boards/23.c

   1 /* FCE Ultra - NES/Famicom Emulator\r
   2  *\r
   3  * Copyright notice for this file:\r
   4  *  Copyright (C) 2007 CaH4e3\r
   5  *\r
   6  * This program is free software; you can redistribute it and/or modify\r
   7  * it under the terms of the GNU General Public License as published by\r
   8  * the Free Software Foundation; either version 2 of the License, or\r
   9  * (at your option) any later version.\r
  10  *\r
  11  * This program is distributed in the hope that it will be useful,\r
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14  * GNU General Public License for more details.\r
  15  *\r
  16  * You should have received a copy of the GNU General Public License\r
  17  * along with this program; if not, write to the Free Software\r
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
  19  *\r
  20  * VRC-2/VRC-4 Konami\r
  21  * VRC-4 Pirate\r
  22  */\r
  23 \r
  24 #include "mapinc.h"\r
  25 \r
  26 static uint8 is23;\r
  27 static uint16 IRQCount;\r
  28 static uint8 IRQLatch,IRQa;\r
  29 static uint8 prgreg[2];\r
  30 static uint8 chrreg[8];\r
  31 static uint8 regcmd, irqcmd, mirr, big_bank;\r
  32 static uint16 acount=0;\r
  33 \r
  34 static uint8 *WRAM=NULL;\r
  35 static uint32 WRAMSIZE;\r
  36 \r
  37 static SFORMAT StateRegs[]=\r
  38 {\r
  39   {prgreg, 2, "PREG"},\r
  40   {chrreg, 8, "CREG"},\r
  41   {&regcmd, 1, "CMDR"},\r
  42   {&irqcmd, 1, "CMDI"},\r
  43   {&mirr, 1, "MIRR"},\r
  44   {&big_bank, 1, "BIGB"},\r
  45   {&IRQCount, 2, "IRQC"},\r
  46   {&IRQLatch, 1, "IRQL"},\r
  47   {&IRQa, 1, "IRQA"},\r
  48   {0}\r
  49 };\r
  50 \r
  51 static void Sync(void)\r
  52 {\r
  53   if(regcmd&2)\r
  54   {\r
  55     setprg8(0xC000,prgreg[0]|big_bank);\r
  56     setprg8(0x8000,((~1)&0x1F)|big_bank);\r
  57   }\r
  58   else\r
  59   {\r
  60     setprg8(0x8000,prgreg[0]|big_bank);\r
  61     setprg8(0xC000,((~1)&0x1F)|big_bank);\r
  62   }\r
  63   setprg8(0xA000,prgreg[1]|big_bank);\r
  64   setprg8(0xE000,((~0)&0x1F)|big_bank);\r
  65   if(UNIFchrrama)\r
  66     setchr8(0);\r
  67   else\r
  68   {\r
  69     uint8 i;\r
  70     for(i=0; i<8; i++)\r
  71        setchr1(i<<10, chrreg[i]);\r
  72   }\r
  73   switch(mirr&0x3)\r
  74   {\r
  75     case 0: setmirror(MI_V); break;\r
  76     case 1: setmirror(MI_H); break;\r
  77     case 2: setmirror(MI_0); break;\r
  78     case 3: setmirror(MI_1); break;\r
  79   }\r
  80 }\r
  81 \r
  82 static DECLFW(M23Write)\r
  83 {\r
  84 //  FCEU_printf("%04x:%04x\n",A,V);\r
  85   A|=((A>>2)&0x3)|((A>>4)&0x3)|((A>>6)&0x3); // actually there is many-in-one mapper source, some pirate or\r
  86                                              // licensed games use various address bits for registers\r
  87   A&=0xF003;\r
  88   if((A>=0xB000)&&(A<=0xE003))\r
  89   {\r
  90     if(UNIFchrrama)\r
  91       big_bank=(V&8)<<2;                    // my personally many-in-one feature ;) just for support pirate cart 2-in-1\r
  92     else\r
  93     {\r
  94       uint16 i=((A>>1)&1)|((A-0xB000)>>11);\r
  95       chrreg[i]&=(0xF0)>>((A&1)<<2);\r
  96       chrreg[i]|=(V&0xF)<<((A&1)<<2);\r
  97     }\r
  98     Sync();\r
  99   }\r
 100   else\r
 101     switch(A&0xF003)\r
 102     {\r
 103       case 0x8000:\r
 104       case 0x8001:\r
 105       case 0x8002:\r
 106       case 0x8003: if(is23)\r
 107                      prgreg[0]=V&0x1F;\r
 108                    Sync();\r
 109                    break;\r
 110       case 0xA000:\r
 111       case 0xA001:\r
 112       case 0xA002:\r
 113       case 0xA003: if(is23)\r
 114                      prgreg[1]=V&0x1F;\r
 115                    else\r
 116                    {\r
 117                      prgreg[0]=(V<<1)&0x1F;\r
 118                      prgreg[1]=((V<<1)&0x1F)|1;\r
 119                    }\r
 120                    Sync();\r
 121                    break;\r
 122       case 0x9000:\r
 123       case 0x9001: if(V!=0xFF) mirr=V; Sync(); break;\r
 124       case 0x9002:\r
 125       case 0x9003: regcmd=V; Sync(); break;\r
 126       case 0xF000: X6502_IRQEnd(FCEU_IQEXT); IRQLatch&=0xF0; IRQLatch|=V&0xF; break;\r
 127       case 0xF001: X6502_IRQEnd(FCEU_IQEXT); IRQLatch&=0x0F; IRQLatch|=V<<4; break;\r
 128       case 0xF002: X6502_IRQEnd(FCEU_IQEXT); acount=0; IRQCount=IRQLatch; IRQa=V&2; irqcmd=V&1; break;\r
 129       case 0xF003: X6502_IRQEnd(FCEU_IQEXT); IRQa=irqcmd; break;\r
 130     }\r
 131 }\r
 132 \r
 133 static void M23Power(void)\r
 134 {\r
 135   big_bank=0x20;\r
 136   Sync();\r
 137   setprg8r(0x10,0x6000,0);              // another many-in-one code, WRAM actually contain only WaiWaiWorld game\r
 138   SetReadHandler(0x6000,0x7FFF,CartBR);\r
 139   SetWriteHandler(0x6000,0x7FFF,CartBW);\r
 140   SetReadHandler(0x8000,0xFFFF,CartBR);\r
 141   SetWriteHandler(0x8000,0xFFFF,M23Write);\r
 142 }\r
 143 \r
 144 void FP_FASTAPASS(1) M23IRQHook(int a)\r
 145 {\r
 146   #define LCYCS 341\r
 147   if(IRQa)\r
 148   {\r
 149     acount+=a*3;\r
 150     if(acount>=LCYCS)\r
 151     {\r
 152       while(acount>=LCYCS)\r
 153       {\r
 154         acount-=LCYCS;\r
 155         IRQCount++;\r
 156         if(IRQCount&0x100)\r
 157         {\r
 158           X6502_IRQBegin(FCEU_IQEXT);\r
 159           IRQCount=IRQLatch;\r
 160         }\r
 161       }\r
 162     }\r
 163   }\r
 164 }\r
 165 \r
 166 static void StateRestore(int version)\r
 167 {\r
 168   Sync();\r
 169 }\r
 170 \r
 171 static void M23Close(void)\r
 172 {\r
 173   if(WRAM)\r
 174     FCEU_gfree(WRAM);\r
 175 }\r
 176 \r
 177 void Mapper23_Init(CartInfo *info)\r
 178 {\r
 179   is23=1;\r
 180   info->Power=M23Power;\r
 181   info->Close=M23Close;\r
 182   MapIRQHook=M23IRQHook;\r
 183   GameStateRestore=StateRestore;\r
 184 \r
 185   WRAMSIZE=8192;\r
 186   WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
 187   SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
 188   AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
 189 \r
 190   AddExState(&StateRegs, ~0, 0, 0);\r
 191 }\r
 192 \r
 193 void UNLT230_Init(CartInfo *info)\r
 194 {\r
 195   is23=0;\r
 196   info->Power=M23Power;\r
 197   info->Close=M23Close;\r
 198   MapIRQHook=M23IRQHook;\r
 199   GameStateRestore=StateRestore;\r
 200 \r
 201   WRAMSIZE=8192;\r
 202   WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
 203   SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
 204   AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
 205 \r
 206   AddExState(&StateRegs, ~0, 0, 0);\r
 207 }\r