private void DumpTrack(int cylinder, int head)
{
SA1000Drive drive = _system.HardDrive;
int sector = 0;
int wordIndex = 0;
uint data = 0;
List <uint> sectorData = new List <uint>();
// Print lead-in to first sector
while (wordIndex < drive.WordsPerTrack)
{
data = drive.DebugRead(cylinder, head, wordIndex);
wordIndex++;
if (data == 0x1a141)
{
break;
}
else
{
sectorData.Add(data);
}
}
WriteLine("Lead-in to sector 0:");
PrintSectorData(sectorData);
sectorData.Clear();
// Print sector data
while (wordIndex < drive.WordsPerTrack)
{
data = drive.DebugRead(cylinder, head, wordIndex);
wordIndex++;
if (data == 0x1a141 || wordIndex == drive.WordsPerTrack - 1)
{
WriteLine(String.Format("Sector {0}:", sector));
PrintSectorData(sectorData);
sectorData.Clear();
sector++;
}
else
{
sectorData.Add(data);
}
}
}
public DSystem()
{
_scheduler = new Scheduler();
_cp = new CentralProcessor(this);
_iop = new IOProcessor(this);
_memoryController = new MemoryController();
_displayController = new DisplayController(this);
_hardDrive = new SA1000Drive(this);
_shugartController = new ShugartController(this, _hardDrive);
_ethernetController = new EthernetController(this);
try
{
_frameTimer = new FrameTimer(38.7);
}
catch
{
// Not supported on this platform.
_frameTimer = null;
}
}
private void AnalyzeDisk()
{
SA1000Drive drive = _system.HardDrive;
WriteLine(String.Format("Drive is type {0}", drive.Type));
for (int cylinder = 0; cylinder < drive.Geometry.Cylinders; cylinder++)
{
for (int head = 0; head < drive.Geometry.Heads; head++)
{
int sector = -1;
int field = 0;
for (int word = 0; word < drive.WordsPerTrack; word++)
{
//
// Walk the track, looking for sector marks.
// There should be 16 sets of:
// - Header mark
// - Label mark
// - Data mark
// - CRC mark
// In exactly that order
//
// Verify the header data
//
uint data = drive.DebugRead(cylinder, head, word);
bool isAddressMark = (data & 0x10000) != 0;
bool isCRC = (data & 0x20000) != 0;
switch (field)
{
case 0:
if (data == 0x1a141) // header
{
// This is the header mark, increment the sector count
// move to next field.
sector++;
field++;
}
else if (data == 0x1a143) // label / data
{
// Unexpected here.
WriteLine(String.Format("Unexpected label/data mark before header mark at c/h/s (w) {0}/{1}/{2} ({3})",
cylinder,
head,
sector,
word));
}
else if (data == 0x2beef)
{
/*
* // Unexpected here.
* WriteLine(String.Format("Unexpected CRC before header mark at c/h/s (w) {0}/{1}/{2} ({3})",
* cylinder,
* head,
* sector,
* word)); */
}
break;
case 1:
if (data == 0x1a143) // label / data
{
// This is the label mark, move to next field.
field++;
}
else if (data == 0x1a141) // header
{
// Unexpected header mark here.
WriteLine(String.Format("Unexpected header mark after header mark at c/h/s (w) {0}/{1}/{2} ({3})",
cylinder,
head,
sector,
word));
}
else if (data == 0x2beef)
{
/*
* // Unexpected here.
* WriteLine(String.Format("Unexpected CRC after header mark at c/h/s (w) {0}/{1}/{2} ({3})",
* cylinder,
* head,
* sector,
* word)); */
}
break;
case 2:
if (data == 0x1a143) // label / data
{
// This is the data mark, move to CRC.
field++;
}
else if (data == 0x1a141) // header
{
// Unexpected header mark here.
WriteLine(String.Format("Unexpected header mark after label mark at c/h/s (w) {0}/{1}/{2} ({3})",
cylinder,
head,
sector,
word));
}
else if (data == 0x2beef)
{
/*
* // Unexpected here.
* WriteLine(String.Format("Unexpected CRC after label mark at c/h/s (w) {0}/{1}/{2} ({3})",
* cylinder,
* head,
* sector,
* word)); */
}
break;
case 3:
if (data == 0x2beef) // CRC
{
// This is the CRC, move back to header state.
field = 0;
}
else if (isAddressMark)
{
// Unexpected header mark here.
WriteLine(String.Format("Unexpected address mark after data mark at c/h/s (w) {0}/{1}/{2} ({3})",
cylinder,
head,
sector,
word));
}
break;
}
}
// Check sector count. Should be 15.
if (sector != 15)
{
WriteLine(String.Format("Unexpected sector count {0} at c/h {1}/{2}",
sector,
cylinder,
head));
}
}
}
}
