X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Pico%2FVideoPort.c;h=7a38ea9c43af928445448702647978754c65c173;hb=9761a7d0d41ad429d53c64ff35fe061c38092dbf;hp=024cf6f4e3dc76d82866c51ea7d0d2ae07425a6b;hpb=cc68a136aa179a5f32fe40208371eb9c2b0aadae;p=picodrive.git diff --git a/Pico/VideoPort.c b/Pico/VideoPort.c index 024cf6f..7a38ea9 100644 --- a/Pico/VideoPort.c +++ b/Pico/VideoPort.c @@ -1,23 +1,28 @@ // This is part of Pico Library // (c) Copyright 2004 Dave, All rights reserved. -// (c) Copyright 2006 notaz, All rights reserved. +// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas // Free for non-commercial use. // For commercial use, separate licencing terms must be obtained. #include "PicoInt.h" +#include "cd/gfx_cd.h" extern const unsigned char hcounts_32[]; extern const unsigned char hcounts_40[]; -extern const unsigned short vcounts[]; -extern int rendstatus; +#ifndef UTYPES_DEFINED +typedef unsigned char u8; typedef unsigned short u16; +typedef unsigned int u32; +#define UTYPES_DEFINED +#endif +int (*PicoDmaHook)(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) = NULL; -static __inline void AutoIncrement() +static __inline void AutoIncrement(void) { Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]); } @@ -30,18 +35,17 @@ static void VideoWrite(u16 d) { case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?) Pico.vram [(a>>1)&0x7fff]=d; - rendstatus|=0x10; break; + rendstatus |= PDRAW_DIRTY_SPRITES; break; case 3: Pico.m.dirtyPal = 1; - //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone()); Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike) case 5: Pico.vsram[(a>>1)&0x003f]=d; break; + //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break; } - //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone()); AutoIncrement(); } -static unsigned int VideoRead() +static unsigned int VideoRead(void) { unsigned int a=0,d=0; @@ -52,31 +56,14 @@ static unsigned int VideoRead() case 0: d=Pico.vram [a&0x7fff]; break; case 8: d=Pico.cram [a&0x003f]; break; case 4: d=Pico.vsram[a&0x003f]; break; + default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break; } - + AutoIncrement(); return d; } -// calculate the number of cycles 68k->VDP dma operation would take -static int DmaSlowBurn(int len) -{ - // test: Legend of Galahad, Time Killers - int burn,maxlen,line=Pico.m.scanline; - - if(line == -1) line=vcounts[SekCyclesDone()>>8]; - maxlen=(224-line)*18; - if(len <= maxlen) - burn = len*(((488<<8)/18))>>8; - else { - burn = maxlen*(((488<<8)/18))>>8; - burn += (len-maxlen)*(((488<<8)/180))>>8; - } - - return burn; -} - -static int GetDmaLength() +static int GetDmaLength(void) { struct PicoVideo *pvid=&Pico.video; int len=0; @@ -93,58 +80,110 @@ static void DmaSlow(int len) u16 *pd=0, *pdend, *r; unsigned int a=Pico.video.addr, a2, d; unsigned char inc=Pico.video.reg[0xf]; - unsigned int source, burn; + unsigned int source; source =Pico.video.reg[0x15]<<1; source|=Pico.video.reg[0x16]<<9; source|=Pico.video.reg[0x17]<<17; - //dprintf("DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i|%i]", Pico.video.type, source, a, len, inc, - // (Pico.video.status&8)||!(Pico.video.reg[1]&0x40), Pico.m.scanline, SekCyclesDone()); + elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x", + Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40), + SekCyclesDone(), SekPc); + + Pico.m.dma_xfers += len; + if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_PSYNC)) SekCyclesBurn(CheckDMA()); + else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA()); - if ((source&0xe00000)==0xe00000) { pd=(u16 *)(Pico.ram+(source&0xfffe)); pdend=(u16 *)(Pico.ram+0x10000); } // Ram - else if(sources68k_regs[3]); + if(source<0x20000) { // Bios area + pd=(u16 *)(Pico_mcd->bios+(source&~1)); + pdend=(u16 *)(Pico_mcd->bios+0x20000); + } else if ((source&0xfc0000)==0x200000) { // Word Ram + source -= 2; + if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode + pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe)); + pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000); + } else { + if (source < 0x220000) { // 1M mode + int bank = Pico_mcd->s68k_regs[3]&1; + pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe)); + pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000); + } else { + DmaSlowCell(source, a, len, inc); + return; + } + } + } else if ((source&0xfe0000)==0x020000) { // Prg Ram + u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6]; + pd=(u16 *)(prg_ram+(source&0x1fffe)); + pdend=(u16 *)(prg_ram+0x20000); + } else { + elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a); + return; + } + } + else + { + // if we have DmaHook, let it handle ROM because of possible DMA delay + if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend)); + else if (source%04x: invalid src", Pico.video.type, source, a); + return; + } + } - // CPU is stopped during DMA, so we burn some cycles to compensate that - if((Pico.video.status&8)||!(Pico.video.reg[1]&0x40)) { // vblank? - burn = (len*(((488<<8)/167))>>8); // very approximate - if(!(Pico.video.status&8)) burn+=burn>>1; // a hack for Legend of Galahad - } else burn = DmaSlowBurn(len); - SekCyclesBurn(burn); - if(!(Pico.video.status&8)) - SekEndRun(0); - //dprintf("DmaSlow burn: %i @ %06x", burn, SekPc); + // overflow protection, might break something.. + if (len > pdend - pd) { + len = pdend - pd; + elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow"); + } switch (Pico.video.type) { case 1: // vram r = Pico.vram; - for(; len; len--) + if (inc == 2 && !(a&1) && a+len*2 < 0x10000) { - d=*pd++; - if(a&1) d=(d<<8)|(d>>8); - r[a>>1] = (u16)d; // will drop the upper bits - // AutoIncrement - a=(u16)(a+inc); - // didn't src overlap? - if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM + // most used DMA mode + memcpy16(r + (a>>1), pd, len); + a += len*2; + } + else + { + for(; len; len--) + { + d=*pd++; + if(a&1) d=(d<<8)|(d>>8); + r[a>>1] = (u16)d; // will drop the upper bits + // AutoIncrement + a=(u16)(a+inc); + // didn't src overlap? + //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM + } } - rendstatus|=0x10; + rendstatus |= PDRAW_DIRTY_SPRITES; break; - + case 3: // cram - //dprintf("DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i|%i]", Pico.video.type, source, a, len, inc, - // (Pico.video.status&8)||!(Pico.video.reg[1]&0x40), Pico.m.scanline, SekCyclesDone()); Pico.m.dirtyPal = 1; r = Pico.cram; for(a2=a&0x7f; len; len--) { - r[a2>>1] = (u16)*pd++;; // bit 0 is ignored + r[a2>>1] = (u16)*pd++; // bit 0 is ignored // AutoIncrement a2+=inc; // didn't src overlap? - if(pd >= pdend) pd-=0x8000; + //if(pd >= pdend) pd-=0x8000; // good dest? if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis } @@ -159,12 +198,16 @@ static void DmaSlow(int len) // AutoIncrement a2+=inc; // didn't src overlap? - if(pd >= pdend) pd-=0x8000; + //if(pd >= pdend) pd-=0x8000; // good dest? if(a2 >= 0x80) break; } a=(a&0xff00)|a2; break; + + default: + elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type); + break; } // remember addr Pico.video.addr=(u16)a; @@ -177,15 +220,18 @@ static void DmaCopy(int len) unsigned char *vrs; unsigned char inc=Pico.video.reg[0xf]; int source; - //dprintf("DmaCopy len %i [%i|%i]", len, Pico.m.scanline, SekCyclesDone()); + elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone()); + + Pico.m.dma_xfers += len; + Pico.video.status |= 2; // dma busy source =Pico.video.reg[0x15]; source|=Pico.video.reg[0x16]<<8; vrs=vr+source; - if(source+len > 0x10000) len=0x10000-source; // clip?? + if (source+len > 0x10000) len=0x10000-source; // clip?? - for(;len;len--) + for (; len; len--) { vr[a] = *vrs++; // AutoIncrement @@ -193,7 +239,7 @@ static void DmaCopy(int len) } // remember addr Pico.video.addr=a; - rendstatus|=0x10; + rendstatus |= PDRAW_DIRTY_SPRITES; } // check: Contra, Megaman @@ -205,18 +251,21 @@ static void DmaFill(int data) unsigned char *vr=(unsigned char *) Pico.vram; unsigned char high = (unsigned char) (data >> 8); unsigned char inc=Pico.video.reg[0xf]; - + len=GetDmaLength(); - //dprintf("DmaFill len %i inc %i [%i|%i]", len, inc, Pico.m.scanline, SekCyclesDone()); + elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone()); + + Pico.m.dma_xfers += len; + Pico.video.status |= 2; // dma busy // from Charles MacDonald's genvdp.txt: // Write lower byte to address specified vr[a] = (unsigned char) data; a=(u16)(a+inc); - if(!inc) len=1; + if (!inc) len=1; - for(;len;len--) { + for (; len; len--) { // Write upper byte to adjacent address // (here we are byteswapped, so address is already 'adjacent') vr[a] = high; @@ -229,10 +278,10 @@ static void DmaFill(int data) // update length Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze) - rendstatus|=0x10; + rendstatus |= PDRAW_DIRTY_SPRITES; } -static void CommandDma() +static void CommandDma(void) { struct PicoVideo *pvid=&Pico.video; int len=0,method=0; @@ -246,7 +295,7 @@ static void CommandDma() if (method==3) DmaCopy(len); // VRAM Copy } -static void CommandChange() +static void CommandChange(void) { struct PicoVideo *pvid=&Pico.video; unsigned int cmd=0,addr=0; @@ -260,22 +309,41 @@ static void CommandChange() addr =(cmd>>16)&0x3fff; addr|=(cmd<<14)&0xc000; pvid->addr=(unsigned short)addr; - //dprintf("addr set: %04x", addr); // Check for dma: if (cmd&0x80) CommandDma(); } -void PicoVideoWrite(unsigned int a,unsigned short d) +static __inline void DrawSync(int blank_on) +{ + if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) && + !PicoSkipFrame && DrawScanline <= Pico.m.scanline) { + //elprintf(EL_ANOMALY, "sync"); + PicoDrawSync(Pico.m.scanline, blank_on); + } +} + +PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d) { struct PicoVideo *pvid=&Pico.video; + //if (Pico.m.scanline < 224) + // elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x", a, d); a&=0x1c; if (a==0x00) // Data port 0 or 2 - { - if (pvid->pending) CommandChange(); - pvid->pending=0; + { + // try avoiding the sync.. + if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) && + !(!pvid->pending && + ((pvid->command & 0xc00000f0) == 0x40000010 && Pico.vsram[pvid->addr>>1] == d)) + ) + DrawSync(0); + + if (pvid->pending) { + CommandChange(); + pvid->pending=0; + } // If a DMA fill has been set up, do it if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2) @@ -284,6 +352,18 @@ void PicoVideoWrite(unsigned int a,unsigned short d) } else { + // preliminary FIFO emulation for Chaos Engine, The (E) + if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display? + { + pvid->status&=~0x200; // FIFO no longer empty + pvid->lwrite_cnt++; + if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full + if (pvid->lwrite_cnt > 4) { + SekCyclesBurn(32); // penalty // 488/12-8 + if (SekCycleCnt>=SekCycleAim) SekEndRun(0); + } + elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc); + } VideoWrite(d); } return; @@ -291,54 +371,71 @@ void PicoVideoWrite(unsigned int a,unsigned short d) if (a==0x04) // Control (command) port 4 or 6 { - //dprintf("vdp cw(%04x), p=%i @ %06x [%i]", d, pvid->pending, SekPc, SekCyclesDone()); - if(pvid->pending) + if (pvid->pending) { + if (d & 0x80) DrawSync(0); // only need sync for DMA // Low word of command: pvid->command&=0xffff0000; pvid->command|=d; pvid->pending=0; CommandChange(); - } else { - if((d&0xc000)==0x8000) + } + else + { + if ((d&0xc000)==0x8000) { // Register write: int num=(d>>8)&0x1f; - //if(num==00) dprintf("hint_onoff: %i->%i [%i|%i] pend=%i @ %06x", (pvid->reg[0]&0x10)>>4, (d&0x10)>>4, Pico.m.scanline, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc); - //if(num==01) dprintf("vint_onoff: %i->%i [%i|%i] pend=%i @ %06x", (pvid->reg[1]&0x20)>>5, (d&0x20)>>5, Pico.m.scanline, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc); - //if(num==01) dprintf("set_blank: %i @ %06x [%i|%i]", !((d&0x40)>>6), SekPc, Pico.m.scanline, SekCyclesDone()); - //if(num==05) dprintf("spr_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone()); - //if(num==10) dprintf("hint_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone()); + int dold=pvid->reg[num]; + int update_irq = 0, blank_on = 0; + pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II) + if (num > 0x0a && !(pvid->reg[1]&4)) { + elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc); + return; + } + + switch (num) + { + case 0x00: + elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4, + (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc); + update_irq = 1; + break; + case 0x01: + elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5, + (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc); + if (!(d&0x40) && SekCyclesLeft > 390) blank_on = 1; + update_irq = 1; + break; + case 0x05: + if (d^dold) rendstatus |= PDRAW_SPRITES_MOVED; + break; + case 0x0c: + // renderers should update their palettes if sh/hi mode is changed + if ((d^dold)&8) Pico.m.dirtyPal = 2; + break; + } + DrawSync(blank_on); pvid->reg[num]=(unsigned char)d; -#if !(defined(EMU_C68K) && defined(EMU_M68K)) // not debugging Cyclone - // update IRQ level (Lemmings, Wiz 'n' Liz intro, ... ) - // may break if done improperly: - // International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx), Fatal Rewind (hang), Sesame Street Counting Cafe - if(num < 2) { -#ifdef EMU_C68K - // hack: make sure we do not touch the irq line if Cyclone is just about to take the IRQ - if (PicoCpu.irq <= (PicoCpu.srh&7)) { -#endif - int lines, pints; - lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10); - pints = (pvid->pending_ints&lines); - if(pints & 0x20) SekInterrupt(6); - else if(pints & 0x10) SekInterrupt(4); - else SekInterrupt(0); -#ifdef EMU_C68K - // adjust cycles for Cyclone so it would take the int "in time" - if(PicoCpu.irq) { - SekEndRun(24); - } - } -#endif + if (!update_irq) return; + +#ifndef EMU_CORE_DEBUG + // update IRQ level + if (!SekShouldInterrupt) // hack + { + int lines, pints, irq=0; + lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10); + pints = (pvid->pending_ints&lines); + if (pints & 0x20) irq = 6; + else if (pints & 0x10) irq = 4; + SekInterrupt(irq); // update line + + if (irq) SekEndRun(24); // make it delayed } - else #endif - if(num == 5) rendstatus|=1; - else if(num == 0xc) Pico.m.dirtyPal = 2; // renderers should update their palettes if sh/hi mode is changed - pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II) - } else { + } + else + { // High word of command: pvid->command&=0x0000ffff; pvid->command|=d<<16; @@ -348,30 +445,26 @@ void PicoVideoWrite(unsigned int a,unsigned short d) } } -unsigned int PicoVideoRead(unsigned int a) +PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a) { - unsigned int d=0; - a&=0x1c; - if (a==0x00) // data port - { - d=VideoRead(); - goto end; - } - if (a==0x04) // control port { - //dprintf("sr_read @ %06x [%i|%i]", SekPc, Pico.m.scanline, SekCyclesDone()); - d=Pico.video.status; - if(PicoOpt&0x10) d|=0x0020; // sprite collision (Shadow of the Beast) - if(Pico.m.rotate++&8) d|=0x0100; else d|=0x0200; // Toggle fifo full empty (who uses that stuff?) - if(!(Pico.video.reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled - if(SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs) + struct PicoVideo *pv=&Pico.video; + unsigned int d; + d=pv->status; + //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast) + if (SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs) + + d |= ((pv->reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled + d |= (pv->pending_ints&0x20)<<2; // V-int pending? + if (d&0x100) pv->status&=~0x100; // FIFO no longer full - Pico.video.pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald) + pv->pending = 0; // ctrl port reads clear write-pending flag (Charles MacDonald) - goto end; + elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc); + return d; } // H-counter info (based on Generator): @@ -387,46 +480,65 @@ unsigned int PicoVideoRead(unsigned int a) // |---------------------|--------------------------| // E4 (hc[0x43]==0) 07 B1 // 40 // E8 (hc[0x45]==0) 05 91 // 32 - + // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune if ((a&0x1c)==0x08) { - unsigned int hc; - - if(Pico.m.scanline != -1) { - int lineCycles=(488-SekCyclesLeft)&0x1ff; - d=Pico.m.scanline; // V-Counter + unsigned int d; + int lineCycles; + + lineCycles = (488-SekCyclesLeft)&0x1ff; + if (Pico.video.reg[12]&1) + d = hcounts_40[lineCycles]; + else d = hcounts_32[lineCycles]; - if(Pico.video.reg[12]&1) - hc=hcounts_40[lineCycles]; - else hc=hcounts_32[lineCycles]; + elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc); + return d | (Pico.video.v_counter << 8); + } - if(lineCycles > 488-12) d++; // Wheel of Fortune - } else { - // get approximate V-Counter - d=vcounts[SekCyclesDone()>>8]; - hc = Pico.m.rotate&0xff; - } + if (a==0x00) // data port + { + return VideoRead(); + } - if(Pico.m.pal) { - if(d >= 0x103) d-=56; // based on Gens - } else { - if(d >= 0xEB) d-=6; - } + return 0; +} - if((Pico.video.reg[12]&6) == 6) { - // interlace mode 2 (Combat Cars (UE) [!]) - d <<= 1; - if (d&0xf00) d|= 1; - } +unsigned int PicoVideoRead8(unsigned int a) +{ + unsigned int d; + a&=0x1d; - //dprintf("hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc); - d&=0xff; d<<=8; - d|=hc; - goto end; + switch (a) + { + case 0: return VideoRead() >> 8; + case 1: return VideoRead() & 0xff; + case 4: // control port/status reg + d = Pico.video.status >> 8; + if (d&1) Pico.video.status&=~0x100; // FIFO no longer full + Pico.video.pending = 0; + elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc); + return d; + case 5: + d = Pico.video.status & 0xff; + //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast) + d |= ((Pico.video.reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled + d |= (Pico.video.pending_ints&0x20)<<2; // V-int pending? + if (SekCyclesLeft < 84+4) d |= 4; // H-Blank + Pico.video.pending = 0; + elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc); + return d; + case 8: // hv counter + elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc); + return Pico.video.v_counter; + case 9: + d = (488-SekCyclesLeft)&0x1ff; + if (Pico.video.reg[12]&1) + d = hcounts_40[d]; + else d = hcounts_32[d]; + elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc); + return d; } -end: - - return d; + return 0; }