1 // This is part of Pico Library
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3 // (c) Copyright 2004 Dave, All rights reserved.
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4 // (c) Copyright 2006,2007 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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12 #include "sn76496.h"
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14 #include "../PicoInt.h"
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15 #include "../cd/pcm.h"
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18 // master int buffer to mix to
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19 static int PsndBuffer[2*44100/50];
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22 static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
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26 int PsndLen=0; // number of mono samples, multiply by 2 for stereo
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27 int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
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28 int PsndLen_exc_cnt=0;
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29 short *PsndOut=NULL; // PCM data buffer
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32 extern int *sn76496_regs;
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35 static void dac_recalculate(void)
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37 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
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39 if(PsndLen <= lines) {
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45 for(i=226; i != 225; i++) {
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46 if (i >= lines) i = 0;
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54 dac_info[i] = (pos<<4)|len;
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60 for(i = 225; i != 224; i++) {
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61 if (i >= lines) i = 0;
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63 while(dac_cnt >= 0) {
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67 if (i == mid) // midpoint
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68 while(pos+len < PsndLen/2) {
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73 dac_info[i] = (pos<<4)|len;
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77 for(len = 0, i = pos; i < PsndLen; i++) len++;
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78 if (PsndLen_exc_add) len++;
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79 dac_info[224] = (pos<<4)|len;
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81 //for(i=len=0; i < lines; i++) {
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82 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
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83 // len+=dac_info[i]&0xf;
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85 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));
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86 //printf("len total: %i, last pos: %i\n", len, pos);
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91 PICO_INTERNAL void PsndReset(void)
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95 // also clear the internal registers+addr line
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96 ym2612_regs = YM2612GetRegs();
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97 memset(ym2612_regs, 0, 0x200+4);
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98 z80startCycle = z80stopCycle = 0;
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104 // to be called after changing sound rate or chips
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105 void PsndRerate(int preserve_state)
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107 void *state = NULL;
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108 int target_fps = Pico.m.pal ? 50 : 60;
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110 // not all rates are supported in MCD mode due to mp3 decoder limitations
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112 if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;
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113 PicoOpt |= 8; // force stereo
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116 if (preserve_state) {
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117 state = malloc(0x200);
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118 if (state == NULL) return;
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119 memcpy(state, YM2612GetRegs(), 0x200);
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120 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)
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121 Pico_mcd->m.audio_offset = mp3_get_offset();
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123 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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124 if (preserve_state) {
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125 // feed it back it's own registers, just like after loading state
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126 memcpy(YM2612GetRegs(), state, 0x200);
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127 YM2612PicoStateLoad();
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128 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)
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129 mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);
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132 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
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133 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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134 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
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139 // calculate PsndLen
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140 PsndLen=PsndRate / target_fps;
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141 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
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144 // recalculate dac info
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148 pcm_set_rate(PsndRate);
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150 // clear all buffers
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151 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
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157 // This is called once per raster (aka line), but not necessarily for every line
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158 PICO_INTERNAL void Psnd_timers_and_dac(int raster)
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161 int do_dac = PsndOut && (PicoOpt&1) && *ym2612_dacen;
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162 // int do_pcm = PsndOut && (PicoMCD&1) && (PicoOpt&0x400);
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164 // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)
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167 if (!do_dac /*&& !do_pcm*/) return;
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169 pos=dac_info[raster], len=pos&0xf;
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175 short *d = PsndOut + pos*2;
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176 int dout = *ym2612_dacout;
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178 // some manual loop unrolling here :)
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186 short *d = PsndOut + pos;
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198 int *d = PsndBuffer;
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199 d += (PicoOpt&8) ? pos*2 : pos;
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200 pcm_update(d, len, 1);
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206 PICO_INTERNAL void PsndClear(void)
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209 if (PsndLen_exc_add) len++;
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211 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned
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213 short *out = PsndOut;
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214 if ((int)out & 2) { *out++ = 0; len--; }
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215 memset32((int *) out, 0, len/2);
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216 if (len & 1) out[len-1] = 0;
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221 PICO_INTERNAL int PsndRender(int offset, int length)
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223 int buf32_updated = 0;
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224 int *buf32 = PsndBuffer+offset;
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225 int stereo = (PicoOpt & 8) >> 3;
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226 // emulating CD && PCM option enabled && PCM chip on && have enabled channels
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227 int do_pcm = (PicoMCD&1) && (PicoOpt&0x400) && (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;
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230 if (offset == 0) { // should happen once per frame
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231 // compensate for float part of PsndLen
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232 PsndLen_exc_cnt += PsndLen_exc_add;
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233 if (PsndLen_exc_cnt >= 0x10000) {
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234 PsndLen_exc_cnt -= 0x10000;
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241 SN76496Update(PsndOut+offset, length, stereo);
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243 // Add in the stereo FM buffer
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245 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
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247 memset32(buf32, 0, length<<stereo);
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249 //printf("active_chs: %02x\n", buf32_updated);
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253 pcm_update(buf32, length, stereo);
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254 //buf32_updated = 1;
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258 // CD mode, cdda enabled, not data track, CDC is reading
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259 if ((PicoMCD & 1) && (PicoOpt & 0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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260 mp3_update(buf32, length, stereo);
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262 // convert + limit to normal 16bit output
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264 mix_32_to_16l_stereo(PsndOut+offset, buf32, length);
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265 else mix_32_to_16_mono (PsndOut+offset, buf32, length);
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272 #if defined(_USE_MZ80)
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274 // memhandlers for mz80 core
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275 unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
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276 void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
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278 // structures for mz80 core
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279 static struct MemoryReadByte mz80_mem_read[]=
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281 {0x0000,0xffff,mz80_read},
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282 {(UINT32) -1,(UINT32) -1,NULL}
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284 static struct MemoryWriteByte mz80_mem_write[]=
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286 {0x0000,0xffff,mz80_write},
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287 {(UINT32) -1,(UINT32) -1,NULL}
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289 static struct z80PortRead mz80_io_read[] ={
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290 {(UINT16) -1,(UINT16) -1,NULL}
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292 static struct z80PortWrite mz80_io_write[]={
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293 {(UINT16) -1,(UINT16) -1,NULL}
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296 int mz80_run(int cycles)
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298 int ticks_pre = mz80GetElapsedTicks(0);
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300 return mz80GetElapsedTicks(0) - ticks_pre;
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303 #elif defined(_USE_DRZ80)
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305 struct DrZ80 drZ80;
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307 static unsigned int DrZ80_rebasePC(unsigned short a)
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309 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
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310 return drZ80.Z80PC_BASE + a;
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313 static unsigned int DrZ80_rebaseSP(unsigned short a)
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315 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
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316 return drZ80.Z80SP_BASE + a;
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319 static void DrZ80_irq_callback()
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321 drZ80.Z80_IRQ = 0; // lower irq when accepted
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325 #if defined(_USE_DRZ80) || defined(_USE_CZ80)
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326 static unsigned char z80_in(unsigned short p)
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328 elprintf(EL_ANOMALY, "Z80 port %04x read", p);
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332 static void z80_out(unsigned short p,unsigned char d)
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334 elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);
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339 // z80 functionality wrappers
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340 PICO_INTERNAL void z80_init(void)
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342 #if defined(_USE_MZ80)
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343 struct mz80context z80;
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347 // Modify the default context
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348 mz80GetContext(&z80);
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350 // point mz80 stuff
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351 z80.z80Base=Pico.zram;
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352 z80.z80MemRead=mz80_mem_read;
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353 z80.z80MemWrite=mz80_mem_write;
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354 z80.z80IoRead=mz80_io_read;
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355 z80.z80IoWrite=mz80_io_write;
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357 mz80SetContext(&z80);
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359 #elif defined(_USE_DRZ80)
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360 memset(&drZ80, 0, sizeof(struct DrZ80));
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361 drZ80.z80_rebasePC=DrZ80_rebasePC;
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362 drZ80.z80_rebaseSP=DrZ80_rebaseSP;
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363 drZ80.z80_read8 =z80_read;
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364 drZ80.z80_read16 =z80_read16;
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365 drZ80.z80_write8 =z80_write;
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366 drZ80.z80_write16 =z80_write16;
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367 drZ80.z80_in =z80_in;
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368 drZ80.z80_out =z80_out;
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369 drZ80.z80_irq_callback=DrZ80_irq_callback;
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371 #elif defined(_USE_CZ80)
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372 memset(&CZ80, 0, sizeof(CZ80));
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374 Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM
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375 Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror
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376 Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)
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377 Cz80_Set_WriteB(&CZ80, z80_write);
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378 Cz80_Set_INPort(&CZ80, z80_in);
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379 Cz80_Set_OUTPort(&CZ80, z80_out);
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383 PICO_INTERNAL void z80_reset(void)
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385 #if defined(_USE_MZ80)
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387 #elif defined(_USE_DRZ80)
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388 memset(&drZ80, 0, 0x54);
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389 drZ80.Z80F = (1<<2); // set ZFlag
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390 drZ80.Z80F2 = (1<<2); // set ZFlag
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391 drZ80.Z80IX = 0xFFFF << 16;
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392 drZ80.Z80IY = 0xFFFF << 16;
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393 drZ80.Z80IM = 0; // 1?
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394 drZ80.Z80PC = drZ80.z80_rebasePC(0);
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395 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
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396 #elif defined(_USE_CZ80)
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398 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
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399 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
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400 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
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402 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
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406 PICO_INTERNAL void z80_pack(unsigned char *data)
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408 #if defined(_USE_MZ80)
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409 struct mz80context mz80;
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410 *(int *)data = 0x00005A6D; // "mZ"
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411 mz80GetContext(&mz80);
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412 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
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413 #elif defined(_USE_DRZ80)
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414 *(int *)data = 0x015A7244; // "DrZ" v1
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415 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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416 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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417 memcpy(data+4, &drZ80, 0x54);
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418 #elif defined(_USE_CZ80)
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419 *(int *)data = 0x00007a43; // "Cz"
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420 *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
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421 memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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425 PICO_INTERNAL void z80_unpack(unsigned char *data)
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427 #if defined(_USE_MZ80)
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428 if (*(int *)data == 0x00005A6D) { // "mZ" save?
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429 struct mz80context mz80;
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430 mz80GetContext(&mz80);
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431 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
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432 mz80SetContext(&mz80);
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437 #elif defined(_USE_DRZ80)
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438 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
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439 memcpy(&drZ80, data+4, 0x54);
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441 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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442 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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446 z80_int(); // try to goto int handler, maybe we won't execute trash there?
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448 #elif defined(_USE_CZ80)
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449 if (*(int *)data == 0x00007a43) { // "Cz" save?
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450 memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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451 Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
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459 PICO_INTERNAL void z80_exit(void)
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461 #if defined(_USE_MZ80)
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466 #if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)
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467 PICO_INTERNAL void z80_debug(char *dstr)
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469 #if defined(_USE_DRZ80)
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470 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
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471 #elif defined(_USE_CZ80)
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472 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);
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