The Computer System

Components Hardware Software

Electronic deviceFollows instructions

ComparisonsAdditionSubtractionStorage

Cover & Frame Cover

Protect inside parts from• Dust• Damage

Frame Provides support for system unit

Power Supply Plugs into the electrical outlet Provides electric current for main

computer system Unit Keyboard Mouse Monitor

Motherboard Aka Systems board Connects all parts together Contains the

Microprocessor/CPU BIOS Cache Memory

CPU=Central Processing Unit

Microprocessor Located on motherboard A single silicon chip Brain of the computer—programmable

device that accepts digital data Identified by manufacturer

AMD Intel

BIOS Basic Input/Output System Software hardwired on motherboard Purpose—to start up the computer First software run when PC powered on

Hard Disk Drive (HDD) Introduced by IBM in 1956 Data storage device Data on rapidly rotation disc (Platters) Can contain up to eight disks Can read & write data to surface No external Port

Magnetic head

Actuator Arm

Computer Memory ROM—Read-Only Memory

RAM—Random-Access Memory

ROM Developed in 1980’s Non-volatile

Hold data permanently on the chip Not lost when power is turned off

Changing ROM Physically change the computer chip Best to replace the chip

RAM Developed in 1951 Volatile

Holds data temporarily Lost when power is off

Type SIMM (Single In line Memory Module) DIMM (Double In Line Memory Module)

Secondary Memory Devices Floppy Drive

CD ROM/DVD Drive

Data Belts

Connect secondary storage devices to the motherboard

Allow data to travel from storage to RAM so it can be edited

Data travels in batches or buses back and forth from RAM to storage

Expansion Cards Circuit Cards Allow you to connect (plug in) peripheral

devices to your computer Card attaches directly to motherboard at

an expansion card slot Include

Modem—telephone/internet Video—monitor (blue) Sound—speakers

Ports Special socket in computer Attaches cable/device to computer Types

Openings in back of computer USB ports

Modem Modem is a device that allows a computer to

transmit data through telephone or cable lines (wires). External modems (box outside of main computer) Internal modems (a type of expansion card)

Computer sends digital signals Telephone lines carry voices—analog signals Modulator-Demodulator = MODEM

Modulate—digital to analog Demodulate—analog to digital

Modulate

Demodulate

How A Modem Works

Answers1. Modem2. BIOS3. CPU/Microprocessor4. ROM5. Hard Drive6. RAM7. Motherboard8. Power Supply9. Video Card10. Port

Answers1. Power Supply2. Video Card3. Sound Card4. Modem5. Motherboard6. CD-ROM Drive7. Hard Drive8. Floppy Disk Drive9. RAM10. CPU/Microprocessor11. BIOS

11. __________