Bits vs Bytes o A bit is a
Bits vs Bytes o A bit is a unit of data in the binary numbering system. o It can either be 0 or 1 o A byte is the unit that describes a single character in the computer
Meaning of Storage Size Terms Number of Bytes Term 1024 1 kilobyte 1, 048, 576 1 megabyte (MB) 1, 073, 741, 824 1 gigabyte (GB) 1, 099, 511, 627, 776 1 terabyte (TB)
Classes of Computers o Analog o Digital o Hybrid
Types of Computers o o Supercomputers Mainframes Microcomputers Handheld Computers
Basics of Computer Network o A network is a set of cooperative interconnected computers for the purpose of information interchange. o Most important components of network hardware are: n Adapter or interface card n Cabling n Server
Server o For a network to exist, there must be a server. Most networks today use the client/server approach; wherein one computer is the core or server computer that receives requests from the client(user) computer and fulfills those requests
Topology o Defines how the network computers in a LAN are interconnected within a physical interconnection o Topologies include: n BUS n STAR n RING
Computer Software and Systems
Software o General term applied to the instructions that direct the computer’s hardware to perform work
Types of Software o Systems Software o Application Software o Programming Languages
Operating System o A program that acts as an intermediary between the computer hardware and the users of the computer. o Examples are: n n DOS Windows OS UNIX LINUX
Windows desktop
Utility Programs o Are programs designed to enhanced the functions of the OS or perhaps to add facilities that the basic OS does not offer
Language Translation Programs o Compilers o Interpreters
Programming Language o Presents a simplified means, called a language, to execute a series of instructions. o It consists of a vocabulary and an accompanying set of rules that tell the computer how to work. o Permits user to develop programs that do specific tasks
Calculator Program
Another Calculator Program
A screen shot of the code of the modified calculator program
Common Software Useful to Nurses o Admission, discharge and transfer (ADT) systems that help with patient tracking and medication administration record (MAR) software o Charting software o Computer Physician Order Entry (CPOE) o Hospital E-mail system
Common Software Useful to Nurses o Chat Rooms o Electronic Bulletin Boards o Listserv
Computer Systems o System Elements: 1. 2. 3. 4. 5. 6. Set of interdependent parts Input System processes Output of the system System control feedback
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