How many bits are required to address a 16 mega on 16 bits (16 m x 16 bits) main memory if a) main memory is byte addressable? b) main memory is word addressable? 2. suppose that a 64 mega x 16 bits main memory is built using 512 kx 8 bits chips of ram and memory is word addressable a) how many ram chips are necessary? b) how many ram chips are needed for each memory word? c) how many address bits are needed for each ram chip? d) how many address bits are needed for all memory?