/// <summary>
/// Implements the IN and OUT instructions.
/// </summary>
/// <remarks>
/// For further details refer to the picoComputer documentation.
/// </remarks>
/// <param name="isIn">If true executes IN, otherwise OUT.</param>
protected void InOut(bool isIn)
{
ushort address = GetAddress(Instruction[1]);
ushort count = 1;
if ((Instruction[2] & 0x8) == 0)
{
count = (ushort)((Instruction[2] << 4) | Instruction[3]);
}
else
{
if (Instruction[2] != 0x8)
{
throw new InvalidInstructionRuntimeException(new ushort[] { IR }, (ushort)(Data.PC - 1));
}
count = Data[GetAddress(Instruction[3])];
}
if (isIn)
{
try
{
IODevice.Read(address, count, Data);
}
catch (Exception)
{
throw new InvalidInputRuntimeException(new ushort[] { IR }, (ushort)(Data.PC - 1));
}
}
else // Out
{
IODevice.Write(address, count, Data);
}
}
/// <summary>
/// Implements the STOP instruction.
/// </summary>
/// <remarks>
/// For further details refer to the picoComputer documentation.
/// Throws a NormalTerminationRuntimeException to terminate the program.
/// </remarks>
protected void Stop()
{
for (int i = 1; i <= 3; i++)
{
if (Instruction[i] != 0)
{
IODevice.Write(GetAddress(Instruction[i]), 1, Data);
}
}
throw new NormalTerminationRuntimeException(new ushort[] { IR }, (ushort)(Data.PC - 1));
}