private byte ReadPort(ushort port)
{
port &= 0xFF;
if (port >= 0xA0 && port < 0xC0)
{
if ((port & 1) == 0)
{
return(_vdp.ReadData());
}
return(_vdp.ReadVdpStatus());
}
if (port >= 0xE0)
{
if ((port & 1) == 0)
{
return(ReadController1());
}
return(ReadController2());
}
if (use_SGM)
{
if (port == 0x50)
{
return(SGM_sound.port_sel);
}
if (port == 0x52)
{
return(SGM_sound.ReadReg());
}
if (port == 0x53)
{
return(port_0x53);
}
if (port == 0x7F)
{
return(port_0x7F);
}
}
return(0xFF);
}
private void SyncState(Serializer ser)
{
byte[] core = null;
if (ser.IsWriter)
{
var ms = new MemoryStream();
ms.Close();
core = ms.ToArray();
}
_cpu.SyncState(ser);
ser.BeginSection("Coleco");
_vdp.SyncState(ser);
ControllerDeck.SyncState(ser);
PSG.SyncState(ser);
SGM_sound.SyncState(ser);
ser.Sync("UseSGM", ref use_SGM);
ser.Sync("is_MC", ref is_MC);
ser.Sync("MC_bank", ref MC_bank);
ser.Sync("EnableSGMhigh", ref enable_SGM_high);
ser.Sync("EnableSGMlow", ref enable_SGM_low);
ser.Sync("Port_0x53", ref port_0x53);
ser.Sync("Port_0x7F", ref port_0x7F);
ser.Sync("RAM", ref _ram, false);
ser.Sync("SGM_high_RAM", ref SGM_high_RAM, false);
ser.Sync("SGM_low_RAM", ref SGM_low_RAM, false);
ser.Sync("Frame", ref _frame);
ser.Sync("LagCount", ref _lagCount);
ser.Sync("IsLag", ref _isLag);
ser.EndSection();
if (ser.IsReader)
{
SyncAllByteArrayDomains();
}
}
public bool FrameAdvance(IController controller, bool render, bool renderSound)
{
_controller = controller;
// NOTE: Need to research differences between reset and power cycle
if (_controller.IsPressed("Power"))
{
HardReset();
}
if (_controller.IsPressed("Reset"))
{
SoftReset();
}
_frame++;
_isLag = true;
if (_tracer.Enabled)
{
_cpu.TraceCallback = s => _tracer.Put(s);
}
else
{
_cpu.TraceCallback = null;
}
byte tempRet1 = ControllerDeck.ReadPort1(controller, true, false);
byte tempRet2 = ControllerDeck.ReadPort2(controller, true, false);
bool intPending = false;
// the return values represent the controller's current state, but the sampling rate is not high enough
// to catch all changes in wheel orientation
// so we use the wheel variable and interpolate between frames
// first determine how many degrees the wheels changed, and how many regions have been traversed
float change1 = (float)(((ControllerDeck.wheel1 - ControllerDeck.temp_wheel1) % 180) / 1.25);
float change2 = (float)(((ControllerDeck.wheel2 - ControllerDeck.temp_wheel2) % 180) / 1.25);
// special cases
if ((ControllerDeck.temp_wheel1 > 270) && (ControllerDeck.wheel1 < 90))
{
change1 = (float)((ControllerDeck.wheel1 + (360 - ControllerDeck.temp_wheel1)) / 1.25);
}
if ((ControllerDeck.wheel1 > 270) && (ControllerDeck.temp_wheel1 < 90))
{
change1 = -(float)((ControllerDeck.temp_wheel1 + (360 - ControllerDeck.wheel1)) / 1.25);
}
if ((ControllerDeck.temp_wheel2 > 270) && (ControllerDeck.wheel2 < 90))
{
change2 = (float)((ControllerDeck.wheel2 + (360 - ControllerDeck.temp_wheel2)) / 1.25);
}
if ((ControllerDeck.wheel2 > 270) && (ControllerDeck.temp_wheel2 < 90))
{
change2 = -(float)((ControllerDeck.temp_wheel2 + (360 - ControllerDeck.wheel2)) / 1.25);
}
int changes1 = change1 > 0 ? (int)Math.Floor(change1) : (int)Math.Ceiling(change1);
int changes2 = change2 > 0 ? (int)Math.Floor(change2) : (int)Math.Ceiling(change2);
for (int scanLine = 0; scanLine < 262; scanLine++)
{
_vdp.RenderScanline(scanLine);
if (scanLine == 192)
{
_vdp.InterruptPending = true;
if (_vdp.EnableInterrupts)
{
_cpu.NonMaskableInterrupt = true;
}
}
for (int i = 0; i < 228; i++)
{
PSG.generate_sound(1);
if (use_SGM)
{
SGM_sound.generate_sound(1);
}
_cpu.ExecuteOne();
// pick out sound samples from the sound devices twice per scanline
int v = PSG.Sample();
if (use_SGM)
{
v += SGM_sound.Sample();
}
if (v != _latchedSample)
{
_blip.AddDelta((uint)_sampleClock, v - _latchedSample);
_latchedSample = v;
}
_sampleClock++;
}
// starting from scanline 20, changes to the wheel are added once per scanline (up to 144)
if (scanLine > 20)
{
if (changes1 != 0)
{
if (changes1 > 0)
{
ControllerDeck.temp_wheel1 = (float)((ControllerDeck.temp_wheel1 + 1.25) % 360);
changes1--;
}
else
{
ControllerDeck.temp_wheel1 = (float)((ControllerDeck.temp_wheel1 - 1.25) % 360);
changes1++;
}
}
if (changes2 != 0)
{
if (changes2 > 0)
{
ControllerDeck.temp_wheel2 = (float)((ControllerDeck.temp_wheel2 + 1.25) % 360);
changes2--;
}
else
{
ControllerDeck.temp_wheel2 = (float)((ControllerDeck.temp_wheel2 - 1.25) % 360);
changes2++;
}
}
}
tempRet1 = ControllerDeck.ReadPort1(controller, true, true);
tempRet2 = ControllerDeck.ReadPort2(controller, true, true);
intPending = (!tempRet1.Bit(4) && temp_1_prev) | (!tempRet2.Bit(4) && temp_2_prev);
_cpu.FlagI = false;
if (intPending)
{
_cpu.FlagI = true;
intPending = false;
}
temp_1_prev = tempRet1.Bit(4);
temp_2_prev = tempRet2.Bit(4);
}
ControllerDeck.temp_wheel1 = ControllerDeck.wheel1;
ControllerDeck.temp_wheel2 = ControllerDeck.wheel2;
if (_isLag)
{
_lagCount++;
}
return(true);
}
private void WritePort(ushort port, byte value)
{
port &= 0xFF;
if (port >= 0xA0 && port <= 0xBF)
{
if ((port & 1) == 0)
{
_vdp.WriteVdpData(value);
}
else
{
_vdp.WriteVdpControl(value);
}
return;
}
if (port >= 0x80 && port <= 0x9F)
{
_inputPortSelection = InputPortMode.Right;
return;
}
if (port >= 0xC0 && port <= 0xDF)
{
_inputPortSelection = InputPortMode.Left;
return;
}
if (port >= 0xE0)
{
PSG.WriteReg(value);
}
if (use_SGM)
{
if (port == 0x50)
{
SGM_sound.port_sel = (byte)(value & 0xF);
}
if (port == 0x51)
{
SGM_sound.WriteReg(value);
}
if (port == 0x53)
{
if ((value & 1) > 0)
{
enable_SGM_high = true;
}
else
{
// NOTE: the documentation states that you shouldn't turn RAM back off once enabling it
// so we won't do anything here
}
port_0x53 = value;
}
if (port == 0x7F)
{
if (value == 0xF)
{
enable_SGM_low = false;
}
else if (value == 0xD)
{
enable_SGM_low = true;
}
port_0x7F = value;
}
}
}
