1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/****************************************************
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;
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);
}
|
