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Allow writes to the $a000-$bfff range in the MBC block

This commit is contained in:
Lior Halphon 2021-04-13 16:01:44 +03:00
parent 6ee488688b
commit dfdbff7304
2 changed files with 3 additions and 2 deletions
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2
BESS.md
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@ -132,7 +132,7 @@ This block contains an MBC-specific number of 3-byte-long pairs that represent t
| 0x9 | The value 0x4000 as a 16-bit integer |
| 0xB | The current RAM bank |
An implementation should parse this block as a series of writes to be made. Values outside the `0x0000-0x7FFF` range are not allowed.
An implementation should parse this block as a series of writes to be made. Values outside the `0x0000-0x7FFF` and `0xA000-0xBFFF` ranges are not allowed.
#### RTC block
The RTC block uses the `'RTC '` identifier, and is an optional block that is used while emulating an MBC3 with an RTC. The contents of this block are identical to 64-bit RTC saves from VBA, which are also used by SameBoy and different emulators such as BGB.

3
Core/save_state.c
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@ -916,7 +916,8 @@ static int load_bess_save(GB_gameboy_t *gb, virtual_file_t *file, bool is_samebo
for (unsigned i = LE32(block.size); i > 0; i -= 3) {
BESS_MBC_pair_t pair;
file->read(file, &pair, sizeof(pair));
if (LE16(pair.address) >= 0x8000) goto parse_error;
if (LE16(pair.address) >= 0x8000 && LE16(pair.address) < 0xA000) goto parse_error;
if (LE16(pair.address) >= 0xC000) goto parse_error;
GB_write_memory(&save, LE16(pair.address), pair.value);
}
break;