ALL CLASS COMPUTER SCIENCE AND DATA PROCESSING NOTES

LOGIC GATES A logic gate is an elementary building block of a digital circuit. One of the most useful aspects of computers is their ability to make decisions. If the number of items in stock falls below a certain level, then print an order for some more. The ability to make useful decisions like this is because of special circuits in the processor. These circuits are called logic circuits. Logic circuits are made from components called logic gates. .

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EARLY METHODS OF COUNTING BODY COUNTING Fingers, toes and feet. The fingers and toes were used for counting and keeping track of days, while the feet were used to measure areas, such as land. COLLECTION COUNTING A collection of smaller objects were used to correspond with the objects counted. For example, a shepherd would keep a count of his sheep by keeping the same number of pebbles. A collection of shells, pearls, elephant teeth, sticks, or even coconuts could be used. TALLY STICK A tally stick is any piece of wood, bone, or object on which notches could be cut. Each notch corresponds to an object being counted. With tally sticks, only a small piece of wood or bone needed to be carried around for keeping track of the numbers of objects. KNOTTED STRING Knotted strings were used in the same way as tally sticks. LIMITATION OF EARLY COUNTING AND CALCULATING DEVICES They could not be used to count large numbers. The results/output could not be stored. They consumed a lot of time. The ope

  1.     ………………………………… is the word used to describe devices. These are the parts of the computer system you can touch and see .   A.     Hardware B.     Software C.     Data D.    Information 2.     …………………………… peripherals that are used to capture data and send it to a computer system. A.     Output devices B.     Input devices C.     Storage devices D.    Processing devices   3.     …………………… peripherals pass data back from a process . A.     Input devices B.     Output devices C.     Processing Devices D.    Storage devices   4.     Which of the following is the input device? A.     Harddisk B.     Monitor C.     Keyboard   D.    Printer 5.     Which of the following is the storage device?   A.     Monitor B.     Scanner C.     Mouse D.    Harddisk     1A 2B 3B 4C 5D