Computer Tech

vv Logic gates: A logic circuit the outputs depends upon the inputs according to some logic rules. Types of logic gates: ð   Basic gates/Primary/Fundamental (AND, OR, NOT, BUFFER) ð   Compound gates (NAND, NOR, XOR, XNOR) vv Universal Gate: A gate that can perform all the basic logical operation is called Universal Gate. NAND, NOR gates are Universal Gate. ¯¯ Middle of 19 th century, an English mathematician George Boole developed rules for manipulations of binary variables, known as Boolean algebra.ion. vv Sign-Magnitude Representation: Digital circuit understands only two symbol 0 and 1.Thus those are used to indicate the sign of a number. Normally an additional bit is used as the sign bit and it is placed at the most significant bit (MSB) location. A 0 is used to a positive number and A 1 is used to a negative number. This kind of representation is called a Sign –Magnitude –Representation. vv Bipolar Junction transistor:  A Bipolar Junction transistor (BJT) co

C omputer:                                                                                                                                                                 The word computer comes from the word “compute”, which means to calculate. Hence, a computer is normally considered to be a calculating device, which can perform, arithmetic operations at enormous speed. Data processing:                     The activity of processing data using a computer is called data processing. Data processing consists of three sub-activities: capturing the input data, manipulating the data and managing the output results. Characteristics of computers: (1)     Automatic, (2) Speed, (3) Accuracy, (4) Diligence, (5) versatility, (6) Power of remembering, (7) No I. Q, (8) No feelings. *** Charles Babbage, a nineteenth century Professor at Cambridge University, is considered the father of modern digital computers. *** The Electronic Numerical Integrator & Calculat