anago_scripts/mapper87.ad at master · nvsofts/anago_scripts · GitHub

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
/*
   iNES mapper 87
   Used in Goonies, etc.
   Detail: https://wiki.nesdev.com/w/index.php/INES_Mapper_087

   Attention: Not tested in 32KB CHR ROM!
 */

board <- {
  mappernum = 87,
  cpu_rom = {
    size_base = 0x8000, size_max = 0x8000
    banksize = 0x8000
  },
  ppu_rom= {
    size_base = 0x4000, size_max = 0x8000,
    banksize = 0x2000
  },
  ppu_ramfind = false, vram_mirrorfind = true
};

function cpu_dump(d, pagesize, banksize)
{
  cpu_read(d, 0x8000, 0x4000);
  cpu_read(d, 0xc000, 0x4000);
}

function ppu_dump(d, pagesize, banksize)
{
  for (local i = 0; i < pagesize; i++) {
    local low = i & 1;
    local high = (i & 2) ? 1 : 0;
    cpu_write(d, 0x6000, (low << 1) | high);
    ppu_read(d, 0, banksize);
  }
}