Fundamentals of Digital Computers The mechanical computer age began with the advent of the abacus in 500 B.C by Babylonians. The abacus, which was
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2 Fundamentals of Digital Computers The mechanical computer age began with the advent of the abacus in 500 B.C by Babylonians. The abacus, which was used extensively and is still in use today, was not improved until 1642 when Blaise Pascal invented a calculator that was constructed of gears and wheels. In 1801 Joseph Jacquard use punched card as input to Jacquard s loom (computer). In 1823 Charles Babbage create Analytical Engine this engine was mechanical computer that stored digit decimal numbers and variable program. Input to this engine was through punched card. The 1800s saw advent of electrical motor (by Michael Faraday), all based on the mechanical calculator developed by Blaise Pascal. In 1889 Herman Hollerith developed the punched card for storing data. He borrowed the idea of punched card from Jacquard. In 1896 Hollerith formed a company called the Tabulating Machine Company. After a number of mergers, the Tabulating Machine Company was formed into International Business Machines Corporation (IBM). 2
3 In 1941 Zuse construct the first electronic calculating machine. His Z3 calculating computer was used in aircraft and missile design during war II. The first fixed-program electronic computer system was placed into operation in 1943 to break secret German military codes. This system was invented by Alan Tyring. Tyring called his machine Colossus. The ENIAC (Electronics Numerical Integrator and Calculator) is the first general purpose; programmable electronic computer system was developed in 1946 at the University of Pennsylvania. 3
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6 Intel 8085, an 8-bit NMOS microprocessor is available in the form of 40 Pin dual in line IC package. It is fabricated on a single LSI chip. It operates on +5 V d.c. supply. The clock speed used in this microprocessor is about 3 MHZ. General Purpose 8-bit microprocessor is capable of addressing up to 64 K bytes (i.e. 216 = bytes) of memory 6
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9 ALU The ALU perform the computing function of microprocessor. It includes the accumulator, temporary register, arithmetic & logic circuit & and five flags. Result is stored in accumulator & flags. Accumulator It is an 8-bit register that is part of ALU. This register is used to store 8-bit data & in performing arithmetic & logic operation. The result of operation is stored in accumulator. 9
10 S (Sign) flag After the execution of an arithmetic operation, if bit D 7 of the result is 1, the sign flag is set. It is used to signed number. In a given byte, if D 7 is 1 means negative number. If it is zero means it is a positive number. Z (Zero) flag The zero flag is set if ALU operation result is 0. AC (Auxiliary Carry) flag In arithmetic operation, when carry is generated by digit D3 and passed on to digit D 4, the AC flag is set. This flag is used only internally BCD operation. P (Parity) flag After arithmetic or logic operation, if result has even number of 1s, the flag is set. If it has odd number of 1s, flag is reset. C (Carry) flag If arithmetic operation result is in a carry, the carry flag is set, otherwise it is reset. 10
11 Register section It is basically a storage device and transfers data from registers by using instructions. Stack Pointer (SP) The stack pointer is also a 16-bit register which is used as a memory pointer. It points to a memory location in Read/Write memory known as stack. In between execution of program, sometime data to be stored in stack. The beginning of the stack is defined by loading a 16-bit address in the stack pointer. Program Counter (PC) This 16-bit register deals with fourth operation to sequence the execution of instruction. This register is also a memory pointer. Memory location have 16-bit address. It is used to store the execution address. The function of the program counter is to point to memory address from which next byte is to be fetched. Storage registers These registers store 8-bit data during a program execution. These registers are identified as B, C, D, E, H, L. They can be combined as register pair BC, DE and HL to perform some 16 bit operations. 11
12 Time and Control Section This unit is responsible to synchronize Microprocessor operation as per the clock pulse and to generate the control signals which are necessary for smooth communication between Microprocessor and peripherals devices. The RD bar and WR bar signals are synchronous pulses which indicates whether data is available on the data bus or not. The control unit is responsible to control the flow of data between microprocessor, memory and peripheral devices. 12
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