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A Turing machine is a hypothetical computing device, first conceived by Alan Turing in 1936. Turing machines manipulate symbols on a potentially infinite strip of tape according to a finite table of rules, and they provide the theoretical underpinnings for the notion of a computer algorithm. While none of the following models have been shown to ...
A reel-to-reel tape recorder (Sony TC-630), typical of a 1970s audiophile device. Reel-to-reel audio tape recording, also called open-reel recording, is magnetic tape audio recording in which the recording tape is spooled between reels. To prepare for use, the supply reel (or feed reel) containing the tape is placed on a spindle or hub.
With regard to what actions the machine actually does, Turing (1936) (Undecidable p. 121) states the following: "This [example] table (and all succeeding tables of the same kind) is to be understood to mean that for a configuration described in the first two columns the operations in the third column are carried out successively, and the machine then goes over into the m-configuration in the ...
Media controls on a multimedia keyboard. From top; left to right: skip backward, skip forward, stop, play/pause. Media control symbols are commonly found on both software and physical media players, remote controls, and multimedia keyboards. Their application is described in ISO/IEC 18035. [1]
Turing machines. A Turing machine is a mathematical model of computation describing an abstract machine [ 1] that manipulates symbols on a strip of tape according to a table of rules. [ 2] Despite the model's simplicity, it is capable of implementing any computer algorithm. [ 3]
The eight regions each correspond to a value which is a power of 2: Region 1 corresponds to 1 (2 0), Region 2 to 2 (2 1), Region 3 to 4 (2 2), and so on through Region 8, which corresponds to 128 (2 7). The values of each region that the disc is not encoded for are added together to give the value in the file. For example, a disc that is ...
The photographic prints produced by such machines are commonly referred to as "photostats" or "photostatic copies". The verbs "photostat", "photostatted", and "photostatting" refer to making copies on such a machine in the same way that the trademarked name "Xerox" was later used to refer to any copy made by means of electrostatic photocopying ...
QWERTY ( / ˈkwɜːrti / KWUR-tee) is a keyboard layout for Latin-script alphabets. The name comes from the order of the first six keys on the top letter row of the keyboard: Q W E R T Y. The QWERTY design is based on a layout included in the Sholes and Glidden typewriter sold via E. Remington and Sons from 1874.
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