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Makes attempt to support 48kb ROMs.

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This commit is contained in:
Thomas Harte 2018-01-01 11:25:27 -05:00
parent 34db35b500
commit 250f7bf6b0
1 changed files with 16 additions and 7 deletions
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23
StaticAnalyser/MSX/StaticAnalyser.cpp
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@ -39,18 +39,27 @@ static std::list<std::shared_ptr<Storage::Cartridge::Cartridge>>
const size_t data_size = segment.data.size();
if(data_size < 0x2000 || data_size & 0x3fff) continue;
// Check for a ROM header at address 0; TODO: if it's not found then try 0x4000
// and consider swapping the image.
// Check for a ROM header at address 0; if it's not found then try 0x4000
// and adjust the start address;
uint16_t start_address = 0;
bool found_start = false;
if(segment.data[0] == 0x41 && segment.data[1] == 0x42) {
start_address = 0x4000;
found_start = true;
} else if(segment.data.size() >= 0x8000 && segment.data[0x4000] == 0x41 && segment.data[0x4001] == 0x42) {
start_address = 0;
found_start = true;
}
// Check for the expansion ROM header and the reserved bytes.
if(segment.data[0] != 0x41 || segment.data[1] != 0x42) continue;
// Reject cartridge if the ROM header wasn't found.
if(!found_start) continue;
uint16_t init_address = static_cast<uint16_t>(segment.data[2] | (segment.data[3] << 8));
// TODO: check for a rational init address?
// If this ROM is greater than 32kb in size then some sort of MegaROM scheme must
// If this ROM is greater than 48kb in size then some sort of MegaROM scheme must
// be at play; disassemble to try to figure it out.
if(data_size > 0x4000) {
if(data_size > 0xc000) {
std::vector<uint8_t> first_segment;
first_segment.insert(first_segment.begin(), segment.data.begin(), segment.data.begin() + 32768);
StaticAnalyser::Z80::Disassembly disassembly =
@ -87,7 +96,7 @@ static std::list<std::shared_ptr<Storage::Cartridge::Cartridge>>
// Apply the standard MSX start address.
msx_cartridges.emplace_back(new Storage::Cartridge::Cartridge({
Storage::Cartridge::Cartridge::Segment(0x4000, segment.data)
Storage::Cartridge::Cartridge::Segment(start_address, segment.data)
}));
}