| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 1998 BERO |
| 5 | * Copyright (C) 2002 Ben Parnell |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include "mapinc.h" |
| 23 | |
| 24 | #define MMC1_reg mapbyte1 |
| 25 | #define MMC1_buf mapbyte2[0] |
| 26 | #define MMC1_sft mapbyte3[0] |
| 27 | |
| 28 | static int mmc1opts; |
| 29 | |
| 30 | |
| 31 | uint8 MMC1WRAMsize; /* For use in iNES.c */ |
| 32 | |
| 33 | static DECLFW(MBWRAM) |
| 34 | { |
| 35 | if(!(MMC1_reg[3]&0x10)) |
| 36 | Page[A>>11][A]=V; // WRAM is enabled. |
| 37 | } |
| 38 | |
| 39 | static DECLFR(MAWRAM) |
| 40 | { |
| 41 | if(MMC1_reg[3]&0x10) |
| 42 | return X.DB; // WRAM is disabled |
| 43 | return(Page[A>>11][A]); |
| 44 | } |
| 45 | |
| 46 | static void MMC1CHR(void) |
| 47 | { |
| 48 | if(mmc1opts&4) |
| 49 | { |
| 50 | if(MMC1_reg[0]&0x10) |
| 51 | setprg8r(0x10,0x6000,(MMC1_reg[1]>>4)&1); |
| 52 | else |
| 53 | setprg8r(0x10,0x6000,(MMC1_reg[1]>>3)&1); |
| 54 | X6502_Rebase(); |
| 55 | } |
| 56 | |
| 57 | if(MMC1_reg[0]&0x10) |
| 58 | { |
| 59 | setchr4(0x0000,MMC1_reg[1]); |
| 60 | setchr4(0x1000,MMC1_reg[2]); |
| 61 | } |
| 62 | else |
| 63 | setchr8(MMC1_reg[1]>>1); |
| 64 | } |
| 65 | |
| 66 | static void MMC1PRG(void) |
| 67 | { |
| 68 | uint8 offs; |
| 69 | |
| 70 | offs=MMC1_reg[1]&0x10; |
| 71 | switch(MMC1_reg[0]&0xC) |
| 72 | { |
| 73 | case 0xC: setprg16(0x8000,(MMC1_reg[3]+offs)); |
| 74 | setprg16(0xC000,0xF+offs); |
| 75 | break; |
| 76 | case 0x8: setprg16(0xC000,(MMC1_reg[3]+offs)); |
| 77 | setprg16(0x8000,offs); |
| 78 | break; |
| 79 | case 0x0: |
| 80 | case 0x4: |
| 81 | setprg16(0x8000,((MMC1_reg[3]&~1)+offs)); |
| 82 | setprg16(0xc000,((MMC1_reg[3]&~1)+offs+1)); |
| 83 | break; |
| 84 | } |
| 85 | X6502_Rebase(); |
| 86 | } |
| 87 | static void MMC1MIRROR(void) |
| 88 | { |
| 89 | switch(MMC1_reg[0]&3) |
| 90 | { |
| 91 | case 2: setmirror(MI_V);break; |
| 92 | case 3: setmirror(MI_H);break; |
| 93 | case 0: setmirror(MI_0);break; |
| 94 | case 1: setmirror(MI_1);break; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | static uint64 lreset; |
| 99 | |
| 100 | static DECLFW(MMC1_write) |
| 101 | { |
| 102 | int n=(A>>13)-4; |
| 103 | //FCEU_DispMessage("%016x",timestampbase+timestamp); |
| 104 | //printf("$%04x:$%02x, $%04x\n",A,V,X.PC); |
| 105 | //DumpMem("out",0xe000,0xffff); |
| 106 | |
| 107 | /* The MMC1 is busy so ignore the write. */ |
| 108 | /* As of version FCE Ultra 0.81, the timestamp is only |
| 109 | increased before each instruction is executed(in other words |
| 110 | precision isn't that great), but this should still work to |
| 111 | deal with 2 writes in a row from a single RMW instruction. |
| 112 | */ |
| 113 | if( (timestampbase+timestamp)<(lreset+2)) |
| 114 | return; |
| 115 | if (V&0x80) |
| 116 | { |
| 117 | MMC1_reg[0]|=0xC; |
| 118 | MMC1_sft=MMC1_buf=0; |
| 119 | MMC1PRG(); |
| 120 | lreset=timestampbase+timestamp; |
| 121 | return; |
| 122 | } |
| 123 | |
| 124 | MMC1_buf|=(V&1)<<(MMC1_sft++); |
| 125 | |
| 126 | if (MMC1_sft==5) { |
| 127 | MMC1_reg[n]=MMC1_buf; |
| 128 | MMC1_sft = MMC1_buf=0; |
| 129 | |
| 130 | switch(n){ |
| 131 | case 0: |
| 132 | MMC1MIRROR(); |
| 133 | MMC1CHR(); |
| 134 | MMC1PRG(); |
| 135 | break; |
| 136 | case 1: |
| 137 | MMC1CHR(); |
| 138 | MMC1PRG(); |
| 139 | break; |
| 140 | case 2: |
| 141 | MMC1CHR(); |
| 142 | break; |
| 143 | case 3: |
| 144 | MMC1PRG(); |
| 145 | break; |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | static void MMC1_Restore(int version) |
| 151 | { |
| 152 | MMC1MIRROR(); |
| 153 | MMC1CHR(); |
| 154 | MMC1PRG(); |
| 155 | } |
| 156 | |
| 157 | static void MMC1CMReset(void) |
| 158 | { |
| 159 | int i; |
| 160 | |
| 161 | for(i=0;i<4;i++) |
| 162 | MMC1_reg[i]=0; |
| 163 | MMC1_sft = MMC1_buf =0; |
| 164 | MMC1_reg[0]=0x1F; |
| 165 | |
| 166 | MMC1_reg[1]=0; |
| 167 | MMC1_reg[2]=0; // Should this be something other than 0? |
| 168 | MMC1_reg[3]=0; |
| 169 | |
| 170 | MMC1MIRROR(); |
| 171 | MMC1CHR(); |
| 172 | MMC1PRG(); |
| 173 | } |
| 174 | |
| 175 | void DetectMMC1WRAMSize(void) |
| 176 | { |
| 177 | switch(iNESGameCRC32) |
| 178 | { |
| 179 | default:MMC1WRAMsize=1;break; |
| 180 | case 0xc6182024: /* Romance of the 3 Kingdoms */ |
| 181 | case 0x2225c20f: /* Genghis Khan */ |
| 182 | case 0x4642dda6: /* Nobunaga's Ambition */ |
| 183 | case 0x29449ba9: /* "" "" (J) */ |
| 184 | case 0x2b11e0b0: /* "" "" (J) */ |
| 185 | MMC1WRAMsize=2; |
| 186 | break; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | void Mapper1_init(void) |
| 191 | { |
| 192 | lreset=0; |
| 193 | mmc1opts=0; |
| 194 | MMC1CMReset(); |
| 195 | SetWriteHandler(0x8000,0xFFFF,MMC1_write); |
| 196 | MapStateRestore=MMC1_Restore; |
| 197 | AddExState(&lreset, 8, 1, "LRST"); |
| 198 | |
| 199 | if(!VROM_size) |
| 200 | SetupCartCHRMapping(0, CHRRAM, 8192, 1); |
| 201 | |
| 202 | if(MMC1WRAMsize==2) |
| 203 | mmc1opts|=4; |
| 204 | |
| 205 | SetupCartPRGMapping(0x10,WRAM,MMC1WRAMsize*8192,1); |
| 206 | SetReadHandler(0x6000,0x7FFF,MAWRAM); |
| 207 | SetWriteHandler(0x6000,0x7FFF,MBWRAM); |
| 208 | setprg8r(0x10,0x6000,0); |
| 209 | } |
| 210 | |
| 211 | static void GenMMC1Close(void) |
| 212 | { |
| 213 | UNIFOpenWRAM(UOW_WR,0,0); |
| 214 | UNIFWriteWRAM(WRAM+((mmc1opts&4)?8192:0),8192); |
| 215 | UNIFCloseWRAM(); |
| 216 | } |
| 217 | |
| 218 | |
| 219 | static void GenMMC1Power(void) |
| 220 | { |
| 221 | lreset=0; |
| 222 | if(mmc1opts&1) |
| 223 | { |
| 224 | FCEU_CheatAddRAM(8,0x6000,WRAM); |
| 225 | if(mmc1opts&4) |
| 226 | FCEU_dwmemset(WRAM,0,8192) |
| 227 | else if(!(mmc1opts&2)) |
| 228 | FCEU_dwmemset(WRAM,0,8192); |
| 229 | } |
| 230 | SetWriteHandler(0x8000,0xFFFF,MMC1_write); |
| 231 | SetReadHandler(0x8000,0xFFFF,CartBR); |
| 232 | |
| 233 | if(mmc1opts&1) |
| 234 | { |
| 235 | SetReadHandler(0x6000,0x7FFF,MAWRAM); |
| 236 | SetWriteHandler(0x6000,0x7FFF,MBWRAM); |
| 237 | setprg8r(0x10,0x6000,0); |
| 238 | } |
| 239 | |
| 240 | MMC1CMReset(); |
| 241 | } |
| 242 | |
| 243 | static void GenMMC1Init(int prg, int chr, int wram, int battery) |
| 244 | { |
| 245 | mmc1opts=0; |
| 246 | PRGmask16[0]&=(prg>>14)-1; |
| 247 | CHRmask4[0]&=(chr>>12)-1; |
| 248 | CHRmask8[0]&=(chr>>13)-1; |
| 249 | |
| 250 | if(wram) |
| 251 | { |
| 252 | mmc1opts|=1; |
| 253 | if(wram>8) mmc1opts|=4; |
| 254 | SetupCartPRGMapping(0x10,WRAM,wram*1024,1); |
| 255 | AddExState(WRAM, wram*1024, 0, "WRAM"); |
| 256 | } |
| 257 | |
| 258 | if(battery && UNIFbattery) |
| 259 | { |
| 260 | mmc1opts|=2; |
| 261 | BoardClose=GenMMC1Close; |
| 262 | |
| 263 | UNIFOpenWRAM(UOW_RD,0,0); |
| 264 | UNIFReadWRAM(WRAM+((mmc1opts&4)?8192:0),8192); |
| 265 | UNIFCloseWRAM(); |
| 266 | } |
| 267 | |
| 268 | if(!chr) |
| 269 | { |
| 270 | CHRmask4[0]=1; |
| 271 | SetupCartCHRMapping(0, CHRRAM, 8192, 1); |
| 272 | AddExState(CHRRAM, 8192, 0, "CHRR"); |
| 273 | } |
| 274 | AddExState(mapbyte1, 32, 0, "MPBY"); |
| 275 | BoardPower=GenMMC1Power; |
| 276 | |
| 277 | GameStateRestore=MMC1_Restore; |
| 278 | AddExState(&lreset, 8, 1, "LRST"); |
| 279 | } |
| 280 | |
| 281 | //static void GenMMC1Init(int prg, int chr, int wram, int battery) |
| 282 | void SAROM_Init(void) |
| 283 | { |
| 284 | GenMMC1Init(128, 64, 8, 1); |
| 285 | } |
| 286 | |
| 287 | void SBROM_Init(void) |
| 288 | { |
| 289 | GenMMC1Init(128, 64, 0, 0); |
| 290 | } |
| 291 | |
| 292 | void SCROM_Init(void) |
| 293 | { |
| 294 | GenMMC1Init(128, 128, 0, 0); |
| 295 | } |
| 296 | |
| 297 | void SEROM_Init(void) |
| 298 | { |
| 299 | GenMMC1Init(32, 64, 0, 0); |
| 300 | } |
| 301 | |
| 302 | void SGROM_Init(void) |
| 303 | { |
| 304 | GenMMC1Init(256, 0, 0, 0); |
| 305 | } |
| 306 | |
| 307 | void SKROM_Init(void) |
| 308 | { |
| 309 | GenMMC1Init(256, 64, 8, 1); |
| 310 | } |
| 311 | |
| 312 | void SLROM_Init(void) |
| 313 | { |
| 314 | GenMMC1Init(256, 128, 0, 0); |
| 315 | } |
| 316 | |
| 317 | void SL1ROM_Init(void) |
| 318 | { |
| 319 | GenMMC1Init(128, 128, 0, 0); |
| 320 | } |
| 321 | |
| 322 | /* Begin unknown - may be wrong - perhaps they use different MMC1s from the |
| 323 | similarly functioning boards? |
| 324 | */ |
| 325 | |
| 326 | void SL2ROM_Init(void) |
| 327 | { |
| 328 | GenMMC1Init(256, 256, 0, 0); |
| 329 | } |
| 330 | |
| 331 | void SFROM_Init(void) |
| 332 | { |
| 333 | GenMMC1Init(256, 256, 0, 0); |
| 334 | } |
| 335 | |
| 336 | void SHROM_Init(void) |
| 337 | { |
| 338 | GenMMC1Init(256, 256, 0, 0); |
| 339 | } |
| 340 | |
| 341 | /* End unknown */ |
| 342 | /* */ |
| 343 | /* */ |
| 344 | |
| 345 | void SNROM_Init(void) |
| 346 | { |
| 347 | GenMMC1Init(256, 0, 8, 1); |
| 348 | } |
| 349 | |
| 350 | void SOROM_Init(void) |
| 351 | { |
| 352 | GenMMC1Init(256, 0, 16, 1); |
| 353 | } |
| 354 | |
| 355 | |