9 What is a computer? Computer is a electronic devices that process data, converting it information that is useful to people.
10 Data Representation All computers are based on the binary number system A bit or binary digit has one of two values, zero or one A byte is the smallest addressable unit of memory (8 bits) ASCII provides for 256 (or 2 8 ) characters 01000001 – A 01000010 – B etc. Unicode 16-32 bits (Chinese, Japanese, Spanish, French,…..) EDBDIC used in mainframe or supercomputer
11 Software The instructions tell a computer what to do Software = program Two type of software: System software Operating system Utilities Device driver Application software General purpose Specialized application
12 System Software Operating System Managing resources - memory, processing, storage, and devices such as printers and monitors. Provide user interface – How the user interacts with the computer. Almost all newer operating systems use a graphical user interface (GUI). Running applications - load and run applications such as word processors and spreadsheets. Most operating systems support multitasking, or the ability to switch between different applications stored in memory.
15 Application software Application software consists of programs designed to make users more productive and/or assist with personal tasks. General Application Software Browser Internal Explorer Firefox Safari
16 Application software Specialized Software MS Office– Word, Excel, Access, and PowerPoint Word processing software allows users to create and manipulate documents Spreadsheet software allows users to organize data in rows and columns and perform calculations. Charting depicts data in a spreadsheet in graphical form Presentation software allows users to create visual aids for presentations to communicate ideas, messages, and other information to a group Audio & Video Software – Final Cut Pro ( Mac) Graphics program – Photoshop, Corel Draw Web authoring tools and programs – DreamWeaver
17 Software licensees A contract distributed with a program that gives you the right to install and use the program on only one computer. Type of licensees Single user license, Volume license Site license Shareware Freeware Electronic software distribution
29 Sound inputs Computer equipped with sound cards can accept sound input with microphone Popular sound formats Windows WAV, AU sounds, MPEG – MP3/4. Voice/ Speech recognition Accept the spoken word by using microphone and then converting into binary code for processing in the computer
44 Document files Word processor file – memo, letters E.g. MS WORD, Pages (Mac) Spreadsheet file – sales analysis, budget E.g. MS Excel, Numbers (Mac) Presentation file – slides, speaker notes E.g. MS PowerPoint, Keynote (Mac) Database file E.g. MS Access