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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
//============================================================================
//
// SSSS tt lll lll
// SS SS tt ll ll
// SS tttttt eeee ll ll aaaa
// SSSS tt ee ee ll ll aa
// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
// SS SS tt ee ll ll aa aa
// SSSS ttt eeeee llll llll aaaaa
//
// Copyright (c) 1995-2007 by Bradford W. Mott and the Stella team
//
// See the file "license" for information on usage and redistribution of
// this file, and for a DISCLAIMER OF ALL WARRANTIES.
//
// $Id: CartMB.cxx,v 1.11 2007/01/14 16:17:55 stephena Exp $
//============================================================================
#include <cassert>
#include "System.hxx"
#include "Serializer.hxx"
#include "Deserializer.hxx"
#include "CartMB.hxx"
using namespace std;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
CartridgeMB::CartridgeMB(const uInt8* image)
{
// Copy the ROM image into my buffer
for(uInt32 addr = 0; addr < 65536; ++addr)
{
myImage[addr] = image[addr];
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
CartridgeMB::~CartridgeMB()
{
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
const char* CartridgeMB::name() const
{
return "CartridgeMB";
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void CartridgeMB::reset()
{
// Upon reset we switch to bank 1
myCurrentBank = 0;
incbank();
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void CartridgeMB::install(System& system)
{
mySystem = &system;
uInt16 shift = mySystem->pageShift();
uInt16 mask = mySystem->pageMask();
// Make sure the system we're being installed in has a page size that'll work
assert((0x1000 & mask) == 0);
// Set the page accessing methods for the hot spots
System::PageAccess access;
for(uInt32 i = (0x1FF0 & ~mask); i < 0x2000; i += (1 << shift))
{
access.directPeekBase = 0;
access.directPokeBase = 0;
access.device = this;
mySystem->setPageAccess(i >> shift, access);
}
// Install pages for bank 1
myCurrentBank = 0;
incbank();
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
uInt8 CartridgeMB::peek(uInt16 address)
{
address = address & 0x0FFF;
// Switch to next bank
if(address == 0x0FF0) incbank();
return myImage[myCurrentBank * 4096 + address];
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void CartridgeMB::poke(uInt16 address, uInt8)
{
address = address & 0x0FFF;
// Switch to next bank
if(address == 0x0FF0) incbank();
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void CartridgeMB::incbank()
{
if(bankLocked) return;
// Remember what bank we're in
myCurrentBank ++;
myCurrentBank &= 0x0F;
uInt16 offset = myCurrentBank * 4096;
uInt16 shift = mySystem->pageShift();
uInt16 mask = mySystem->pageMask();
// Setup the page access methods for the current bank
System::PageAccess access;
access.device = this;
access.directPokeBase = 0;
// Map ROM image into the system
for(uInt32 address = 0x1000; address < (0x1FF0U & ~mask);
address += (1 << shift))
{
access.directPeekBase = &myImage[offset + (address & 0x0FFF)];
mySystem->setPageAccess(address >> shift, access);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool CartridgeMB::save(Serializer& out)
{
string cart = name();
try
{
out.putString(cart);
out.putInt(myCurrentBank);
}
catch(const char* msg)
{
ale::Logger::Error << msg << endl;
return false;
}
catch(...)
{
ale::Logger::Error << "Unknown error in save state for " << cart << endl;
return false;
}
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool CartridgeMB::load(Deserializer& in)
{
string cart = name();
try
{
if(in.getString() != cart)
return false;
myCurrentBank = (uInt16) in.getInt();
}
catch(const char* msg)
{
ale::Logger::Error << msg << endl;
return false;
}
catch(...)
{
ale::Logger::Error << "Unknown error in load state for " << cart << endl;
return false;
}
// Remember what bank we were in
--myCurrentBank;
incbank();
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void CartridgeMB::bank(uInt16 bank)
{
if(bankLocked) return;
myCurrentBank = (bank - 1);
incbank();
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
int CartridgeMB::bank()
{
return myCurrentBank;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
int CartridgeMB::bankCount()
{
return 16;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool CartridgeMB::patch(uInt16 address, uInt8 value)
{
address = address & 0x0FFF;
myImage[myCurrentBank * 4096 + address] = value;
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
uInt8* CartridgeMB::getImage(int& size)
{
size = 65536;
return &myImage[0];
}