public static void BRZ(StatusRegister statusRegister, ProgramCounter programCounter, Registers registers)
{
if (statusRegister.zero)
{
programCounter.programCounter = registers.R[7];
}
}
public static void BRO(StatusRegister statusRegister, ProgramCounter programCounter, Registers registers)
{
if (statusRegister.overflow)
{
programCounter.programCounter = registers.R[7];
}
}
public static void BRN(StatusRegister statusRegister, ProgramCounter programCounter, Registers registers)
{
if (statusRegister.negative)
{
programCounter.programCounter = registers.R[7];
}
}
public static void BRC(StatusRegister statusRegister, ProgramCounter programCounter, Registers registers)
{
if (statusRegister.carry)
{
programCounter.programCounter = registers.R[7];
}
}
public static void ADDC(Accumulator accumulator, Registers registers, byte registerAddress, StatusRegister statusRegister)
{
ushort operator1 = accumulator.accumulator;
ushort operator2 = registers.R[registerAddress];
byte operator1MSB = (byte)((int)operator1 >> 7);
byte operator2MSB = (byte)((int)operator2 >> 7);
accumulator.accumulator = (byte)((int)operator1 + operator2 + Convert.ToUInt16(statusRegister.carry));
byte resMSB = (byte)((int)accumulator.accumulator >> 7);
statusRegister.overflow = (operator1MSB == operator2MSB) && (operator2MSB != resMSB);
statusRegister.carry = ((operator1 + operator2 + Convert.ToUInt16(statusRegister.carry)) > 255);
setNegativeAndZeroFlags(accumulator, statusRegister);
}
public static void LDArf(Accumulator accumulator, Registers registers, byte registerAddress, StatusRegister statusRegister)
{
accumulator.accumulator = registers.R[registerAddress];
resetCarryAndOverflow(statusRegister);
setNegativeAndZeroFlags(accumulator, statusRegister);
}
public static void SUB(Accumulator accumulator, Registers registers, byte registerAddress, StatusRegister statusRegister)
{
int operator1 = accumulator.accumulator;
int operator2 = registers.R[registerAddress];
operator2 = ~operator2++;
byte accMSb = (byte)((int)accumulator.accumulator >> 7);
byte regMSb = (byte)((int)registers.R[registerAddress] >> 7);
accumulator.accumulator += (byte)operator2;
if (statusRegister.carry)
{
accumulator.accumulator++;
}
byte resMSb = (byte)((int)accumulator.accumulator >> 7);
statusRegister.overflow = (accMSb == regMSb) && (resMSb != accMSb);
statusRegister.carry = ((operator1 + operator2) > 255);
setNegativeAndZeroFlags(accumulator, statusRegister);
}
public static void STArf(Registers registers, byte registerAddress, Accumulator accumulator)
{
registers.R[registerAddress] = accumulator.accumulator;
}
