/// <summary>
/// Sends a byte to the port with the specified address
/// </summary>
/// <param name="addr">Port address</param>
/// <param name="data">Data to write to the port</param>
/// <returns>Byte read from the memory</returns>
public void OnWritePort(ushort addr, byte data)
{
if ((addr & 0x0001) == 0)
{
_borderDevice.BorderColor = data & 0x07;
_beeperDevice.ProcessEarBitValue(false, (data & 0x10) != 0);
_tapeDevice.ProcessMicBit((data & 0x08) != 0);
}
}
/// <summary>
/// Handles Spectrum 48 ports
/// </summary>
/// <param name="addr">Port address</param>
/// <param name="data">Data to write to the port</param>
public void HandleSpectrum48PortWrites(ushort addr, byte data)
{
// --- Handle I/O contention
ContentionWait(addr);
// --- Carry out the I/O write operation
if ((addr & 0x0001) != 0)
{
return;
}
_screenDevice.BorderColor = data & 0x07;
_beeperDevice.ProcessEarBitValue(false, (data & 0x10) != 0);
_tapeDevice.ProcessMicBit((data & 0x08) != 0);
}
/// <summary>
/// Sends a byte to the port with the specified address
/// </summary>
/// <param name="addr">Port address</param>
/// <param name="data">Data to write to the port</param>
/// <returns>Byte read from the memory</returns>
public override void OnWritePort(ushort addr, byte data)
{
// --- Handle I/O contention
base.OnReadPort(addr);
// --- Carry out the I/O write operation
if ((addr & 0x0001) != 0)
{
return;
}
_screenDevice.BorderColor = data & 0x07;
_beeperDevice.ProcessEarBitValue(false, (data & 0x10) != 0);
_tapeDevice.ProcessMicBit((data & 0x08) != 0);
}
/// <summary>
/// Writes the specified value to the port
/// </summary>
/// <param name="addr">Full port address</param>
/// <param name="writeValue">Value to write to the port</param>
public override void HandleWrite(ushort addr, byte writeValue)
{
_screenDevice.BorderColor = writeValue & 0x07;
_beeperDevice.ProcessEarBitValue(false, (writeValue & 0x10) != 0);
_tapeDevice.ProcessMicBit((writeValue & 0x08) != 0);
// --- Set the lates value of bit 3
_bit3LastValue = (writeValue & 0x08) != 0;
// --- Manage bit 4 value
var curBit4 = (writeValue & 0x10) != 0;
if (!_bit4LastValue && curBit4)
{
// --- Bit 4 goers from0 to 1
_bit4ChangedFrom0 = _cpu.Tacts;
_bit4LastValue = true;
}
else if (_bit4LastValue && !curBit4)
{
_bit4ChangedFrom1 = _cpu.Tacts;
_bit4LastValue = false;
}
}
/// <summary>
/// Writes the specified value to the port
/// </summary>
/// <param name="addr">Full port address</param>
/// <param name="writeValue">Value to write to the port</param>
public override void HandleWrite(ushort addr, byte writeValue)
{
_screenDevice.BorderColor = writeValue & 0x07;
_beeperDevice.ProcessEarBitValue(false, (writeValue & 0x10) != 0);
_tapeDevice.ProcessMicBit((writeValue & 0x08) != 0);
}
