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 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 #if defined(_USE_MZ80)
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15 #include "../../cpu/mz80/mz80.h"
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16 #elif defined(_USE_DRZ80)
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17 #include "../../cpu/DrZ80/drz80.h"
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20 #include "../PicoInt.h"
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21 #include "../cd/pcm.h"
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24 // master int buffer to mix to
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25 static int PsndBuffer[2*44100/50];
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28 static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
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32 int PsndLen=0; // number of mono samples, multiply by 2 for stereo
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33 int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
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34 int PsndLen_exc_cnt=0;
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35 short *PsndOut=NULL; // PCM data buffer
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38 extern int *ym2612_dacen;
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39 extern INT32 *ym2612_dacout;
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40 void YM2612TimerHandler(int c,int cnt);
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43 extern int *sn76496_regs;
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46 static void dac_recalculate(void)
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48 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
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50 if(PsndLen <= lines) {
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56 for(i=226; i != 225; i++) {
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57 if (i >= lines) i = 0;
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65 dac_info[i] = (pos<<4)|len;
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71 for(i = 225; i != 224; i++) {
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72 if (i >= lines) i = 0;
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74 while(dac_cnt >= 0) {
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78 if (i == mid) // midpoint
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79 while(pos+len < PsndLen/2) {
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84 dac_info[i] = (pos<<4)|len;
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88 for(len = 0, i = pos; i < PsndLen; i++) len++;
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89 if (PsndLen_exc_add) len++;
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90 dac_info[224] = (pos<<4)|len;
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92 //for(i=len=0; i < lines; i++) {
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93 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
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94 // len+=dac_info[i]&0xf;
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96 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));
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97 //printf("len total: %i, last pos: %i\n", len, pos);
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102 PICO_INTERNAL void sound_reset(void)
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106 // also clear the internal registers+addr line
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107 ym2612_regs = YM2612GetRegs();
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108 memset(ym2612_regs, 0, 0x200+4);
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109 z80startCycle = z80stopCycle = 0;
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115 // to be called after changing sound rate or chips
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116 void sound_rerate(int preserve_state)
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118 void *state = NULL;
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119 int target_fps = Pico.m.pal ? 50 : 60;
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121 // not all rates are supported in MCD mode due to mp3 decoder limitations
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123 if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;
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124 PicoOpt |= 8; // force stereo
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127 if (preserve_state) {
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128 state = malloc(0x200);
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129 if (state == NULL) return;
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130 memcpy(state, YM2612GetRegs(), 0x200);
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131 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)
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132 Pico_mcd->m.audio_offset = mp3_get_offset();
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134 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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135 if (preserve_state) {
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136 // feed it back it's own registers, just like after loading state
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137 memcpy(YM2612GetRegs(), state, 0x200);
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138 YM2612PicoStateLoad();
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139 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)
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140 mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);
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143 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
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144 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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145 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
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150 // calculate PsndLen
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151 PsndLen=PsndRate / target_fps;
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152 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
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155 // recalculate dac info
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159 pcm_set_rate(PsndRate);
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161 // clear all buffers
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162 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
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168 // This is called once per raster (aka line), but not necessarily for every line
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169 PICO_INTERNAL void sound_timers_and_dac(int raster)
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172 int do_dac = PsndOut && (PicoOpt&1) && *ym2612_dacen;
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173 // int do_pcm = PsndOut && (PicoMCD&1) && (PicoOpt&0x400);
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175 // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)
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178 if (!do_dac /*&& !do_pcm*/) return;
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180 pos=dac_info[raster], len=pos&0xf;
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186 short *d = PsndOut + pos*2;
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187 int dout = *ym2612_dacout;
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189 // some manual loop unrolling here :)
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197 short *d = PsndOut + pos;
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209 int *d = PsndBuffer;
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210 d += (PicoOpt&8) ? pos*2 : pos;
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211 pcm_update(d, len, 1);
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217 PICO_INTERNAL void sound_clear(void)
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220 if (PsndLen_exc_add) len++;
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221 if (PicoOpt & 8) memset32((int *) PsndOut, 0, len); // clear both channels at once
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222 else memset(PsndOut, 0, len<<1);
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226 PICO_INTERNAL int sound_render(int offset, int length)
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228 int buf32_updated = 0;
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229 int *buf32 = PsndBuffer+offset;
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230 int stereo = (PicoOpt & 8) >> 3;
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231 // emulating CD && PCM option enabled && PCM chip on && have enabled channels
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232 int do_pcm = (PicoMCD&1) && (PicoOpt&0x400) && (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;
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235 if (offset == 0) { // should happen once per frame
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236 // compensate for float part of PsndLen
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237 PsndLen_exc_cnt += PsndLen_exc_add;
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238 if (PsndLen_exc_cnt >= 0x10000) {
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239 PsndLen_exc_cnt -= 0x10000;
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246 SN76496Update(PsndOut+offset, length, stereo);
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248 // Add in the stereo FM buffer
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250 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
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252 memset32(buf32, 0, length<<stereo);
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254 //printf("active_chs: %02x\n", buf32_updated);
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258 pcm_update(buf32, length, stereo);
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259 //buf32_updated = 1;
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263 // CD mode, cdda enabled, not data track, CDC is reading
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264 if ((PicoMCD & 1) && (PicoOpt & 0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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265 mp3_update(buf32, length, stereo);
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267 // convert + limit to normal 16bit output
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269 mix_32_to_16l_stereo(PsndOut+offset, buf32, length);
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270 else mix_32_to_16_mono (PsndOut+offset, buf32, length);
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277 #if defined(_USE_MZ80)
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279 // memhandlers for mz80 core
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280 unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
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281 void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
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283 // structures for mz80 core
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284 static struct MemoryReadByte mz80_mem_read[]=
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286 {0x0000,0xffff,mz80_read},
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287 {(UINT32) -1,(UINT32) -1,NULL}
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289 static struct MemoryWriteByte mz80_mem_write[]=
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291 {0x0000,0xffff,mz80_write},
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292 {(UINT32) -1,(UINT32) -1,NULL}
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294 static struct z80PortRead mz80_io_read[] ={
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295 {(UINT16) -1,(UINT16) -1,NULL}
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297 static struct z80PortWrite mz80_io_write[]={
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298 {(UINT16) -1,(UINT16) -1,NULL}
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301 #elif defined(_USE_DRZ80)
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303 static struct DrZ80 drZ80;
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305 static unsigned int DrZ80_rebasePC(unsigned short a)
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307 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
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308 return drZ80.Z80PC_BASE + a;
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311 static unsigned int DrZ80_rebaseSP(unsigned short a)
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313 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
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314 return drZ80.Z80SP_BASE + a;
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317 static unsigned char DrZ80_in(unsigned short p)
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319 elprintf(EL_ANOMALY, "Z80 port %04x read", p);
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323 static void DrZ80_out(unsigned short p,unsigned char d)
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325 elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);
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328 static void DrZ80_irq_callback()
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330 drZ80.Z80_IRQ = 0; // lower irq when accepted
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335 // z80 functionality wrappers
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336 PICO_INTERNAL void z80_init(void)
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338 #if defined(_USE_MZ80)
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339 struct mz80context z80;
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343 // Modify the default context
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344 mz80GetContext(&z80);
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346 // point mz80 stuff
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347 z80.z80Base=Pico.zram;
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348 z80.z80MemRead=mz80_mem_read;
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349 z80.z80MemWrite=mz80_mem_write;
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350 z80.z80IoRead=mz80_io_read;
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351 z80.z80IoWrite=mz80_io_write;
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353 mz80SetContext(&z80);
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355 #elif defined(_USE_DRZ80)
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357 memset(&drZ80, 0, sizeof(struct DrZ80));
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358 drZ80.z80_rebasePC=DrZ80_rebasePC;
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359 drZ80.z80_rebaseSP=DrZ80_rebaseSP;
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360 drZ80.z80_read8 =z80_read;
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361 drZ80.z80_read16 =z80_read16;
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362 drZ80.z80_write8 =z80_write;
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363 drZ80.z80_write16 =z80_write16;
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364 drZ80.z80_in =DrZ80_in;
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365 drZ80.z80_out =DrZ80_out;
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366 drZ80.z80_irq_callback=DrZ80_irq_callback;
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370 PICO_INTERNAL void z80_reset(void)
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372 #if defined(_USE_MZ80)
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374 #elif defined(_USE_DRZ80)
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375 memset(&drZ80, 0, 0x54);
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376 drZ80.Z80F = (1<<2); // set ZFlag
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377 drZ80.Z80F2 = (1<<2); // set ZFlag
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378 drZ80.Z80IX = 0xFFFF << 16;
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379 drZ80.Z80IY = 0xFFFF << 16;
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380 drZ80.Z80IM = 0; // 1?
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381 drZ80.Z80PC = drZ80.z80_rebasePC(0);
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382 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
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384 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
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387 PICO_INTERNAL void z80_resetCycles(void)
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389 #if defined(_USE_MZ80)
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390 mz80GetElapsedTicks(1);
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394 PICO_INTERNAL void z80_int(void)
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396 #if defined(_USE_MZ80)
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398 #elif defined(_USE_DRZ80)
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399 drZ80.z80irqvector = 0xFF; // default IRQ vector RST opcode
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404 // returns number of cycles actually executed
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405 PICO_INTERNAL int z80_run(int cycles)
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407 #if defined(_USE_MZ80)
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408 int ticks_pre = mz80GetElapsedTicks(0);
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410 return mz80GetElapsedTicks(0) - ticks_pre;
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411 #elif defined(_USE_DRZ80)
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412 return cycles - DrZ80Run(&drZ80, cycles);
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418 PICO_INTERNAL void z80_pack(unsigned char *data)
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420 #if defined(_USE_MZ80)
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421 struct mz80context mz80;
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422 *(int *)data = 0x00005A6D; // "mZ"
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423 mz80GetContext(&mz80);
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424 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
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425 #elif defined(_USE_DRZ80)
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426 *(int *)data = 0x015A7244; // "DrZ" v1
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427 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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428 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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429 memcpy(data+4, &drZ80, 0x54);
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433 PICO_INTERNAL void z80_unpack(unsigned char *data)
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435 #if defined(_USE_MZ80)
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436 if(*(int *)data == 0x00005A6D) { // "mZ" save?
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437 struct mz80context mz80;
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438 mz80GetContext(&mz80);
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439 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
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440 mz80SetContext(&mz80);
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445 #elif defined(_USE_DRZ80)
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446 if(*(int *)data == 0x015A7244) { // "DrZ" v1 save?
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447 memcpy(&drZ80, data+4, 0x54);
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449 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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450 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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454 z80_int(); // try to goto int handler, maybe we won't execute trash there?
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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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