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A laptop computer or notebook computer, also known as a laptop or notebook, is a small, portable personal computer (PC). Laptops typically have a clamshell form factor with a flat-panel screen on the inside of the upper lid and an alphanumeric keyboard and pointing device on the inside of the lower lid.
Portable computers are also called a "transportable" or a "luggable" PC. A personal digital assistant (PDA) is a small, usually pocket-sized, computer with limited functionality. It is intended to supplement and to synchronize with a desktop computer, giving access to contacts, address book, notes, e-mail, and other features. A Palm TX PDA
R2E CCMC Portal laptop. The portable microcomputer "Portal", of the French company R2E Micral CCMC, officially appeared in September 1980 at the Sicob show in Paris.The Portal was a portable microcomputer designed and marketed by the studies and developments department of the French firm R2E Micral in 1980 at the request of the company CCMC specializing in payroll and accounting.
Internal components accumulate dust brought in by the airflow maintained by fans to keep the PC from overheating. A soft brush may remove loose dirt; the remainder is dislodged with compressed air and removed with a low-pressure vacuum. The case is wiped down with a cleaning agent.
The Compaq Portable, one of the first IBM PC compatible systems A military-type mobile computer housed in a reinforced case A portable computer with three LCD screens A portable computer with one 20.1-inch LCD screen, EATX motherboard The MIT Suitcase Computer, MIT Digital Systems Laboratory, 1975
A human computer, with microscope and calculator, 1952. It was not until the mid-20th century that the word acquired its modern definition; according to the Oxford English Dictionary, the first known use of the word computer was in a different sense, in a 1613 book called The Yong Mans Gleanings by the English writer Richard Brathwait: "I haue [] read the truest computer of Times, and the best ...
Program vs. Process vs. Thread Scheduling, Preemption, Context Switching. In computing, a process is the instance of a computer program that is being executed by one or many threads.
Threads have their own thread ID, program counter (PC), a register set, and a stack, but share code, heap data, and other resources with other threads of the same process. [87] [88] Thus, there is less overhead to create a thread than a new process. [89] On single-CPU systems, concurrency is switching between processes.