In some architectures, notably most Reduced Instruction Set Computers, instructions are a fixed length, typically corresponding with that architecture's word size.

A computer is a machine that manipulates data according to a list of instructions. The first devices that resemble modern computers date to the mid-20th century (around 1940 - 1945 ...

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While a computer may be viewed as running one gigantic program stored in its main memory, in some systems it is necessary to give the appearance of running several programs

learn the basics on how to use a computer ... Computer Basics. I have made these pages for people learning to use the computer