blob: 591ad027c1f4072ed0387eb5fd64918af3d48b53 (
plain)
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
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
/*===================================================================*/
/* */
/* Mapper 18 (Jaleco SS8806) */
/* */
/*===================================================================*/
BYTE Map18_Regs[11];
BYTE Map18_IRQ_Enable;
WORD Map18_IRQ_Latch;
WORD Map18_IRQ_Cnt;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 18 */
/*-------------------------------------------------------------------*/
void Map18_Init()
{
int i;
/* Initialize Mapper */
MapperInit = Map18_Init;
/* Write to Mapper */
MapperWrite = Map18_Write;
/* Write to SRAM */
MapperSram = Map0_Sram;
/* Write to APU */
MapperApu = Map0_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map18_HSync;
/* Callback at PPU */
MapperPPU = Map0_PPU;
/* Callback at Rendering Screen ( 1:BG, 0:Sprite ) */
MapperRenderScreen = Map0_RenderScreen;
/* Set SRAM Banks */
SRAMBANK = SRAM;
/* Set ROM Banks */
ROMBANK0 = ROMPAGE( 0 );
ROMBANK1 = ROMPAGE( 1 );
ROMBANK2 = ROMLASTPAGE( 1 );
ROMBANK3 = ROMLASTPAGE( 0 );
/* Initialize Regs */
for ( i = 0; i < sizeof( Map18_Regs ); i++ )
{
Map18_Regs[ i ] = 0;
}
Map18_IRQ_Enable = 0;
Map18_IRQ_Latch = 0;
Map18_IRQ_Cnt = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 18 Write Function */
/*-------------------------------------------------------------------*/
void Map18_Write( WORD wAddr, BYTE byData )
{
switch( wAddr )
{
/* Set ROM Banks */
case 0x8000:
Map18_Regs[ 0 ] = ( Map18_Regs[ 0 ] & 0xf0 ) | ( byData & 0x0f );
ROMBANK0 = ROMPAGE( Map18_Regs[ 0 ] % ( NesHeader.byRomSize << 1 ) );
break;
case 0x8001:
Map18_Regs[ 0 ] = ( Map18_Regs[ 0 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
ROMBANK0 = ROMPAGE( Map18_Regs[ 0 ] % ( NesHeader.byRomSize << 1 ) );
break;
case 0x8002:
Map18_Regs[ 1 ] = ( Map18_Regs[ 1 ] & 0xf0 ) | ( byData & 0x0f );
ROMBANK1 = ROMPAGE( Map18_Regs[ 1 ] % ( NesHeader.byRomSize << 1 ) );
break;
case 0x8003:
Map18_Regs[ 1 ] = ( Map18_Regs[ 1 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
ROMBANK1 = ROMPAGE( Map18_Regs[ 1 ] % ( NesHeader.byRomSize << 1 ) );
break;
case 0x9000:
Map18_Regs[ 2 ] = ( Map18_Regs[ 2 ] & 0xf0 ) | ( byData & 0x0f );
ROMBANK2 = ROMPAGE( Map18_Regs[ 2 ] % ( NesHeader.byRomSize << 1 ) );
break;
case 0x9001:
Map18_Regs[ 2 ] = ( Map18_Regs[ 2 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
ROMBANK2 = ROMPAGE( Map18_Regs[ 2 ] % ( NesHeader.byRomSize << 1 ) );
break;
/* Set PPU Banks */
case 0xA000:
Map18_Regs[ 3 ] = ( Map18_Regs[ 3 ] & 0xf0 ) | ( byData & 0x0f );
PPUBANK[ 0 ] = VROMPAGE( Map18_Regs[ 3 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xA001:
Map18_Regs[ 3 ] = ( Map18_Regs[ 3 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
PPUBANK[ 0 ] = VROMPAGE( Map18_Regs[ 3 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xA002:
Map18_Regs[ 4 ] = ( Map18_Regs[ 4 ] & 0xf0 ) | ( byData & 0x0f );
PPUBANK[ 1 ] = VROMPAGE( Map18_Regs[ 4 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xA003:
Map18_Regs[ 4 ] = ( Map18_Regs[ 4 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
PPUBANK[ 1 ] = VROMPAGE( Map18_Regs[ 4 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xB000:
Map18_Regs[ 5 ] = ( Map18_Regs[ 5 ] & 0xf0 ) | ( byData & 0x0f );
PPUBANK[ 2 ] = VROMPAGE( Map18_Regs[ 5 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xB001:
Map18_Regs[ 5 ] = ( Map18_Regs[ 5 ] &0x0f ) | ( ( byData & 0x0f ) << 4 );
PPUBANK[ 2 ] = VROMPAGE( Map18_Regs[ 5 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xB002:
Map18_Regs[ 6 ] = ( Map18_Regs[ 6 ] & 0xf0 ) | ( byData & 0x0f );
PPUBANK[ 3 ] = VROMPAGE( Map18_Regs[ 6 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xB003:
Map18_Regs[ 6 ] = ( Map18_Regs[ 6 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
PPUBANK[ 3 ] = VROMPAGE( Map18_Regs[ 6 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xC000:
Map18_Regs[ 7 ] = ( Map18_Regs[ 7 ] & 0xf0 ) | ( byData & 0x0f );
PPUBANK[ 4 ] = VROMPAGE( Map18_Regs[ 7 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xC001:
Map18_Regs[ 7 ] = ( Map18_Regs[ 7 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
PPUBANK[ 4 ] = VROMPAGE( Map18_Regs[ 7 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xC002:
Map18_Regs[ 8 ] = ( Map18_Regs[ 8 ] & 0xf0 ) | ( byData & 0x0f );
PPUBANK[ 5 ] = VROMPAGE( Map18_Regs[ 8 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xC003:
Map18_Regs[ 8 ] = ( Map18_Regs[ 8 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
PPUBANK[ 5 ] = VROMPAGE( Map18_Regs[ 8 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xD000:
Map18_Regs[ 9 ] = ( Map18_Regs[ 9 ] & 0xf0 ) | ( byData & 0x0f );
PPUBANK[ 6 ] = VROMPAGE( Map18_Regs[ 9 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xD001:
Map18_Regs[ 9 ] = ( Map18_Regs[ 9 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
PPUBANK[ 6 ] = VROMPAGE( Map18_Regs[ 9 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xD002:
Map18_Regs[ 10 ] = ( Map18_Regs[ 10 ] & 0xf0 ) | ( byData & 0x0f );
PPUBANK[ 7 ] = VROMPAGE( Map18_Regs[ 10 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xD003:
Map18_Regs[ 10 ] = ( Map18_Regs[ 10 ] & 0x0f ) | ( ( byData & 0x0f ) << 4 );
PPUBANK[ 7 ] = VROMPAGE( Map18_Regs[ 10 ] % ( NesHeader.byVRomSize << 3 ) );
InfoNES_SetupChr();
break;
case 0xE000:
Map18_IRQ_Latch = ( Map18_IRQ_Latch & 0xfff0 ) | ( byData & 0x0f );
break;
case 0xE001:
Map18_IRQ_Latch = ( Map18_IRQ_Latch & 0xff0f ) | ( ( byData & 0x0f ) << 4 );
break;
case 0xE002:
Map18_IRQ_Latch = ( Map18_IRQ_Latch & 0xf0ff ) | ( ( byData & 0x0f ) << 8 );
break;
case 0xE003:
Map18_IRQ_Latch = ( Map18_IRQ_Latch & 0x0fff ) | ( ( byData & 0x0f ) << 12 );
break;
case 0xF000:
if ( ( byData & 0x01 ) == 0 )
{
Map18_IRQ_Cnt = 0;
} else {
Map18_IRQ_Cnt = Map18_IRQ_Latch;
}
break;
case 0xF001:
Map18_IRQ_Enable = byData & 0x01;
break;
/* Name Table Mirroring */
case 0xF002:
switch ( byData & 0x03 )
{
case 0:
InfoNES_Mirroring( 0 ); /* Horizontal */
break;
case 1:
InfoNES_Mirroring( 1 ); /* Vertical */
break;
case 2:
InfoNES_Mirroring( 3 ); /* One Screen 0x2000 */
break;
}
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 18 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map18_HSync()
{
/*
* Callback at HSync
*
*/
if ( Map18_IRQ_Enable )
{
if ( Map18_IRQ_Cnt <= 113 )
{
IRQ_REQ;
Map18_IRQ_Cnt = 0;
Map18_IRQ_Enable = 0;
} else {
Map18_IRQ_Cnt -= 113;
}
}
}
|
