Computer Hardware Information Free Online Read
Computer hardware:
usually simply called hardware when a computing context is implicit'' is the collection of physical elements that constitutes a computer system. Computer hardware is the physical parts or components of a computer, such as the monitor, mouse, keyboard, computer data storage, hard disk drive *HDD*, system unit *graphic cards, sound cards, memory, motherboard and chips*, and so on, all of which are physical objects that can be touched *that is, they are tangible* In contrast, software is instructions that can be stored and run by hardware
Case:
The computer case is a plastic or metal enclosure houses That most of it the components. Those found on desktop computers usually we are small enough to fit under a desk, in Recent years however it more compact designs Have Become more common place,: such as the all in one style designs from Apple, Namely the iMac. Laptops are computers That usually we eat in a clamshell form factor, however it again in more Recent years deviations from form factor esta Have started to emerge: such as laptops That have any available detachable screen tablet computers Become That In Their Own right.
History:
By the early 1960s computer monitoring software monitor HAD evolved from monitoring software, for example IBSYS, executive software to control. Over time, computers got faster while computer time was still neither cheap nor fully Utilized; Such an environment made possible multiprogramming multiprogramming and Means Necessary That several programs run "at the same time" or concurrently. At first, more than one program ran on a single processor, as a result of underlying uniprocessor computer architecture, And They shared scarce and limited hardware resources. Multiprogramming también está basic form of multiprocessing, Which is a much Broader term.Programs consist of sequences of instructions for processors. A single processor can run only one instruction at a time: it is impossible to run more programs at the same time. A program Might need some resource,: such as an input device, Which has a large delay, or a program Might start some slow operation,: such as sending output to a printer. This would lead to processor being "idle" unused. To keep the processor busy at all times, the execution of Such a program is halted and the operating system switches the processor to run another program. To the user, it will Appear That the programs run at the same time (Hence it the term, concurrent 'Shortly thereafter, the notion of a 'program' was expanded to the notion of an 'executing program and Its context'. The concept of a process was born.This Became Necessary With The invention of re-entrant code.Threads meat somewhat later. However, with the advent of time-sharing; computer networks; multiple-CPU, shared memory computers; etc., the old "multiprogramming" Gave way to true multitasking, multiprocessing and, later, multithreading '
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