By Sylvia Langfield, Dave Duddell
Cambridge foreign AS and a degree computing device technological know-how deals a whole set of assets to accompany the 9608 syllabus. This coursebook can provide an available consultant to the theoretical and useful abilities which are required through the direction, with a transparent development of initiatives that consolidate and strengthen wisdom. It bargains scholars unique descriptions of the recommendations, strengthened with examples that define complicated subject material in a transparent manner. along primary definitions, larger point programming abilities are constructed during the clarification of methods and consolidated via sensible exam-type questions for college students to try.
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02. 02 that the most significant bit or bits identify the class. A group of the next most sign ifican t bits define the netlD and the remaining, least sign ificant, bits define the hostlD. Th e rationale was straightforwa rd. The largest organ isations would be allocated to Class A. e. 128 of these but t here could be 224 dist in ct hosts for each of them . e. 256 hosts. ----- - - -- - -- - I f Chapter 2: Communication and Internet Technologies The problems w ith this scheme arose once LANs supporting PCs became commonp lace.
Tones but a printer at any position on a page could only print black or nothing. The solution to this was halftoning. This technique approximated a grey tone by printing an array of black dots; varying the size of the dots changed the tone displayed. The technique, of course, relies on the limitations of the human eye which does not register the individual dots if they are suffic iently small. A variation of this technique is used in computer graphic presentation. Normally, neither screen nor printer technology can produce varying size dots but the same effect can be produced by varying the number of dots created in what can be described as a halftone cell.
Th e platters spin in un ison . The read-write heads are attached to act uator arms wh ich allow the heads to move over the surfaces of the platte rs. The motion of each actuator head is synchronised with the motion of the other heads. A cush ion of air ensures that a head does not touch a platter surface. 02 A schematic drawing of the components of a hard disk drive The logical construction is that data is stored in concentric tracks . Each track consists of a sequence of bits but these are formatted into sectors where each sector conta ins a defined • Cambridge International AS and A level Computer Science number of bytes.
