public static void DCR(ref string line, LineAssembleResult result)
{
result.FutureLineNumber = result.LineNumber + 1;
var match = Regex.Match(line, @"DCR\s+([\w])");
if (match.Success)
{
Register from = AssemblyUtility.IsRegister(match.Groups[1].Value);
if (from != null)
{
if (match.Groups[1].Value == "M")
{
AssemblyUtility.AddAdjustFlags(I8085.M, 1, false);
I8085.M -= 1;
if (I8085.M < I8085.MemorySize && I8085.M >= 0)
{
result.RegistersChanged.Add(new Register(I8085.M.ToString().PadLeft(4, '0'),
null, I8085.Memory[I8085.M].Data));
}
else
{
result.SetError("INR instruction value out of bound:" + I8085.M);
return;
}
}
else
{
AssemblyUtility.SubAdjustFlags(from.Value, 1, false);
from.Value -= 1;
result.RegistersChanged.Add(I8085.A);
}
}
else
{
result.SetError("DCR instruction work with Register Only.");
return;
}
line = line.Replace(match.Groups[0].Value, string.Empty);
}
else
{
result.SetError("DCR instruction is incorrectly formatted");
return;
}
}
public static void SBB(ref string line, LineAssembleResult result)
{
result.FutureLineNumber = result.LineNumber + 1;
var match = Regex.Match(line, @"SBB\s+([\w])");
if (match.Success)
{
Register from = AssemblyUtility.IsRegister(match.Groups[1].Value);
if (from != null)
{
if (match.Groups[1].Value == "M")
{
AssemblyUtility.SubAdjustFlags(I8085.A.Value, I8085.Memory[I8085.M].Data,
Convert.ToByte(I8085.Flag_C.Value));
I8085.A.Value -= I8085.Memory[I8085.M].Data;
I8085.A.Value -= Convert.ToByte(I8085.Flag_C.Value);
result.RegistersChanged.Add(I8085.A);
}
else
{
AssemblyUtility.SubAdjustFlags(I8085.A.Value, from.Value, Convert.ToByte(I8085.Flag_C.Value));
I8085.A.Value -= from.Value;
I8085.A.Value -= (byte)(I8085.Flag_C.Value ? 1 : 0);
result.RegistersChanged.Add(I8085.A);
}
}
else
{
result.SetError("SBB instruction work with Register Only.");
return;
}
line = line.Replace(match.Groups[0].Value, string.Empty);
}
else
{
result.SetError("SBB instruction is incorrectly formatted");
return;
}
}
public static void SBI(ref string line, LineAssembleResult result)
{
result.FutureLineNumber = result.LineNumber + 1;
var match = Regex.Match(line, @"SBI\s+(\d{1,}H?)");
if (match.Success)
{
bool valueHexType = match.Groups[1].Value.ToLower().IndexOf("h") > 0;
byte value;
if (valueHexType)
{
string val = match.Groups[1].Value.ToLower().Replace("h", string.Empty);
value = Convert.ToByte(val, 16);
}
else
{
value = Convert.ToByte(match.Groups[1].Value, 10);
}
if (value >= 0 && value <= 255)
{
AssemblyUtility.SubAdjustFlags(I8085.A.Value, value, Convert.ToByte(I8085.Flag_C.Value));
I8085.A.Value -= value;
I8085.A.Value -= (byte)(I8085.Flag_C.Value ? 1 : 0);
result.RegistersChanged.Add(I8085.A);
}
else
{
result.SetError("SBI should utilized 8 bit data only ie from 00-FF or 0-255");
return;
}
line = line.Replace(match.Groups[0].Value, string.Empty);
}
else
{
result.SetError("SBI instruction is incorrectly formatted");
return;
}
}