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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13 #include "sn76496.h"
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16 #pragma warning (disable:4244)
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19 #if defined(_USE_MZ80)
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20 #include "../../cpu/mz80/mz80.h"
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21 #elif defined(_USE_DRZ80)
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22 #include "../../cpu/DrZ80/drz80.h"
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25 #include "../PicoInt.h"
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28 //int z80CycleAim = 0;
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32 unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
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36 int PsndLen=0; // number of mono samples, multiply by 2 for stereo
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37 short *PsndOut=NULL; // PCM data buffer
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40 extern int *ym2612_dacen;
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41 extern INT32 *ym2612_dacout;
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42 void YM2612TimerHandler(int c,int cnt);
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45 extern int *sn76496_regs;
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48 static void dac_recalculate()
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50 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
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52 if(PsndLen <= lines) {
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54 dac_cnt = 0;//lines - PsndLen;
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58 for(i=226; i != 225; i++) {
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59 if (i >= lines) i = 0;
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67 dac_info[i] = (pos<<4)|len;
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71 dac_cnt = PsndLen/2;
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73 for(i = 225; i != 224; i++) {
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74 if (i >= lines) i = 0;
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76 while(dac_cnt >= 0) {
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80 if (i == mid) // midpoint
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81 while(pos+len < PsndLen/2) {
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86 dac_info[i] = (pos<<4)|len;
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90 for(len = 0, i = pos; i < PsndLen; i++) len++;
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91 dac_info[224] = (pos<<4)|len;
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93 // dprintf("rate is %i, len %i", PsndRate, PsndLen);
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94 // for(i=0; i < lines; i++)
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95 // dprintf("%03i : %03i : %i", i, dac_info[i]>>4, dac_info[i]&0xf);
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102 extern int z80stopCycle;
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105 // init even if we are not going to use them, just in case we ever enable it
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106 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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107 // also clear the internal registers+addr line
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108 ym2612_regs = YM2612GetRegs();
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109 memset(ym2612_regs, 0, 0x200+4);
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111 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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113 // calculate PsndLen
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114 PsndLen=PsndRate/(Pico.m.pal ? 50 : 60);
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116 // recalculate dac info
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122 // to be called after changing sound rate or chips
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123 void sound_rerate()
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125 unsigned int state[28];
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127 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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128 // feed it back it's own registers, just like after loading state
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129 YM2612PicoStateLoad();
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131 memcpy(state, sn76496_regs, 28*4); // remember old state
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132 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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133 memcpy(sn76496_regs, state, 28*4); // restore old state
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135 // calculate PsndLen
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136 PsndLen=PsndRate/(Pico.m.pal ? 50 : 60);
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138 // recalculate dac info
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143 // This is called once per raster (aka line), but not necessarily for every line
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144 int sound_timers_and_dac(int raster)
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146 if(raster >= 0 && PsndOut && (PicoOpt&1) && *ym2612_dacen) {
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147 short dout = (short) *ym2612_dacout;
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148 int pos=dac_info[raster], len=pos&0xf;
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152 if(PicoOpt&8) { // only left channel for stereo (will be copied to right by ym2612 mixing code)
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154 while(len--) { *d = dout; d += 2; }
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157 while(len--) *d++ = dout;
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161 //dprintf("s: %03i", raster);
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163 // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)
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170 int sound_render(int offset, int length)
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172 int stereo = (PicoOpt & 8) >> 3;
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177 SN76496Update(PsndOut+offset, length, stereo);
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179 // Add in the stereo FM buffer
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181 YM2612UpdateOne(PsndOut+offset, length, stereo);
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183 // YM2612 upmixes to stereo, so we have to do this manually here
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185 short *s = PsndOut+offset;
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186 for (i = 0; i < length; i++) {
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196 #if defined(_USE_MZ80)
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198 // memhandlers for mz80 core
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199 unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
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200 void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
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202 // structures for mz80 core
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203 static struct MemoryReadByte mz80_mem_read[]=
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205 {0x0000,0xffff,mz80_read},
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206 {(UINT32) -1,(UINT32) -1,NULL}
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208 static struct MemoryWriteByte mz80_mem_write[]=
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210 {0x0000,0xffff,mz80_write},
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211 {(UINT32) -1,(UINT32) -1,NULL}
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213 static struct z80PortRead mz80_io_read[] ={
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214 {(UINT16) -1,(UINT16) -1,NULL}
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216 static struct z80PortWrite mz80_io_write[]={
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217 {(UINT16) -1,(UINT16) -1,NULL}
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220 #elif defined(_USE_DRZ80)
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222 static struct DrZ80 drZ80;
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224 static unsigned int DrZ80_rebasePC(unsigned short a)
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226 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
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227 return drZ80.Z80PC_BASE + a;
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230 static unsigned int DrZ80_rebaseSP(unsigned short a)
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232 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
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233 return drZ80.Z80SP_BASE + a;
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236 static unsigned char DrZ80_in(unsigned short p)
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241 static void DrZ80_out(unsigned short p,unsigned char d)
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245 static void DrZ80_irq_callback()
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247 drZ80.Z80_IRQ = 0; // lower irq when accepted
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252 // z80 functionality wrappers
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255 #if defined(_USE_MZ80)
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256 struct mz80context z80;
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260 // Modify the default context
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261 mz80GetContext(&z80);
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263 // point mz80 stuff
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264 z80.z80Base=Pico.zram;
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265 z80.z80MemRead=mz80_mem_read;
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266 z80.z80MemWrite=mz80_mem_write;
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267 z80.z80IoRead=mz80_io_read;
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268 z80.z80IoWrite=mz80_io_write;
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270 mz80SetContext(&z80);
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272 #elif defined(_USE_DRZ80)
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274 memset(&drZ80, 0, sizeof(struct DrZ80));
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275 drZ80.z80_rebasePC=DrZ80_rebasePC;
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276 drZ80.z80_rebaseSP=DrZ80_rebaseSP;
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277 drZ80.z80_read8 =z80_read;
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278 drZ80.z80_read16 =z80_read16;
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279 drZ80.z80_write8 =z80_write;
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280 drZ80.z80_write16 =z80_write16;
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281 drZ80.z80_in =DrZ80_in;
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282 drZ80.z80_out =DrZ80_out;
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283 drZ80.z80_irq_callback=DrZ80_irq_callback;
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289 #if defined(_USE_MZ80)
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291 #elif defined(_USE_DRZ80)
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292 memset(&drZ80, 0, 0x54);
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293 drZ80.Z80F = (1<<2); // set ZFlag
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294 drZ80.Z80F2 = (1<<2); // set ZFlag
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295 drZ80.Z80IX = 0xFFFF << 16;
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296 drZ80.Z80IY = 0xFFFF << 16;
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297 drZ80.Z80IM = 0; // 1?
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298 drZ80.Z80PC = drZ80.z80_rebasePC(0);
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299 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
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301 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
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304 void z80_resetCycles()
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306 #if defined(_USE_MZ80)
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307 mz80GetElapsedTicks(1);
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313 #if defined(_USE_MZ80)
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315 #elif defined(_USE_DRZ80)
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316 drZ80.z80irqvector = 0xFF; // default IRQ vector RST opcode
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321 // returns number of cycles actually executed
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322 int z80_run(int cycles)
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324 #if defined(_USE_MZ80)
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325 int ticks_pre = mz80GetElapsedTicks(0);
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327 return mz80GetElapsedTicks(0) - ticks_pre;
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328 #elif defined(_USE_DRZ80)
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329 return cycles - DrZ80Run(&drZ80, cycles);
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335 void z80_pack(unsigned char *data)
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337 #if defined(_USE_MZ80)
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338 struct mz80context mz80;
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339 *(int *)data = 0x00005A6D; // "mZ"
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340 mz80GetContext(&mz80);
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341 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
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342 #elif defined(_USE_DRZ80)
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343 *(int *)data = 0x015A7244; // "DrZ" v1
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344 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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345 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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346 memcpy(data+4, &drZ80, 0x54);
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350 void z80_unpack(unsigned char *data)
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352 #if defined(_USE_MZ80)
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353 if(*(int *)data == 0x00005A6D) { // "mZ" save?
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354 struct mz80context mz80;
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355 mz80GetContext(&mz80);
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356 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
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357 mz80SetContext(&mz80);
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362 #elif defined(_USE_DRZ80)
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363 if(*(int *)data == 0x015A7244) { // "DrZ" v1 save?
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364 memcpy(&drZ80, data+4, 0x54);
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366 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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367 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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371 z80_int(); // try to goto int handler, maybe we won't execute trash there?
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378 #if defined(_USE_MZ80)
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383 #if defined(__DEBUG_PRINT) || defined(WIN32)
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384 void z80_debug(char *dstr)
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386 #if defined(_USE_DRZ80)
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387 sprintf(dstr, "%sZ80 state: PC: %04x SP: %04x\n", dstr, drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
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