blob: d8ecddd608d88ae7520bce83403b558c0d1aa558 (
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
|
/*===================================================================*/
/* */
/* Mapper 67 (Sunsoft Mapper #3) */
/* */
/*===================================================================*/
BYTE Map67_IRQ_Enable;
BYTE Map67_IRQ_Cnt;
BYTE Map67_IRQ_Latch;
/*-------------------------------------------------------------------*/
/* Initialize Mapper 67 */
/*-------------------------------------------------------------------*/
void Map67_Init()
{
/* Initialize Mapper */
MapperInit = Map67_Init;
/* Write to Mapper */
MapperWrite = Map67_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 = Map67_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 );
/* Set PPU Banks */
PPUBANK[ 0 ] = VROMPAGE( 0 );
PPUBANK[ 1 ] = VROMPAGE( 1 );
PPUBANK[ 2 ] = VROMPAGE( 2 );
PPUBANK[ 3 ] = VROMPAGE( 3 );
PPUBANK[ 4 ] = VROMPAGE( ( NesHeader.byVRomSize << 3 ) - 4 );
PPUBANK[ 5 ] = VROMPAGE( ( NesHeader.byVRomSize << 3 ) - 3 );
PPUBANK[ 6 ] = VROMPAGE( ( NesHeader.byVRomSize << 3 ) - 2 );
PPUBANK[ 7 ] = VROMPAGE( ( NesHeader.byVRomSize << 3 ) - 1 );
InfoNES_SetupChr();
/* Initialize IRQ Registers */
Map67_IRQ_Enable = 0;
Map67_IRQ_Cnt = 0;
Map67_IRQ_Latch = 0;
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 67 Write Function */
/*-------------------------------------------------------------------*/
void Map67_Write( WORD wAddr, BYTE byData )
{
switch ( wAddr & 0xf800 )
{
/* Set PPU Banks */
case 0x8800:
byData <<= 1;
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 0 ] = VROMPAGE( byData + 0 );
PPUBANK[ 1 ] = VROMPAGE( byData + 1 );
InfoNES_SetupChr();
break;
case 0x9800:
byData <<= 1;
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 2 ] = VROMPAGE( byData + 0 );
PPUBANK[ 3 ] = VROMPAGE( byData + 1 );
InfoNES_SetupChr();
break;
case 0xa800:
byData <<= 1;
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 4 ] = VROMPAGE( byData + 0 );
PPUBANK[ 5 ] = VROMPAGE( byData + 1 );
InfoNES_SetupChr();
break;
case 0xb800:
byData <<= 1;
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 6 ] = VROMPAGE( byData + 0 );
PPUBANK[ 7 ] = VROMPAGE( byData + 1 );
InfoNES_SetupChr();
break;
case 0xc800:
Map67_IRQ_Cnt = Map67_IRQ_Latch;
Map67_IRQ_Latch = byData;
break;
case 0xd800:
Map67_IRQ_Enable = byData & 0x10;
break;
case 0xe800:
switch ( byData & 0x03 )
{
case 0:
InfoNES_Mirroring( 1 );
break;
case 1:
InfoNES_Mirroring( 0 );
break;
case 2:
InfoNES_Mirroring( 3 );
break;
case 3:
InfoNES_Mirroring( 2 );
break;
}
break;
/* Set ROM Banks */
case 0xf800:
byData <<= 1;
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK0 = ROMPAGE( byData + 0 );
ROMBANK1 = ROMPAGE( byData + 1 );
break;
}
}
/*-------------------------------------------------------------------*/
/* Mapper 67 H-Sync Function */
/*-------------------------------------------------------------------*/
void Map67_HSync()
{
/*
* Callback at HSync
*
*/
if ( Map67_IRQ_Enable )
{
if ( /* 0 <= PPU_Scanline && */ PPU_Scanline <= 239 )
{
if ( PPU_R1 & R1_SHOW_SCR || PPU_R1 & R1_SHOW_SP )
{
if ( --Map67_IRQ_Cnt == 0xf6 )
{
Map67_IRQ_Cnt = Map67_IRQ_Latch;
IRQ_REQ;
}
}
}
}
}
|
