Explain two advantages of memory overlay. (4 marks)DICT MOD 1 July 2020

Memory overlay is a technique that is used to allow a program to execute in a memory space that is smaller than the size of the program. It works by loading different parts of the program into memory as needed and then unloading them when they are no longer needed. There are several advantages to using memory overlay:

1. Allows execution of larger programs: By using memory overlay, it is possible to execute programs that are larger than the available memory space. This can be especially useful on systems with limited memory.
2. Increases efficiency: Memory overlay allows a program to use memory more efficiently, by only loading the parts of the program that are currently needed. This can help to reduce the amount of unused or wasted memory.
3. Improves performance: By reducing the amount of unused memory, memory overlay can improve the performance of a system by allowing it to access and manipulate data more quickly.
4. Simplifies program design: Memory overlay can simplify the design of a program by allowing it to be divided into smaller, more manageable parts. This can make it easier to develop and maintain the program.