/// <summary>
/// Writes a byte of data to a specified port address
/// </summary>
/// <param name="port"></param>
/// <param name="value"></param>
public override void WritePort(ushort port, byte value)
{
// Check whether the low bit is reset
// Technically the ULA should respond to every even I/O address
if ((port & 0x0001) != 0)
{
return;
}
// store the last OUT byte
LastULAOutByte = value;
/*
* Bit 7 6 5 4 3 2 1 0
+-------------------------------+
| | | | E | M | Border |
+-------------------------------+
*/
// Border - LSB 3 bits hold the border colour
if (ULADevice.BorderColor != (value & BORDER_BIT))
{
//ULADevice.RenderScreen((int)CurrentFrameCycle);
ULADevice.BorderColor = value & BORDER_BIT;
}
// Buzzer
BuzzerDevice.ProcessPulseValue((value & EAR_BIT) != 0);
// Tape
TapeDevice.WritePort(port, value);
// Tape mic processing (not implemented yet)
//TapeDevice.ProcessMicBit((value & MIC_BIT) != 0);
}
public void SyncState(Serializer ser)
{
ser.BeginSection("ZXMachine");
ser.Sync("FrameCompleted", ref FrameCompleted);
ser.Sync("OverFlow", ref OverFlow);
ser.Sync("FrameCount", ref FrameCount);
ser.Sync("_frameCycles", ref _frameCycles);
ser.Sync("inputRead", ref inputRead);
ser.Sync("LastFrameStartCPUTick", ref LastFrameStartCPUTick);
ser.Sync("LastULAOutByte", ref LastULAOutByte);
ser.Sync("ROM0", ref ROM0, false);
ser.Sync("ROM1", ref ROM1, false);
ser.Sync("ROM2", ref ROM2, false);
ser.Sync("ROM3", ref ROM3, false);
ser.Sync("RAM0", ref RAM0, false);
ser.Sync("RAM1", ref RAM1, false);
ser.Sync("RAM2", ref RAM2, false);
ser.Sync("RAM3", ref RAM3, false);
ser.Sync("RAM4", ref RAM4, false);
ser.Sync("RAM5", ref RAM5, false);
ser.Sync("RAM6", ref RAM6, false);
ser.Sync("RAM7", ref RAM7, false);
ser.Sync("ROMPaged", ref ROMPaged);
ser.Sync("SHADOWPaged", ref SHADOWPaged);
ser.Sync("RAMPaged", ref RAMPaged);
ser.Sync("PagingDisabled", ref PagingDisabled);
ser.Sync("SpecialPagingMode", ref SpecialPagingMode);
ser.Sync("PagingConfiguration", ref PagingConfiguration);
ser.Sync("ROMhigh", ref ROMhigh);
ser.Sync("ROMlow", ref ROMlow);
KeyboardDevice.SyncState(ser);
BuzzerDevice.SyncState(ser);
TapeBuzzer.SyncState(ser);
ULADevice.SyncState(ser);
if (AYDevice != null)
{
AYDevice.SyncState(ser);
((AYChip)AYDevice as AYChip).PanningConfiguration = Spectrum.Settings.AYPanConfig;
}
if (UPDDiskDevice != null)
{
UPDDiskDevice.SyncState(ser);
}
ser.Sync("tapeMediaIndex", ref tapeMediaIndex);
TapeMediaIndex = tapeMediaIndex;
ser.Sync("diskMediaIndex", ref diskMediaIndex);
DiskMediaIndex = diskMediaIndex;
TapeDevice.SyncState(ser);
ser.EndSection();
}
/// <summary>
/// Writes a byte of data to a specified port address
/// </summary>
/// <param name="port"></param>
/// <param name="value"></param>
public override void WritePort(ushort port, byte value)
{
// process IO contention
ContendPortAddress(port);
// Check whether the low bit is reset
// Technically the ULA should respond to every even I/O address
if ((port & 0x0001) != 0)
{
return;
}
// store the last OUT byte
LastULAOutByte = value;
/*
* Bit 7 6 5 4 3 2 1 0
+-------------------------------+
| | | | E | M | Border |
+-------------------------------+
*/
// Border - LSB 3 bits hold the border colour
if (ULADevice.borderColour != (value & BORDER_BIT))
{
// border value has changed - update the screen buffer
ULADevice.UpdateScreenBuffer(CurrentFrameCycle);
}
ULADevice.borderColour = value & BORDER_BIT;
// Buzzer
BuzzerDevice.ProcessPulseValue((value & EAR_BIT) != 0);
// Tape
TapeDevice.WritePort(port, value);
// Tape mic processing (not implemented yet)
//TapeDevice.ProcessMicBit((value & MIC_BIT) != 0);
}
/// <summary>
/// Writes a byte of data to a specified port address
/// </summary>
/// <param name="port"></param>
/// <param name="value"></param>
public override void WritePort(ushort port, byte value)
{
// process IO contention
ContendPortAddress(port);
// get a BitArray of the port
BitArray portBits = new BitArray(BitConverter.GetBytes(port));
// get a BitArray of the value byte
BitArray bits = new BitArray(new byte[] { value });
// Check whether the low bit is reset
bool lowBitReset = !portBits[0]; // (port & 0x01) == 0;
AYDevice.WritePort(port, value);
UPDDiskDevice.WritePort(port, value);
// port 0x7ffd - hardware should only respond when bits 1 & 15 are reset and bit 14 is set
if (port == 0x7ffd)
{
if (!PagingDisabled)
{
// bits 0, 1, 2 select the RAM page
var rp = value & 0x07;
if (rp < 8)
{
RAMPaged = rp;
}
// bit 3 controls shadow screen
SHADOWPaged = bits[3];
// Bit 5 set signifies that paging is disabled until next reboot
PagingDisabled = bits[5];
// portbit 4 is the LOW BIT of the ROM selection
ROMlow = bits[4];
}
}
// port 0x1ffd - hardware should only respond when bits 1, 13, 14 & 15 are reset and bit 12 is set
if (port == 0x1ffd)
{
if (!PagingDisabled)
{
if (!bits[0])
{
// special paging is not enabled - get the ROMpage high byte
ROMhigh = bits[2];
// set the special paging mode flag
SpecialPagingMode = false;
}
else
{
// special paging is enabled
// this is decided based on combinations of bits 1 & 2
// Config 0 = Bit1-0 Bit2-0
// Config 1 = Bit1-1 Bit2-0
// Config 2 = Bit1-0 Bit2-1
// Config 3 = Bit1-1 Bit2-1
BitArray confHalfNibble = new BitArray(2);
confHalfNibble[0] = bits[1];
confHalfNibble[1] = bits[2];
// set special paging configuration
PagingConfiguration = ZXSpectrum.GetIntFromBitArray(confHalfNibble);
// set the special paging mode flag
SpecialPagingMode = true;
}
}
// bit 4 is the printer port strobe
PrinterPortStrobe = bits[4];
}
// Only even addresses address the ULA
if (lowBitReset)
{
// store the last OUT byte
LastULAOutByte = value;
/*
* Bit 7 6 5 4 3 2 1 0
+-------------------------------+
| | | | E | M | Border |
+-------------------------------+
*/
// Border - LSB 3 bits hold the border colour
if (ULADevice.borderColour != (value & BORDER_BIT))
{
ULADevice.UpdateScreenBuffer(CurrentFrameCycle);
}
ULADevice.borderColour = value & BORDER_BIT;
// Buzzer
BuzzerDevice.ProcessPulseValue((value & EAR_BIT) != 0);
// Tape
TapeDevice.WritePort(port, value);
// Tape
//TapeDevice.ProcessMicBit((value & MIC_BIT) != 0);
}
LastULAOutByte = value;
}
/// <summary>
/// Executes a single frame
/// </summary>
public virtual void ExecuteFrame(bool render, bool renderSound)
{
InputRead = false;
_render = render;
_renderSound = renderSound;
FrameCompleted = false;
TapeDevice.StartFrame();
if (_renderSound)
{
BuzzerDevice.StartFrame();
TapeBuzzer.StartFrame();
if (AYDevice != null)
{
AYDevice.StartFrame();
}
}
PollInput();
while (CurrentFrameCycle < ULADevice.FrameLength)
{
// check for interrupt
ULADevice.CheckForInterrupt(CurrentFrameCycle);
// run a single CPU instruction
CPU.ExecuteOne();
// cycle the tape device
TapeDevice.TapeCycle();
}
// we have reached the end of a frame
LastFrameStartCPUTick = CPU.TotalExecutedCycles - OverFlow;
// paint the buffer if needed
if (ULADevice.needsPaint && _render)
{
ULADevice.UpdateScreenBuffer(ULADevice.FrameLength);
}
if (_renderSound)
{
BuzzerDevice.EndFrame();
TapeBuzzer.EndFrame();
}
if (AYDevice != null)
{
AYDevice.EndFrame();
}
FrameCount++;
// setup for next frame
ULADevice.ResetInterrupt();
TapeDevice.EndFrame();
FrameCompleted = true;
// is this a lag frame?
Spectrum.IsLagFrame = !InputRead;
}
/// <summary>
/// Writes a byte of data to a specified port address
/// </summary>
public override void WritePort(ushort port, byte value)
{
// get a BitArray of the port
BitArray portBits = new BitArray(BitConverter.GetBytes(port));
// get a BitArray of the value byte
BitArray bits = new BitArray(new byte[] { value });
// handle AY port writes
AYDevice.WritePort(port, value);
// memory paging
// this is controlled by writes to port 0x7ffd
// but it is only partially decoded so it actually responds to any port with bits 1 and 15 reset
if (portBits[1] == false && portBits[15] == false)
{
Last7ffd = value;
// if paging is disabled then all writes to this port are ignored until the next reboot
if (!PagingDisabled)
{
// Bits 0, 1, 2 select the RAM page
var rp = value & 0x07;
if (RAMPaged != rp && rp < 8)
{
RAMPaged = rp;
}
// bit 3 controls shadow screen
if (SHADOWPaged != bits[3])
{
SHADOWPaged = bits[3];
}
// ROM page
if (bits[4])
{
// 48k basic rom
ROMPaged = 1;
}
else
{
// 128k editor and menu system
ROMPaged = 0;
}
// Bit 5 set signifies that paging is disabled until next reboot
PagingDisabled = bits[5];
}
else
{
// no changes to paging
}
}
if (port == 0x1ffd)
{
}
// Check whether the low bit is reset
// Technically the ULA should respond to every even I/O address
bool lowBitReset = !portBits[0]; // (port & 0x01) == 0;
// Only even addresses address the ULA
if (lowBitReset)
{
LastFe = value;
// store the last OUT byte
LastULAOutByte = value;
/*
* Bit 7 6 5 4 3 2 1 0
+-------------------------------+
| | | | E | M | Border |
+-------------------------------+
*/
// Border - LSB 3 bits hold the border colour
if (ULADevice.BorderColor != (value & BORDER_BIT))
{
//ULADevice.RenderScreen((int)CurrentFrameCycle);
ULADevice.BorderColor = value & BORDER_BIT;
}
// Buzzer
BuzzerDevice.ProcessPulseValue((value & EAR_BIT) != 0, _renderSound);
TapeDevice.WritePort(port, value);
// Tape
//TapeDevice.ProcessMicBit((value & MIC_BIT) != 0);
}
}
public void SyncState(Serializer ser)
{
ser.BeginSection("ZXMachine");
ser.Sync(nameof(FrameCompleted), ref FrameCompleted);
ser.Sync(nameof(OverFlow), ref OverFlow);
ser.Sync(nameof(FrameCount), ref FrameCount);
ser.Sync(nameof(_frameCycles), ref _frameCycles);
ser.Sync(nameof(inputRead), ref inputRead);
ser.Sync(nameof(LastFrameStartCPUTick), ref LastFrameStartCPUTick);
ser.Sync(nameof(LastULAOutByte), ref LastULAOutByte);
ser.Sync(nameof(ROM0), ref ROM0, false);
ser.Sync(nameof(ROM1), ref ROM1, false);
ser.Sync(nameof(ROM2), ref ROM2, false);
ser.Sync(nameof(ROM3), ref ROM3, false);
ser.Sync(nameof(RAM0), ref RAM0, false);
ser.Sync(nameof(RAM1), ref RAM1, false);
ser.Sync(nameof(RAM2), ref RAM2, false);
ser.Sync(nameof(RAM3), ref RAM3, false);
ser.Sync(nameof(RAM4), ref RAM4, false);
ser.Sync(nameof(RAM5), ref RAM5, false);
ser.Sync(nameof(RAM6), ref RAM6, false);
ser.Sync(nameof(RAM7), ref RAM7, false);
ser.Sync(nameof(ROMPaged), ref ROMPaged);
ser.Sync(nameof(SHADOWPaged), ref SHADOWPaged);
ser.Sync(nameof(RAMPaged), ref RAMPaged);
ser.Sync(nameof(PagingDisabled), ref PagingDisabled);
ser.Sync(nameof(SpecialPagingMode), ref SpecialPagingMode);
ser.Sync(nameof(PagingConfiguration), ref PagingConfiguration);
ser.Sync(nameof(ROMhigh), ref ROMhigh);
ser.Sync(nameof(ROMlow), ref ROMlow);
ser.Sync(nameof(LastContendedReadByte), ref LastContendedReadByte);
KeyboardDevice.SyncState(ser);
BuzzerDevice.SyncState(ser);
TapeBuzzer.SyncState(ser);
ULADevice.SyncState(ser);
CPUMon.SyncState(ser);
if (AYDevice != null)
{
AYDevice.SyncState(ser);
((AY38912)AYDevice).PanningConfiguration = Spectrum.Settings.AYPanConfig;
}
ser.Sync(nameof(tapeMediaIndex), ref tapeMediaIndex);
if (ser.IsReader)
{
IsLoadState = true;
TapeMediaIndex = tapeMediaIndex;
IsLoadState = false;
}
TapeDevice.SyncState(ser);
ser.Sync(nameof(diskMediaIndex), ref diskMediaIndex);
if (ser.IsReader)
{
IsLoadState = true;
DiskMediaIndex = diskMediaIndex;
IsLoadState = false;
}
UPDDiskDevice?.SyncState(ser);
ser.EndSection();
}
/// <summary>
/// Executes a single frame
/// </summary>
public virtual void ExecuteFrame(bool render, bool renderSound)
{
ULADevice.FrameEnd = false;
ULADevice.ULACycleCounter = CurrentFrameCycle;
InputRead = false;
_render = render;
_renderSound = renderSound;
FrameCompleted = false;
//if (UPDDiskDevice == null || !UPDDiskDevice.FDD_IsDiskLoaded)
//TapeDevice.StartFrame();
if (_renderSound)
{
AYDevice?.StartFrame();
}
PollInput();
for (; ;)
{
// run the CPU Monitor cycle
CPUMon.ExecuteCycle();
// clock the beepers
TapeBuzzer.SetClock((int)CurrentFrameCycle);
BuzzerDevice.SetClock((int)CurrentFrameCycle);
// cycle the tape device
if (UPDDiskDevice == null || !UPDDiskDevice.FDD_IsDiskLoaded)
{
TapeDevice.TapeCycle();
}
// has frame end been reached?
if (ULADevice.FrameEnd)
{
break;
}
}
OverFlow = (int)CurrentFrameCycle - ULADevice.FrameLength;
// we have reached the end of a frame
LastFrameStartCPUTick = CPU.TotalExecutedCycles - OverFlow;
ULADevice.LastTState = 0;
AYDevice?.EndFrame();
FrameCount++;
if (UPDDiskDevice == null || !UPDDiskDevice.FDD_IsDiskLoaded)
{
TapeDevice.EndFrame();
}
FrameCompleted = true;
// is this a lag frame?
Spectrum.IsLagFrame = !InputRead;
// FDC debug
if (UPDDiskDevice != null && UPDDiskDevice.writeDebug)
{
// only write UPD log every second
if (FrameCount % 10 == 0)
{
System.IO.File.AppendAllLines(UPDDiskDevice.outputfile, UPDDiskDevice.dLog);
UPDDiskDevice.dLog = new System.Collections.Generic.List <string>();
//System.IO.File.WriteAllText(UPDDiskDevice.outputfile, UPDDiskDevice.outputString);
}
}
}
/// <summary>
/// Executes a single frame
/// </summary>
public virtual void ExecuteFrame(bool render, bool renderSound)
{
InputRead = false;
_render = render;
_renderSound = renderSound;
FrameCompleted = false;
if (UPDDiskDevice == null || !UPDDiskDevice.FDD_IsDiskLoaded)
{
TapeDevice.StartFrame();
}
if (_renderSound)
{
BuzzerDevice.StartFrame();
TapeBuzzer.StartFrame();
if (AYDevice != null)
{
AYDevice.StartFrame();
}
}
PollInput();
while (CurrentFrameCycle < ULADevice.FrameLength)
{
// check for interrupt
ULADevice.CheckForInterrupt(CurrentFrameCycle);
// run a single CPU instruction
CPU.ExecuteOne();
// cycle the tape device
if (UPDDiskDevice == null || !UPDDiskDevice.FDD_IsDiskLoaded)
{
TapeDevice.TapeCycle();
}
}
// we have reached the end of a frame
LastFrameStartCPUTick = CPU.TotalExecutedCycles - OverFlow;
// paint the buffer if needed
if (ULADevice.needsPaint && _render)
{
ULADevice.UpdateScreenBuffer(ULADevice.FrameLength);
}
if (_renderSound)
{
BuzzerDevice.EndFrame();
TapeBuzzer.EndFrame();
}
if (AYDevice != null)
{
AYDevice.EndFrame();
}
FrameCount++;
// setup for next frame
ULADevice.ResetInterrupt();
if (UPDDiskDevice == null || !UPDDiskDevice.FDD_IsDiskLoaded)
{
TapeDevice.EndFrame();
}
FrameCompleted = true;
// is this a lag frame?
Spectrum.IsLagFrame = !InputRead;
// FDC debug
if (UPDDiskDevice != null && UPDDiskDevice.writeDebug)
{
// only write UPD log every second
if (FrameCount % 10 == 0)
{
System.IO.File.WriteAllText(UPDDiskDevice.outputfile, UPDDiskDevice.outputString);
}
}
}
