void BootGame()
{
_disk = new DiskImage(diskImageName);
// No filename, open first file in directory
FileHandle bootFile = _disk.OpenFile(null);
if (bootFile != null)
{
ushort loadAddress = (ushort)(_disk.ReadByte(bootFile) + _disk.ReadByte(bootFile) * 256);
ushort address = loadAddress;
while (bootFile.Open)
{
_ram[address++] = _disk.ReadByte(bootFile);
}
// Set end address on zero page
_ram[0x2d] = (byte)(address & 0xff);
_ram[0x2e] = (byte)(address >> 8);
_ram[0xae] = (byte)(address & 0xff);
_ram[0xaf] = (byte)(address >> 8);
// Set RESET vector to CLALL (autostart), otherwise assume sys2061
if (loadAddress <= 0x32c)
{
_ram[0xfffc] = _ram[0x32c];
_ram[0xfffd] = _ram[0x32d];
}
else
{
_ram[0xfffc] = 0xd;
_ram[0xfffd] = 0x8;
}
}
}
void HandleKernalTrap(ushort address)
{
// SETNAM
if (address == 0xffbd)
{
//Debug.Log("SetNam");
// Strip away @0:
byte fileNameLength = _processor.A;
ushort fileNameAddress = (ushort)(_processor.Y * 256 + _processor.X);
if (_ram[fileNameAddress] == 0x40 && _ram[(ushort)(fileNameAddress + 1)] == 0x30)
{
fileNameAddress += 3;
fileNameLength -= 3;
}
_fileName = new byte[fileNameLength];
for (int i = 0; i < _fileName.Length; ++i)
{
_fileName[i] = _ram[fileNameAddress++];
}
}
// CHKIN (actually open the file stream)
else if (address == 0xffc6)
{
//Debug.Log("Chkin");
_fileHandle = _disk.OpenFile(_fileName);
if (_fileHandle == null)
{
Debug.LogWarning("File " + _fileName[0].ToString("X") + " " + _fileName[1].ToString("X") + " not found");
}
}
// CHRIN
else if (address == 0xffcf)
{
if (_fileHandle != null)
{
if (_fileHandle.Open)
{
_processor.A = _disk.ReadByte(_fileHandle);
}
_ram[0x90] = (byte)(_fileHandle.Open ? 0x00 : 0x40);
}
else
{
_ram[0x90] = 0x42; // EOF, file not found
}
}
// CHKOUT
else if (address == 0xffc9)
{
_fileHandle = _disk.OpenFileForWrite(_fileName);
if (_fileHandle == null)
{
Debug.LogError("File " + _fileName[0].ToString("X") + " " + _fileName[1].ToString("X") + " failed to open for write");
}
}
// CHROUT
else if (address == 0xffd2)
{
if (_fileHandle != null)
{
_disk.WriteByte(_fileHandle, _processor.A);
}
}
// CLOSE
else if (address == 0xffc3)
{
//Debug.Log("Close");
if (_fileHandle != null)
{
_fileHandle.Close();
}
_fileHandle = null;
}
// CIOUT - loader detection
else if (address == 0xffa8)
{
//Debug.Log("CIOut");
_ram[0x90] = 0x80; // Error, prevent fastloader from running
}
}