public void SubtractDecimal(byte a, byte b, bool inputCarry,
byte resultValue, bool negative, bool overflow, bool zeroed, bool resultCarry)
{
var result = ArithmeticHelpers.SubtractDecimal(a, b, inputCarry);
result.Result.Should().Be(resultValue);
result.Carried.Should().Be(resultCarry);
result.Overflowed.Should().Be(overflow);
result.Negative.Should().Be(negative);
result.Zeroed.Should().Be(zeroed);
}
public void Execute(State state)
{
var addressingMode = OpcodeMap[state.OpCode];
var(targetAddress, canSkipCycle) = addressingMode.GetAddress(state);
var value = state.Memory[targetAddress];
state.ClockCycle += addressingMode.StandardCpuCycles - (canSkipCycle ? 1 : 0);
var arithmeticResult = state.Status.DecimalMode
? ArithmeticHelpers.SubtractDecimal(state.Registers.A, value, state.Status.Carry)
: ArithmeticHelpers.SubtractBinary(state.Registers.A, value, state.Status.Carry);
state.Registers.A = arithmeticResult.Result;
state.Status.Carry = arithmeticResult.Carried;
state.Status.Overflow = arithmeticResult.Overflowed;
state.Status.ZeroResult = arithmeticResult.Zeroed;
state.Status.NegativeResult = arithmeticResult.Negative;
}