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This commit is contained in:
Lior Halphon 2020-04-25 23:26:17 +03:00
parent d1e3ad7790
commit 110cedeaac
1 changed files with 26 additions and 6 deletions
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30
Core/gb.c
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@ -484,16 +484,36 @@ done:;
// Fix a common wrong MBC error
if (gb->rom[0x147] == 3) { // MBC1 + RAM + Battery
if (gb->rom_size >= 33 * 0x4000) {
for (unsigned i = 32 * 0x4000; i < 33 * 0x4000; i++) {
bool needs_fix = false;
if (gb->rom_size >= 0x21 * 0x4000) {
for (unsigned i = 0x20 * 0x4000; i < 0x21 * 0x4000; i++) {
if (gb->rom[i]) {
needs_fix = true;
break;
}
}
}
if (!needs_fix && gb->rom_size >= 0x41 * 0x4000) {
for (unsigned i = 0x40 * 0x4000; i < 0x41 * 0x4000; i++) {
if (gb->rom[i]) {
needs_fix = true;
break;
}
}
}
if (!needs_fix && gb->rom_size >= 0x61 * 0x4000) {
for (unsigned i = 0x60 * 0x4000; i < 0x61 * 0x4000; i++) {
if (gb->rom[i]) {
needs_fix = true;
break;
}
}
}
if (needs_fix) {
gb->rom[0x147] = 0x10; // MBC3 + RTC + RAM + Battery
GB_configure_cart(gb);
gb->rom[0x147] = 0x3;
GB_log(gb, "ROM claims to use MBC1 but appears to require MBC3 or 5, assuming MBC3.\n");
break;
}
}
}
}