public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
ushort value1;
ushort value2;
byte size;
if (instruction.Flag.Has(OpCodeManager.OpCodeFlag.Size8))
{
value1 = cpu.GetRegisterU8(Register.AL);
value2 = cpu.ReadU8(InstructionHelper.SegmentToAddress(cpu.GetRegister(Register.ES), cpu.GetRegister(Register.DI)));
size = 1;
}
else
{
value1 = cpu.GetRegister(Register.AX);
value2 = cpu.ReadU16(InstructionHelper.SegmentToAddress(cpu.GetRegister(Register.ES), cpu.GetRegister(Register.DI)));
size = 2;
}
var result = value1 - value2;
InstructionHelper.CalculateSubFlags(cpu, instruction.Flag, value1, value2, result);
if (!cpu.GetFlags().Has(FlagsRegister.Direction))
{
cpu.IncRegister(Register.DI, size);
}
else
{
cpu.DecRegister(Register.DI, size);
}
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
cpu.DecRegister(Register.CX);
var counter = cpu.GetRegister(Register.CX);
if (counter != 0)
{
new JumpRelative().Dispatch(cpu, instruction);
}
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
var segment = Register.DS;
if (instruction.SegmentPrefix != Register.Invalid)
{
segment = instruction.SegmentPrefix;
}
var sourceAddress = InstructionHelper.SegmentToAddress(cpu.GetRegister(segment), cpu.GetRegister(Register.SI));
var destAddress = InstructionHelper.SegmentToAddress(cpu.GetRegister(Register.ES), cpu.GetRegister(Register.DI));
byte size;
if (instruction.Flag.Has(OpCodeManager.OpCodeFlag.Size8))
{
var value = cpu.ReadU8(sourceAddress);
cpu.WriteU8(destAddress, value);
size = 1;
}
else
{
var value = cpu.ReadU16(sourceAddress);
cpu.WriteU16(destAddress, value);
size = 2;
}
if (!cpu.GetFlags().Has(FlagsRegister.Direction))
{
cpu.IncRegister(Register.DI, size);
cpu.IncRegister(Register.SI, size);
}
else
{
cpu.DecRegister(Register.DI, size);
cpu.DecRegister(Register.SI, size);
}
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
byte size;
if (instruction.Flag.Has(OpCodeManager.OpCodeFlag.Size8))
{
cpu.WriteU8(InstructionHelper.SegmentToAddress(cpu.GetRegister(Register.ES), cpu.GetRegister(Register.DI)), (byte)(cpu.GetRegister(Register.AX) & 0xFF));
size = 1;
}
else
{
cpu.WriteU16(InstructionHelper.SegmentToAddress(cpu.GetRegister(Register.ES), cpu.GetRegister(Register.DI)), cpu.GetRegister(Register.AX));
size = 2;
}
if (!cpu.GetFlags().Has(FlagsRegister.Direction))
{
cpu.IncRegister(Register.DI, size);
}
else
{
cpu.DecRegister(Register.DI, size);
}
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
cpu.DecRegister(Register.IP);
}