(b) No. 1 2 A computer system has a 20-bit address bus and can address an 8-bit wide memory. The memory of this computer system contains 128 Kbytes of ROM and 512 Kbytes of RAM. The ROM starts at address 0 and the RAM occupies the higher address range ending at address FFFFF16. Draw the memory map for the computer system. Indicate the starting and ending addresses in hexadecimal for each block of memory and any unused space. Show how the memory addresses are obtained. (11 marks) Describe the characteristics of Dynamic RAM (DRAM) and Static RAM (SRAM). Tabulate your answer by listing the similarities and differences in FOUR (4) characteristics, using the format given in Table Q4(b). Characteristics DRAM Table Q4(b) SRAM (8 marks) Explain the steps taken by the processor when the I/O module of an external device sends an interrupt request signal to the processor. (6 marks)