Question

A 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 of ROM and 256 Kbytes of RAM. The ROM and RAM form a contiguous block of memory starting at address 0.

1. What is the maximum number of addressable memory locations can this computer system address? Give your answer in power of 2.

2. Draw a memory map for the computer system. Indicate the starting and ending addresses in hexadecimal for each block of memory and any unused space.

Answer 1

I Rom. word size - Bboil = 1B. Addrey bus is 20 bits. RAM is of 64KB) meaning we need 16 bits to addren RAM ROM is of 64 KB, meaning we need 16 bits to addren Rom Let addressing the Rom starts at o. DO000 H OOOO IH OFFFFH 1 0 OOOH 1 000 TH - RAM FFFFH 20000 H - Unused. FFFFFH since there are 20 bits for adcrening, The maximum number of addrenable memory locations are 220. This is how the memory looks (Memory Map).