Module 3.4
Task 6- Memory


A.M.D.G.

ROM - Read Only Memory - is used in the computer to hold the important instructions that are used to start up the machine. This bootstrap loader is also known as the BIOS, the Basic Input/Output System since they contain instructions that check all the devices that are connected to the motherboard.

Of more importance, however, when considering a computer system is the amount of RAM, Random Access Memory.

RAM is volatile, that is, when the computer is switched off all information is lost. That is why you must save information you wish to keep on some form of backing storage.

Once the computer is switched on RAM is used to store sections of the operating system, running applications and any open documents.

Memory is organised in a way that allows the computer to store and retrieve information. Memory is divided into lots of memory locations. Each location has a unique memory address to allow the computer to know where data items are stored. This method of dividing memory into many uniquely named locations is known as addressability.

There is a direct link between processor and memory that 'points' to a particular memory location. Then the contents of that location can be sent to the processor.

  • Research on the internet to find descriptions of the following types of memory:
    • SIMM
    • DIMM
    • SRAM
    • DRAM
    • DDRAM
    • PROM
    • EPROM
    • EEPROM
  • Write descriptions of two other types of memory.

Answer the following questions in your jotter.

1. Why can increasing the amount of RAM in your computer system improve the system performance?

2. Why can increasing the amount of RAM in your computer system sometimes fail to improve system performance?

3. Why is it necessary to have a direct link between processor and memory?