UD2             Undefined Instruction                Flags: Not altered

UD2                                                  CPU: PPro+

        Logic   Generate invalid opcode exception

    Generates an invalid opcode. This instruction is provided for
    software testing to explicitly generate an invalid opcode. The
    opcode for this instruction is reserved for this purpose.

    Other than raising the invalid opcode exception, this instruction is
    the same as the NOP instruction.


    Exceptions (All Operating Modes)
    #UD Instruction is guaranteed to raise an invalid opcode exception
    in all operating modes).


    Opcode      Format
    0F 0B       UD2


    Length and timing
    Operands    Bytes   8088    186     286     386     486     Pentium
    -           2       -       -       -       -       -       -