G043 – Lecture 02 Inside A Desktop PC Mr C Johnston ICT Teacher

Session Objectives Know the components which make up a basic computer, Know the different types of port on a modern PC and what they are typically used for, Know the different types of cables used to assemble a PC.

Back to Basics Computers operate in bits – electric pulses of either 1s or 0s, How Binary Works Video Computer storage are measured in bytes which are groups of 8 bytes, As computer storage requirements so have the units: KiloByte (KB) – Digital 1000 Bytes/Binary 1024 Bytes MegaByte (MB) – Digital 1,000,000 Bytes/Binary 1,048,576 Bytes GigaByte (GB) – Digital 1,000,000,000 Bytes/Binary 1,073,741,824 Bytes Computer processor speeds are measured in Hz (cycles per second)

Basic Requirements INPUT DEVICES PROCESSING OUTPUT DEVICES STORAGE

Hardware Requirements Video To Show How A Computer Works System Case Power Supply Mother Board Processor HDD RAM Optical Disk Drive Input Devices Output Devices

Types of Port Serial (9 / 25 pin male) – mice + other serial peripherals - obsolete Parallel (25 pin female) – used for old printers - obsolete Games / MIDI Port (15 pin female) – Joy sticks / MIDI devices - obsolete PS2 6pin mini DIN – normally used for mouse and keyboard USB 1/1.1 (12 mbps) – original USB port ok for mice and keyboards but little slow for today's devices USB 2 (480 mbps) - used by most devices today – allows high speed data transfer – more popular than FireWire IEEE 1394 FireWire (400mbps) – very fast port used to transfer data typically for high quality video capture RJ-45 Socket (10/100/1000mbps) – used for network cable connection RJ-11 Socket (56kbps) – used for telephone cable connection HDMI (gbps) – high definition multimedia interface – transfers video and audio in a single cable in high definition

Types of Cable IDE Cable (40pin female) – used to connect HDD and Optical Drives to the motherboard SATA Cable - used to connect modern internal hard disk drives and optical drives to the motherboard Optical Drive Audio Cable – Connects drive to sound card so sound can be heard from it, Serial cable– used to connect devices to serial port Parallel cable – used to connect devices to parallel port USB cable – used to connect devices to USB port – plug is always the same to connect into USB socket but different types fit into devices FireWire Cable – used to connect devices to FireWire port Ethernet Cable – used to connect computers to a network HDMI Cable – used to connect HD video and audio equipment together

Topic Exercise Download the topic exercise and complete it using the internet to assist you, Save it within a sensible place as it will be useful when completing the assignment.