public static void NEG(Accumulator accumulator, StatusRegister statusRegister)
{
int operator1 = accumulator.accumulator;
byte operator1MSB = (byte)((int)operator1 >> 7);
accumulator.accumulator = (byte)~accumulator.accumulator;
accumulator.accumulator++;
byte resMSB = (byte)((int)accumulator.accumulator >> 7);
statusRegister.overflow = (operator1MSB == 0) && (0 != resMSB);
statusRegister.carry = ((operator1 + 1) > 255);
setNegativeAndZeroFlags(accumulator, statusRegister);
}
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 NOT(Accumulator accumulator, StatusRegister statusRegister)
{
accumulator.accumulator = (byte)~accumulator.accumulator;
resetCarryAndOverflow(statusRegister);
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 LDI(Accumulator accumulator, byte constant, StatusRegister statusRegister)
{
accumulator.accumulator = constant;
resetCarryAndOverflow(statusRegister);
setNegativeAndZeroFlags(accumulator, statusRegister);
}
private static void setNegativeAndZeroFlags(Accumulator accumulator, StatusRegister statusRegister)
{
statusRegister.negative = (accumulator.accumulator & 128) == 128;
statusRegister.zero = accumulator.accumulator == 0;
}
public static void LDAaddr(Accumulator accumulator, Memory memory, byte address, StatusRegister statusRegister)
{
accumulator.accumulator = memory.memory[address];
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 VADD(Accumulator accumulator, VectorAdderBuffer vectorAdderBuffer, VectorStack vectorStack0, VectorStack vectorStack1, StatusRegister statusRegister)
{
ushort operator1 = vectorStack0.pop();
ushort operator2 = vectorStack1.pop();
byte operator1MSB = (byte)((int)operator1 >> 7);
byte operator2MSB = (byte)((int)operator2 >> 7);
accumulator.accumulator = (byte)((int)operator1 + operator2);
byte resMSB = (byte)((int)accumulator.accumulator >> 7);
statusRegister.overflow = (operator1MSB == operator2MSB) && (operator2MSB != resMSB);
statusRegister.carry = ((operator1 + operator2) > 255);
setNegativeAndZeroFlags(accumulator, statusRegister);
vectorAdderBuffer.vectorAdderBuffer = (byte)((int)vectorStack0.pop() + vectorStack1.pop());
}
public static void STArf(Registers registers, byte registerAddress, Accumulator accumulator)
{
registers.R[registerAddress] = accumulator.accumulator;
}
public static void STAaddr(Memory memory, byte address, Accumulator accumulator)
{
memory.memory[address] = accumulator.accumulator;
}
public static void RRC(Accumulator accumulator, StatusRegister statusRegister)
{
byte accLSB = (byte)((int)accumulator.accumulator & 1);
accumulator.accumulator >>= 1;
accumulator.accumulator |= (byte)(statusRegister.carry ? 255 : 0);
statusRegister.carry = accLSB == 1;
setNegativeAndZeroFlags(accumulator, statusRegister);
}
public static void RLC(Accumulator accumulator, StatusRegister statusRegister)
{
byte accMSB = (byte)((int)accumulator.accumulator >> 7);
accumulator.accumulator <<= 1;
accumulator.accumulator |= (byte)(statusRegister.carry ? 1 : 0);
statusRegister.carry = accMSB == 1;
setNegativeAndZeroFlags(accumulator, statusRegister);
}
public static void PUSH(VectorStack vectorStack, Accumulator accumulator)
{
vectorStack.push(accumulator.accumulator);
}