NJCU CS 204: Finals May 15, 2018 Question Two Boolean a) Find the simplified expression for the defined by the following Kmap xlyz 0 0 01 b) Sketch the diagram of the simplified Boolean expression. c) Describe how a decoder works and indicate typical inputs and outputs. Provide a carefully labelled black box" diagram for the decoder. (5 points) Question Three A digital computer has a memory unit with 24 bits per word. The instruction set consists of 150 different operations. All instructions have an operational code part (opcode) and an address part allowing for only one address. Each instruction is stored in one word memory. a) How many bits are needed for the opcode? b) How many bits are left for the address part of the instructions? d) What is the allowable size of the memory? (5 Points) Question Four a) Explain the steps in the fetch-decode-execute cycle as applied to a Marie register. b) List the hexadecimal code for the following program: Machine code (Hex) Hex Address Label Instructions 100 101 108 Load A Add one Hex 0023 One Hex 0001 109 (4 points)