protected override CpuState GetInstructionPart(MachineCycleNames machineCycle)
{
if (!ExecutionEngine.Opcode.Definition.HasParameters)
{
throw Errors.NoParameters();
}
switch (machineCycle)
{
case MachineCycleNames.M2:
InstructionM2 = new ReadT3InstructionPart(Die, machineCycle);
return(InstructionM2);
case MachineCycleNames.M3:
if (ExecutionEngine.Opcode.Definition.ParameterCount <= 1)
{
throw Errors.InvalidMachineCycle(machineCycle);
}
InstructionM3 = new ReadT3InstructionPart(Die, machineCycle);
return(InstructionM3);
default:
throw Errors.InvalidMachineCycle(machineCycle);
}
}
protected override CpuState GetInstructionPart(MachineCycleNames machineCycle)
{
switch (machineCycle)
{
case MachineCycleNames.M2:
// read d
_instructionM2 = new ReadT3InstructionPart(Cpu, machineCycle);
return(_instructionM2);
case MachineCycleNames.M3:
// we postpone inc/dec operation until M4
return(new AutoCompleteInstructionPart(Cpu, machineCycle));
case MachineCycleNames.M4:
_instructionM4 = new ReadT3InstructionPart(Cpu, machineCycle, GetAddress());
return(_instructionM4);
case MachineCycleNames.M5:
_instructionM5 = new WriteT3InstructionPart(Cpu, machineCycle, GetAddress());
_instructionM5.Data = IncDecValue(_instructionM4.Data);
return(_instructionM5);
default:
throw Errors.InvalidMachineCycle(machineCycle);
}
}
protected override CpuState GetInstructionPart(MachineCycleNames machineCycle)
{
switch (machineCycle)
{
case MachineCycleNames.M2:
_instructionM2 = new ReadT3InstructionPart(Die, machineCycle, Registers.SP);
return(_instructionM2);
case MachineCycleNames.M3:
_instructionM3 = new ReadT3InstructionPart(Die, machineCycle, Registers.SP);
return(_instructionM3);
default:
throw Errors.InvalidMachineCycle(machineCycle);
}
}
private CpuState CreateReadDataPart(MachineCycleNames machineCycle)
{
_readPart = new ReadT3InstructionPart(Cpu, machineCycle, Registers.HL);
return(_readPart);
}
private CpuState CreateReadIndirectValueInstructionPart(MachineCycleNames machineCycle)
{
_instructionPart = new ReadT3InstructionPart(Cpu, machineCycle, GetAddress());
return(_instructionPart);
}