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Wrapping external RAM banking support. Required for Pokémon Pinball's saves.

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This commit is contained in:
Lior Halphon 2016-03-30 23:33:32 +03:00
parent ec8823e620
commit e822f17bb7
1 changed files with 4 additions and 0 deletions
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4
Core/memory.c
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@ -234,6 +234,10 @@ static void write_mbc(GB_gameboy_t *gb, unsigned short addr, unsigned char value
} }
else { else {
gb->mbc_ram_bank = value; gb->mbc_ram_bank = value;
/* Some games assume banks wrap around. We can do this if RAM size is a power of two */
if (gb->mbc_ram_bank >= gb->mbc_ram_size / 0x2000 && (gb->mbc_ram_size & (gb->mbc_ram_size - 1)) == 0 && gb->mbc_ram_size != 0) {
gb->mbc_ram_bank %= gb->mbc_ram_size / 0x2000;
}
} }
break; break;
case 6: case 6: