The Computer System  Components Hardware Software  Electronic device  Follows instructions Comparisons Addition Subtraction Storage

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

Answers 1. Modem 2. BIOS 3. CPU/Microprocessor 4. ROM 5. Hard Drive 6. RAM 7. Motherboard 8. Power Supply 9. Video Card 10. Port

Answers 1. Power Supply 2. Video Card 3. Sound Card 4. Modem 5. Motherboard 6. CD-ROM Drive 7. Hard Drive 8. Floppy Disk Drive 9. RAM 10. CPU/Microprocessor 11. BIOS 11. __________