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+/****************************************************
+ Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
+
+ (c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
+ Jerremy Koot (jkoot@snes9x.com)
+
+ (c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)
+
+ (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
+ funkyass (funkyass@spam.shaw.ca),
+ Joel Yliluoma (http://iki.fi/bisqwit/)
+ Kris Bleakley (codeviolation@hotmail.com),
+ Matthew Kendora,
+ Nach (n-a-c-h@users.sourceforge.net),
+ Peter Bortas (peter@bortas.org) and
+ zones (kasumitokoduck@yahoo.com)
+
+ C4 x86 assembler and some C emulation code
+ (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
+ _Demo_ (_demo_@zsnes.com), and Nach
+
+ C4 C++ code
+ (c) Copyright 2003 Brad Jorsch
+
+ DSP-1 emulator code
+ (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
+ John Weidman, neviksti (neviksti@hotmail.com),
+ Kris Bleakley, Andreas Naive
+
+ DSP-2 emulator code
+ (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
+ Lord Nightmare (lord_nightmare@users.sourceforge.net
+
+ OBC1 emulator code
+ (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
+ Kris Bleakley
+ Ported from x86 assembler to C by sanmaiwashi
+
+ SPC7110 and RTC C++ emulator code
+ (c) Copyright 2002 Matthew Kendora with research by
+ zsKnight, John Weidman, and Dark Force
+
+ S-DD1 C emulator code
+ (c) Copyright 2003 Brad Jorsch with research by
+ Andreas Naive and John Weidman
+
+ S-RTC C emulator code
+ (c) Copyright 2001 John Weidman
+
+ ST010 C++ emulator code
+ (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
+
+ Super FX x86 assembler emulator code
+ (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault
+
+ Super FX C emulator code
+ (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
+
+
+ SH assembler code partly based on x86 assembler code
+ (c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
+
+
+ Specific ports contains the works of other authors. See headers in
+ individual files.
+
+ Snes9x homepage: http://www.snes9x.com
+
+ Permission to use, copy, modify and distribute Snes9x in both binary and
+ source form, for non-commercial purposes, is hereby granted without fee,
+ providing that this license information and copyright notice appear with
+ all copies and any derived work.
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event shall the authors be held liable for any damages
+ arising from the use of this software.
+
+ Snes9x is freeware for PERSONAL USE only. Commercial users should
+ seek permission of the copyright holders first. Commercial use includes
+ charging money for Snes9x or software derived from Snes9x.
+
+ The copyright holders request that bug fixes and improvements to the code
+ should be forwarded to them so everyone can benefit from the modifications
+ in future versions.
+
+ Super NES and Super Nintendo Entertainment System are trademarks of
+ Nintendo Co., Limited and its subsidiary companies.
+*******************************************************************************/
+#include <string.h>
+#include "memmap.h"
+#include "obc1.h"
+
+static uint8 *OBC1_RAM = NULL;
+
+int OBC1_Address;
+int OBC1_BasePtr;
+int OBC1_Shift;
+
+extern "C"
+{
+uint8 GetOBC1 (uint16 Address)
+{
+ switch(Address) {
+ case 0x7ff0:
+ return OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2)];
+
+ case 0x7ff1:
+ return OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 1];
+
+ case 0x7ff2:
+ return OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 2];
+
+ case 0x7ff3:
+ return OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 3];
+
+ case 0x7ff4:
+ return OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200];
+ }
+
+ return OBC1_RAM[Address & 0x1fff];
+}
+
+void SetOBC1 (uint8 Byte, uint16 Address)
+{
+ switch(Address) {
+ case 0x7ff0:
+ {
+ OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2)] = Byte;
+ break;
+ }
+
+ case 0x7ff1:
+ {
+ OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 1] = Byte;
+ break;
+ }
+
+ case 0x7ff2:
+ {
+ OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 2] = Byte;
+ break;
+ }
+
+ case 0x7ff3:
+ {
+ OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 3] = Byte;
+ break;
+ }
+
+ case 0x7ff4:
+ {
+ unsigned char Temp;
+
+ Temp = OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200];
+ Temp = (Temp & ~(3 << OBC1_Shift)) | ((Byte & 3) << OBC1_Shift);
+ OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200] = Temp;
+ break;
+ }
+
+ case 0x7ff5:
+ {
+ if (Byte & 1)
+ OBC1_BasePtr = 0x1800;
+ else
+ OBC1_BasePtr = 0x1c00;
+
+ OBC1_RAM[0x1ff5] = Byte;
+ break;
+ }
+
+ case 0x7ff6:
+ {
+ OBC1_Address = Byte & 0x7f;
+ OBC1_Shift = (Byte & 3) << 1;
+ break;
+ }
+
+ default:
+ OBC1_RAM[Address & 0x1fff] = Byte;
+ break;
+ }
+}
+
+uint8 *GetBasePointerOBC1(uint32 Address)
+{
+ return Memory.FillRAM;
+}
+
+uint8 *GetMemPointerOBC1(uint32 Address)
+{
+ return (Memory.FillRAM + (Address & 0xffff));
+}
+
+void ResetOBC1()
+{
+ OBC1_Address = 0;
+ OBC1_BasePtr = 0x1c00;
+ OBC1_Shift = 0;
+ OBC1_RAM = &Memory.FillRAM[0x6000];
+
+ memset(OBC1_RAM, 0x00, 0x2000);
+}
+
+}