ALU run operations addition, subtraction, and other simple operations on the inputs and provide the results to the output registers. In the development of modern computers, each processor consists of the above:Īrithmetic and logic unit Arithmetic and Logic Unit or function to perform all arithmetic calculation (math) and the logic that occurs in accordance with the instructions of the program. These parts are interconnected by wire beam, “bus”.
Von Neumann architecture describes a computer with four main sections: Arithmetic and Logic Unit (ALU), control unit, memory, and input and output devices (collectively termed I / O). This architecture is used by almost all computers today. Von Neumann architecture (or Von Neumann machine) is an architecture that was created by John von Neumann (1903-1957).
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Step 6, The last step is from cpu register we have content pc is 303, AC is 0005, and IR is 2941, so from cpu register have ac 0005 will be move in memory change hexadecimal 941 = 0002 become 941 = 0005. Step 5 is pc have content 302 after that hexadecimal is 2941 so move in IR, and AC is still 0005. Pc have content 302 so the hexadecimal is 2941 but the IR is still 5941, and Ac will be change become 0005 ?, where we can find 0005 ?, 0005 is sum from hexadecimal 940 is 0003 and hexadecimal from 941 is 0002 so the result is 0003 + 0002 = 0005. the content pc is 301, and the content from AC still 0003. Step 3 actually almost same with step 1, pc have content 301 and change hexadecimal become 5941 and will be move in cpu register the place is IR. In step 2 ac(temporary storage) have content 0003, why ?, because the last 3 digit is a 940 is 0003, and the hexadecimal is 1940 so we using 940 because the last 3 digit number from hexadecimal 1940 is 940 and 940 have content 0003. Number 1940 will be move in the cpu register in the IR(instruction register). First step is pc have content 300, where 300 is first command from memory, after that command will be change become hexadecimal in the memory, so number 300 become 1940. (IR) _ Instruction being executed Accumulator 
Program counter (PC) _ Address of instruction Instruction register
Example of Program Execution (contents of memory and registers in hexadecimal)
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