Question: Suppose that a 64 Mega x 16 bits main memory is built using 16M x 8 bits chips of RAM and memory is word addressable.

  1. Suppose that a 64 Mega x 16 bits main memory is built using 16M x 8 bits chips of RAM and memory is word addressable.

  1. How many RAM chips are necessary? ______
  2. How many RAM chips are needed for each memory word? _______
  3. How many address bits are needed for each RAM chip? _______
  4. How many address bits are needed for all memory? _______

  1. A digital computer has a memory unit with 32 bits per word. The instruction set consists of 127 different operations. All instructions have an operation code part (opcode), and an address part (allowing for only one address). Each instruction is stored in one word of memory.

  1. How many bits are needed for the opcode? ________
  2. How many bits are left for the address part of the instruction? _______
  3. What is the maximum allowable size for memory? _________

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