Presentation on theme: "Introduction to Computers Chapter 2 §Computers are common in every facet of human activity. §They overcome the shortcomings of conventional radiography."— Presentation transcript:
Introduction to Computers Chapter 2 §Computers are common in every facet of human activity. §They overcome the shortcomings of conventional radiography systems l computers offer several advantages §1. They process information §2. Store that processed information §3. Retrieve what has been stored §4. Communicate information quickly and accurately
§Define computer… §A machine for solving problems. §What is a computer system? §Hardware, software, and computer users. §What is hardware? §The physical components of the machine. §What is software? §The instructions that make the hardware work to solve problems. §Why are computer users important? §They design, develop, and operate the hardware and software.
History §Computers date back over 2000 years §Today CT scanners are in their 5th generation §They are classified according to their processing capabilities, storage capacity, size, and cost. §There are four main groups...
Supercomputers §Processes data at extremely high speeds §Used in oil exploration §weather forecasts §research (especially in weapons)
Mainframes §Capable of rigorous computations at high speeds §Large primary memories and can support many pieces of peripheral equipment §Used in banks §Universities and Colleges §Large businesses and the government
Minicomputers §A midlevel computer §performs complex computations while dealing with a high level of input and output from the users §frequently connected to other minicomputers on a network §CT Scanners and MRI Scanners
Microcomputers §Personal computers - PCs §Small digital computers such as laptops and notebooks.
Binary System §Decimal system has a base of 10 l values are represented as 0 through 9 l any decimal number can be written as a sum of these digits multiplied by a power of 10. §The binary system has a base of 2 l values are represented as 0 and 1
Terminology §A binary digit, or a bit, is a single binary number §4 bits = nibble §8 bits = byte §16 bits = word §32 bits = double word §Memory capacity is measured in bytes...