mappers/6.c

   1 /* FCE Ultra - NES/Famicom Emulator\r
   2  *\r
   3  * Copyright notice for this file:\r
   4  *  Copyright (C) 2002 Xodnizel\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 FFEmode;\r
  24 \r
  25 #define FVRAM_BANK8(A,V) {VPage[0]=VPage[1]=VPage[2]=VPage[3]=VPage[4]=VPage[5]=VPage[6]=VPage[7]=V?&MapperExRAM[(V)<<13]-(A):&CHRRAM[(V)<<13]-(A);CHRBankList[0]=((V)<<3);CHRBankList[1]=((V)<<3)+1;CHRBankList[2]=((V)<<3)+2;CHRBankList[3]=((V)<<3)+3;CHRBankList[4]=((V)<<3)+4;CHRBankList[5]=((V)<<3)+5;CHRBankList[6]=((V)<<3)+6;CHRBankList[7]=((V)<<3)+7;PPUCHRRAM=0xFF;}\r
  26 \r
  27 static void FP_FASTAPASS(1) FFEIRQHook(int a)\r
  28 {\r
  29   if(IRQa)\r
  30   {\r
  31    IRQCount+=a;\r
  32    if(IRQCount>=0x10000)\r
  33    {\r
  34     X6502_IRQBegin(FCEU_IQEXT);\r
  35     IRQa=0;\r
  36     IRQCount=0;\r
  37    }\r
  38   }\r
  39 }\r
  40 \r
  41 DECLFW(Mapper6_write)\r
  42 {\r
  43         if(A<0x8000)\r
  44         {\r
  45                 switch(A){\r
  46                 case 0x42FF:MIRROR_SET((V>>4)&1);break;\r
  47                 case 0x42FE:onemir((V>>3)&2); FFEmode=V&0x80;break;\r
  48                 case 0x4501:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;\r
  49                 case 0x4502:IRQCount&=0xFF00;IRQCount|=V;break;\r
  50                 case 0x4503:IRQCount&=0xFF;IRQCount|=V<<8;IRQa=1;break;\r
  51                 }\r
  52         } else {\r
  53          switch (FFEmode)\r
  54          {\r
  55            case 0x80:  setchr8(V); break;\r
  56            default: ROM_BANK16(0x8000,V>>2);\r
  57                     FVRAM_BANK8(0x0000,V&3);\r
  58          }\r
  59         }\r
  60 }\r
  61 void Mapper6_StateRestore(int version)\r
  62 {\r
  63  int x;\r
  64  for(x=0;x<8;x++)\r
  65   if(PPUCHRRAM&(1<<x))\r
  66   {\r
  67    if(CHRBankList[x]>7)\r
  68     VPage[x]=&MapperExRAM[(CHRBankList[x]&31)*0x400]-(x*0x400);\r
  69    else VPage[x]=&CHRRAM[(CHRBankList[x]&7)*0x400]-(x*0x400);\r
  70   }\r
  71 }\r
  72 void Mapper6_init(void)\r
  73 {\r
  74 MapIRQHook=FFEIRQHook;\r
  75 ROM_BANK16(0xc000,7);\r
  76 \r
  77 SetWriteHandler(0x4020,0x5fff,Mapper6_write);\r
  78 SetWriteHandler(0x8000,0xffff,Mapper6_write);\r
  79 MapStateRestore=Mapper6_StateRestore;\r
  80 }\r