Question

Which of the following does not need extra hardware for DRAM refreshing ?

• A. $8085$
• B. Motorola $6800$
• C. Z-$80$
• D. None of the above

Answer 1

Answer: (C)

Z-$80$

Z-80 need extra hardware for DRAM refreshing.

Dram refresh is the process of periodically reading information from an area of computer memory and immediately rewriting the read information to the same area without modification, for the purpose of preserving the information. Memory refresh is a background maintenance process required during the operation of semiconductor dynamic random-access memory (DRAM), the most widely used type of computer memory, and in fact is the defining characteristic of this class of memory.