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Implemented single density version of format track.

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This commit is contained in:
Thomas Harte 2017-08-14 13:03:17 -04:00
parent 0da02d3902
commit 7b8bb0297a
1 changed files with 37 additions and 35 deletions
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72
Components/8272/i8272.cpp
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@ -531,32 +531,32 @@ void i8272::posit_event(int event_type) {
begin_writing();
// Write start-of-track.
// TODO: single density.
for(int c = 0; c < 80; c++) {
write_byte(0x4e);
}
for(int c = 0; c < 12; c++) {
write_byte(0x00);
}
for(int c = 0; c < 3; c++) {
write_raw_short(Storage::Encodings::MFM::MFMIndexSync);
}
write_byte(Storage::Encodings::MFM::IndexAddressByte);
for(int c = 0; c < 50; c++) {
write_byte(0x4e);
if(get_is_double_density()) {
for(int c = 0; c < 80; c++) write_byte(0x4e);
for(int c = 0; c < 12; c++) write_byte(0x00);
for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMIndexSync);
write_byte(Storage::Encodings::MFM::IndexAddressByte);
for(int c = 0; c < 50; c++) write_byte(0x4e);
} else {
for(int c = 0; c < 40; c++) write_byte(0xff);
for(int c = 0; c < 6; c++) write_byte(0x00);
write_raw_short(Storage::Encodings::MFM::FMIndexAddressMark);
for(int c = 0; c < 26; c++) write_byte(0xff);
}
WAIT_FOR_EVENT(Event::DataWritten);
sector_ = 0;
format_track_write_sector:
for(int c = 0; c < 12; c++) {
write_byte(0x00);
if(get_is_double_density()) {
for(int c = 0; c < 12; c++) write_byte(0x00);
for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMSync);
get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
write_byte(Storage::Encodings::MFM::IDAddressByte);
} else {
for(int c = 0; c < 6; c++) write_byte(0x00);
get_crc_generator().reset();
write_raw_short(Storage::Encodings::MFM::FMIDAddressMark);
}
for(int c = 0; c < 3; c++) {
write_raw_short(Storage::Encodings::MFM::MFMSync);
}
get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
write_byte(Storage::Encodings::MFM::IDAddressByte);
// Write the sector header, obtaining its contents
// from the processor.
@ -578,36 +578,38 @@ void i8272::posit_event(int event_type) {
write_crc();
// Write the sector body.
for(int c = 0; c < 22; c++) {
write_byte(0x4e);
if(get_is_double_density()) {
for(int c = 0; c < 22; c++) write_byte(0x4e);
for(int c = 0; c < 12; c++) write_byte(0x00);
for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMSync);
get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
write_byte(Storage::Encodings::MFM::DataAddressByte);
} else {
for(int c = 0; c < 11; c++) write_byte(0xff);
for(int c = 0; c < 6; c++) write_byte(0x00);
get_crc_generator().reset();
write_raw_short(Storage::Encodings::MFM::FMDataAddressMark);
}
for(int c = 0; c < 12; c++) {
write_byte(0x00);
}
for(int c = 0; c < 3; c++) {
write_raw_short(Storage::Encodings::MFM::MFMSync);
}
get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
write_byte(Storage::Encodings::MFM::DataAddressByte);
for(int c = 0; c < (128 << command_[2]); c++) {
write_byte(command_[5]);
}
write_crc();
// Write the prescribed gap.
for(int c = 0; c < command_[4]; c++) {
write_byte(0x4e);
if(get_is_double_density()) {
for(int c = 0; c < command_[4]; c++) write_byte(0x4e);
} else {
for(int c = 0; c < command_[4]; c++) write_byte(0xff);
}
// Consider repeating.
sector_++;
if(sector_ < command_[3]) {
if(sector_ < command_[3])
goto format_track_write_sector;
}
// Otherwise, pad out to the index hole.
format_track_pad:
write_byte(0x4e);
write_byte(get_is_double_density() ? 0x4e : 0xff);
WAIT_FOR_EVENT((int)Event::DataWritten | (int)Event::IndexHole);
if(event_type != (int)Event::IndexHole) goto format_track_pad;