boards/164.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 2002 Xodnizel
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "mapinc.h"
  22
  23 static uint8 cmd;
  24 static uint8 DRegs[8];
  25 static SFORMAT StateRegs[]=
  26 {
  27   {&cmd, 1, "CMD"},
  28   {DRegs, 8, "DREG"},
  29   {0}
  30 };
  31
  32 static void Sync(void)
  33 {
  34   setprg32(0x8000,(DRegs[0]<<4)|(DRegs[1]&0xF));
  35   setchr8(0);
  36 }
  37
  38 static void StateRestore(int version)
  39 {
  40   Sync();
  41 }
  42
  43 static DECLFW(Write)
  44 {
  45   switch (A&0x7300)
  46   {
  47     case 0x5100: DRegs[0]=V; Sync(); break;
  48     case 0x5000: DRegs[1]=V; Sync(); break;
  49   }
  50 }
  51
  52 static DECLFW(Write2)
  53 {
  54   switch (A&0x7300)
  55   {
  56     case 0x5200: DRegs[0]=V; Sync(); break;
  57     case 0x5000: DRegs[1]=V; Sync(); break;
  58   }
  59 }
  60
  61 static uint8 WRAM[8192];
  62 static DECLFR(AWRAM)
  63 {
  64   return(WRAM[A-0x6000]);
  65 }
  66
  67 static DECLFW(BWRAM)
  68 {
  69   WRAM[A-0x6000]=V;
  70 }
  71
  72 static void Power(void)
  73 {
  74   memset(DRegs,0,8);
  75   DRegs[1]=0xFF;
  76   cmd=0;
  77   SetReadHandler(0x8000,0xFFFF,CartBR);
  78   SetWriteHandler(0x4020,0xFFFF,Write);
  79   SetReadHandler(0x6000,0x7FFF,AWRAM);
  80   SetWriteHandler(0x6000,0x7FFF,BWRAM);
  81   Sync();
  82 }
  83
  84 static void M163HB(void)
  85 {
  86   if(scanline==127&&DRegs[1]&0x80)
  87     setchr4(0x0000,1);
  88 }
  89
  90
  91 static void Power2(void)
  92 {
  93   memset(DRegs,0,8);
  94   DRegs[1]=0xFF;
  95   cmd=0;
  96   SetReadHandler(0x8000,0xFFFF,CartBR);
  97   SetWriteHandler(0x4020,0xFFFF,Write2);
  98   SetReadHandler(0x6000,0x7FFF,AWRAM);
  99   SetWriteHandler(0x6000,0x7FFF,BWRAM);
 100   Sync();
 101 }
 102
 103 void Mapper164_Init(CartInfo *info)
 104 {
 105   info->Power=Power;
 106   GameStateRestore=StateRestore;
 107   AddExState(&StateRegs, ~0, 0, 0);
 108 }
 109
 110 void Mapper163_Init(CartInfo *info)
 111 {
 112   info->Power=Power2;
 113   GameHBIRQHook=M163HB;
 114   GameStateRestore=StateRestore;
 115   AddExState(&StateRegs, ~0, 0, 0);
 116 }