... register ARn, n = 0-7, is modified, the displacementdisp is either a constant (0-255) or the contents of one of the two index registers IR0, IR1 in the registerfile. If the displacement is missing, ... a 32-bit result. In this case, the registers used can be any of the registers in the registerfile.Theothermajorpart oftheCPU istheALU.TheALU canalsotakeinputsfromeitherthememoryorc1999 by ... “opcode” of the instruction. The opcode is the unique identifier of the instruction. The next four bits, 1000, are the shift of the operand. Then there is one bit (zero inthis case) to signal that the...