/// <summary>
/// eject the loaded disk
/// </summary>
public void Eject()
{
disk = null;
state = RamAdapterState.IDLE;
SetCycles();
//Console.WriteLine("FDS: Disk ejected");
DriveLightCallback?.Invoke(false);
}
/// <summary>
/// clock at ~5.37mhz
/// </summary>
public void Clock()
{
cycleswaiting--;
if (cycleswaiting == 0)
{
switch (state)
{
case RamAdapterState.RUNNING:
if (transferreset) // run head to end of disk
{
MoveDummy();
}
else if ((cached4025 & 4) != 0) // read mode
{
Read();
}
else
{
Write();
}
if (diskpos >= disksize)
{
//Console.WriteLine("FDS: End of Disk");
state = RamAdapterState.RESET;
//transferreset = false;
//numcrc = 0;
DriveLightCallback?.Invoke(false);
}
SetCycles();
break;
case RamAdapterState.RESET:
case RamAdapterState.INSERTING:
state = RamAdapterState.IDLE;
diskpos = 0;
SetCycles();
//transferreset = false;
//numcrc = 0;
//Console.WriteLine("FDS: Return or Insert Complete");
DriveLightCallback?.Invoke(false);
break;
case RamAdapterState.SPINUP:
state = RamAdapterState.RUNNING;
SetCycles();
//transferreset = false; // this definitely does not happen.
// Console.WriteLine("FDS: Spin up complete! Disk is running");
DriveLightCallback?.Invoke(true);
break;
case RamAdapterState.IDLE:
SetCycles();
break;
}
}
}
/// <summary>
/// eject the loaded disk
/// </summary>
public void Eject()
{
disk = null;
state = RamAdapterState.IDLE;
SetCycles();
Console.WriteLine("FDS: Disk ejected");
if (DriveLightCallback != null)
{
DriveLightCallback(false);
}
}
/// <summary>
/// control reg
/// </summary>
public void Write4025(byte value)
{
if ((value & 1) != 0) // start motor
{
if (state == RamAdapterState.IDLE && disk != null) // no spinup when no disk
{
// this isn't right, despite the fact that without it some games seem to cycle the disk needlessly??
//if ((cached4025 & 1) != 0)
// Console.WriteLine("FDS: Ignoring spurious spinup");
//else
//{
state = RamAdapterState.SPINUP;
SetCycles();
//}
DriveLightCallback?.Invoke(true);
}
}
if ((value & 2) != 0)
{
transferreset = true;
}
else
{
transferreset = false;
}
if ((cached4025 & 0x40) == 0 && (value & 0x40) != 0)
{
lookingforendofgap = true;
if ((value & 4) == 0)
{
// write mode: reload and go
writeregpos = 0;
writereg = writereglatch;
bytetransferflag = true;
// irq?
// Console.WriteLine("FDS: Startwrite @{0} Reload {1:x2}", diskpos, writereglatch);
crc = 0;
writecomputecrc = true;
}
}
irq = false; // ??
cached4025 = value;
//if ((cached4025 & 4) == 0)
// if ((cached4025 & 0x10) != 0)
// Console.WriteLine("FDS: Starting CRC");
}
/// <summary>
/// insert a new disk. might have to eject first???
/// </summary>
/// <param name="side">least significant bits appear first on physical disk</param>
/// <param name="bitlength">length of disk in bits</param>
/// <param name="writeprotect">disk is write protected</param>
public void Insert(byte[] side, int bitlength, bool writeprotect)
{
if (side.Length * 8 < bitlength)
{
throw new ArgumentException("Disk too small for parameter!");
}
disk = side;
disksize = bitlength;
diskpos = 0;
this.writeprotect = writeprotect;
state = RamAdapterState.INSERTING;
SetCycles();
//Console.WriteLine("FDS: Disk Inserted");
originaldisk = (byte[])disk.Clone();
DriveLightCallback?.Invoke(false);
}
/// <summary>
/// clock at ~5.37mhz
/// </summary>
public void Clock()
{
cycleswaiting--;
if (cycleswaiting == 0)
{
switch (state)
{
case RamAdapterState.RUNNING:
if (transferreset) // run head to end of disk
MoveDummy();
else if ((cached4025 & 4) != 0) // read mode
Read();
else
Write();
if (diskpos >= disksize)
{
// Console.WriteLine("FDS: End of Disk");
state = RamAdapterState.RESET;
transferreset = false;
//numcrc = 0;
if (DriveLightCallback != null)
DriveLightCallback(false);
}
SetCycles();
break;
case RamAdapterState.RESET:
case RamAdapterState.INSERTING:
state = RamAdapterState.IDLE;
diskpos = 0;
SetCycles();
transferreset = false;
//numcrc = 0;
// Console.WriteLine("FDS: Return or Insert Complete");
if (DriveLightCallback != null)
DriveLightCallback(false);
break;
case RamAdapterState.SPINUP:
state = RamAdapterState.RUNNING;
SetCycles();
//transferreset = false; // this definitely does not happen.
// Console.WriteLine("FDS: Spin up complete! Disk is running");
if (DriveLightCallback != null)
DriveLightCallback(true);
break;
case RamAdapterState.IDLE:
SetCycles();
break;
}
}
}
/// <summary>
/// control reg
/// </summary>
/// <param name="value"></param>
public void Write4025(byte value)
{
if ((value & 1) != 0) // start motor
{
if (state == RamAdapterState.IDLE && disk != null) // no spinup when no disk
{
// this isn't right, despite the fact that without it some games seem to cycle the disk needlessly??
//if ((cached4025 & 1) != 0)
// Console.WriteLine("FDS: Ignoring spurious spinup");
//else
//{
state = RamAdapterState.SPINUP;
SetCycles();
//}
if (DriveLightCallback != null)
DriveLightCallback(true);
}
}
if ((value & 2) != 0)
transferreset = true;
if ((cached4025 & 0x40) == 0 && (value & 0x40) != 0)
{
lookingforendofgap = true;
if ((value & 4) == 0)
{
// write mode: reload and go
writeregpos = 0;
writereg = writereglatch;
bytetransferflag = true;
// irq?
// Console.WriteLine("FDS: Startwrite @{0} Reload {1:x2}", diskpos, writereglatch);
crc = 0;
writecomputecrc = true;
}
}
irq = false; // ??
cached4025 = value;
//if ((cached4025 & 4) == 0)
// if ((cached4025 & 0x10) != 0)
// Console.WriteLine("FDS: Starting CRC");
}
/// <summary>
/// insert a new disk. might have to eject first???
/// </summary>
/// <param name="side">least significant bits appear first on physical disk</param>
/// <param name="bitlength">length of disk in bits</param>
/// <param name="writeprotect">disk is write protected</param>
public void Insert(byte[] side, int bitlength, bool writeprotect)
{
if (side.Length * 8 < bitlength)
throw new ArgumentException("Disk too small for parameter!");
disk = side;
disksize = bitlength;
diskpos = 0;
this.writeprotect = writeprotect;
state = RamAdapterState.INSERTING;
SetCycles();
Console.WriteLine("FDS: Disk Inserted");
originaldisk = (byte[])disk.Clone();
if (DriveLightCallback != null)
DriveLightCallback(false);
}
/// <summary>
/// eject the loaded disk
/// </summary>
public void Eject()
{
disk = null;
state = RamAdapterState.IDLE;
SetCycles();
Console.WriteLine("FDS: Disk ejected");
if (DriveLightCallback != null)
DriveLightCallback(false);
}
