-/* FCE Ultra - NES/Famicom Emulator\r
- *\r
- * Copyright notice for this file:\r
- * Copyright (C) 2005 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 uint16 cmdreg;\r
-static SFORMAT StateRegs[]=\r
-{\r
- {&cmdreg, 2, "CMDREG"},\r
- {0}\r
-};\r
-\r
-static void Sync(void)\r
-{\r
- setprg16r((cmdreg&0x060)>>5,0x8000,(cmdreg&0x01C)>>2);\r
- setprg16r((cmdreg&0x060)>>5,0xC000,(cmdreg&0x200)?(~0):0);\r
- setmirror(((cmdreg&2)>>1)^1);\r
-}\r
-\r
-static DECLFR(UNL8157Read)\r
-{\r
- if(cmdreg&0x100)\r
- return 0xFF;\r
- else\r
- return CartBR(A);\r
-}\r
-\r
-static DECLFW(UNL8157Write)\r
-{\r
- cmdreg=A;\r
- Sync();\r
-}\r
-\r
-static void UNL8157Power(void)\r
-{\r
- setchr8(0);\r
- SetWriteHandler(0x8000,0xFFFF,UNL8157Write);\r
- SetReadHandler(0x8000,0xFFFF,UNL8157Read);\r
- cmdreg=0;\r
- Sync();\r
-}\r
-\r
-static void UNL8157Reset(void)\r
-{\r
- cmdreg=0;\r
- Sync();\r
-}\r
-\r
-static void UNL8157Restore(int version)\r
-{\r
- Sync();\r
-}\r
-\r
-void UNL8157_Init(CartInfo *info)\r
-{\r
- info->Power=UNL8157Power;\r
- info->Reset=UNL8157Reset;\r
- GameStateRestore=UNL8157Restore;\r
- AddExState(&StateRegs, ~0, 0, 0);\r
-}\r
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ * Copyright (C) 2005 CaH4e3
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "mapinc.h"
+
+static uint16 cmdreg;
+static uint8 invalid_data;
+static SFORMAT StateRegs[]=
+{
+ {&cmdreg, 2, "CMDREG"},
+ {0}
+};
+
+static void Sync(void)
+{
+ setprg16r((cmdreg&0x060)>>5,0x8000,(cmdreg&0x01C)>>2);
+ setprg16r((cmdreg&0x060)>>5,0xC000,(cmdreg&0x200)?(~0):0);
+ setmirror(((cmdreg&2)>>1)^1);
+}
+
+static DECLFR(UNL8157Read)
+{
+ if(invalid_data&&cmdreg&0x100)
+ return 0xFF;
+ else
+ return CartBR(A);
+}
+
+static DECLFW(UNL8157Write)
+{
+ cmdreg=A;
+ Sync();
+}
+
+static void UNL8157Power(void)
+{
+ setchr8(0);
+ SetWriteHandler(0x8000,0xFFFF,UNL8157Write);
+ SetReadHandler(0x8000,0xFFFF,UNL8157Read);
+ cmdreg=0x200;
+ invalid_data=1;
+ Sync();
+}
+
+static void UNL8157Reset(void)
+{
+ cmdreg=0;
+ invalid_data^=1;
+ Sync();
+}
+
+static void UNL8157Restore(int version)
+{
+ Sync();
+}
+
+void UNL8157_Init(CartInfo *info)
+{
+ info->Power=UNL8157Power;
+ info->Reset=UNL8157Reset;
+ GameStateRestore=UNL8157Restore;
+ AddExState(&StateRegs, ~0, 0, 0);
+}