boards/a9746.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 \r
  21 #include "mapinc.h"\r
  22 #include "mmc3.h"\r
  23 \r
  24 static DECLFW(UNLA9746Write)\r
  25 {\r
  26 //   FCEU_printf("write raw %04x:%02x\n",A,V);\r
  27    switch (A&0xE003)\r
  28    {\r
  29      case 0x8000: EXPREGS[1]=V; EXPREGS[0]=0; break;\r
  30      case 0x8002: EXPREGS[0]=V; EXPREGS[1]=0; break;\r
  31      case 0x8001: {\r
  32                     uint8 bits_rev = ((V&0x20)>>5)|((V&0x10)>>3)|((V&0x08)>>1)|((V&0x04)<<1);\r
  33                     switch(EXPREGS[0])\r
  34                     {\r
  35                       case 0x26: setprg8(0x8000, bits_rev); break;\r
  36                       case 0x25: setprg8(0xA000, bits_rev); break; \r
  37                       case 0x24: setprg8(0xC000, bits_rev); break; \r
  38                       case 0x23: setprg8(0xE000, bits_rev); break;\r
  39                     }\r
  40                     switch(EXPREGS[1])\r
  41                     {\r
  42                       case 0x0a:\r
  43                       case 0x08: EXPREGS[2] = (V << 4); break;\r
  44                       case 0x09: setchr1(0x0000, EXPREGS[2]|(V >> 1)); break;\r
  45                       case 0x0b: setchr1(0x0400, EXPREGS[2]|(V >> 1)|1);  break;\r
  46                       case 0x0c:\r
  47                       case 0x0e: EXPREGS[2] = (V << 4);  break;\r
  48                       case 0x0d: setchr1(0x0800, EXPREGS[2]|(V >> 1));  break;\r
  49                       case 0x0f: setchr1(0x0c00, EXPREGS[2]|(V >> 1)|1);  break;\r
  50                       case 0x10:\r
  51                       case 0x12: EXPREGS[2] = (V << 4);  break;\r
  52                       case 0x11: setchr1(0x1000, EXPREGS[2]|(V >> 1)); break;\r
  53                       case 0x14:\r
  54                       case 0x16: EXPREGS[2] = (V << 4);  break;\r
  55                       case 0x15: setchr1(0x1400, EXPREGS[2]|(V >> 1));  break;\r
  56                       case 0x18:\r
  57                       case 0x1a: EXPREGS[2] = (V << 4);  break;\r
  58                       case 0x19: setchr1(0x1800, EXPREGS[2]|(V >> 1));  break;\r
  59                       case 0x1c:\r
  60                       case 0x1e: EXPREGS[2] = (V << 4);  break;\r
  61                       case 0x1d: setchr1(0x1c00, EXPREGS[2]|(V >> 1));  break;\r
  62                     }\r
  63                   }\r
  64                   break;\r
  65    }\r
  66 }\r
  67 \r
  68 static void UNLA9746Power(void)\r
  69 {\r
  70   GenMMC3Power();\r
  71   SetWriteHandler(0x8000,0xbfff,UNLA9746Write);\r
  72 }\r
  73 \r
  74 void UNLA9746_Init(CartInfo *info)\r
  75 {\r
  76   GenMMC3_Init(info, 128, 256, 0, 0);\r
  77   info->Power=UNLA9746Power;\r
  78   AddExState(EXPREGS, 6, 0, "EXPR");\r
  79 }\r
  80 \r