3 * (c) Copyright Dave, 2004
\r
4 * (C) notaz, 2006-2010
\r
6 * This work is licensed under the terms of MAME license.
\r
7 * See COPYING file in the top-level directory.
\r
10 #include "pico_int.h"
\r
11 #include "sound/ym2612.h"
\r
15 int PicoSkipFrame; // skip rendering frame?
\r
16 int PicoPad[2]; // Joypads, format is MXYZ SACB RLDU
\r
17 int PicoPadInt[2]; // internal copy
\r
18 int PicoAHW; // active addon hardware: PAHW_*
\r
19 int PicoQuirks; // game-specific quirks
\r
20 int PicoRegionOverride; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe
\r
21 int PicoAutoRgnOrder;
\r
23 struct PicoSRAM SRam;
\r
24 int emustatus; // rapid_ym2612, multi_ym_updates
\r
25 int scanlines_total;
\r
27 void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware
\r
28 void (*PicoResetHook)(void) = NULL;
\r
29 void (*PicoLineHook)(void) = NULL;
\r
31 // to be called once on emu init
\r
34 // Blank space for state:
\r
35 memset(&Pico,0,sizeof(Pico));
\r
36 memset(&PicoPad,0,sizeof(PicoPad));
\r
37 memset(&PicoPadInt,0,sizeof(PicoPadInt));
\r
41 z80_init(); // init even if we aren't going to use it
\r
48 // to be called once on emu exit
\r
51 if (PicoAHW & PAHW_MCD)
\r
61 void PicoPower(void)
\r
63 Pico.m.frame_count = 0;
\r
64 SekCycleCnt = SekCycleAim = 0;
\r
66 // clear all memory of the emulated machine
\r
67 memset(&Pico.ram,0,(unsigned char *)&Pico.rom - Pico.ram);
\r
69 memset(&Pico.video,0,sizeof(Pico.video));
\r
70 memset(&Pico.m,0,sizeof(Pico.m));
\r
72 Pico.video.pending_ints=0;
\r
75 // my MD1 VA6 console has this in IO
\r
76 Pico.ioports[1] = Pico.ioports[2] = Pico.ioports[3] = 0xff;
\r
78 // default VDP register values (based on Fusion)
\r
79 Pico.video.reg[0] = Pico.video.reg[1] = 0x04;
\r
80 Pico.video.reg[0xc] = 0x81;
\r
81 Pico.video.reg[0xf] = 0x02;
\r
83 if (PicoAHW & PAHW_MCD)
\r
86 if (PicoOpt & POPT_EN_32X)
\r
92 PICO_INTERNAL void PicoDetectRegion(void)
\r
94 int support=0, hw=0, i;
\r
95 unsigned char pal=0;
\r
97 if (PicoRegionOverride)
\r
99 support = PicoRegionOverride;
\r
103 // Read cartridge region data:
\r
104 unsigned short *rd = (unsigned short *)(Pico.rom + 0x1f0);
\r
105 int region = (rd[0] << 16) | rd[1];
\r
107 for (i = 0; i < 4; i++)
\r
111 c = region >> (i<<3);
\r
113 if (c <= ' ') continue;
\r
115 if (c=='J') support|=1;
\r
116 else if (c=='U') support|=4;
\r
117 else if (c=='E') support|=8;
\r
118 else if (c=='j') {support|=1; break; }
\r
119 else if (c=='u') {support|=4; break; }
\r
120 else if (c=='e') {support|=8; break; }
\r
126 support|=strtol(s,NULL,16);
\r
131 // auto detection order override
\r
132 if (PicoAutoRgnOrder) {
\r
133 if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;
\r
134 else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;
\r
135 else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;
\r
138 // Try to pick the best hardware value for English/50hz:
\r
139 if (support&8) { hw=0xc0; pal=1; } // Europe
\r
140 else if (support&4) hw=0x80; // USA
\r
141 else if (support&2) { hw=0x40; pal=1; } // Japan PAL
\r
142 else if (support&1) hw=0x00; // Japan NTSC
\r
143 else hw=0x80; // USA
\r
145 Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached
\r
149 int PicoReset(void)
\r
151 if (Pico.romsize <= 0)
\r
154 #if defined(CPU_CMP_R) || defined(CPU_CMP_W) || defined(DRC_CMP)
\r
155 PicoOpt |= POPT_DIS_VDP_FIFO|POPT_DIS_IDLE_DET;
\r
158 /* must call now, so that banking is reset, and correct vectors get fetched */
\r
162 memset(&PicoPadInt,0,sizeof(PicoPadInt));
\r
165 if (PicoAHW & PAHW_SMS) {
\r
171 // ..but do not reset SekCycle* to not desync with addons
\r
173 // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).
\r
174 SekSetRealTAS(PicoAHW & PAHW_MCD);
\r
176 Pico.m.dirtyPal = 1;
\r
178 Pico.m.z80_bank68k = 0;
\r
179 Pico.m.z80_reset = 1;
\r
181 PicoDetectRegion();
\r
182 Pico.video.status = 0x3428 | Pico.m.pal; // 'always set' bits | vblank | collision | pal
\r
184 PsndReset(); // pal must be known here
\r
186 // create an empty "dma" to cause 68k exec start at random frame location
\r
187 if (Pico.m.dma_xfers == 0 && !(PicoOpt & POPT_DIS_VDP_FIFO))
\r
188 Pico.m.dma_xfers = rand() & 0x1fff;
\r
190 SekFinishIdleDet();
\r
192 if (PicoAHW & PAHW_MCD) {
\r
197 // reinit, so that checksum checks pass
\r
198 if (!(PicoOpt & POPT_DIS_IDLE_DET))
\r
201 if (PicoOpt & POPT_EN_32X)
\r
204 // reset sram state; enable sram access by default if it doesn't overlap with ROM
\r
205 Pico.m.sram_reg = 0;
\r
206 if ((SRam.flags & SRF_EEPROM) || Pico.romsize <= SRam.start)
\r
207 Pico.m.sram_reg |= SRR_MAPPED;
\r
209 if (SRam.flags & SRF_ENABLED)
\r
210 elprintf(EL_STATUS, "sram: %06x - %06x; eeprom: %i", SRam.start, SRam.end,
\r
211 !!(SRam.flags & SRF_EEPROM));
\r
216 // flush config changes before emu loop starts
\r
217 void PicoLoopPrepare(void)
\r
219 if (PicoRegionOverride)
\r
220 // force setting possibly changed..
\r
221 Pico.m.pal = (PicoRegionOverride == 2 || PicoRegionOverride == 8) ? 1 : 0;
\r
223 // FIXME: PAL has 313 scanlines..
\r
224 scanlines_total = Pico.m.pal ? 312 : 262;
\r
226 Pico.m.dirtyPal = 1;
\r
227 rendstatus_old = -1;
\r
231 // dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)
\r
232 // same for Outrunners (92-121, when active is set to 24)
\r
234 static const int dma_timings[] = {
\r
235 167, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
\r
236 102, 205, 204, 102, // vblank: 40cell:
\r
237 16, 16, 15, 8, // active: 32cell:
\r
238 24, 18, 17, 9 // ...
\r
241 static const int dma_bsycles[] = {
\r
242 (488<<8)/167, (488<<8)/167, (488<<8)/166, (488<<8)/83,
\r
243 (488<<8)/102, (488<<8)/233, (488<<8)/204, (488<<8)/102,
\r
244 (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,
\r
245 (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9
\r
248 // grossly inaccurate.. FIXME FIXXXMEE
\r
249 PICO_INTERNAL int CheckDMA(void)
\r
251 int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes
\r
252 int xfers = Pico.m.dma_xfers;
\r
255 if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens
\r
257 if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?
\r
258 if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?
\r
259 xfers_can = dma_timings[dma_op];
\r
260 if(xfers <= xfers_can)
\r
262 if(dma_op&2) Pico.video.status&=~2; // dma no longer busy
\r
264 burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..
\r
266 Pico.m.dma_xfers = 0;
\r
268 if(!(dma_op&2)) burn = 488;
\r
269 Pico.m.dma_xfers -= xfers_can;
\r
272 elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());
\r
273 //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);
\r
277 #include "pico_cmn.c"
\r
279 unsigned int last_z80_sync; /* in 68k cycles */
\r
283 int z80_scanline_cycles; /* cycles done until z80_scanline */
\r
285 /* sync z80 to 68k */
\r
286 PICO_INTERNAL void PicoSyncZ80(unsigned int m68k_cycles_done)
\r
291 m68k_cnt = m68k_cycles_done - last_z80_sync;
\r
292 z80_cycle_aim += cycles_68k_to_z80(m68k_cnt);
\r
293 cnt = z80_cycle_aim - z80_cycle_cnt;
\r
294 last_z80_sync = m68k_cycles_done;
\r
298 elprintf(EL_BUSREQ, "z80 sync %i (%u|%u -> %u|%u)", cnt,
\r
299 z80_cycle_cnt, z80_cycle_cnt / 288,
\r
300 z80_cycle_aim, z80_cycle_aim / 288);
\r
303 z80_cycle_cnt += z80_run(cnt);
\r
309 void PicoFrame(void)
\r
311 pprof_start(frame);
\r
313 Pico.m.frame_count++;
\r
315 if (PicoAHW & PAHW_SMS) {
\r
320 if (PicoAHW & PAHW_32X) {
\r
321 PicoFrame32x(); // also does MCD+32X
\r
325 if (PicoAHW & PAHW_MCD) {
\r
330 //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode
\r
339 void PicoFrameDrawOnly(void)
\r
341 if (!(PicoAHW & PAHW_SMS)) {
\r
343 PicoDrawSync(223, 0);
\r
345 PicoFrameDrawOnlyMS();
\r
349 void PicoGetInternal(pint_t which, pint_ret_t *r)
\r
353 case PI_ROM: r->vptr = Pico.rom; break;
\r
354 case PI_ISPAL: r->vint = Pico.m.pal; break;
\r
355 case PI_IS40_CELL: r->vint = Pico.video.reg[12]&1; break;
\r
356 case PI_IS240_LINES: r->vint = Pico.m.pal && (Pico.video.reg[1]&8); break;
\r
360 // callback to output message from emu
\r
361 void (*PicoMessage)(const char *msg)=NULL;
\r