merge mappers from FCEU-mm

[fceu.git] / boards / 18.c

diff --git a/boards/18.c b/boards/18.c
new file mode 100644 (file)
index 0000000..4b07474
--- /dev/null
+++ b/boards/18.c
@@ -0,0 +1,121 @@
+/* FCE Ultra - NES/Famicom Emulator\r
+ *\r
+ * Copyright notice for this file:\r
+ *  Copyright (C) 2012 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
+ */\r
+\r
+#include "mapinc.h"\r
+\r
+static uint8 preg[4], creg[8];\r
+static uint8 IRQa, mirr;\r
+static int32 IRQCount, IRQLatch;\r
+\r
+static SFORMAT StateRegs[]=\r
+{\r
+  {preg, 4, "PREG"},\r
+  {creg, 8, "CREG"},\r
+  {&mirr, 1, "MIRR"},\r
+  {&IRQa, 1, "IRQA"},\r
+  {&IRQCount, 4, "IRQC"},\r
+  {&IRQLatch, 4, "IRQL"},\r
+  {0}\r
+};\r
+\r
+static void Sync(void)\r
+{\r
+  int i;\r
+  for(i=0; i<8; i++) setchr1(i<<10,creg[i]);\r
+  setprg8(0x8000,preg[0]);\r
+  setprg8(0xA000,preg[1]);\r
+  setprg8(0xC000,preg[2]);\r
+  setprg8(0xE000,~0);\r
+  if(mirr & 2)\r
+    setmirror(MI_0);\r
+  else\r
+    setmirror(mirr & 1);\r
+}\r
+\r
+static DECLFW(M18WriteIRQ)\r
+{\r
+  switch(A & 0xF003) {\r
+    case 0xE000: IRQLatch&=0xFFF0; IRQLatch|=(V&0x0f)<<0x0;break;\r
+    case 0xE001: IRQLatch&=0xFF0F; IRQLatch|=(V&0x0f)<<0x4; break;\r
+    case 0xE002: IRQLatch&=0xF0FF; IRQLatch|=(V&0x0f)<<0x8; break;\r
+    case 0xE003: IRQLatch&=0x0FFF; IRQLatch|=(V&0x0f)<<0xC; break;\r
+    case 0xF000: IRQCount=IRQLatch; break;\r
+    case 0xF001: IRQa=V&1; X6502_IRQEnd(FCEU_IQEXT); break;\r
+    case 0xF002: mirr = V&3; Sync(); break;\r
+  }\r
+}\r
+\r
+static DECLFW(M18WritePrg)\r
+{\r
+  uint32 i = ((A >> 1) & 1)|((A - 0x8000) >> 11);\r
+  preg[i] &= (0xF0) >> ((A & 1) << 2);\r
+  preg[i] |= (V & 0xF) << ((A & 1) << 2);\r
+  Sync();\r
+}\r
+\r
+static DECLFW(M18WriteChr)\r
+{\r
+  uint32 i = ((A >> 1) & 1)|((A - 0xA000) >> 11);\r
+  creg[i] &= (0xF0) >> ((A & 1) << 2);\r
+  creg[i] |= (V & 0xF) << ((A & 1) << 2);\r
+  Sync();\r
+}\r
+\r
+static void M18Power(void)\r
+{\r
+  preg[0] = 0;\r
+  preg[1] = 1;\r
+  preg[2] = ~1;\r
+  preg[3] = ~0;\r
+  Sync();\r
+  SetReadHandler(0x8000,0xFFFF,CartBR);\r
+  SetWriteHandler(0x8000,0x9FFF,M18WritePrg);\r
+  SetWriteHandler(0xA000,0xDFFF,M18WriteChr);\r
+  SetWriteHandler(0xE000,0xFFFF,M18WriteIRQ);\r
+}\r
+\r
+static void FP_FASTAPASS(1) M18IRQHook(int a)\r
+{\r
+  if(IRQa && IRQCount)\r
+  {\r
+    IRQCount-=a;\r
+    if(IRQCount<=0)\r
+    {\r
+      X6502_IRQBegin(FCEU_IQEXT);\r
+      IRQCount=0;\r
+      IRQa=0;\r
+    }\r
+  }\r
+}\r
+\r
+static void StateRestore(int version)\r
+{\r
+  Sync();\r
+}\r
+\r
+void Mapper18_Init(CartInfo *info)\r
+{\r
+  info->Power=M18Power;\r
+  MapIRQHook=M18IRQHook;\r
+  GameStateRestore=StateRestore;\r
+\r
+  AddExState(&StateRegs, ~0, 0, 0);\r
+}\r
+\r