Computer Systems Nat 45 Computing Science Section 2

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Computer Systems Nat 4/5 Computing Science Section 2 Computer Structure: Lesson 2 : Memory

Computer Systems Nat 4/5 Computing Science Section 2 Computer Structure: Lesson 2 : Memory

Lesson Aims By the end of this lesson: Pupils will be able to: ü

Lesson Aims By the end of this lesson: Pupils will be able to: ü Describe the difference between main memory and backing storage ü Describe some of the features and uses of RAM and ROM ü Describe what is meant by a memory address

Nat 4/5 A quick recap Backing Storage Input Devices Processor ROM Output Devices RAM

Nat 4/5 A quick recap Backing Storage Input Devices Processor ROM Output Devices RAM Memory We are going to look at the Backing Storage and Memory

Nat 4/5 Main Memory memory falls into two types: RAM Random Access Memory ROM

Nat 4/5 Main Memory memory falls into two types: RAM Random Access Memory ROM Read Only Memory

Nat 4/5 RAM – Random Access Memory Nothing to do with male sheep! RAM

Nat 4/5 RAM – Random Access Memory Nothing to do with male sheep! RAM is the computers short term memory. If a machine is quoted as having 2 GB of Ram then it has 2 GB into which programs and the operating system are loaded into. RAM is volatile. This means that it requires power to store data. When power is lost the contents of RAM are lost.

Nat 4/5 ROM – Read Only Memory There is a problem with just having

Nat 4/5 ROM – Read Only Memory There is a problem with just having RAM. If the contents of RAM are lost then the power is Iost how does the computer know what to do when it switches on? ROM (Read Only Memory) is memory that will always retain its contents even when power is lost. This concept can be used by mobile phones to store their operating systems.

Nat 4/5 Addressability Your No This house has a unique address two houses have

Nat 4/5 Addressability Your No This house has a unique address two houses have the same address! is the same for memory Each location has a unique address

Nat 4/5 Backing Storage Backing storage are devices used to store permanent copies of

Nat 4/5 Backing Storage Backing storage are devices used to store permanent copies of our files. Examples are such as: Hard Disk Drives USB Flash Drives Magnetic Tapes CD/DVD R/RW At More on these later! this point in the course knowing their purpose is sufficient.

Nat 4/5 Summary RAM (Random Access Memory) ROM (Read Only Memory) Is used to

Nat 4/5 Summary RAM (Random Access Memory) ROM (Read Only Memory) Is used to store programs and the operating system Is volatile, it loses contents when there is no power Contents cannot be changed and does not require power to hold data Backing Storage devices are used to store permanent copies of our files and data

Network Address Translation NAT 1 NAT NAT deviceNetwork Address Translation NAT 1 NAT NAT device
NAT Network Address Translation NAT 64 NAT 6NAT Network Address Translation NAT 64 NAT 6
Nat Turner 1831 Nat Turner Why was NatNat Turner 1831 Nat Turner Why was Nat
Nat Int Nat Int nat 2 int ZeroNat Int Nat Int nat 2 int Zero
Nat Int Nat Int nat 2 int ZeroNat Int Nat Int nat 2 int Zero
Nat Int Nat Int nat 2 int ZeroNat Int Nat Int nat 2 int Zero
Computer Systems Nat 45 Computing Science Computer StructureComputer Systems Nat 45 Computing Science Computer Structure
Computer Systems Nat 45 Computing Science Data RepresentationComputer Systems Nat 45 Computing Science Data Representation