d9fc2fe1 |
1 | // PicoDrive\r |
cc68a136 |
2 | \r |
3 | // (c) Copyright 2004 Dave, All rights reserved.\r |
d9fc2fe1 |
4 | // (c) Copyright 2006-2008 notaz, All rights reserved.\r |
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5 | // Free for non-commercial use.\r |
6 | \r |
7 | // For commercial use, separate licencing terms must be obtained.\r |
8 | \r |
9 | \r |
efcba75f |
10 | #include "pico_int.h"\r |
cc68a136 |
11 | #include "sound/ym2612.h"\r |
12 | \r |
69996cb7 |
13 | int PicoVer=0x0133;\r |
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14 | struct Pico Pico;\r |
602133e1 |
15 | int PicoOpt = 0;\r |
16 | int PicoSkipFrame = 0; // skip rendering frame?\r |
17 | int emustatus = 0; // rapid_ym2612, multi_ym_updates\r |
2b02d6e5 |
18 | int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU\r |
5f9a0d16 |
19 | int PicoPadInt[2]; // internal copy\r |
9037e45d |
20 | int PicoAHW = 0; // active addon hardware: scd_active, 32x_active, svp_active, pico_active\r |
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21 | int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe\r |
51a902ae |
22 | int PicoAutoRgnOrder = 0;\r |
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23 | struct PicoSRAM SRam = {0,};\r |
24 | \r |
f8ef8ff7 |
25 | void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware\r |
26 | void (*PicoResetHook)(void) = NULL;\r |
b0677887 |
27 | void (*PicoLineHook)(void) = NULL;\r |
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28 | \r |
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29 | // to be called once on emu init\r |
2aa27095 |
30 | void PicoInit(void)\r |
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31 | {\r |
32 | // Blank space for state:\r |
33 | memset(&Pico,0,sizeof(Pico));\r |
34 | memset(&PicoPad,0,sizeof(PicoPad));\r |
5f9a0d16 |
35 | memset(&PicoPadInt,0,sizeof(PicoPadInt));\r |
cc68a136 |
36 | \r |
37 | // Init CPUs:\r |
38 | SekInit();\r |
39 | z80_init(); // init even if we aren't going to use it\r |
40 | \r |
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41 | PicoInitMCD();\r |
e807ac75 |
42 | PicoSVPInit();\r |
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43 | }\r |
44 | \r |
45 | // to be called once on emu exit\r |
46 | void PicoExit(void)\r |
47 | {\r |
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48 | if (PicoAHW & PAHW_MCD)\r |
4f265db7 |
49 | PicoExitMCD();\r |
ca482e5d |
50 | PicoCartUnload();\r |
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51 | z80_exit();\r |
52 | \r |
45f2f245 |
53 | if (SRam.data)\r |
54 | free(SRam.data);\r |
cc68a136 |
55 | }\r |
56 | \r |
1cb1584b |
57 | void PicoPower(void)\r |
58 | {\r |
053fd9b4 |
59 | Pico.m.frame_count = 0;\r |
60 | \r |
1cb1584b |
61 | // clear all memory of the emulated machine\r |
62 | memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);\r |
63 | \r |
64 | memset(&Pico.video,0,sizeof(Pico.video));\r |
65 | memset(&Pico.m,0,sizeof(Pico.m));\r |
66 | \r |
67 | Pico.video.pending_ints=0;\r |
68 | z80_reset();\r |
69 | \r |
70 | // default VDP register values (based on Fusion)\r |
71 | Pico.video.reg[0] = Pico.video.reg[1] = 0x04;\r |
72 | Pico.video.reg[0xc] = 0x81;\r |
73 | Pico.video.reg[0xf] = 0x02;\r |
74 | \r |
602133e1 |
75 | if (PicoAHW & PAHW_MCD)\r |
1cb1584b |
76 | PicoPowerMCD();\r |
77 | \r |
78 | PicoReset();\r |
79 | }\r |
80 | \r |
1e6b5e39 |
81 | PICO_INTERNAL void PicoDetectRegion(void)\r |
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82 | {\r |
1e6b5e39 |
83 | int support=0, hw=0, i;\r |
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84 | unsigned char pal=0;\r |
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85 | \r |
1e6b5e39 |
86 | if (PicoRegionOverride)\r |
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87 | {\r |
88 | support = PicoRegionOverride;\r |
89 | }\r |
90 | else\r |
91 | {\r |
92 | // Read cartridge region data:\r |
af37bca8 |
93 | unsigned short *rd = (unsigned short *)(Pico.rom + 0x1f0);\r |
94 | int region = (rd[0] << 16) | rd[1];\r |
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95 | \r |
af37bca8 |
96 | for (i = 0; i < 4; i++)\r |
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97 | {\r |
af37bca8 |
98 | int c;\r |
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99 | \r |
af37bca8 |
100 | c = region >> (i<<3);\r |
101 | c &= 0xff;\r |
102 | if (c <= ' ') continue;\r |
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103 | \r |
51a902ae |
104 | if (c=='J') support|=1;\r |
105 | else if (c=='U') support|=4;\r |
106 | else if (c=='E') support|=8;\r |
107 | else if (c=='j') {support|=1; break; }\r |
108 | else if (c=='u') {support|=4; break; }\r |
109 | else if (c=='e') {support|=8; break; }\r |
cc68a136 |
110 | else\r |
111 | {\r |
112 | // New style code:\r |
113 | char s[2]={0,0};\r |
114 | s[0]=(char)c;\r |
115 | support|=strtol(s,NULL,16);\r |
116 | }\r |
117 | }\r |
118 | }\r |
119 | \r |
51a902ae |
120 | // auto detection order override\r |
121 | if (PicoAutoRgnOrder) {\r |
122 | if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;\r |
123 | else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;\r |
124 | else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;\r |
125 | }\r |
126 | \r |
cc68a136 |
127 | // Try to pick the best hardware value for English/50hz:\r |
128 | if (support&8) { hw=0xc0; pal=1; } // Europe\r |
129 | else if (support&4) hw=0x80; // USA\r |
130 | else if (support&2) { hw=0x40; pal=1; } // Japan PAL\r |
131 | else if (support&1) hw=0x00; // Japan NTSC\r |
132 | else hw=0x80; // USA\r |
133 | \r |
134 | Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached\r |
135 | Pico.m.pal=pal;\r |
1e6b5e39 |
136 | }\r |
137 | \r |
138 | int PicoReset(void)\r |
139 | {\r |
2ec9bec5 |
140 | if (Pico.romsize <= 0)\r |
141 | return 1;\r |
1e6b5e39 |
142 | \r |
143 | /* must call now, so that banking is reset, and correct vectors get fetched */\r |
2ec9bec5 |
144 | if (PicoResetHook)\r |
145 | PicoResetHook();\r |
1e6b5e39 |
146 | \r |
5f9a0d16 |
147 | memset(&PicoPadInt,0,sizeof(PicoPadInt));\r |
2ec9bec5 |
148 | emustatus = 0;\r |
149 | \r |
150 | if (PicoAHW & PAHW_SMS) {\r |
151 | PicoResetMS();\r |
152 | return 0;\r |
153 | }\r |
154 | \r |
155 | SekReset();\r |
1e6b5e39 |
156 | // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).\r |
157 | SekSetRealTAS(PicoAHW & PAHW_MCD);\r |
158 | SekCycleCntT=0;\r |
159 | \r |
160 | if (PicoAHW & PAHW_MCD)\r |
161 | // needed for MCD to reset properly, probably some bug hides behind this..\r |
162 | memset(Pico.ioports,0,sizeof(Pico.ioports));\r |
1e6b5e39 |
163 | \r |
164 | Pico.m.dirtyPal = 1;\r |
165 | \r |
1832075e |
166 | Pico.m.z80_bank68k = 0;\r |
af37bca8 |
167 | Pico.m.z80_reset = 1;\r |
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168 | memset(Pico.zram, 0, sizeof(Pico.zram)); // ??\r |
169 | \r |
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170 | PicoDetectRegion();\r |
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171 | Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal\r |
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172 | \r |
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173 | PsndReset(); // pal must be known here\r |
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174 | \r |
1cb1584b |
175 | // create an empty "dma" to cause 68k exec start at random frame location\r |
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176 | if (Pico.m.dma_xfers == 0 && !(PicoOpt & POPT_DIS_VDP_FIFO))\r |
1cb1584b |
177 | Pico.m.dma_xfers = rand() & 0x1fff;\r |
178 | \r |
5ed2a20e |
179 | SekFinishIdleDet();\r |
180 | \r |
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181 | if (PicoAHW & PAHW_MCD) {\r |
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182 | PicoResetMCD();\r |
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183 | return 0;\r |
184 | }\r |
5ed2a20e |
185 | \r |
186 | // reinit, so that checksum checks pass\r |
187 | if (!(PicoOpt & POPT_DIS_IDLE_DET))\r |
188 | SekInitIdleDet();\r |
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189 | \r |
1dceadae |
190 | // reset sram state; enable sram access by default if it doesn't overlap with ROM\r |
45f2f245 |
191 | Pico.m.sram_reg = 0;\r |
192 | if ((SRam.flags & SRF_EEPROM) || Pico.romsize <= SRam.start)\r |
193 | Pico.m.sram_reg |= SRR_MAPPED;\r |
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194 | \r |
45f2f245 |
195 | if (SRam.flags & SRF_ENABLED)\r |
196 | elprintf(EL_STATUS, "sram: %06x - %06x; eeprom: %i", SRam.start, SRam.end,\r |
197 | !!(SRam.flags & SRF_EEPROM));\r |
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198 | \r |
199 | return 0;\r |
200 | }\r |
201 | \r |
1dceadae |
202 | \r |
69996cb7 |
203 | // dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)\r |
204 | // same for Outrunners (92-121, when active is set to 24)\r |
48df6e9e |
205 | // 96 is VR hack\r |
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206 | static const int dma_timings[] = {\r |
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207 | 96, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy\r |
208 | 102, 205, 204, 102, // vblank: 40cell:\r |
209 | 16, 16, 15, 8, // active: 32cell:\r |
210 | 24, 18, 17, 9 // ...\r |
4f672280 |
211 | };\r |
212 | \r |
69996cb7 |
213 | static const int dma_bsycles[] = {\r |
053fd9b4 |
214 | (488<<8)/96, (488<<8)/167, (488<<8)/166, (488<<8)/83,\r |
215 | (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,\r |
216 | (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,\r |
217 | (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9\r |
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218 | };\r |
219 | \r |
eff55556 |
220 | PICO_INTERNAL int CheckDMA(void)\r |
4f672280 |
221 | {\r |
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222 | int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes\r |
223 | int xfers = Pico.m.dma_xfers;\r |
312e9ce1 |
224 | int dma_op1;\r |
4f672280 |
225 | \r |
312e9ce1 |
226 | if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens\r |
227 | dma_op1 = dma_op;\r |
228 | if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?\r |
229 | if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?\r |
69996cb7 |
230 | xfers_can = dma_timings[dma_op];\r |
9761a7d0 |
231 | if(xfers <= xfers_can)\r |
232 | {\r |
4f672280 |
233 | if(dma_op&2) Pico.video.status&=~2; // dma no longer busy\r |
234 | else {\r |
69996cb7 |
235 | burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..\r |
4f672280 |
236 | }\r |
69996cb7 |
237 | Pico.m.dma_xfers = 0;\r |
4f672280 |
238 | } else {\r |
239 | if(!(dma_op&2)) burn = 488;\r |
69996cb7 |
240 | Pico.m.dma_xfers -= xfers_can;\r |
4f672280 |
241 | }\r |
242 | \r |
69996cb7 |
243 | elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());\r |
312e9ce1 |
244 | //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);\r |
245 | return burn;\r |
4f672280 |
246 | }\r |
247 | \r |
bf5fbbb4 |
248 | static __inline void SekRunM68k(int cyc)\r |
cc68a136 |
249 | {\r |
250 | int cyc_do;\r |
251 | SekCycleAim+=cyc;\r |
053fd9b4 |
252 | if ((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;\r |
03e4f2a3 |
253 | #if defined(EMU_CORE_DEBUG)\r |
254 | // this means we do run-compare\r |
b5e5172d |
255 | SekCycleCnt+=CM_compareRun(cyc_do, 0);\r |
cc68a136 |
256 | #elif defined(EMU_C68K)\r |
3aa1e148 |
257 | PicoCpuCM68k.cycles=cyc_do;\r |
258 | CycloneRun(&PicoCpuCM68k);\r |
259 | SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;\r |
cc68a136 |
260 | #elif defined(EMU_M68K)\r |
261 | SekCycleCnt+=m68k_execute(cyc_do);\r |
70357ce5 |
262 | #elif defined(EMU_F68K)\r |
c060a9ab |
263 | SekCycleCnt+=fm68k_emulate(cyc_do+1, 0, 0);\r |
cc68a136 |
264 | #endif\r |
265 | }\r |
266 | \r |
efcba75f |
267 | #include "pico_cmn.c"\r |
4b9c5888 |
268 | \r |
269 | int z80stopCycle;\r |
270 | int z80_cycle_cnt; /* 'done' z80 cycles before z80_run() */\r |
271 | int z80_cycle_aim;\r |
272 | int z80_scanline;\r |
273 | int z80_scanline_cycles; /* cycles done until z80_scanline */\r |
274 | \r |
275 | /* sync z80 to 68k */\r |
276 | PICO_INTERNAL void PicoSyncZ80(int m68k_cycles_done)\r |
cc68a136 |
277 | {\r |
4b9c5888 |
278 | int cnt;\r |
279 | z80_cycle_aim = cycles_68k_to_z80(m68k_cycles_done);\r |
280 | cnt = z80_cycle_aim - z80_cycle_cnt;\r |
cc68a136 |
281 | \r |
e5fa9817 |
282 | elprintf(EL_BUSREQ, "z80 sync %i (%i|%i -> %i|%i)", cnt, z80_cycle_cnt, z80_cycle_cnt / 228,\r |
4b9c5888 |
283 | z80_cycle_aim, z80_cycle_aim / 228);\r |
284 | \r |
285 | if (cnt > 0)\r |
286 | z80_cycle_cnt += z80_run(cnt);\r |
cc68a136 |
287 | }\r |
288 | \r |
4b9c5888 |
289 | \r |
2aa27095 |
290 | void PicoFrame(void)\r |
cc68a136 |
291 | {\r |
8c1952f0 |
292 | Pico.m.frame_count++;\r |
293 | \r |
19954be1 |
294 | if (PicoAHW & PAHW_SMS) {\r |
295 | PicoFrameMS();\r |
2aa27095 |
296 | return;\r |
cc68a136 |
297 | }\r |
19954be1 |
298 | \r |
299 | if (PicoAHW & PAHW_MCD) {\r |
300 | PicoFrameMCD();\r |
3e49ffd0 |
301 | return;\r |
302 | }\r |
cc68a136 |
303 | \r |
cc68a136 |
304 | //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode\r |
305 | \r |
19954be1 |
306 | PicoFrameStart();\r |
2aa27095 |
307 | PicoFrameHints();\r |
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308 | }\r |
309 | \r |
a12e0116 |
310 | void PicoFrameDrawOnly(void)\r |
311 | {\r |
87b0845f |
312 | if (!(PicoAHW & PAHW_SMS)) {\r |
313 | PicoFrameStart();\r |
314 | PicoDrawSync(223, 0);\r |
315 | } else {\r |
316 | PicoFrameDrawOnlyMS();\r |
317 | }\r |
a12e0116 |
318 | }\r |
319 | \r |
4609d0cd |
320 | void PicoGetInternal(pint_t which, pint_ret_t *r)\r |
8e5427a0 |
321 | {\r |
322 | switch (which)\r |
323 | {\r |
4609d0cd |
324 | case PI_ROM: r->vptr = Pico.rom; break;\r |
325 | case PI_ISPAL: r->vint = Pico.m.pal; break;\r |
326 | case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break;\r |
327 | case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;\r |
8e5427a0 |
328 | }\r |
8e5427a0 |
329 | }\r |
330 | \r |
66fdc0f0 |
331 | // callback to output message from emu\r |
332 | void (*PicoMessage)(const char *msg)=NULL;\r |
cc68a136 |
333 | \r |