merge mapper code from FCEUX

[fceu.git] / boards / 253.c

diff --git a/boards/253.c b/boards/253.c
new file mode 100644 (file)
index 0000000..6e3b569
--- /dev/null
+++ b/boards/253.c
@@ -0,0 +1,175 @@
+/* FCE Ultra - NES/Famicom Emulator\r
+ *\r
+ * Copyright notice for this file:\r
+ *  Copyright (C) 2009 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 chrlo[8], chrhi[8], prg[2], mirr, vlock;\r
+static int32 IRQa, IRQCount, IRQLatch, IRQClock; \r
+static uint8 *WRAM=NULL;\r
+static uint32 WRAMSIZE;\r
+static uint8 *CHRRAM=NULL;\r
+static uint32 CHRRAMSIZE;\r
+\r
+static SFORMAT StateRegs[]=\r
+{\r
+  {chrlo, 8, "CHRLO"},\r
+  {chrhi, 8, "CHRHI"},\r
+  {prg, 2, "PRGR"},\r
+  {&mirr, 1, "MIRR"},\r
+  {&vlock, 1, "VLOCK"},\r
+  {&IRQa, 4, "IRQA"},\r
+  {&IRQCount, 4, "IRQC"},\r
+  {&IRQLatch, 4, "IRQL"},\r
+  {&IRQClock, 4, "IRQK"},\r
+  {0}\r
+};\r
+\r
+static void Sync(void)\r
+{\r
+  uint8 i;\r
+  setprg8r(0x10,0x6000,0);\r
+  setprg8(0x8000,prg[0]);\r
+  setprg8(0xa000,prg[1]);\r
+  setprg8(0xc000,~1);\r
+  setprg8(0xe000,~0);\r
+  for(i=0; i<8; i++)\r
+  {\r
+    uint32 chr = chrlo[i]|(chrhi[i]<<8);\r
+    if(chrlo[i]==0xc8)\r
+    {\r
+      vlock = 0;\r
+      continue;\r
+    }\r
+    else if(chrlo[i]==0x88)\r
+    {\r
+      vlock = 1;\r
+      continue;\r
+    }\r
+    if(((chrlo[i]==4)||(chrlo[i]==5))&&!vlock)\r
+      setchr1r(0x10,i<<10,chr&1);\r
+    else\r
+      setchr1(i<<10,chr);\r
+  }\r
+  switch(mirr)\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 DECLFW(M253Write)\r
+{\r
+  if((A>=0xB000)&&(A<=0xE00C))\r
+  {\r
+    uint8 ind=((((A&8)|(A>>8))>>3)+2)&7;\r
+    uint8 sar=A&4;\r
+    chrlo[ind]=(chrlo[ind]&(0xF0>>sar))|((V&0x0F)<<sar);\r
+    if(A&4)\r
+      chrhi[ind]=V>>4;\r
+    Sync();\r
+  }\r
+  else\r
+   switch(A)\r
+    {\r
+      case 0x8010: prg[0]=V; Sync(); break;\r
+      case 0xA010: prg[1]=V; Sync(); break;\r
+      case 0x9400: mirr=V&3; Sync(); break;\r
+      case 0xF000: IRQLatch = (IRQLatch & 0xF0) | (V & 0x0F); break;\r
+      case 0xF004: IRQLatch = (IRQLatch & 0x0F) | (V << 4); break;\r
+      case 0xF008:\r
+        IRQa = V&3;\r
+        if(IRQa&2)\r
+        {\r
+          IRQCount = IRQLatch;\r
+          IRQClock = 0;\r
+        }\r
+        X6502_IRQEnd(FCEU_IQEXT);\r
+        break;\r
+    }\r
+}\r
+\r
+static void M253Power(void)\r
+{\r
+  Sync();\r
+  SetReadHandler(0x6000,0x7FFF,CartBR);\r
+  SetWriteHandler(0x6000,0x7FFF,CartBW);\r
+  SetReadHandler(0x8000,0xFFFF,CartBR);\r
+  SetWriteHandler(0x8000,0xFFFF,M253Write);\r
+}\r
+\r
+static void M253Close(void)\r
+{\r
+  if(WRAM)\r
+    FCEU_gfree(WRAM);\r
+  if(CHRRAM)\r
+    FCEU_gfree(CHRRAM);\r
+  WRAM=CHRRAM=NULL;\r
+}\r
+\r
+static void M253IRQ(int cycles)\r
+{\r
+  if(IRQa&2) \r
+  {\r
+    if((IRQClock+=cycles)>=0x72) \r
+    {\r
+      IRQClock -= 0x72;\r
+      if(IRQCount==0xFF)  \r
+      {\r
+        IRQCount = IRQLatch;\r
+        IRQa = IRQa|((IRQa&1)<<1);\r
+        X6502_IRQBegin(FCEU_IQEXT);\r
+      }\r
+      else \r
+        IRQCount++;\r
+    }\r
+  }\r
+}\r
+\r
+static void StateRestore(int version)\r
+{\r
+  Sync();\r
+}\r
+\r
+void Mapper253_Init(CartInfo *info)\r
+{\r
+  info->Power=M253Power;\r
+  info->Close=M253Close;\r
+  MapIRQHook=M253IRQ;\r
+  GameStateRestore=StateRestore;\r
+\r
+  CHRRAMSIZE=4096;\r
+  CHRRAM=(uint8*)FCEU_gmalloc(CHRRAMSIZE);\r
+  SetupCartCHRMapping(0x10,CHRRAM,CHRRAMSIZE,1);\r
+  AddExState(CHRRAM, CHRRAMSIZE, 0, "CRAM");\r
+\r
+  WRAMSIZE=8192;\r
+  WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
+  SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
+  AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
+  if(info->battery)\r
+  {\r
+    info->SaveGame[0]=WRAM;\r
+    info->SaveGameLen[0]=WRAMSIZE;\r
+  }\r
+\r
+  AddExState(&StateRegs, ~0, 0, 0);\r
+}\r