MacDonald:\r
	76	if(!len) len = 0xffff;\r
	77	return len;\r
	78	}\r
	79	\r
	80	static void DmaSlow(int len)\r
	81	{\r
	82	u16 pd=0, pdend, *r;\r
	83	unsigned int a=Pico.video.addr, a2, d;\r
	84	unsigned char inc=Pico.video.reg[0xf];\r
672ad671	85	unsigned int source;\r
cc68a136	86	\r
	87	source =Pico.video.reg[0x15]<<1;\r
	88	source\|=Pico.video.reg[0x16]<<9;\r
	89	source\|=Pico.video.reg[0x17]<<17;\r
	90	\r
69996cb7	91	elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",\r
312e9ce1	92	Pico.video.type, source, a, len, inc, (Pico.video.status&8)\|\|!(Pico.video.reg[1]&0x40),\r
69996cb7	93	SekCyclesDone(), SekPc);\r
cc68a136	94	\r
2aa27095	95	Pico.m.dma_xfers += len;\r
	96	if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_PSYNC)) SekCyclesBurn(CheckDMA());\r
	97	else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());\r
672ad671	98	\r
ab0607f7	99	if ((source&0xe00000)==0xe00000) { // Ram\r
	100	pd=(u16 *)(Pico.ram+(source&0xfffe));\r
	101	pdend=(u16 *)(Pico.ram+0x10000);\r
602133e1	102	}\r
	103	else if (PicoAHW & PAHW_MCD)\r
	104	{\r
69996cb7	105	elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);\r
ab0607f7	106	if(source<0x20000) { // Bios area\r
	107	pd=(u16 *)(Pico_mcd->bios+(source&~1));\r
	108	pdend=(u16 *)(Pico_mcd->bios+0x20000);\r
fa1e5e29	109	} else if ((source&0xfc0000)==0x200000) { // Word Ram\r
fa1e5e29	110	source -= 2;\r
ab0607f7	111	if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode\r
fa1e5e29	112	pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));\r
fa1e5e29	113	pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);\r
ab0607f7	114	} else {\r
fa1e5e29	115	if (source < 0x220000) { // 1M mode\r
	116	int bank = Pico_mcd->s68k_regs[3]&1;\r
	117	pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));\r
	118	pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);\r
69996cb7	119	} else {\r
fa1e5e29	120	DmaSlowCell(source, a, len, inc);\r
fa1e5e29	121	return;\r
69996cb7	122	}\r
ab0607f7	123	}\r
	124	} else if ((source&0xfe0000)==0x020000) { // Prg Ram\r
	125	u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];\r
	126	pd=(u16 *)(prg_ram+(source&0x1fffe));\r
	127	pdend=(u16 *)(prg_ram+0x20000);\r
	128	} else {\r
03e4f2a3	129	elprintf(EL_VDPDMA\|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);\r
ab0607f7	130	return;\r
ab0607f7	131	}\r
602133e1	132	}\r
	133	else\r
	134	{\r
50483b53	135	// if we have DmaHook, let it handle ROM because of possible DMA delay\r
	136	if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));\r
	137	else if (source<Pico.romsize) { // Rom\r
ab0607f7	138	pd=(u16 *)(Pico.rom+(source&~1));\r
ab0607f7	139	pdend=(u16 *)(Pico.rom+Pico.romsize);\r
f8ef8ff7	140	}\r
f8ef8ff7	141	else {\r
03e4f2a3	142	elprintf(EL_VDPDMA\|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);\r
ab0607f7	143	return;\r
	144	}\r
	145	}\r
	146	\r
	147	// overflow protection, might break something..\r
	148	if (len > pdend - pd) {\r
	149	len = pdend - pd;\r
69996cb7	150	elprintf(EL_VDPDMA\|EL_ANOMALY, "DmaSlow overflow");\r
672ad671	151	}\r
cc68a136	152	\r
	153	switch (Pico.video.type)\r
	154	{\r
	155	case 1: // vram\r
	156	r = Pico.vram;\r
cea65903	157	if (inc == 2 && !(a&1) && a+len*2 < 0x10000)\r
cc68a136	158	{\r
cea65903	159	// most used DMA mode\r
fa1e5e29	160	memcpy16(r + (a>>1), pd, len);\r
fa1e5e29	161	a += len*2;\r
cea65903	162	}\r
	163	else\r
	164	{\r
	165	for(; len; len--)\r
	166	{\r
	167	d=*pd++;\r
	168	if(a&1) d=(d<<8)\|(d>>8);\r
	169	r[a>>1] = (u16)d; // will drop the upper bits\r
	170	// AutoIncrement\r
	171	a=(u16)(a+inc);\r
	172	// didn't src overlap?\r
	173	//if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM\r
	174	}\r
cc68a136	175	}\r
602133e1	176	rendstatus \|= PDRAW_DIRTY_SPRITES;\r
cc68a136	177	break;\r
4f672280	178	\r
cc68a136	179	case 3: // cram\r
cc68a136	180	Pico.m.dirtyPal = 1;\r
	181	r = Pico.cram;\r
	182	for(a2=a&0x7f; len; len--)\r
	183	{\r
0a051f55	184	r[a2>>1] = (u16)*pd++; // bit 0 is ignored\r
cc68a136	185	// AutoIncrement\r
	186	a2+=inc;\r
	187	// didn't src overlap?\r
ab0607f7	188	//if(pd >= pdend) pd-=0x8000;\r
cc68a136	189	// good dest?\r
	190	if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis\r
	191	}\r
	192	a=(a&0xff00)\|a2;\r
	193	break;\r
	194	\r
	195	case 5: // vsram[a&0x003f]=d;\r
	196	r = Pico.vsram;\r
	197	for(a2=a&0x7f; len; len--)\r
	198	{\r
	199	r[a2>>1] = (u16)*pd++;\r
	200	// AutoIncrement\r
	201	a2+=inc;\r
	202	// didn't src overlap?\r
ab0607f7	203	//if(pd >= pdend) pd-=0x8000;\r
cc68a136	204	// good dest?\r
	205	if(a2 >= 0x80) break;\r
	206	}\r
	207	a=(a&0xff00)\|a2;\r
	208	break;\r
69996cb7	209	\r
	210	default:\r
	211	elprintf(EL_VDPDMA\|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);\r
	212	break;\r
cc68a136	213	}\r
	214	// remember addr\r
	215	Pico.video.addr=(u16)a;\r
	216	}\r
	217	\r
	218	static void DmaCopy(int len)\r
	219	{\r
	220	u16 a=Pico.video.addr;\r
	221	unsigned char vr = (unsigned char ) Pico.vram;\r
	222	unsigned char *vrs;\r
	223	unsigned char inc=Pico.video.reg[0xf];\r
	224	int source;\r
69996cb7	225	elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());\r
4f672280	226	\r
69996cb7	227	Pico.m.dma_xfers += len;\r
2aa27095	228	Pico.video.status \|= 2; // dma busy\r
cc68a136	229	\r
	230	source =Pico.video.reg[0x15];\r
	231	source\|=Pico.video.reg[0x16]<<8;\r
	232	vrs=vr+source;\r
	233	\r
2aa27095	234	if (source+len > 0x10000) len=0x10000-source; // clip??\r
cc68a136	235	\r
2aa27095	236	for (; len; len--)\r
cc68a136	237	{\r
	238	vr[a] = *vrs++;\r
	239	// AutoIncrement\r
	240	a=(u16)(a+inc);\r
	241	}\r
	242	// remember addr\r
	243	Pico.video.addr=a;\r
602133e1	244	rendstatus \|= PDRAW_DIRTY_SPRITES;\r
cc68a136	245	}\r
	246	\r
	247	// check: Contra, Megaman\r
	248	// note: this is still inaccurate\r
	249	static void DmaFill(int data)\r
	250	{\r
	251	int len;\r
	252	unsigned short a=Pico.video.addr;\r
	253	unsigned char vr=(unsigned char ) Pico.vram;\r
	254	unsigned char high = (unsigned char) (data >> 8);\r
	255	unsigned char inc=Pico.video.reg[0xf];\r
4f672280	256	\r
cc68a136	257	len=GetDmaLength();\r
69996cb7	258	elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());\r
4f672280	259	\r
69996cb7	260	Pico.m.dma_xfers += len;\r
2aa27095	261	Pico.video.status \|= 2; // dma busy\r
cc68a136	262	\r
	263	// from Charles MacDonald's genvdp.txt:\r
	264	// Write lower byte to address specified\r
	265	vr[a] = (unsigned char) data;\r
	266	a=(u16)(a+inc);\r
	267	\r
2aa27095	268	if (!inc) len=1;\r
cc68a136	269	\r
2aa27095	270	for (; len; len--) {\r
cc68a136	271	// Write upper byte to adjacent address\r
	272	// (here we are byteswapped, so address is already 'adjacent')\r
	273	vr[a] = high;\r
	274	\r
	275	// Increment address register\r
	276	a=(u16)(a+inc);\r
	277	}\r
	278	// remember addr\r
	279	Pico.video.addr=a;\r
	280	// update length\r
	281	Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)\r
	282	\r
602133e1	283	rendstatus \|= PDRAW_DIRTY_SPRITES;\r
cc68a136	284	}\r
cc68a136	285	\r
69996cb7	286	static void CommandDma(void)\r
cc68a136	287	{\r
	288	struct PicoVideo *pvid=&Pico.video;\r
	289	int len=0,method=0;\r
	290	\r
	291	if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled\r
	292	\r
	293	len=GetDmaLength();\r
	294	\r
	295	method=pvid->reg[0x17]>>6;\r
	296	if (method< 2) DmaSlow(len); // 68000 to VDP\r
	297	if (method==3) DmaCopy(len); // VRAM Copy\r
	298	}\r
	299	\r
69996cb7	300	static void CommandChange(void)\r
cc68a136	301	{\r
	302	struct PicoVideo *pvid=&Pico.video;\r
	303	unsigned int cmd=0,addr=0;\r
	304	\r
	305	cmd=pvid->command;\r
	306	\r
	307	// Get type of transfer 0xc0000030 (v/c/vsram read/write)\r
	308	pvid->type=(unsigned char)(((cmd>>2)&0xc)\|(cmd>>30));\r
	309	\r
	310	// Get address 0x3fff0003\r
	311	addr =(cmd>>16)&0x3fff;\r
	312	addr\|=(cmd<<14)&0xc000;\r
	313	pvid->addr=(unsigned short)addr;\r
cc68a136	314	\r
	315	// Check for dma:\r
	316	if (cmd&0x80) CommandDma();\r
	317	}\r
	318	\r
b6d7ac70	319	static __inline void DrawSync(int blank_on)\r
	320	{\r
	321	if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) &&\r
	322	!PicoSkipFrame && DrawScanline <= Pico.m.scanline) {\r
2aa27095	323	//elprintf(EL_ANOMALY, "sync");\r
b6d7ac70	324	PicoDrawSync(Pico.m.scanline, blank_on);\r
	325	}\r
	326	}\r
	327	\r
eff55556	328	PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)\r
cc68a136	329	{\r
	330	struct PicoVideo *pvid=&Pico.video;\r
	331	\r
2aa27095	332	//if (Pico.m.scanline < 224)\r
2aa27095	333	// elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x", a, d);\r
cc68a136	334	a&=0x1c;\r
	335	\r
	336	if (a==0x00) // Data port 0 or 2\r
4f672280	337	{\r
b6d7ac70	338	// try avoiding the sync..\r
	339	if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&\r
	340	!(!pvid->pending &&\r
	341	((pvid->command & 0xc00000f0) == 0x40000010 && Pico.vsram[pvid->addr>>1] == d))\r
	342	)\r
	343	DrawSync(0);\r
	344	\r
69996cb7	345	if (pvid->pending) {\r
	346	CommandChange();\r
	347	pvid->pending=0;\r
	348	}\r
cc68a136	349	\r
	350	// If a DMA fill has been set up, do it\r
	351	if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)\r
	352	{\r
	353	DmaFill(d);\r
	354	}\r
	355	else\r
	356	{\r
69996cb7	357	// preliminary FIFO emulation for Chaos Engine, The (E)\r
2aa27095	358	if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?\r
69996cb7	359	{\r
	360	pvid->status&=~0x200; // FIFO no longer empty\r
	361	pvid->lwrite_cnt++;\r
	362	if (pvid->lwrite_cnt >= 4) pvid->status\|=0x100; // FIFO full\r
	363	if (pvid->lwrite_cnt > 4) {\r
	364	SekCyclesBurn(32); // penalty // 488/12-8\r
	365	if (SekCycleCnt>=SekCycleAim) SekEndRun(0);\r
	366	}\r
	367	elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc);\r
	368	}\r
cc68a136	369	VideoWrite(d);\r
	370	}\r
	371	return;\r
	372	}\r
	373	\r
	374	if (a==0x04) // Control (command) port 4 or 6\r
	375	{\r
b6d7ac70	376	if (pvid->pending)\r
cc68a136	377	{\r
b6d7ac70	378	if (d & 0x80) DrawSync(0); // only need sync for DMA\r
cc68a136	379	// Low word of command:\r
	380	pvid->command&=0xffff0000;\r
	381	pvid->command\|=d;\r
	382	pvid->pending=0;\r
	383	CommandChange();\r
602133e1	384	}\r
	385	else\r
	386	{\r
	387	if ((d&0xc000)==0x8000)\r
cc68a136	388	{\r
	389	// Register write:\r
	390	int num=(d>>8)&0x1f;\r
0ffefdb8	391	int dold=pvid->reg[num];\r
b6d7ac70	392	int update_irq = 0, blank_on = 0;\r
602133e1	393	pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)\r
0ffefdb8	394	if (num > 0x0a && !(pvid->reg[1]&4)) {\r
0ffefdb8	395	elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);\r
602133e1	396	return;\r
b6d7ac70	397	}\r
602133e1	398	\r
	399	switch (num)\r
	400	{\r
	401	case 0x00:\r
	402	elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,\r
	403	(d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);\r
b6d7ac70	404	update_irq = 1;\r
b6d7ac70	405	break;\r
602133e1	406	case 0x01:\r
	407	elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,\r
	408	(d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);\r
b6d7ac70	409	if (!(d&0x40) && SekCyclesLeft > 390) blank_on = 1;\r
	410	update_irq = 1;\r
	411	break;\r
602133e1	412	case 0x05:\r
	413	if (d^dold) rendstatus \|= PDRAW_SPRITES_MOVED;\r
	414	break;\r
	415	case 0x0c:\r
	416	// renderers should update their palettes if sh/hi mode is changed\r
	417	if ((d^dold)&8) Pico.m.dirtyPal = 2;\r
	418	break;\r
	419	}\r
b6d7ac70	420	DrawSync(blank_on);\r
	421	pvid->reg[num]=(unsigned char)d;\r
	422	if (!update_irq) return;\r
602133e1	423	\r
03e4f2a3	424	#ifndef EMU_CORE_DEBUG\r
b6d7ac70	425	// update IRQ level\r
602133e1	426	if (!SekShouldInterrupt) // hack\r
03e4f2a3	427	{\r
602133e1	428	int lines, pints, irq=0;\r
	429	lines = (pvid->reg[1] & 0x20) \| (pvid->reg[0] & 0x10);\r
	430	pints = (pvid->pending_ints&lines);\r
b6d7ac70	431	if (pints & 0x20) irq = 6;\r
b6d7ac70	432	else if (pints & 0x10) irq = 4;\r
602133e1	433	SekInterrupt(irq); // update line\r
602133e1	434	\r
2aa27095	435	if (irq) SekEndRun(24); // make it delayed\r
cc68a136	436	}\r
cc68a136	437	#endif\r
602133e1	438	}\r
	439	else\r
	440	{\r
cc68a136	441	// High word of command:\r
	442	pvid->command&=0x0000ffff;\r
	443	pvid->command\|=d<<16;\r
	444	pvid->pending=1;\r
	445	}\r
	446	}\r
	447	}\r
	448	}\r
	449	\r
eff55556	450	PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)\r
cc68a136	451	{\r
cc68a136	452	a&=0x1c;\r
cc68a136	453	\r
cc68a136	454	if (a==0x04) // control port\r
cc68a136	455	{\r
69996cb7	456	struct PicoVideo *pv=&Pico.video;\r
b6d7ac70	457	unsigned int d;\r
69996cb7	458	d=pv->status;\r
9761a7d0	459	//if (PicoOpt&POPT_ALT_RENDERER) d\|=0x0020; // sprite collision (Shadow of the Beast)\r
602133e1	460	if (SekCyclesLeft < 84+4) d\|=0x0004; // H-Blank (Sonic3 vs)\r
69996cb7	461	\r
9761a7d0	462	d \|= ((pv->reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled\r
9761a7d0	463	d \|= (pv->pending_ints&0x20)<<2; // V-int pending?\r
69996cb7	464	if (d&0x100) pv->status&=~0x100; // FIFO no longer full\r
cc68a136	465	\r
9761a7d0	466	pv->pending = 0; // ctrl port reads clear write-pending flag (Charles MacDonald)\r
cc68a136	467	\r
69996cb7	468	elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);\r
b6d7ac70	469	return d;\r
cc68a136	470	}\r
	471	\r
	472	// H-counter info (based on Generator):\r
	473	// frame:\r
	474	// \| <- hblank? -> \|\r
	475	// start <416> hint <36> hdisplay <38> end // CPU cycles\r
	476	// \|---------...---------\|------------\|-------------\|\r
	477	// 0 B6 E4 FF // 40 cells\r
	478	// 0 93 E8 FF // 32 cells\r
	479	\r
	480	// Gens (?) v-render\r
	481	// start <hblank=84> hint hdisplay <404> \|\r
	482	// \|---------------------\|--------------------------\|\r
	483	// E4 (hc[0x43]==0) 07 B1 // 40\r
	484	// E8 (hc[0x45]==0) 05 91 // 32\r
4f672280	485	\r
cc68a136	486	// check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune\r
	487	if ((a&0x1c)==0x08)\r
	488	{\r
9761a7d0	489	unsigned int d;\r
2aa27095	490	int lineCycles;\r
947fb5f9	491	\r
2aa27095	492	lineCycles = (488-SekCyclesLeft)&0x1ff;\r
2aa27095	493	if (Pico.video.reg[12]&1)\r
9761a7d0	494	d = hcounts_40[lineCycles];\r
9761a7d0	495	else d = hcounts_32[lineCycles];\r
cc68a136	496	\r
9761a7d0	497	elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);\r
	498	return d \| (Pico.video.v_counter << 8);\r
	499	}\r
cc68a136	500	\r
9761a7d0	501	if (a==0x00) // data port\r
	502	{\r
	503	return VideoRead();\r
	504	}\r
cc68a136	505	\r
9761a7d0	506	return 0;\r
	507	}\r
	508	\r
	509	unsigned int PicoVideoRead8(unsigned int a)\r
	510	{\r
	511	unsigned int d;\r
	512	a&=0x1d;\r
	513	\r
	514	switch (a)\r
	515	{\r
	516	case 0: return VideoRead() >> 8;\r
	517	case 1: return VideoRead() & 0xff;\r
	518	case 4: // control port/status reg\r
	519	d = Pico.video.status >> 8;\r
	520	if (d&1) Pico.video.status&=~0x100; // FIFO no longer full\r
	521	Pico.video.pending = 0;\r
	522	elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);\r
	523	return d;\r
	524	case 5:\r
	525	d = Pico.video.status & 0xff;\r
	526	//if (PicoOpt&POPT_ALT_RENDERER) d\|=0x0020; // sprite collision (Shadow of the Beast)\r
	527	d \|= ((Pico.video.reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled\r
	528	d \|= (Pico.video.pending_ints&0x20)<<2; // V-int pending?\r
	529	if (SekCyclesLeft < 84+4) d \|= 4; // H-Blank\r
	530	Pico.video.pending = 0;\r
	531	elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);\r
	532	return d;\r
	533	case 8: // hv counter\r
	534	elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);\r
	535	return Pico.video.v_counter;\r
	536	case 9:\r
	537	d = (488-SekCyclesLeft)&0x1ff;\r
	538	if (Pico.video.reg[12]&1)\r
	539	d = hcounts_40[d];\r
	540	else d = hcounts_32[d];\r
	541	elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc);\r
	542	return d;\r
cc68a136	543	}\r
cc68a136	544	\r
b6d7ac70	545	return 0;\r
cc68a136	546	}\r