1. From Chapter 1 - Computers- Understanding Technology
Our Digital World
From Chapter 1 - Computers- Understanding Technology

2. Digital vs. Analog
Digital means an electronic signal that is processed, sent, and stored in discrete parts (bits) rather than an analog signal, which is a series of electronic pulses in a continuous wave

3. What is a Computer?
Operates under control of a set of instructions, that is stored in its memory
Accepts data from a user
Manipulates the data according to the programmed instructions
Produces the results
Stores the results for future use

4. Special-Purpose vs. General- Purpose Computers
Special-purpose, or embedded computers, perform a few specific actions whereas general purpose computers can perform a wide range of actions
Examples of special purpose computers would include digital thermometer, microwave oven, digital camera

5. Information Processing Cycle
Input
Processing
Output
Storage

6. Computer Hardware Components
Input Devices (Chapter 2)
Central Processing Unit (CPU) (Chapter 2)
Memory (Chapter 2)
Output Devices (Chapter 3)
Storage Devices (Chapter 3)
Communications Devices

7. Computer Software
System software (Chapter 4) - Operating system (e.g. Windows, Macintosh) and utility software (e.g. file backup, virus protection)
Application software (Chapter 5) – Office software, browsers, etc.
Communications software (Chapter 5)

8. Categories of Computers
Personal computers – desktop, laptop, notebook, handheld (personal digital assistant)
Workstation – look like PCs but more powerful
Midrange server or minicomputer
Mainframe computer
Supercomputer