3 // (c) Copyright 2004 Dave, All rights reserved.
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4 // (c) Copyright 2006-2008 notaz, All rights reserved.
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5 // Free for non-commercial use.
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7 // For commercial use, separate licencing terms must be obtained.
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10 #include "pico_int.h"
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11 #include "sound/ym2612.h"
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15 int PicoSkipFrame; // skip rendering frame?
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16 int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU
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17 int PicoPadInt[2]; // internal copy
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18 int PicoAHW; // active addon hardware: PAHW_*
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19 int PicoRegionOverride; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe
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20 int PicoAutoRgnOrder;
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22 struct PicoSRAM SRam;
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23 int emustatus; // rapid_ym2612, multi_ym_updates
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24 int scanlines_total;
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26 void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware
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27 void (*PicoResetHook)(void) = NULL;
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28 void (*PicoLineHook)(void) = NULL;
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30 // to be called once on emu init
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33 // Blank space for state:
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34 memset(&Pico,0,sizeof(Pico));
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35 memset(&PicoPad,0,sizeof(PicoPad));
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36 memset(&PicoPadInt,0,sizeof(PicoPadInt));
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40 z80_init(); // init even if we aren't going to use it
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47 // to be called once on emu exit
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50 if (PicoAHW & PAHW_MCD)
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59 void PicoPower(void)
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61 Pico.m.frame_count = 0;
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63 // clear all memory of the emulated machine
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64 memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
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66 memset(&Pico.video,0,sizeof(Pico.video));
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67 memset(&Pico.m,0,sizeof(Pico.m));
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69 Pico.video.pending_ints=0;
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72 // default VDP register values (based on Fusion)
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73 Pico.video.reg[0] = Pico.video.reg[1] = 0x04;
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74 Pico.video.reg[0xc] = 0x81;
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75 Pico.video.reg[0xf] = 0x02;
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77 if (PicoAHW & PAHW_MCD)
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80 if (PicoOpt & POPT_EN_32X)
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86 PICO_INTERNAL void PicoDetectRegion(void)
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88 int support=0, hw=0, i;
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89 unsigned char pal=0;
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91 if (PicoRegionOverride)
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93 support = PicoRegionOverride;
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97 // Read cartridge region data:
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98 unsigned short *rd = (unsigned short *)(Pico.rom + 0x1f0);
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99 int region = (rd[0] << 16) | rd[1];
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101 for (i = 0; i < 4; i++)
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105 c = region >> (i<<3);
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107 if (c <= ' ') continue;
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109 if (c=='J') support|=1;
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110 else if (c=='U') support|=4;
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111 else if (c=='E') support|=8;
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112 else if (c=='j') {support|=1; break; }
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113 else if (c=='u') {support|=4; break; }
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114 else if (c=='e') {support|=8; break; }
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120 support|=strtol(s,NULL,16);
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125 // auto detection order override
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126 if (PicoAutoRgnOrder) {
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127 if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;
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128 else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;
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129 else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;
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132 // Try to pick the best hardware value for English/50hz:
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133 if (support&8) { hw=0xc0; pal=1; } // Europe
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134 else if (support&4) hw=0x80; // USA
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135 else if (support&2) { hw=0x40; pal=1; } // Japan PAL
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136 else if (support&1) hw=0x00; // Japan NTSC
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137 else hw=0x80; // USA
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139 Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached
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143 int PicoReset(void)
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145 if (Pico.romsize <= 0)
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148 /* must call now, so that banking is reset, and correct vectors get fetched */
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152 memset(&PicoPadInt,0,sizeof(PicoPadInt));
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155 if (PicoAHW & PAHW_SMS) {
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161 // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).
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162 SekSetRealTAS(PicoAHW & PAHW_MCD);
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165 if (PicoAHW & PAHW_MCD)
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166 // needed for MCD to reset properly, probably some bug hides behind this..
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167 memset(Pico.ioports,0,sizeof(Pico.ioports));
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169 Pico.m.dirtyPal = 1;
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171 Pico.m.z80_bank68k = 0;
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172 Pico.m.z80_reset = 1;
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173 memset(Pico.zram, 0, sizeof(Pico.zram)); // ??
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175 PicoDetectRegion();
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176 Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal
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178 PsndReset(); // pal must be known here
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180 // create an empty "dma" to cause 68k exec start at random frame location
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181 if (Pico.m.dma_xfers == 0 && !(PicoOpt & POPT_DIS_VDP_FIFO))
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182 Pico.m.dma_xfers = rand() & 0x1fff;
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184 SekFinishIdleDet();
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186 if (PicoAHW & PAHW_MCD) {
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191 // reinit, so that checksum checks pass
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192 if (!(PicoOpt & POPT_DIS_IDLE_DET))
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195 if (PicoOpt & POPT_EN_32X) {
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200 // reset sram state; enable sram access by default if it doesn't overlap with ROM
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201 Pico.m.sram_reg = 0;
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202 if ((SRam.flags & SRF_EEPROM) || Pico.romsize <= SRam.start)
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203 Pico.m.sram_reg |= SRR_MAPPED;
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205 if (SRam.flags & SRF_ENABLED)
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206 elprintf(EL_STATUS, "sram: %06x - %06x; eeprom: %i", SRam.start, SRam.end,
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207 !!(SRam.flags & SRF_EEPROM));
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212 // flush cinfig changes before emu loop starts
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213 void PicoLoopPrepare(void)
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215 if (PicoRegionOverride)
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216 // force setting possibly changed..
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217 Pico.m.pal = (PicoRegionOverride == 2 || PicoRegionOverride == 8) ? 1 : 0;
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219 // FIXME: PAL has 313 scanlines..
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220 scanlines_total = Pico.m.pal ? 312 : 262;
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222 if (PicoAHW & PAHW_32X)
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223 p32x_timers_recalc();
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227 // dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)
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228 // same for Outrunners (92-121, when active is set to 24)
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230 static const int dma_timings[] = {
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231 96, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
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232 102, 205, 204, 102, // vblank: 40cell:
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233 16, 16, 15, 8, // active: 32cell:
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234 24, 18, 17, 9 // ...
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237 static const int dma_bsycles[] = {
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238 (488<<8)/96, (488<<8)/167, (488<<8)/166, (488<<8)/83,
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239 (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,
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240 (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,
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241 (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9
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244 PICO_INTERNAL int CheckDMA(void)
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246 int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes
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247 int xfers = Pico.m.dma_xfers;
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250 if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens
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252 if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?
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253 if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?
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254 xfers_can = dma_timings[dma_op];
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255 if(xfers <= xfers_can)
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257 if(dma_op&2) Pico.video.status&=~2; // dma no longer busy
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259 burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..
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261 Pico.m.dma_xfers = 0;
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263 if(!(dma_op&2)) burn = 488;
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264 Pico.m.dma_xfers -= xfers_can;
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267 elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());
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268 //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);
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272 static __inline void SekRunM68k(int cyc)
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276 if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;
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277 #if defined(EMU_CORE_DEBUG)
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278 // this means we do run-compare
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279 SekCycleCnt+=CM_compareRun(cyc_do, 0);
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280 #elif defined(EMU_C68K)
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281 PicoCpuCM68k.cycles=cyc_do;
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282 CycloneRun(&PicoCpuCM68k);
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283 SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;
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284 #elif defined(EMU_M68K)
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285 SekCycleCnt+=m68k_execute(cyc_do);
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286 #elif defined(EMU_F68K)
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287 SekCycleCnt+=fm68k_emulate(cyc_do+1, 0, 0);
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291 #include "pico_cmn.c"
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294 int z80_cycle_cnt; /* 'done' z80 cycles before z80_run() */
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297 int z80_scanline_cycles; /* cycles done until z80_scanline */
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299 /* sync z80 to 68k */
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300 PICO_INTERNAL void PicoSyncZ80(int m68k_cycles_done)
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303 z80_cycle_aim = cycles_68k_to_z80(m68k_cycles_done);
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304 cnt = z80_cycle_aim - z80_cycle_cnt;
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306 elprintf(EL_BUSREQ, "z80 sync %i (%i|%i -> %i|%i)", cnt, z80_cycle_cnt, z80_cycle_cnt / 228,
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307 z80_cycle_aim, z80_cycle_aim / 228);
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310 z80_cycle_cnt += z80_run(cnt);
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314 void PicoFrame(void)
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316 Pico.m.frame_count++;
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318 if (PicoAHW & PAHW_SMS) {
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324 if (PicoAHW & PAHW_MCD) {
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329 if (PicoAHW & PAHW_32X) {
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334 //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode
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340 void PicoFrameDrawOnly(void)
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342 if (!(PicoAHW & PAHW_SMS)) {
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344 PicoDrawSync(223, 0);
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346 PicoFrameDrawOnlyMS();
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350 void PicoGetInternal(pint_t which, pint_ret_t *r)
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354 case PI_ROM: r->vptr = Pico.rom; break;
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355 case PI_ISPAL: r->vint = Pico.m.pal; break;
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356 case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break;
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357 case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;
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361 // callback to output message from emu
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362 void (*PicoMessage)(const char *msg)=NULL;
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