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Topic 1: Hardware and Software Cheat Sheet (DRAFT) by

International A-Level IT Pearson Edexcel Unit 1 - Topic 1: Hardware and Software

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Conver­sions

8 bit
1 Byte
x 8 (->­bits)
1024 Bytes
1 KibiByte (KiB)
x 1024 (->­Bytes)
1024 KibiBytes
1 MebiByte (MiB)
x 1024² (->­Bytes)
1024 MebiBytes
1 GibiByte (GiB)
x 1024³ (->­Bytes)
1024 GibiBytes
1 TebiByte (TiB)
x 1024⁴ (->­Bytes)
4 bit
1 nibble
x 4 (->­bits)
transm­ission speed = file size / time taken
image file size = height in pixles x width in pixles x bit depth(or colour depth)
text file size = number of bits per character x number of characters
sound file size = sample rate x duration x bit depth

Assess perfor­mance of digital devices

speed
capacity
portab­ility
bandwidth
power efficiency
 

Embedded System

Charac­ter­istics
Created to perform the task within a certain time frame
 
Task specific
 
High efficiency
 
Works with less power
 
High reliab­lility
 
Very Stable
 
Minimal or no user interface
 
Less expencive
 
Small sized
 
Hardware is used for security and perfor­mance
 
Software is used for features
Features and Functions
Advantages
Portable
 
High perfor­mance
 
Less energy consum­ption
Disadv­antages
Minimal or no user interface
 
No or little expansion capability
 
Security features (hardware)
Embedded Systems - programmed hardware devices that run on hardware chips, they are designed to work for single or few specific functions often within a larger system