merge mapper code from FCEUX

[fceu.git] / boards / 68.c

diff --git a/boards/68.c b/boards/68.c
new file mode 100644 (file)
index 0000000..6a9420c
--- /dev/null
+++ b/boards/68.c
@@ -0,0 +1,178 @@
+/* FCE Ultra - NES/Famicom Emulator\r
+ *\r
+ * Copyright notice for this file:\r
+ *  Copyright (C) 2006 CaH4e3\r
+ *\r
+ * This program is free software; you can redistribute it and/or modify\r
+ * it under the terms of the GNU General Public License as published by\r
+ * the Free Software Foundation; either version 2 of the License, or\r
+ * (at your option) any later version.\r
+ *\r
+ * This program is distributed in the hope that it will be useful,\r
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
+ * GNU General Public License for more details.\r
+ *\r
+ * You should have received a copy of the GNU General Public License\r
+ * along with this program; if not, write to the Free Software\r
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA\r
+ */\r
+\r
+#include "mapinc.h"\r
+\r
+static uint8 chr_reg[4];\r
+static uint8 kogame, prg_reg, nt1, nt2, mirr;\r
+\r
+static uint8 *WRAM=NULL;\r
+static uint32 WRAMSIZE, count;\r
+\r
+static SFORMAT StateRegs[]=\r
+{\r
+  {&nt1, 1, "NT1"},\r
+  {&nt2, 1, "NT2"},\r
+  {&mirr, 1, "MIRR"},\r
+  {&prg_reg, 1, "PRG"},\r
+  {&kogame, 1, "KOGAME"},\r
+  {&count, 4, "COUNT"},\r
+  {chr_reg, 4, "CHR"},\r
+  {0}\r
+};\r
+\r
+static void M68NTfix(void)\r
+{\r
+  if((!UNIFchrrama)&&(mirr&0x10))\r
+  {\r
+    PPUNTARAM = 0;\r
+    switch(mirr&3)\r
+    {\r
+     case 0: vnapage[0]=vnapage[2]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r
+             vnapage[1]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r
+             break;\r
+     case 1: vnapage[0]=vnapage[1]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r
+             vnapage[2]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r
+             break;\r
+     case 2: vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r
+             break;\r
+     case 3: vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r
+             break;\r
+    }\r
+  }\r
+  else\r
+    switch(mirr&3)\r
+    {\r
+      case 0: setmirror(MI_V); break;\r
+      case 1: setmirror(MI_H); break;\r
+      case 2: setmirror(MI_0); break;\r
+      case 3: setmirror(MI_1); break;\r
+    }\r
+}\r
+\r
+static void Sync(void)\r
+{\r
+  setchr2(0x0000,chr_reg[0]);\r
+  setchr2(0x0800,chr_reg[1]);\r
+  setchr2(0x1000,chr_reg[2]);\r
+  setchr2(0x1800,chr_reg[3]);\r
+  setprg8r(0x10,0x6000,0);\r
+  setprg16r((PRGptr[1])?kogame:0,0x8000,prg_reg);\r
+  setprg16(0xC000,~0);\r
+}\r
+\r
+static DECLFR(M68Read)\r
+{\r
+  if(!(kogame&8))\r
+  {\r
+    count++;\r
+    if(count==1784)\r
+      setprg16r(0,0x8000,prg_reg);\r
+  }\r
+  return CartBR(A);\r
+}\r
+\r
+static DECLFW(M68WriteLo)\r
+{\r
+  if(!V)\r
+  { \r
+    count = 0;\r
+    setprg16r((PRGptr[1])?kogame:0,0x8000,prg_reg);\r
+  }\r
+}\r
+\r
+static DECLFW(M68WriteCHR)\r
+{\r
+  chr_reg[(A>>12)&3]=V;\r
+  Sync();\r
+}\r
+\r
+static DECLFW(M68WriteNT1)\r
+{\r
+  nt1 = V;            \r
+  M68NTfix();\r
+}\r
+\r
+static DECLFW(M68WriteNT2)\r
+{\r
+  nt2 = V;            \r
+  M68NTfix();\r
+}\r
+\r
+static DECLFW(M68WriteMIR)\r
+{\r
+  mirr = V;\r
+  M68NTfix();\r
+}\r
+\r
+static DECLFW(M68WriteROM)\r
+{\r
+  prg_reg = V&7;\r
+  kogame = ((V>>3)&1)^1;\r
+  Sync();\r
+}\r
+\r
+static void M68Power(void)\r
+{\r
+  prg_reg = 0;\r
+  kogame = 0;\r
+  Sync();\r
+  M68NTfix();\r
+  SetReadHandler(0x6000,0x7FFF,CartBR);\r
+  SetReadHandler(0x8000,0xBFFF,M68Read);\r
+  SetReadHandler(0xC000,0xFFFF,CartBR);\r
+  SetWriteHandler(0x8000,0xBFFF,M68WriteCHR);\r
+  SetWriteHandler(0xC000,0xCFFF,M68WriteNT1);\r
+  SetWriteHandler(0xD000,0xDFFF,M68WriteNT2);\r
+  SetWriteHandler(0xE000,0xEFFF,M68WriteMIR);\r
+  SetWriteHandler(0xF000,0xFFFF,M68WriteROM);\r
+  SetWriteHandler(0x6000,0x6000,M68WriteLo);\r
+  SetWriteHandler(0x6001,0x7FFF,CartBW);\r
+}\r
+\r
+static void M68Close(void)\r
+{\r
+  if(WRAM)\r
+    FCEU_gfree(WRAM);\r
+  WRAM=NULL;\r
+}\r
+\r
+static void StateRestore(int version)\r
+{\r
+  Sync();\r
+  M68NTfix();\r
+}\r
+\r
+void Mapper68_Init(CartInfo *info)\r
+{\r
+  info->Power=M68Power;\r
+  info->Close=M68Close;\r
+  GameStateRestore=StateRestore;\r
+  WRAMSIZE=8192;\r
+  WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
+  SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
+  if(info->battery)\r
+  {\r
+    info->SaveGame[0]=WRAM;\r
+    info->SaveGameLen[0]=WRAMSIZE;\r
+  }\r
+  AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
+  AddExState(&StateRegs, ~0, 0, 0);\r
+}\r