Consider a memory system made with the following devices:

A fully address decoded ROM

512 bytes of RAM

The following is the address decode logic

romen <= '1' when ax(15 downto 12) = "1111" or

ax(15 downto 11) = "11101" else '0';

ramen <= '1' when ax(15 downto 10) = o"01" or

ax(15 downto 10) = o"02" else '0';

a) For the ROM determine the first and last address where it appears in the memory.

b) Determine the size of the ROM device and the number of address bits it has. For each of the following system addresses determine the address seen by the ROM: $E912, $F234

c) For the RAM determine the size of the region where the device appears in units of 1k and determine the number of times the RAM appears in that region

d) For each of the following system addresses determine the address seen by the RAM: $078A, $0820