blob: d990d4c36711ff3bddc59db2df086f15ffb55e55 (
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
|
/*===================================================================*/
/* */
/* Mapper 34 (Nina-1) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Initialize Mapper 34 */
/*-------------------------------------------------------------------*/
void Map34_Init()
{
int nPage;
/* Initialize Mapper */
MapperInit = Map34_Init;
/* Write to Mapper */
MapperWrite = Map34_Write;
/* Write to SRAM */
MapperSram = Map34_Sram;
/* Write to APU */
MapperApu = Map0_Apu;
/* Read from APU */
MapperReadApu = Map0_ReadApu;
/* Callback at VSync */
MapperVSync = Map0_VSync;
/* Callback at HSync */
MapperHSync = Map0_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 */
if ( NesHeader.byVRomSize > 0 )
{
for ( nPage = 0; nPage < 8; ++nPage )
PPUBANK[ nPage ] = VROMPAGE( nPage );
InfoNES_SetupChr();
}
/* Set up wiring of the interrupt pin */
K6502_Set_Int_Wiring( 1, 1 );
}
/*-------------------------------------------------------------------*/
/* Mapper 34 Write Function */
/*-------------------------------------------------------------------*/
void Map34_Write( WORD wAddr, BYTE byData )
{
/* Set ROM Banks */
byData <<= 2;
byData %= ( NesHeader.byRomSize << 1);
ROMBANK0 = ROMPAGE( byData );
ROMBANK1 = ROMPAGE( byData + 1 );
ROMBANK2 = ROMPAGE( byData + 2 );
ROMBANK3 = ROMPAGE( byData + 3 );
}
/*-------------------------------------------------------------------*/
/* Mapper 34 Write to SRAM Function */
/*-------------------------------------------------------------------*/
void Map34_Sram( WORD wAddr, BYTE byData )
{
switch(wAddr)
{
/* Set ROM Banks */
case 0x7ffd:
byData <<= 2;
byData %= ( NesHeader.byRomSize << 1 );
ROMBANK0 = ROMPAGE( byData );
ROMBANK1 = ROMPAGE( byData + 1 );
ROMBANK2 = ROMPAGE( byData + 2 );
ROMBANK3 = ROMPAGE( byData + 3 );
break;
/* Set PPU Banks */
case 0x7ffe:
byData <<= 2;
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 0 ] = VROMPAGE( byData );
PPUBANK[ 1 ] = VROMPAGE( byData + 1 );
PPUBANK[ 2 ] = VROMPAGE( byData + 2 );
PPUBANK[ 3 ] = VROMPAGE( byData + 3 );
InfoNES_SetupChr();
break;
/* Set PPU Banks */
case 0x7fff:
byData <<= 2;
byData %= ( NesHeader.byVRomSize << 3 );
PPUBANK[ 4 ] = VROMPAGE( byData );
PPUBANK[ 5 ] = VROMPAGE( byData + 1 );
PPUBANK[ 6 ] = VROMPAGE( byData + 2 );
PPUBANK[ 7 ] = VROMPAGE( byData + 3 );
InfoNES_SetupChr();
break;
}
}
|
