boards/bonza.c

   1 /* FCE Ultra - NES/Famicom Emulator\r
   2  *\r
   3  * Copyright notice for this file:\r
   4  *  Copyright (C) 2002 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 \r
  23 static uint8 prg_reg;\r
  24 static uint8 chr_reg;\r
  25 \r
  26 static uint8 sim0reg, sim0bit, sim0byte, sim0parity, sim0bcnt;\r
  27 static uint16 sim0data;\r
  28 static uint8 sim0array[128] =\r
  29 {\r
  30   0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r
  31   0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r
  32   0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r
  33   0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r
  34   0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r
  35   0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r
  36   0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r
  37   0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xAA,\r
  38 };\r
  39 \r
  40 static SFORMAT StateRegs[]=\r
  41 {\r
  42   {&prg_reg, 1, "PREG"},\r
  43   {&chr_reg, 1, "CREG"},\r
  44   {0}\r
  45 };\r
  46 \r
  47 static void Sync(void)\r
  48 {\r
  49   setprg32(0x8000, prg_reg);\r
  50   setchr8(chr_reg);\r
  51 }\r
  52 \r
  53 static void StateRestore(int version)\r
  54 {\r
  55   Sync();\r
  56 }\r
  57 \r
  58 static DECLFW(M216WriteHi)\r
  59 {\r
  60 // FCEU_printf("%04x:%04x\n",A,V);\r
  61   prg_reg=A&1;\r
  62   chr_reg=(A&0x0E)>>1;\r
  63   Sync();\r
  64 }\r
  65 \r
  66 static DECLFW(M216Write5000)\r
  67 {\r
  68 // FCEU_printf("WRITE: %04x:%04x\n",A,V);\r
  69   sim0reg=V;\r
  70   if(!sim0reg)\r
  71   {\r
  72     sim0bit=sim0byte=sim0parity=0;\r
  73     sim0data=sim0array[0];\r
  74     sim0bcnt=0x80;\r
  75   }\r
  76   else if(sim0reg&0x20)\r
  77   {\r
  78     sim0bcnt=0x20;\r
  79   }\r
  80 }\r
  81 \r
  82 static DECLFR(M216Read5000)\r
  83 {\r
  84   if(sim0reg&0x60)\r
  85   {\r
  86     sim0reg=(sim0reg^(sim0reg<<1))&0x40;\r
  87     return sim0reg;\r
  88   }\r
  89   else\r
  90   {\r
  91     uint8 sim0out=0;\r
  92     if(sim0bit<8)\r
  93     {\r
  94 //       sim0data=((sim0array[sim0byte]<<(sim0bit))&0x80)>>1;\r
  95       sim0out=(sim0data&1)<<6;\r
  96       sim0data>>=1;\r
  97       sim0bit++;\r
  98       sim0parity+=sim0data;\r
  99     }\r
 100     else if(sim0bit==8)\r
 101     {\r
 102       sim0bit++;\r
 103       sim0out=sim0parity&1;\r
 104     }\r
 105     else if(sim0bit==9)\r
 106     {\r
 107       if(sim0byte==sim0bcnt)\r
 108         sim0out=0x60;\r
 109       else\r
 110       {\r
 111         sim0bit=0;\r
 112         sim0byte++;\r
 113         sim0data=sim0array[sim0byte];\r
 114         sim0out=0;\r
 115       }\r
 116     }\r
 117 //    FCEU_printf("READ: %04x (%04x-%02x,%04x)\n",A,X.PC,sim0out,sim0byte);\r
 118     return sim0out;\r
 119   }\r
 120 }\r
 121 \r
 122 static void Power(void)\r
 123 {\r
 124   prg_reg = 0;\r
 125   chr_reg = 0;\r
 126   Sync();\r
 127   SetReadHandler(0x8000,0xFFFF,CartBR);\r
 128   SetWriteHandler(0x8000,0xFFFF,M216WriteHi);\r
 129   SetWriteHandler(0x5000,0x5000,M216Write5000);\r
 130   SetReadHandler(0x5000,0x5000,M216Read5000);\r
 131 }\r
 132 \r
 133 \r
 134 void Mapper216_Init(CartInfo *info)\r
 135 {\r
 136   info->Power=Power;\r
 137   GameStateRestore=StateRestore;\r
 138   AddExState(&StateRegs, ~0, 0, 0);\r
 139 }\r