A hypothetical computer system has a 20-bit address bus and can address an 8-bit wide memory. The memory of this computer system contains 64 Kbytes ROM and 256 Kbytes RAM. The ROM and RAM form a contiguous block of memory starting at address 0. ROM occupies the lowest address range. The rest of the address range after RAM is not used.

(i) Summarise the address space by drawing a memory map of 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.

(ii) A 32 Kbytes RAM chip is added after the highest address range of the 256 Kbytes RAM to increase the RAM memory capacity to 288 Kbytes. What is the last RAM address in hexadecimal in the memory map? Show your working.