15. Assume a 220 byte memory. a) What are the lowest and highest addresses if memory is byte addressable? b) What are the lowest and highest addresses if memory is word addressable, assuming a 16-bit word? re the lowest and highest addresses if memory is word addressable assuming a 32-bit 18. Given a memory of 2048 bytes consisting of several 64 x 8 RAM chips, and assuming byte- addressable memory, which of the following seven diagrams indicates the correct way to use the address bits? Explain your answer. 10-bit address a) 2 bits for chip select a) 2 bits for chip select 8 bits for address on chip 64-bit address- b) 16 bits for chip select 48 bits for address on chip 11-bit address c) 6 bits for chip select 5 bits for address on chip 6-bit address d) 1 bit for chip select 5 bits for address on chip 11-bit address e) 5 bits for chip select 6 bits for address on chip 10-bit address f 4 bits for chip select 6 bits for address on chip 64-bit address g) 8 bits for chip select 56 bits for address on chip 22. List the hexadecimal code for the following program (hand assemble it) Hex Address Label Instruction 100 101 102 103 LOAD A ADD ONE JUMP S1 ADD ONE S2, 104 105 106 107 108 109 STORE A HALT ADD A JUMP S.2 HEX 0023 HEX 0001 S1, One