blob: 079fb0be52021bda7edd3b8a1e52ee3c5ae18501 (
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
|
static uint8_t mapper_002_2_prg_read(struct nes_state *state, uint32_t addr) {
struct mapper_002_2 *mapper = (struct mapper_002_2 *)&state->map;
if(addr >= 0x8000 && addr < 0xc000) {
return mapper->prg_bank0[addr & 0x3fff];
} else if(addr >= 0xc000) {
return mapper->prg_bank1[addr & 0x3fff];
}
return 0;
}
static void mapper_002_2_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) {
struct mapper_002_2 *mapper = (struct mapper_002_2 *)&state->map;
if(addr >= 0x8000) {
mapper->prg_bank0 = state->prg_rom + ((value & 0x0f) * 0x4000);
}
}
static uint8_t mapper_002_2_chr_read(struct nes_state *state, uint32_t addr) {
return state->chr_ram[addr];
}
static void mapper_002_2_chr_write(struct nes_state *state, uint32_t addr, uint8_t value) {
state->chr_ram[addr] = value;
}
static void mapper_002_2_init(struct nes_state *state) {
struct mapper_002_2 *mapper = (struct mapper_002_2 *)&state->map;
mapper->prg_bank0 = state->prg_rom;
mapper->prg_bank1 = state->prg_rom + state->ines.prg_size - 0x4000;
state->mapper.prg_read = mapper_002_2_prg_read;
state->mapper.prg_write = mapper_002_2_prg_write;
state->mapper.chr_read = mapper_002_2_chr_read;
state->mapper.chr_write = mapper_002_2_chr_write;
}
|
