{"id":1168,"date":"2016-04-09T21:38:25","date_gmt":"2016-04-09T21:38:25","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/?p=1168"},"modified":"2016-04-09T11:50:28","modified_gmt":"2016-04-09T11:50:28","slug":"higher-low-level-operations-and-computer-architecture-revision","status":"publish","type":"post","link":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2016\/04\/09\/higher-low-level-operations-and-computer-architecture-revision\/","title":{"rendered":"Higher &#8211; Low-level Operations and Computer Architecture (Revision)"},"content":{"rendered":"<ul>\n<li><strong>Virtual Machines:<\/strong> an emulation of a complete computer system which can be used to run alternative operating systems, or several copies of a single operating system<\/li>\n<li><strong>Emulators<\/strong>: software which duplicates the function of one computer system in another<\/li>\n<li><strong>Mobile Devices<\/strong>: features which require different types of software from conventional desktop systems eg touchscreen, pinch<\/li>\n<li>Binary Representation of:\n<ul>\n<li><strong>Integers<\/strong> \u2013\u00a0163:\u00a01 0 1 0 0 0 1 1<\/li>\n<li><strong>Negative Integers<\/strong> \u2013\u00a0-93:\u00a01 0 1 0 0 0 1 1<\/li>\n<li><strong>Real numbers<\/strong> \u2013\u00a016.25:\u00a0Mantissa &amp; Exponent<br \/>\nStored using a mantissa (Larger = greater accuarcy) and an exponent (Larger = greater range)<\/li>\n<li><strong>Characters<\/strong>\n<ul>\n<li><strong>ASCII<\/strong> (American Standard Code for Information Interchange) stores each letter, number or symbol using a number code from 0 to 127; ASCII uses eight bits (1s and 0s) to store each character<\/li>\n<li><strong>UNICODE<\/strong> 16bits, larger pool of characters<\/li>\n<\/ul>\n<\/li>\n<li><strong>Instructions<\/strong> &#8211; represented by machine code as 0s and 1s<\/li>\n<li><strong>Vector Graphics<\/strong> &#8211; stored as a collection of mathematically determined shapes or objects; each object in the picture has properties such as width, height, fill colour, line colour eg<br \/>\n&lt;rect height=\u201d96\u201d width=\u201d128\u201d y=\u201d3\u201d x=\u201d90\u201d stroke-width=\u201d6\u201d stroke=\u201d#cc0000\u201d fill=\u201d#ffcc33\u201d id=\u201dyellowrectangle\u201d&gt;<\/li>\n<li><strong>Bitmap Graphics<\/strong> &#8211; made up of a grid of pixels and stored in memory as a bit pattern of ones and zeros (calculations are mentioned later in this booklet)<a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2016\/04\/bm.png\"><img decoding=\"async\" data-attachment-id=\"1170\" data-permalink=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2016\/04\/09\/higher-low-level-operations-and-computer-architecture-revision\/bm\/\" 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150w, https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2016\/04\/bm.png 464w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/li>\n<li><strong>Sound<\/strong> &#8211; sample rate (the number of times the value of the signal is recorded) and its bit depth (the number of bits used to store the sample)<\/li>\n<li><strong>Video<\/strong> &#8211; storing video requires both images and sound to be stored together; files will be very large as a result so compression is always used unless the video is being recorded for editing later; each frame in an MPEG video is compressed as a JPEG; the data that stays the same in successive frames is then removed<\/li>\n<\/ul>\n<\/li>\n<li><strong>Processor<\/strong>: consists of several different parts:\n<ul>\n<li>the Arithmetic and Logic Unit which performs calculations;<\/li>\n<li>the Control Unit which loads, decodes and executes instructions,<\/li>\n<li>Registers which are small memory locations used by the processor<\/li>\n<\/ul>\n<\/li>\n<li><strong>Cache<\/strong>: a faster kind of memory which stores copies of the data from frequently used main memory locations<\/li>\n<li><strong>Read Only Memory<\/strong>: Permanent memory; data is not lost when power switched off; this memory is very important and is used to store programs, like the operating system, for a long time<\/li>\n<li><strong>Random Access Memory<\/strong>: used to hold all data required for an active program or application to run; data is transferred from backing storage to RAM and held there until it is no longer required by the processor<\/li>\n<li><strong>Address Bus<\/strong>: identify the address of the location in cache or main memory that is to be read from or written to; uni-directional<\/li>\n<li><strong>Data Bus<\/strong>: will transfer data to\/from the address that is held on the address bus; bi-directional; the amount of data that can be carried by the data bus depends on the word size (width of the data bus)<\/li>\n<li><strong>Interfaces<\/strong>: used to allow peripheral devices and hardware to connect to a computer system; allow for differences in speed and the way that data is handled by each peripheral device; an example is a USB; responsible for voltage conversion, status signals, data format conversion<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Virtual Machines: an emulation of a complete computer system which can be used to run alternative operating systems, or several copies of a single operating system Emulators: software which duplicates the function of one computer system in another Mobile Devices: features which require different types of software from conventional desktop systems eg touchscreen, pinch Binary 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