143 lines
2.9 KiB
C
143 lines
2.9 KiB
C
/*
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Copyright (C) 1997-2007 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
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http://www.zsnes.com
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http://sourceforge.net/projects/zsnes
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https://zsnes.bountysource.com
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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typedef unsigned char bool8;
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typedef unsigned char uint8;
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typedef unsigned short uint16;
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typedef unsigned int uint32;
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typedef char int8;
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typedef short int16;
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typedef long int32;
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//C++ in C
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typedef unsigned char bool;
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#define true 1
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#define false 0
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static uint8 *OBC1_RAM = 0;
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int OBC1_Address;
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int OBC1_BasePtr;
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int OBC1_Shift;
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uint16 obc1_address;
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uint8 obc1_byte;
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void GetOBC1 ()
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{
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switch(obc1_address) {
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case 0x7ff0:
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obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2)];
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break;
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case 0x7ff1:
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obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 1];
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break;
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case 0x7ff2:
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obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 2];
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break;
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case 0x7ff3:
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obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 3];
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break;
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case 0x7ff4:
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obc1_byte = OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200];
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break;
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default:
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obc1_byte = OBC1_RAM[obc1_address & 0x1fff];
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}
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}
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void SetOBC1 ()
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{
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switch(obc1_address) {
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case 0x7ff0:
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{
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OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2)] = obc1_byte;
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break;
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}
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case 0x7ff1:
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{
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OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 1] = obc1_byte;
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break;
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}
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case 0x7ff2:
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{
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OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 2] = obc1_byte;
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break;
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}
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case 0x7ff3:
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{
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OBC1_RAM[OBC1_BasePtr + (OBC1_Address << 2) + 3] = obc1_byte;
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break;
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}
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case 0x7ff4:
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{
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unsigned char Temp;
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Temp = OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200];
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Temp = (Temp & ~(3 << OBC1_Shift)) | ((obc1_byte & 3) << OBC1_Shift);
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OBC1_RAM[OBC1_BasePtr + (OBC1_Address >> 2) + 0x200] = Temp;
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break;
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}
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case 0x7ff5:
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{
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if (obc1_byte & 1)
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OBC1_BasePtr = 0x1800;
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else
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OBC1_BasePtr = 0x1c00;
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break;
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}
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case 0x7ff6:
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{
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OBC1_Address = obc1_byte & 0x7f;
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OBC1_Shift = (obc1_byte & 3) << 1;
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break;
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}
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}
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OBC1_RAM[obc1_address & 0x1fff] = obc1_byte;
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}
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extern unsigned char *romdata;
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void InitOBC1()
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{
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OBC1_RAM = romdata+0x400000;
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if (OBC1_RAM[0x1ff5] & 1)
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OBC1_BasePtr = 0x1800;
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else
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OBC1_BasePtr = 0x1c00;
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OBC1_Address = OBC1_RAM[0x1ff6] & 0x7f;
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OBC1_Shift = (OBC1_RAM[0x1ff6] & 3) << 1;
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}
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