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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13 #include "../pico_int.h"
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14 #include "../cd/pcm.h"
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17 void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;
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19 // master int buffer to mix to
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20 static int PsndBuffer[2*44100/50];
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23 static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
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25 // cdda output buffer
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26 short cdda_out_buffer[2*1152];
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30 int PsndLen=0; // number of mono samples, multiply by 2 for stereo
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31 int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
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32 int PsndLen_exc_cnt=0;
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34 short *PsndOut=NULL; // PCM data buffer
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37 int timer_a_next_oflow, timer_a_step; // in z80 cycles
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38 int timer_b_next_oflow, timer_b_step;
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41 extern int *sn76496_regs;
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44 static void dac_recalculate(void)
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46 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
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48 if (PsndLen <= lines)
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55 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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73 for(i = 225; i != 224; i++)
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75 if (i >= lines) i = 0;
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77 while(dac_cnt >= 0) {
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81 if (i == mid) // midpoint
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82 while(pos+len < PsndLen/2) {
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87 dac_info[i] = (pos<<4)|len;
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91 for(len = 0, i = pos; i < PsndLen; i++) len++;
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92 if (PsndLen_exc_add) len++;
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93 dac_info[224] = (pos<<4)|len;
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95 mid = (dac_info[lines-1] & 0xfff0) + ((dac_info[lines-1] & 0xf) << 4);
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96 for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)
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98 //for(i=len=0; i < lines; i++) {
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99 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
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100 // len+=dac_info[i]&0xf;
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102 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));
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103 //printf("len total: %i, last pos: %i\n", len, pos);
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108 PICO_INTERNAL void PsndReset(void)
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112 // also clear the internal registers+addr line
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113 ym2612_regs = YM2612GetRegs();
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114 memset(ym2612_regs, 0, 0x200+4);
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121 // to be called after changing sound rate or chips
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122 void PsndRerate(int preserve_state)
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124 void *state = NULL;
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125 int target_fps = Pico.m.pal ? 50 : 60;
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127 // not all rates are supported in MCD mode due to mp3 decoder limitations
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128 if (PicoAHW & PAHW_MCD) {
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129 if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;
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130 PicoOpt |= POPT_EN_STEREO; // force stereo
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133 if (preserve_state) {
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134 state = malloc(0x200);
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135 if (state == NULL) return;
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136 memcpy(state, YM2612GetRegs(), 0x200);
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138 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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139 if (preserve_state) {
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140 // feed it back it's own registers, just like after loading state
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141 memcpy(YM2612GetRegs(), state, 0x200);
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142 ym2612_unpack_state();
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143 if ((PicoAHW & PAHW_MCD) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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147 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
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148 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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149 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
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154 // calculate PsndLen
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155 PsndLen=PsndRate / target_fps;
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156 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
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159 // recalculate dac info
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162 if (PicoAHW & PAHW_MCD)
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163 pcm_set_rate(PsndRate);
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165 // clear all buffers
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166 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
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167 memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));
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172 PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;
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174 if (PicoAHW & PAHW_PICO)
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179 PICO_INTERNAL void PsndDoDAC(int line_to)
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181 int pos, pos1, len;
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182 int dout = ym2612.dacout;
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183 int line_from = PsndDacLine;
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185 PsndDacLine = line_to + 1;
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187 pos =dac_info[line_from]>>4;
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188 pos1=dac_info[line_to];
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189 len = ((pos1>>4)-pos) + (pos1&0xf);
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192 if (PicoOpt & POPT_EN_STEREO) {
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193 short *d = PsndOut + pos*2;
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194 for (; len > 0; len--, d+=2) *d = dout;
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196 short *d = PsndOut + pos;
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197 for (; len > 0; len--, d++) *d = dout;
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202 int *d = PsndBuffer;
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203 d += (PicoOpt&8) ? pos*2 : pos;
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204 pcm_update(d, len, 1);
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210 static pm_file *cdda_stream = NULL;
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212 static void cdda_raw_update(int *buffer, int length)
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214 int ret, cdda_bytes;
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215 if (cdda_stream == NULL) return;
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217 cdda_bytes = length*4;
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218 if (PsndRate <= 22050) cdda_bytes *= 2;
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219 if (PsndRate < 22050) cdda_bytes *= 2;
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221 ret = pm_read(cdda_out_buffer, cdda_bytes, cdda_stream);
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222 if (ret < cdda_bytes) {
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223 memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);
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224 cdda_stream = NULL;
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229 switch (PsndRate) {
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230 case 44100: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;
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231 case 22050: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;
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232 case 11025: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;
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236 PICO_INTERNAL void cdda_start_play(void)
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238 int lba_offset, index, lba_length, i;
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240 elprintf(EL_STATUS, "cdda play track #%i", Pico_mcd->scd.Cur_Track);
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242 index = Pico_mcd->scd.Cur_Track - 1;
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244 lba_offset = Pico_mcd->scd.Cur_LBA - Track_to_LBA(index + 1);
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245 if (lba_offset < 0) lba_offset = 0;
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246 lba_offset += Pico_mcd->TOC.Tracks[index].Offset;
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248 // find the actual file for this track
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249 for (i = index; i >= 0; i--)
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250 if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
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252 if (Pico_mcd->TOC.Tracks[i].F == NULL) {
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253 elprintf(EL_STATUS|EL_ANOMALY, "no track?!");
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257 if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_MP3)
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261 lba_length = Pico_mcd->TOC.Tracks[i].Length;
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262 for (i++; i < Pico_mcd->TOC.Last_Track; i++) {
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263 if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
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264 lba_length += Pico_mcd->TOC.Tracks[i].Length;
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268 pos1024 = lba_offset * 1024 / lba_length;
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270 mp3_start_play(Pico_mcd->TOC.Tracks[index].F, pos1024);
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274 cdda_stream = Pico_mcd->TOC.Tracks[i].F;
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275 PicoCDBufferFlush(); // buffering relies on fp not being touched
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276 pm_seek(cdda_stream, lba_offset * 2352, SEEK_SET);
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277 if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_WAV)
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279 // skip headers, assume it's 44kHz stereo uncompressed
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280 pm_seek(cdda_stream, 44, SEEK_CUR);
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285 PICO_INTERNAL void PsndClear(void)
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288 if (PsndLen_exc_add) len++;
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289 if (PicoOpt & POPT_EN_STEREO)
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290 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned
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292 short *out = PsndOut;
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293 if ((int)out & 2) { *out++ = 0; len--; }
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294 memset32((int *) out, 0, len/2);
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295 if (len & 1) out[len-1] = 0;
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300 static int PsndRender(int offset, int length)
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302 int buf32_updated = 0;
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303 int *buf32 = PsndBuffer+offset;
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304 int stereo = (PicoOpt & 8) >> 3;
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305 // emulating CD && PCM option enabled && PCM chip on && have enabled channels
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306 int do_pcm = (PicoAHW & PAHW_MCD) && (PicoOpt&POPT_EN_MCD_PCM) &&
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307 (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;
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310 #if !SIMPLE_WRITE_SOUND
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311 if (offset == 0) { // should happen once per frame
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312 // compensate for float part of PsndLen
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313 PsndLen_exc_cnt += PsndLen_exc_add;
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314 if (PsndLen_exc_cnt >= 0x10000) {
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315 PsndLen_exc_cnt -= 0x10000;
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322 if (PicoOpt & POPT_EN_PSG)
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323 SN76496Update(PsndOut+offset, length, stereo);
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325 if (PicoAHW & PAHW_PICO) {
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326 PicoPicoPCMUpdate(PsndOut+offset, length, stereo);
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330 // Add in the stereo FM buffer
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331 if (PicoOpt & POPT_EN_FM) {
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332 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
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334 memset32(buf32, 0, length<<stereo);
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336 //printf("active_chs: %02x\n", buf32_updated);
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340 pcm_update(buf32, length, stereo);
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341 //buf32_updated = 1;
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345 // CD mode, cdda enabled, not data track, CDC is reading
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346 if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA) &&
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347 !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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349 // note: only 44, 22 and 11 kHz supported, with forced stereo
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350 int index = Pico_mcd->scd.Cur_Track - 1;
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352 if (Pico_mcd->TOC.Tracks[index].ftype == TYPE_MP3)
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353 mp3_update(buf32, length, stereo);
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355 cdda_raw_update(buf32, length);
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358 // convert + limit to normal 16bit output
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359 PsndMix_32_to_16l(PsndOut+offset, buf32, length);
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364 // to be called on 224 or line_sample scanlines only
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365 PICO_INTERNAL void PsndGetSamples(int y)
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367 #if SIMPLE_WRITE_SOUND
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368 if (y != 224) return;
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369 PsndRender(0, PsndLen);
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370 if (PicoWriteSound) PicoWriteSound(PsndLen);
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373 static int curr_pos = 0;
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378 curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);
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379 else curr_pos = PsndRender(0, PsndLen);
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380 if (emustatus&1) emustatus|=2; else emustatus&=~2;
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381 if (PicoWriteSound) PicoWriteSound(curr_pos);
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382 // clear sound buffer
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385 else if (emustatus & 3) {
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388 curr_pos = PsndRender(0, PsndLen/2);
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394 // -----------------------------------------------------------------
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399 // memhandlers for mz80 core
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400 unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
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401 void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
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403 // structures for mz80 core
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404 static struct MemoryReadByte mz80_mem_read[]=
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406 {0x0000,0xffff,mz80_read},
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407 {(UINT32) -1,(UINT32) -1,NULL}
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409 static struct MemoryWriteByte mz80_mem_write[]=
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411 {0x0000,0xffff,mz80_write},
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412 {(UINT32) -1,(UINT32) -1,NULL}
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414 static struct z80PortRead mz80_io_read[] ={
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415 {(UINT16) -1,(UINT16) -1,NULL}
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417 static struct z80PortWrite mz80_io_write[]={
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418 {(UINT16) -1,(UINT16) -1,NULL}
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421 int mz80_run(int cycles)
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423 int ticks_pre = mz80GetElapsedTicks(0);
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425 return mz80GetElapsedTicks(0) - ticks_pre;
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432 struct DrZ80 drZ80;
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434 static unsigned int DrZ80_rebasePC(unsigned short a)
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436 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
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437 return drZ80.Z80PC_BASE + a;
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440 static unsigned int DrZ80_rebaseSP(unsigned short a)
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442 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
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443 return drZ80.Z80SP_BASE + a;
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447 #if defined(_USE_DRZ80) || defined(_USE_CZ80)
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448 static unsigned char z80_in(unsigned short p)
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450 elprintf(EL_ANOMALY, "Z80 port %04x read", p);
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454 static void z80_out(unsigned short p,unsigned char d)
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456 elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);
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461 // z80 functionality wrappers
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462 PICO_INTERNAL void z80_init(void)
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465 struct mz80context z80;
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469 // Modify the default context
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470 mz80GetContext(&z80);
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472 // point mz80 stuff
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473 z80.z80Base=Pico.zram;
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474 z80.z80MemRead=mz80_mem_read;
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475 z80.z80MemWrite=mz80_mem_write;
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476 z80.z80IoRead=mz80_io_read;
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477 z80.z80IoWrite=mz80_io_write;
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479 mz80SetContext(&z80);
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482 memset(&drZ80, 0, sizeof(struct DrZ80));
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483 drZ80.z80_rebasePC=DrZ80_rebasePC;
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484 drZ80.z80_rebaseSP=DrZ80_rebaseSP;
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485 drZ80.z80_read8 =z80_read;
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486 drZ80.z80_read16 =NULL;
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487 drZ80.z80_write8 =z80_write;
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488 drZ80.z80_write16 =NULL;
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489 drZ80.z80_in =z80_in;
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490 drZ80.z80_out =z80_out;
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491 drZ80.z80_irq_callback=NULL;
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494 memset(&CZ80, 0, sizeof(CZ80));
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496 Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM
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497 Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror
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498 Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)
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499 Cz80_Set_WriteB(&CZ80, z80_write);
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500 Cz80_Set_INPort(&CZ80, z80_in);
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501 Cz80_Set_OUTPort(&CZ80, z80_out);
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505 PICO_INTERNAL void z80_reset(void)
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511 memset(&drZ80, 0, 0x54);
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512 drZ80.Z80F = (1<<2); // set ZFlag
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513 drZ80.Z80F2 = (1<<2); // set ZFlag
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514 drZ80.Z80IX = 0xFFFF << 16;
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515 drZ80.Z80IY = 0xFFFF << 16;
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516 drZ80.Z80IM = 0; // 1?
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517 drZ80.z80irqvector = 0xff0000; // RST 38h
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518 drZ80.Z80PC = drZ80.z80_rebasePC(0);
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519 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
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523 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
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524 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
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525 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
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527 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
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531 static int had_irq = 0, z80_ppc, z80_ops_done = 0;
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532 int z80_cycles_left = 0;
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539 static void xfail(void)
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541 printf("PC: %04x, %04x\n", Cz80_Get_Reg(&CZ80, CZ80_PC), z80_ppc);
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542 printf("z80_ops_done done: %i\n", z80_ops_done);
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546 int z80_run(int cycles)
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551 z80_cycles_left = cycles;
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552 z80_ppc = Cz80_Get_Reg(&CZ80, CZ80_PC);
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555 printf("irq @ %04x\n", Cz80_Get_Reg(&CZ80, CZ80_PC));
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556 Cz80_Set_IRQ(&CZ80, 0, HOLD_LINE);
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561 while (z80_cycles_left > 0)
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563 ccz = Cz80_Exec(&CZ80, 1);
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564 cdrz = 1 - DrZ80Run(&drZ80, 1);
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566 if (drZ80.Z80_IRQ && (drZ80.Z80IF&1))
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567 cdrz += 1 - DrZ80Run(&drZ80, 1); // cz80 processes IRQ after EI, DrZ80 does not
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570 printf("cycles: %i vs %i\n", cdrz, ccz);
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574 if (drZ80.Z80PC - drZ80.Z80PC_BASE != Cz80_Get_Reg(&CZ80, CZ80_PC)) {
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575 printf("PC: %04x vs %04x\n", drZ80.Z80PC - drZ80.Z80PC_BASE, Cz80_Get_Reg(&CZ80, CZ80_PC));
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582 z80_cycles_left -= ccz;
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583 z80_ppc = Cz80_Get_Reg(&CZ80, CZ80_PC);
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586 return co - z80_cycles_left;
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591 PICO_INTERNAL void z80_pack(unsigned char *data)
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593 #if defined(_USE_MZ80)
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594 struct mz80context mz80;
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595 *(int *)data = 0x00005A6D; // "mZ"
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596 mz80GetContext(&mz80);
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597 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
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598 #elif defined(_USE_DRZ80)
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599 *(int *)data = 0x015A7244; // "DrZ" v1
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600 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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601 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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602 memcpy(data+4, &drZ80, 0x54);
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603 #elif defined(_USE_CZ80)
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604 *(int *)data = 0x00007a43; // "Cz"
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605 *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
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606 memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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610 PICO_INTERNAL void z80_unpack(unsigned char *data)
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612 #if defined(_USE_MZ80)
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613 if (*(int *)data == 0x00005A6D) { // "mZ" save?
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614 struct mz80context mz80;
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615 mz80GetContext(&mz80);
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616 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
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617 mz80SetContext(&mz80);
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622 #elif defined(_USE_DRZ80)
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623 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
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624 memcpy(&drZ80, data+4, 0x54);
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626 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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627 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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631 z80_int(); // try to goto int handler, maybe we won't execute trash there?
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633 #elif defined(_USE_CZ80)
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634 if (*(int *)data == 0x00007a43) { // "Cz" save?
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635 memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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636 Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
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644 PICO_INTERNAL void z80_exit(void)
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646 #if defined(_USE_MZ80)
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651 #if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)
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652 PICO_INTERNAL void z80_debug(char *dstr)
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654 #if defined(_USE_DRZ80)
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655 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
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656 #elif defined(_USE_CZ80)
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657 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);
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