Ypsilon.Emulation.Processor.YCPU.NEG C# (CSharp) Method

        private void NEG(ushort operand)
        {
            ushort value;
            RegGeneral destination;
            try {
                BitPatternALU(operand, out value, out destination);
                if (value == 0x8000) {
                    // negated value of -32768 doesn't fit in 16-bits.
                    R[(int)destination] = 0x8000;
                    FL_N = true;
                    FL_Z = false;
                    // C [Carry] Not effected.
                    FL_V = true;
                }
                else {
                    int result = 0 - value;
                    R[(int)destination] = (ushort)(result & 0x0000FFFF);
                    FL_N = (result & 0x8000) != 0;
                    FL_Z = result == 0x0000;
                    // C [Carry] Not effected.
                    FL_V = false;
                }
            }
            catch (SegFaultException e) {
                Interrupt_SegFault(e.SegmentType, operand, e.Address);
            }
        }