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Add some notes to self (now and future).

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This commit is contained in:
Thomas Harte 2023-12-05 12:50:53 -05:00
parent 7ca9a0841f
commit 40de0189d9
1 changed files with 8 additions and 4 deletions
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12
Analyser/Static/FAT12/StaticAnalyser.cpp
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@ -32,7 +32,7 @@ Analyser::Static::TargetList Analyser::Static::FAT12::GetTargets(const Media &me
// //
// (though the MSX and Atari ST don't currently call in here for now) // (though the MSX and Atari ST don't currently call in here for now)
// If the disk image is very small, map it to the PC. That's the only option old enough // If the disk image is very small or large, map it to the PC. That's the only option old enough
// to have used 5.25" media. // to have used 5.25" media.
if(disk->get_maximum_head_position() <= Storage::Disk::HeadPosition(40)) { if(disk->get_maximum_head_position() <= Storage::Disk::HeadPosition(40)) {
return Analyser::Static::PCCompatible::GetTargets(media, file_name, platforms); return Analyser::Static::PCCompatible::GetTargets(media, file_name, platforms);
@ -46,8 +46,8 @@ Analyser::Static::TargetList Analyser::Static::FAT12::GetTargets(const Media &me
Storage::Encodings::MFM::MFMBitLength Storage::Encodings::MFM::MFMBitLength
), true); ), true);
// If no sectors were found, assume this disk was single density, which also implies the PC. // If no sectors were found, assume this disk was either single density or high density, which both imply the PC.
if(sector_map.empty()) { if(sector_map.empty() || sector_map.size() > 10) {
return Analyser::Static::PCCompatible::GetTargets(media, file_name, platforms); return Analyser::Static::PCCompatible::GetTargets(media, file_name, platforms);
} }
@ -67,8 +67,10 @@ Analyser::Static::TargetList Analyser::Static::FAT12::GetTargets(const Media &me
// Check for key phrases that imply a PC disk. // Check for key phrases that imply a PC disk.
const auto &sample = boot_sector->samples[0]; const auto &sample = boot_sector->samples[0];
const std::vector<std::string> pc_strings = { const std::vector<std::string> pc_strings = {
// MS-DOS strings.
"MSDOS", "MSDOS",
"Non-System disk or disk error", "Non-System disk or disk error",
// DOS Plus strings.
"Insert a SYSTEM disk", "Insert a SYSTEM disk",
}; };
for(const auto &string: pc_strings) { for(const auto &string: pc_strings) {
@ -79,7 +81,9 @@ Analyser::Static::TargetList Analyser::Static::FAT12::GetTargets(const Media &me
} }
} }
// TODO: attempt disassembly as 8086. // TODO: look for a COM, EXE or BAT, inspect. AUTOEXEC.BAT and/or CONFIG.SYS could be either PC or MSX.
// Disassembling the boot sector doesn't necessarily work, as several Enterprise titles seem to have been
// imaged, or possibly created, by WINIMAGE which adds a PC-style boot sector.
// Being unable to prove that this is a PC disk, throw it to the Enterprise. // Being unable to prove that this is a PC disk, throw it to the Enterprise.
return Analyser::Static::Enterprise::GetTargets(media, file_name, platforms); return Analyser::Static::Enterprise::GetTargets(media, file_name, platforms);