<div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://files.passeidireto.com/db84dfd8-5eec-45e1-8257-c0faba693d5e/bg1.png"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls2 ws0">Qualification</div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls2 ws0">Accredit<span class="blank _0"></span>ed</div><div class="t m0 x2 h3 y3 ff2 fs1 fc1 sc0 ls2 ws1">ocr<span class="blank _1"></span>.org<span class="blank _0"></span>.uk/gcsecomput<span class="blank _0"></span>erscience</div><div class="t m0 x3 h4 y4 ff3 fs2 fc2 sc0 ls2 ws5">Oxfor<span class="blank _0"></span>d Cambridge and RSA</div><div class="t m0 x4 h5 y5 ff4 fs1 fc0 sc0 ls2 ws5">V<span class="blank _0"></span>ersion 2.3 (F<span class="blank _2"></span>ebruar<span class="blank _3"> </span>y 2024)</div><div class="t m0 x5 h6 y6 ff2 fs3 fc3 sc0 ls3 ws2"><span class="fc4 sc0">H</span><span class="blank"> </span><span class="fc4 sc0">41</span><span class="fc4 sc0">8</span></div><div class="t m0 x5 h7 y7 ff4 fs4 fc3 sc0 ls4 ws6"><span class="fc4 sc0">F</span><span class="fc4 sc0">o</span><span class="fc4 sc0">r</span><span class="fc4 sc0"> \ue61c</span><span class="fc4 sc0">r</span><span class="blank _3"> </span><span class="fc4 sc0">s</span><span class="fc4 sc0">t</span><span class="blank _3"> </span><span class="fc4 sc0"> ass</span><span class="fc4 sc0">e</span><span class="fc4 sc0">ssm</span><span class="fc4 sc0">e</span><span class="blank _3"> </span><span class="fc4 sc0">n</span><span class="fc4 sc0">t</span><span class="fc4 sc0"> 2</span><span class="fc4 sc0">0</span><span class="blank _0"></span><span class="fc4 sc0">22</span></div><div class="t m0 x0 h8 y8 ff5 fs5 fc0 sc0 ls2 ws5"> </div><div class="t m0 x6 h9 y9 ff2 fs6 fc3 sc0 ls0 ws7">C<span class="blank _4"></span>OMPUTER<span class="blank _2"></span> </div><div class="t m0 x6 h9 ya ff2 fs6 fc3 sc0 ls0">SCIENCE</div><div class="t m0 x6 h6 yb ff2 fs3 fc3 sc0 ls2 ws3">J277</div><div class="t m0 x6 h7 yc ff5 fs4 fc3 sc0 ls2 ws5">F<span class="blank _2"></span>or first assessment in 2022</div><div class="t m0 x6 ha yd ff2 fs7 fc3 sc0 ls1 ws5">GC<span class="blank _3"> </span>S<span class="blank _3"> </span>E \ue61f9\ue61e1\ue61d</div><div class="c x6 ye w2 hb"><div class="t m0 x0 hc yf ff1 fs7 fc3 sc0 ls5 ws4">Spe<span class="blank"> </span>ci<span class="blank"> </span>f<span class="blank _5"> </span>ication</div></div><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:370.917000px;bottom:20.015700px;width:201.681000px;height:17.346000px;background-color:rgba(255,255,255,0.000001);"></div></a></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x4 y10 w3 hd" alt="" src="https://files.passeidireto.com/db84dfd8-5eec-45e1-8257-c0faba693d5e/bg2.png"><div class="t m0 x4 h7 y11 ff6 fs4 fc1 sc0 ls5 wsc">Regist<span class="blank _0"></span>ered <span class="blank _3"> </span>o\ue61fc<span class="blank _0"></span>e: </div><div class="t m2 x4 h7 y12 ff6 fs4 fc1 sc0 ls2 ws5">The T<span class="blank _1"></span>ria<span class="blank _3"> </span>ngle Building</div><div class="t m0 x7 h7 y12 ff6 fs4 fc1 sc0 ls2 ws5"> </div><div class="t m2 x4 h7 y13 ff6 fs4 fc1 sc0 ls2 ws5">Shaftesbur<span class="blank _3"> </span>y Road</div><div class="t m2 x4 h7 y14 ff6 fs4 fc1 sc0 ls2 ws8">Cambridge</div><div class="t m0 x8 h7 y14 ff6 fs4 fc1 sc0 ls2 ws5"> </div><div class="t m2 x4 h7 y15 ff6 fs4 fc1 sc0 ls2 ws5">CB2 8EA</div><div class="t m0 x4 h7 y16 ff6 fs4 fc1 sc0 ls6 ws5">OCR is an ex<span class="blank _0"></span>empt char<span class="blank _0"></span>ity<span class="blank _2"></span>.</div><div class="t m0 x4 he y17 ff6 fs4 fc1 sc0 ls7 ws9">Di<span class="blank"> </span>scla<span class="blank"> </span>i<span class="blank"> </span>m<span class="blank"> </span>e<span class="blank"> </span>r<span class="blank _6"> </span><span class="ff4 fs5 fc0 ls2 ws5 v1">Specif<span class="blank _3"> </span>ications are updated ov<span class="blank _0"></span>er time. Whilst every ef<span class="blank _3"> </span>for<span class="blank _3"> </span>t is made to check all </span></div><div class="t m0 x9 h8 y18 ff4 fs5 fc0 sc0 ls2 ws5">documents, there may be contradictions bet<span class="blank _3"> </span>ween published resources and the </div><div class="t m0 x9 h8 y19 ff4 fs5 fc0 sc0 ls2 ws5">specif<span class="blank _3"> </span>ication, therefore please use the information on the latest specif<span class="blank _3"> </span>ication at </div><div class="t m0 x9 h8 y1a ff4 fs5 fc0 sc0 ls2 ws5">all times. Where changes are made to specif<span class="blank _3"> </span>ications these will be indicated within </div><div class="t m0 x9 h8 y1b ff4 fs5 fc0 sc0 ls2 ws5">the document, there will be a new version number indicated, and a summary </div><div class="t m0 x9 h8 y1c ff4 fs5 fc0 sc0 ls2 ws5">of the changes. If you do notice a discrepancy bet<span class="blank _3"> </span>ween the spe<span class="blank _3"> </span>cification and a </div><div class="t m0 x9 h8 y1d ff4 fs5 fc0 sc0 ls2 ws5">resource please con<span class="blank _0"></span>tac<span class="blank _3"> </span>t us at: <span class="fc5 ls8 wsa">resources.fee<span class="blank"> </span>dback@<span class="blank"> </span>o<span class="blank"> </span>cr.org.uk</span></div><div class="t m0 x9 h8 y1e ff4 fs5 fc0 sc0 ls2 ws5">We wil<span class="blank _0"></span>l inform centres about changes t<span class="blank _0"></span>o specif<span class="blank _3"> </span>ications. We will al<span class="blank _0"></span>so publish </div><div class="t m0 x9 h8 y1f ff4 fs5 fc0 sc0 ls2 ws5">changes on our website<span class="blank _0"></span>. The latest version of our specif<span class="blank _3"> </span>ications will always be </div><div class="t m0 x9 h8 y20 ff4 fs5 fc0 sc0 ls2 ws5">those on our website (<span class="blank _2"></span><span class="fc5 ls8 wsb">ocr.org.uk<span class="fc0 ls9 wsd">) and t<span class="blank _0"></span>hese may differ from printed v<span class="blank _0"></span>ersions.</span></span></div><div class="t m0 x9 h8 y21 ff4 fs5 fc0 sc0 ls2 ws5">© 20<span class="blank _2"></span>24 OCR. All rights reser<span class="blank _3"> </span>ved.</div><div class="t m0 x9 h8 y22 ff4 fs5 fc0 sc0 lsa wse">Copyr<span class="blank _3"> </span>ight <span class="ls2 ws5"> </span></div><div class="t m0 x9 h8 y23 ff4 fs5 fc0 sc0 ls2 ws5">OCR retains the copyright on al<span class="blank _0"></span>l its publications, including the specif<span class="blank _3"> </span>ications. </div><div class="t m0 x9 h8 y24 ff4 fs5 fc0 sc0 ls2 ws5">However<span class="blank _1"></span>, re<span class="blank _3"> </span>gistered cen<span class="blank _0"></span>tres for OCR are permit<span class="blank _3"> </span>ted to cop<span class="blank _0"></span>y material from this </div><div class="t m0 x9 h8 y25 ff4 fs5 fc0 sc0 ls2 ws5">specif<span class="blank _3"> </span>ication book<span class="blank _3"> </span>let for their own internal use.</div><div class="t m0 x9 h8 y26 ff4 fs5 fc0 sc0 ls2 ws5">Ox<span class="blank _3"> </span>ford Cambridge and RSA is a Company Li<span class="blank _0"></span>mited by Guarantee. Registered in </div><div class="t m0 x9 h8 y27 ff4 fs5 fc0 sc0 ls8 wsf">England. Re<span class="blank _3"> </span>gistered company number 34<span class="blank _3"> </span>84<span class="blank _3"> </span>4<span class="blank _3"> </span>66.</div><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:344.910000px;bottom:245.419000px;width:129.301000px;height:12.020000px;background-color:rgba(255,255,255,0.000001);"></div></a><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:312.514000px;bottom:192.080000px;width:41.529000px;height:12.020000px;background-color:rgba(255,255,255,0.000001);"></div></a></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img fetchpriority="low" loading="lazy" class="bi x6 y28 w4 hf" alt="" src="https://files.passeidireto.com/db84dfd8-5eec-45e1-8257-c0faba693d5e/bg3.png"><div class="t m0 xa h10 y29 ff7 fs0 fc0 sc0 ls2 ws5">V<span class="blank _2"></span>ersion 2.3 © OCR 2024 <span class="blank _7"> </span>Visit <span class="fc5 ws10">ocr<span class="blank _1"></span>.org.uk/j277<span class="ff8 fc0 ws5"> for our most up-to-da<span class="blank _0"></span>te speci\ue72eca\ue79fon, support and r<span class="blank _0"></span>esources</span></span></div><div class="t m0 xa h10 y2a ff7 fs0 fc0 sc0 ls2 ws5">GCSE (9\u20131) in Computer Science <span class="blank _8"> </span>1</div><div class="t m0 xa h11 y2b ff7 fs7 fc3 sc0 ls2 ws11">Cont<span class="blank _2"></span>ents</div><div class="t m0 xb h12 y2c ff7 fs1 fc0 sc0 ls2 ws5">1 <span class="blank _9"> </span>Wh<span class="blank _0"></span>y choose an OCR GCSE (9\u20131) in Computer Science?<span class="fs8 fc6 ws20"> 2</span></div><div class="t m0 xc h13 y2d ff9 fs8 fc0 sc0 ls2 ws12">1a.\ue603<span class="blank"> </span>Why\ue603choose\ue603an\ue603OCR\ue603quali\ue72ec<span class="blank _0"></span>a\ue79fon?\ue603<span class="blank _a"> </span><span class="ffa fc6">2</span></div><div class="t m0 xc h13 y2e ffa fs8 fc0 sc0 ls2 ws5">1b. <span class="blank _b"> </span>Aims and learning outcomes <span class="blank _c"> </span><span class="fc6">3</span></div><div class="t m0 xc h13 y2f ff9 fs8 fc0 sc0 ls2 ws13">1c.\ue603<span class="blank"> </span>What\ue603ar<span class="blank _0"></span>e\ue603the\ue603k<span class="blank _0"></span>ey\ue603f<span class="blank _2"></span>eatures\ue603of\ue603this\ue603speci\ue72eca\ue79fon?\ue603<span class="blank _d"> </span><span class="ffa fc6">3</span></div><div class="t m0 xc h13 y30 ff9 fs8 fc0 sc0 ls2 ws14">1d.\ue603<span class="blank"> </span>How\ue603do\ue603I\ue603\ue72end\ue603out\ue603more\ue603inf<span class="blank _2"></span>orma\ue79fon?\ue603<span class="blank _e"> </span><span class="ffa fc6">3</span></div><div class="t m0 xb h12 y31 ff8 fs1 fc0 sc0 ls2 ws5">2 <span class="blank _9"> </span>The speci\ue72eca\ue79fon o<span class="blank _0"></span>verview <span class="ff7 fs8 fc6 ws21"> 5</span></div><div class="t m0 xc h13 y32 ffa fs8 fc0 sc0 ls2 ws5">2a. <span class="blank _9"> </span>OCR\u2019<span class="blank _2"></span>s GCSE (9\u20131) in Computer Science (J277) <span class="blank _f"> </span><span class="fc6">5</span></div><div class="t m0 xc h13 y33 ffa fs8 fc0 sc0 ls2 ws5">2b. <span class="blank _b"> </span>Conten<span class="blank _0"></span>t of Computer s<span class="blank _0"></span>ys<span class="blank _0"></span>tems (J277/01) <span class="blank _10"> </span><span class="fc6">6</span></div><div class="t m0 xc h13 y34 ff9 fs8 fc0 sc0 ls2 ws15">2c.\ue603<span class="blank _11"> </span>Conten<span class="blank _0"></span>t\ue603of\ue603Computa\ue79fonal\ue603thinking,\ue603algorithms\ue603and\ue603pr<span class="blank _0"></span>ogramming\ue603(J277/02)\ue603<span class="blank _12"> </span><span class="ffa fc6">15</span></div><div class="t m0 xc h13 y35 ff9 fs8 fc0 sc0 ls2 ws14">2d.\ue603<span class="blank"> </span>Prac\ue79fc<span class="blank _0"></span>al\ue603Progr<span class="blank _2"></span>amming\ue603skills\ue603<span class="blank _13"> </span><span class="ffa fc6">22</span></div><div class="t m0 xc h13 y36 ff9 fs8 fc0 sc0 ls2 ws16">2e.\ue603<span class="blank"> </span>Prior\ue603knowledge,\ue603learning\ue603and\ue603pr<span class="blank _0"></span>ogression\ue603<span class="blank _14"> </span><span class="ffa fc6">22</span></div><div class="t m0 xb h12 y37 ff7 fs1 fc0 sc0 ls2 ws5">3 <span class="blank _9"> </span>Assessment of GCSE (9\u20131) in Comput<span class="blank _0"></span>er Science<span class="fs8 fc6 ws22"> 23</span></div><div class="t m0 xc h13 y38 ffa fs8 fc0 sc0 ls2 ws5">3a. <span class="blank _9"> </span>Forms of assessment <span class="blank _15"> </span><span class="fc6">23</span></div><div class="t m0 xc h13 y39 ff9 fs8 fc0 sc0 ls2 ws14">3b.\ue603<span class="blank"> </span>Assessment\ue603of\ue603Pr<span class="blank _0"></span>ac\ue79fcal\ue603Pr<span class="blank _0"></span>ogramming\ue603skills:\ue603Componen<span class="blank _0"></span>t\ue6032\ue603\ue603<span class="blank _16"> </span><span class="ffa fc6">24</span></div><div class="t m0 xc h13 y3a ffa fs8 fc0 sc0 ls2 ws5">3c. <span class="blank _11"> </span>OCR Exam R<span class="blank _2"></span>efer<span class="blank _0"></span>ence Language <span class="blank _17"> </span><span class="fc6">25</span></div><div class="t m0 xc h13 y3b ffa fs8 fc0 sc0 ls2 ws5">3d. <span class="blank _b"> </span>Command words <span class="blank _18"> </span><span class="fc6">32</span></div><div class="t m0 xc h13 y3c ff9 fs8 fc0 sc0 ls2 ws16">3e.\ue603<span class="blank"> </span>Assessment\ue603Objec\ue79fves\ue603<span class="blank _19"> </span><span class="ffa fc6">34</span></div><div class="t m0 xc h13 y3d ff9 fs8 fc0 sc0 ls2 ws17">3f<span class="blank _1"></span>.\ue603<span class="blank"> </span>T<span class="blank _1"></span>otal\ue603quali\ue72eca<span class="blank _0"></span>\ue79fon\ue603\ue79fme\ue603<span class="blank _19"> </span><span class="ffa fc6">34</span></div><div class="t m0 xc h13 y3e ff9 fs8 fc0 sc0 ls2 ws18">3g.\ue603\ue603<span class="blank"> </span>Quali\ue72eca\ue79fon\ue603a<span class="blank _0"></span>vailability\ue603outside\ue603of\ue603England\ue603<span class="blank _1a"> </span><span class="ffa fc6">34</span></div><div class="t m0 xc h13 y3f ffa fs8 fc0 sc0 ls2 ws23">3h. Language <span class="blank _1b"> </span><span class="fc6">35</span></div><div class="t m0 xc h13 y40 ff9 fs8 fc0 sc0 ls2 ws19">3i.\ue603<span class="blank"> </span>Assessment\ue603a<span class="blank _0"></span>vailability\ue603<span class="blank _1c"> </span><span class="ffa fc6">35</span></div><div class="t m0 xc h13 y41 ff9 fs8 fc0 sc0 ls2 ws1a">3j.\ue603<span class="blank"> </span>Re<span class="blank _0"></span>taking\ue603the\ue603quali\ue72eca<span class="blank _0"></span>\ue79fon\ue603<span class="blank _1d"> </span><span class="ffa fc6">35</span></div><div class="t m0 xc h13 y42 ffa fs8 fc0 sc0 ls2 ws5">3k. <span class="blank _1e"> </span>Assessment of e<span class="blank _0"></span>xtended response <span class="blank _1f"> </span><span class="fc6">35</span></div><div class="t m0 xc h13 y43 ff9 fs8 fc0 sc0 ls2 ws19">3l.\ue603<span class="blank"> </span>Mathema\ue79fc<span class="blank _0"></span>al\ue603skills\ue603requir<span class="blank _0"></span>ement\ue603<span class="blank _20"> </span><span class="ffa fc6">35</span></div><div class="t m0 xc h13 y44 ff9 fs8 fc0 sc0 ls2 ws1b">3m.\ue603<span class="blank"> </span>Synop\ue79fc\ue603assessmen<span class="blank _0"></span>t\ue603\ue603<span class="blank _21"> </span><span class="ffa fc6">35</span></div><div class="t m0 xc h13 y45 ff9 fs8 fc0 sc0 ls2 ws14">3n.\ue603<span class="blank"> </span>Calcula\ue79fng\ue603quali\ue72eca<span class="blank _0"></span>\ue79fon\ue603result\ue603<span class="blank _22"> </span><span class="ffa fc6">35</span></div><div class="t m0 xb h12 y46 ff8 fs1 fc0 sc0 ls2 ws5">4 <span class="blank _9"> </span>Admin: what y<span class="blank _0"></span>ou need to know<span class="ff7 fs8 fc6 ws24"> 36</span></div><div class="t m0 xc h13 y47 ffa fs8 fc0 sc0 ls2 ws25">4a. Pre-assessmen<span class="blank _0"></span>t <span class="blank _23"> </span><span class="fc6">36</span></div><div class="t m0 xc h13 y48 ff9 fs8 fc0 sc0 ls2 ws14">4b.\ue603<span class="blank"> </span>Special\ue603consider<span class="blank _0"></span>a\ue79fon\ue603\ue603<span class="blank _24"> </span><span class="ffa fc6">37</span></div><div class="t m0 xc h13 y49 ffa fs8 fc0 sc0 ls2 ws5">4c. <span class="blank _11"> </span>External assessment arr<span class="blank _2"></span>angements <span class="blank _25"> </span><span class="fc6">37</span></div><div class="t m0 xc h13 y4a ff9 fs8 fc0 sc0 ls2 ws14">4d.\ue603<span class="blank"> </span>Prac\ue79fc<span class="blank _0"></span>al\ue603Progr<span class="blank _2"></span>amming\ue603skills\ue603administra<span class="blank _0"></span>\ue79fon\ue603requiremen<span class="blank _0"></span>ts\ue603<span class="blank _26"> </span><span class="ffa fc6">38</span></div><div class="t m0 xc h13 y4b ff9 fs8 fc0 sc0 ls2 ws16">4e.\ue603<span class="blank"> </span>Results\ue603and\ue603cer\ue79f\ue72ec<span class="blank _0"></span>ates\ue603<span class="blank _1c"> </span><span class="ffa fc6">38</span></div><div class="t m0 xc h13 y4c ff9 fs8 fc0 sc0 ls2 ws1c">4f<span class="blank _1"></span>.\ue603<span class="blank _27"> </span>Pos<span class="blank _0"></span>t<span class="blank _2"></span>-results\ue603services\ue603<span class="blank _28"> </span><span class="ffa fc6">39</span></div><div class="t m0 xc h13 y4d ff9 fs8 fc0 sc0 ls2 ws1d">4g.\ue603<span class="blank"> </span>Malprac\ue79fce\ue603\ue603<span class="blank _29"> </span><span class="ffa fc6">39</span></div><div class="t m0 xb h12 y4e ff7 fs1 fc0 sc0 ls2 ws26">5 Appendices<span class="fs8 fc6 ws27"> 40</span></div><div class="t m0 xc h13 y4f ffa fs8 fc0 sc0 ls2 ws5">5a. <span class="blank _9"> </span>Grade descriptor<span class="blank _2"></span>s <span class="blank _2a"> </span><span class="fc6">40</span></div><div class="t m0 xc h13 y50 ff9 fs8 fc0 sc0 ls2 ws14">5b.\ue603<span class="blank"> </span>Overlap\ue603with\ue603other\ue603quali\ue72eca<span class="blank _0"></span>\ue79fons\ue603<span class="blank _2b"> </span><span class="ffa fc6">41</span></div><div class="t m0 xc h13 y51 ffa fs8 fc0 sc0 ls2 ws28">5c. Accessibility <span class="blank _2c"> </span><span class="fc6">41</span></div><div class="t m0 xc h13 y52 ff9 fs8 fc0 sc0 ls2 ws14">5d.\ue603<span class="blank"> </span>Mathema\ue79fc<span class="blank _0"></span>al\ue603skills\ue603requir<span class="blank _0"></span>ement\ue603<span class="blank _20"> </span><span class="ffa fc6">41</span></div><div class="t m0 xb h12 y53 ff7 fs1 fc0 sc0 ls2 ws5">6 <span class="blank _9"> </span>Summary of updat<span class="blank _0"></span>es<span class="fs8 fc6 ws29"> 42</span></div><div class="t m0 xc h13 y54 ff9 fs8 fc0 sc0 ls2 ws1e">J277:\ue603Summary\ue603of\ue603updates\ue603<span class="blank"> </span><span class="ffa fc6">42</span></div><div class="t m0 xc h13 y55 ff9 fs8 fc0 sc0 ls2 ws1f">J276\ue603to\ue603J277:\ue603Summary\ue603of\ue603updat<span class="blank _0"></span>es\ue603\u2013\ue603k<span class="blank _0"></span>ey\ue603changes\ue603<span class="blank"> </span><span class="ffa fc6">44</span></div><div class="t m0 xb h12 y56 ff8 fs1 fc0 sc0 ls2 ws5">7 <span class="blank _9"> </span>P<span class="blank _0"></span>athw<span class="blank _2"></span>ays f<span class="blank _0"></span>or Compu\ue79fng<span class="ff7 fs8 fc6 ws2a"> 45</span></div><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:294.660000px;bottom:33.592900px;width:50.684000px;height:11.105400px;background-color:rgba(255,255,255,0.000001);"></div></a><a class="l" data-dest-detail="[4,"Fit"]"><div class="d m1" style="border-style:none;position:absolute;left:51.862200px;bottom:717.352000px;width:490.275800px;height:19.435000px;background-color:rgba(255,255,255,0.000001);"></div></a><a class="l" data-dest-detail="[4,"Fit"]"><div class="d m1" style="border-style:none;position:absolute;left:81.862200px;bottom:703.302000px;width:460.275800px;height:14.728000px;background-color:rgba(255,255,255,0.000001);"></div></a><a class="l" data-dest-detail="[5,"Fit"]"><div class="d m1" 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T<span class="blank _2e"></span>o join our training (either </div><div class="t m0 x11 h13 y62 ffa fs8 fc0 sc0 ls2 ws5">face-t<span class="blank _0"></span>o-f<span class="blank _0"></span>ace or online) or to sear<span class="blank _0"></span>ch for tr<span class="blank _2"></span>aining </div><div class="t m0 x11 h13 y63 ff9 fs8 fc0 sc0 ls2 ws2b">materials,\ue603y<span class="blank _2"></span>ou\ue603can\ue603\ue72end\ue603what\ue603you\u2019<span class="blank _0"></span>re\ue603looking\ue603f<span class="blank _2"></span>or\ue603</div><div class="t m0 x11 h13 y64 ffa fs8 fc0 sc0 lsb ws30">at <span class="ff9 fc5 ls2 ws2b">www<span class="blank _2"></span>.ocr<span class="blank _2e"></span>.org.uk/quali\ue72eca\ue79fons/</span></div><div class="t m0 x11 h13 y65 ff9 fs8 fc5 sc0 ls2 ws2b">prof<span class="blank _2"></span>essional-development</div><div class="t m0 x10 h13 y67 ff9 fs8 fc0 sc0 ls2 ws1c">\u2022\ue603<span class="blank _b"> 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class="t m0 x10 h17 y94 ffa fs4 fc0 sc0 ls2 ws5">\u2022 <span class="blank _30"> </span><span class="fs8">unders<span class="blank _0"></span>tand the componen<span class="blank _0"></span>ts that mak<span class="blank _2"></span>e up </span></div><div class="t m0 x11 h13 y95 ff9 fs8 fc0 sc0 ls2 ws2b">digital\ue603s<span class="blank _0"></span>yst<span class="blank _2"></span>ems,\ue603and\ue603how\ue603they\ue603communicat<span class="blank _0"></span>e\ue603</div><div class="t m0 x11 h13 y96 ffa fs8 fc0 sc0 ls2 ws5">with one another and with other sy<span class="blank _0"></span>stems</div><div class="t m0 x10 h17 y97 ffa fs4 fc0 sc0 ls2 ws5">\u2022 <span class="blank _30"> </span><span class="fs8">unders<span class="blank _0"></span>tand the impacts of digital t<span class="blank _2"></span>echnology <span class="blank _3"> </span> </span></div><div class="t m0 x11 h13 y98 ff9 fs8 fc0 sc0 ls2 ws2b">to\ue603the\ue603individual\ue603and\ue603to\ue603wider\ue603society</div><div class="t m0 x10 h17 y99 ffa fs4 fc0 sc0 ls2 ws5">\u2022 <span class="blank _30"> </span><span class="ff9 fs8 ws2b">apply\ue603mathema\ue79fc<span class="blank _0"></span>al\ue603skills\ue603relev<span class="blank _0"></span>ant\ue603t<span class="blank _0"></span>o\ue603Computer\ue603</span></div><div class="t m0 x11 h13 y9a ffa fs8 fc0 sc0 ls2">Science.</div><div class="t m0 xa h13 y9b ffa fs8 fc0 sc0 ls2 ws5">The k<span class="blank _2"></span>ey featur<span class="blank _2"></span>es of OCR\u2019<span class="blank _2"></span>s GCSE (9\u20131) in Computer </div><div class="t m0 xa h13 y9c ff9 fs8 fc0 sc0 ls2 ws2b">Science\ue603for\ue603y<span class="blank _2"></span>ou\ue603and\ue603your\ue603students\ue603are:</div><div class="t m0 xa h13 y9d ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>a\ue603simple\ue603and\ue603intui\ue79fve\ue603assessmen<span class="blank _0"></span>t\ue603model,\ue603</div><div class="t m0 xf h13 y9e ff9 fs8 fc0 sc0 ls2 ws2b">consis\ue79fng\ue603of\ue603tw<span class="blank _0"></span>o\ue603papers,\ue603one\ue603f<span class="blank _2"></span>ocusing\ue603<span class="ffa ws5">on </span></div><div class="t m0 xf h13 y9f ffa fs8 fc0 sc0 ls2 ws5">computer s<span class="blank _2"></span>ystems and one with a f<span class="blank _2"></span>ocus on </div><div class="t m0 xf h13 ya0 ff9 fs8 fc0 sc0 ls2 ws32">progr<span class="blank _2"></span>amming<span class="blank"> </span>,\ue603computa\ue79fonal\ue603thinking,<span class="ffa ws5"> and </span></div><div class="t m0 xf h13 ya1 ff9 fs8 fc0 sc0 ls2 ws2b">algorithms.\ue603Both\ue603papers\ue603ha<span class="blank _2"></span>ve\ue603iden\ue79fcal\ue603</div><div class="t m0 xf h13 ya2 ff9 fs8 fc0 sc0 ls2 ws2b">weigh\ue79fng\ue603and\ue603mark\ue603alloc<span class="blank _0"></span>a\ue79fons</div><div class="t m0 xa h13 ya3 ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>a\ue603speci\ue72eca\ue79fon\ue603dev<span class="blank _0"></span>eloped\ue603with\ue603teacher<span class="blank _0"></span>s\ue603</div><div class="t m0 xf h13 ya4 ff9 fs8 fc0 sc0 ls2 ws2b">speci\ue72ecally\ue603f<span class="blank _0"></span>or\ue603teacher<span class="blank _0"></span>s.\ue603The\ue603speci\ue72eca\ue79fon\ue603<span class="ffa ws5"> </span></div><div class="t m0 xf h13 ya5 ffa fs8 fc0 sc0 ls2 ws5">lay<span class="blank _0"></span>s out the subject cont<span class="blank _0"></span>ent clearly</div><div class="t m0 xa h13 ya6 ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>a\ue603\ue747exible\ue603support\ue603pack<span class="blank _0"></span>age\ue603f<span class="blank _2"></span>ormed\ue603a\ue74cer\ue603</div><div class="t m0 xf h13 ya7 ffa fs8 fc0 sc0 ls2 ws5">listening t<span class="blank _0"></span>o teacher<span class="blank _0"></span>s\u2019 needs. The support </div><div class="t m0 xf h13 ya8 ffa fs8 fc0 sc0 ls2 ws5">packag<span class="blank _0"></span>e will enable teacher<span class="blank _0"></span>s to easily </div><div class="t m0 xf h13 ya9 ffa fs8 fc0 sc0 ls2 ws5">unders<span class="blank _0"></span>tand the r<span class="blank _0"></span>equirements of the </div><div class="t m0 xf h13 yaa ff9 fs8 fc0 sc0 ls2 ws2b">quali\ue72eca\ue79fon\ue603and\ue603how\ue603it\ue603is\ue603assessed</div><div class="t m0 x10 h13 y9b ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>a\ue603team\ue603of\ue603OCR\ue603Subject\ue603Advisor<span class="blank _0"></span>s\ue603who\ue603support\ue603</div><div class="t m0 x11 h13 y9c ff9 fs8 fc0 sc0 ls2 ws2b">teacher<span class="blank _0"></span>s\ue603directly\ue603and\ue603manage\ue603the\ue603quali\ue72ec<span class="blank _0"></span>a\ue79fon\ue603</div><div class="t m0 x11 h13 yab ff9 fs8 fc0 sc0 ls2 ws2b">na\ue79fonally</div><div class="t m0 x10 h13 y9e ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>the\ue603speci\ue72eca\ue79fon\ue603has\ue603been\ue603designed\ue603t<span class="blank _0"></span>o\ue603</div><div class="t m0 x11 h13 y9f ff9 fs8 fc0 sc0 ls2 ws2b">transi\ue79fon\ue603seamlessly\ue603in<span class="blank _0"></span>to\ue603Computer\ue603Science\ue603<span class="ffa ws5"> </span></div><div class="t m0 x11 h13 ya0 ff9 fs8 fc0 sc0 ls2 ws2b">at\ue603AS\ue603Lev<span class="blank _0"></span>el\ue603and/or\ue603A\ue603Lev<span class="blank _0"></span>el<span class="ffa">.</span></div><div class="t m0 x10 h13 ya2 ff9 fs8 fc0 sc0 ls2 ws2b">This\ue603speci\ue72eca\ue79fon/quali\ue72eca<span class="blank _0"></span>\ue79fon\ue603will\ue603enable\ue603students\ue603<span class="ffa ws5"> </span></div><div class="t m0 x10 h13 yac ff9 fs8 fc0 sc0 ls2 ws2b">to\ue603dev<span class="blank _0"></span>elop:\ue603</div><div class="t m0 x10 h13 ya4 ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>valuable\ue603thinking\ue603and\ue603pr<span class="blank _0"></span>ogramming\ue603skills\ue603<span class="ffa ws5"> </span></div><div class="t m0 x11 h13 ya5 ff9 fs8 fc0 sc0 ls2 ws2b">that\ue603are\ue603e<span class="blank _2"></span>xtremely\ue603a\ue7a9r<span class="blank _0"></span>ac\ue79fve\ue603in\ue603the\ue603modern\ue603</div><div class="t m0 x11 h13 yad ffa fs8 fc0 sc0 ls2 ws2f">workplace</div><div class="t m0 x10 h13 ya7 ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>a\ue603deep\ue603unders<span class="blank _0"></span>tanding\ue603of\ue603comput<span class="blank _0"></span>a\ue79fonal\ue603</div><div class="t m0 x11 h13 ya8 ffa fs8 fc0 sc0 ls2 ws5">thinking and how to apply it thr<span class="blank _0"></span>ough a chosen </div><div class="t m0 x11 h13 ya9 ffa fs8 fc0 sc0 ls2 ws5">progr<span class="blank _2"></span>amming language.</div><div class="t m0 xa h14 yae ff8 fs9 fc6 sc0 ls2 ws5">1c. <span class="blank _31"> </span>What ar<span class="blank _0"></span>e the k<span class="blank _2"></span>ey f<span class="blank _0"></span>eatur<span class="blank _0"></span>es of this speci\ue72eca<span class="blank _0"></span>\ue79fon?</div><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:294.660000px;bottom:33.592900px;width:50.684000px;height:11.105400px;background-color:rgba(255,255,255,0.000001);"></div></a></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf6" class="pf w0 h0" data-page-no="6"><div class="pc pc6 w0 h0"><img fetchpriority="low" loading="lazy" class="bi x0 y28 w5 hf" alt="" src="https://files.passeidireto.com/db84dfd8-5eec-45e1-8257-c0faba693d5e/bg6.png"><div class="t m0 xd h15 y58 ffc fsa fc3 sc0 ls2">1</div><div class="t m0 xa h10 y29 ff7 fs0 fc0 sc0 ls2 ws5">Visit <span class="fc5 ws10">ocr<span class="blank _1"></span>.org.uk/j277<span class="ff8 fc0 ws5"> for our most up-to-da<span class="blank _0"></span>te speci\ue72eca\ue79fon, support and r<span class="blank _0"></span>esources <span class="blank _7"> </span>V<span class="blank _2"></span>ersion 2.3 © OCR 2024<span class="ff7"> </span></span></span></div><div class="t m0 xa h10 y2a ff7 fs0 fc0 sc0 ls2 ws5">4 <span class="blank _8"> </span>GCSE (9\u20131) in Computer Science</div><div class="t m0 xa h14 yaf ff8 fs9 fc6 sc0 ls2 ws5">1d. <span class="blank _2f"> </span>How do I \ue72end out more in<span class="blank _0"></span>f<span class="blank _0"></span>orma\ue79fon?</div><div class="t m0 xa h13 yb0 ff9 fs8 fc0 sc0 ls2 ws2b">Whether\ue603you\ue603ar<span class="blank _0"></span>e\ue603an\ue603exis<span class="blank _0"></span>\ue79fng\ue603OCR\ue603centr<span class="blank _0"></span>e,\ue603or\ue603new\ue603to\ue603</div><div class="t m0 xa h13 yb1 ff9 fs8 fc0 sc0 ls2 ws2b">OCR\ue603and\ue603would\ue603lik<span class="blank _2"></span>e\ue603to\ue603start\ue603deliv<span class="blank _0"></span>ering\ue603this\ue603cour<span class="blank _0"></span>se,\ue603</div><div class="t m0 xa h13 yb2 ff9 fs8 fc0 sc0 ls2 ws2b">please\ue603visit\ue603<span class="ffa fc5 ws2f">www<span class="blank _2"></span>.ocr<span class="blank _2e"></span>.org.uk<span class="fc0 ws5">. Or you c<span class="blank _0"></span>an cont<span class="blank _0"></span>act us </span></span></div><div class="t m0 xa h13 yb3 ffa fs8 fc0 sc0 ls2 ws5">directly by email or phone.</div><div class="t m0 x10 h13 yb0 ff9 fs8 fc0 sc0 ls2 ws2b">Contact\ue603de<span class="blank _0"></span>tails:</div><div class="t m0 x10 h13 yb4 ff9 fs8 fc0 sc0 ls2 ws2b">Email:\ue603<span class="ffa fc5 ws2f">computer<span class="blank _2"></span>science@ocr<span class="blank _2e"></span>.org.uk</span></div><div class="t m0 x10 h13 yb5 ff9 fs8 fc0 sc0 ls2 ws2b">Subject\ue603web\ue603page:\ue603<span class="fc5">www<span class="blank _1"></span>.ocr<span class="blank _2e"></span>.org.uk/c<span class="blank _0"></span>ompu\ue79fng</span></div><div class="t m0 x10 h13 yb6 ff9 fs8 fc0 sc0 ls2 ws2b">T<span class="blank _2"></span>wi\ue7a9er:\ue603<span class="ffa fc5">@ocr_ict</span></div><div class="t m0 x10 h13 yb7 ff9 fs8 fc0 sc0 ls2 ws2b">Customer\ue603Con<span class="blank _0"></span>tact\ue603Cen<span class="blank _0"></span>tre:\ue60301223\ue603553998</div><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:64.433600px;bottom:33.592900px;width:50.683400px;height:11.105400px;background-color:rgba(255,255,255,0.000001);"></div></a><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:100.504000px;bottom:662.785000px;width:69.926000px;height:12.606000px;background-color:rgba(255,255,255,0.000001);"></div></a><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:337.324000px;bottom:671.785000px;width:130.259000px;height:12.606000px;background-color:rgba(255,255,255,0.000001);"></div></a><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:391.502000px;bottom:652.785000px;width:121.768000px;height:12.606000px;background-color:rgba(255,255,255,0.000001);"></div></a><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:344.301000px;bottom:633.785000px;width:40.460000px;height:12.606000px;background-color:rgba(255,255,255,0.000001);"></div></a></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf7" class="pf w0 h0" data-page-no="7"><div class="pc pc7 w0 h0"><img fetchpriority="low" loading="lazy" class="bi x6 y28 w5 hf" alt="" src="https://files.passeidireto.com/db84dfd8-5eec-45e1-8257-c0faba693d5e/bg7.png"><div class="t m0 x13 h15 yb8 ffd fsa fc3 sc0 ls2">2</div><div class="t m0 xa h10 y29 ff7 fs0 fc0 sc0 ls2 ws5">V<span class="blank _2"></span>ersion 2.3 © OCR 2024 <span class="blank _7"> </span>Visit <span class="fc5 ws10">ocr<span class="blank _1"></span>.org.uk/j277<span class="ff8 fc0 ws5"> for our most up-to-da<span class="blank _0"></span>te speci\ue72eca\ue79fon, support and r<span class="blank _0"></span>esources</span></span></div><div class="t m0 xa h10 y2a ff7 fs0 fc0 sc0 ls2 ws5">GCSE (9\u20131) in Computer Science <span class="blank _8"> </span>5</div><div class="t m0 xa h13 yb9 ffa fs8 fc0 sc0 ls2 ws5">Students tak<span class="blank _2"></span>e J277/01 and J277/02 to be aw<span class="blank _0"></span>arded the OCR GCSE (9\u20131) in Computer Science. </div><div class="t m0 x14 h18 yba ff8 fsb fc0 sc0 ls2 ws5">Cont<span class="blank _2"></span>ent Overview<span class="blank _32"> </span>Assessment Ov<span class="blank _0"></span>erview</div><div class="t m0 x15 h16 ybb ff7 fs8 fc0 sc0 ls2 ws5">J277/01: Computer s<span class="blank _0"></span>yst<span class="blank _0"></span>ems</div><div class="t m0 x15 h13 ybc ff9 fs8 fc0 sc0 ls2 ws2b">This\ue603component\ue603will\ue603assess:\ue603</div><div class="t m0 x15 h13 ybd ffa fs8 fc0 sc0 ls2 ws5">\u2022 <span class="blank _b"> </span>1.1 Syst<span class="blank _0"></span>ems archit<span class="blank _0"></span>ecture </div><div class="t m0 x15 h13 ybe ffa fs8 fc0 sc0 ls2 ws5">\u2022 <span class="blank _b"> </span>1.2 Memory and stor<span class="blank _0"></span>age </div><div class="t m0 x15 h13 ybf ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>1.3\ue603Computer\ue603netw<span class="blank _0"></span>orks,\ue603connec\ue79fons\ue603and\ue603</div><div class="t m0 xc h13 yc0 ffa fs8 fc0 sc0 ls2 ws5">prot<span class="blank _0"></span>ocols </div><div class="t m0 x15 h13 yc1 ffa fs8 fc0 sc0 ls2 ws5">\u2022 <span class="blank _b"> </span>1.4 Network security </div><div class="t m0 x15 h13 yc2 ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>1.5\ue603Sys<span class="blank _2"></span>tems\ue603so\ue74cware\ue603</div><div class="t m0 x15 h13 yc3 ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>1.6\ue603Ethical,\ue603leg<span class="blank _2"></span>al,\ue603cultural\ue603and\ue603envir<span class="blank _2"></span>onmental\ue603</div><div class="t m0 xc h13 yc4 ffa fs8 fc0 sc0 ls2 ws5">impacts of digital technology </div><div class="t m0 x16 h16 ybb ff8 fs8 fc0 sc0 ls2 ws5">W<span class="blank _0"></span>ri\ue7a9en paper: 1 hour and 30 minut<span class="blank _0"></span>es </div><div class="t m0 x16 h16 yc5 ff7 fs8 fc0 sc0 ls2 ws5">50% of total GCSE</div><div class="t m0 x16 h16 yc6 ff7 fs8 fc0 sc0 ls2 ws5">80 marks </div><div class="t m0 x16 h13 yc7 ffa fs8 fc0 sc0 ls2 ws5">This is a non-calculat<span class="blank _0"></span>or paper<span class="blank _2e"></span>. </div><div class="t m0 x16 h13 yc8 ff9 fs8 fc0 sc0 ls2 ws2b">All\ue603ques\ue79fons\ue603are\ue603manda<span class="blank _0"></span>tory<span class="blank _1"></span>.\ue603</div><div class="t m0 x16 h13 yc9 ff9 fs8 fc0 sc0 ls2 ws2b">This\ue603paper\ue603consists\ue603of\ue603mul\ue79fple\ue603choice\ue603ques<span class="blank _0"></span>\ue79fons,\ue603</div><div class="t m0 x16 h13 yca ff9 fs8 fc0 sc0 ls2 ws2b">short\ue603response\ue603ques<span class="blank _0"></span>\ue79fons\ue603and\ue603extended\ue603r<span class="blank _0"></span>esponse\ue603</div><div class="t m0 x16 h13 ycb ff9 fs8 fc0 sc0 ls2 ws2b">ques\ue79fons.</div><div class="t m0 x15 h16 ycc ff8 fs8 fc0 sc0 ls2 ws5">J277/02: Computa\ue79fonal thinking, algorithms and </div><div class="t m0 x15 h16 ycd ff7 fs8 fc0 sc0 ls2 ws2f">progr<span class="blank _2"></span>amming</div><div class="t m0 x15 h13 yce ff9 fs8 fc0 sc0 ls2 ws2b">This\ue603component\ue603will\ue603assess:</div><div class="t m0 x15 h13 ycf ffa fs8 fc0 sc0 ls2 ws5">\u2022 <span class="blank _b"> </span>2.1 Algorithms </div><div class="t m0 x15 h13 yd0 ffa fs8 fc0 sc0 ls2 ws5">\u2022 <span class="blank _b"> </span>2.2 Progr<span class="blank _0"></span>amming fundamentals </div><div class="t m0 x15 h13 yd1 ffa fs8 fc0 sc0 ls2 ws5">\u2022 <span class="blank _b"> </span>2.3 Producing robus<span class="blank _0"></span>t progr<span class="blank _2"></span>ams </div><div class="t m0 x15 h13 yd2 ffa fs8 fc0 sc0 ls2 ws5">\u2022 <span class="blank _b"> </span>2.4 Boolean logic </div><div class="t m0 x15 h13 yd3 ffa fs8 fc0 sc0 ls2 ws5">\u2022 <span class="blank _b"> </span>2.5 Progr<span class="blank _0"></span>amming languages and Int<span class="blank _0"></span>egra<span class="blank _0"></span>ted </div><div class="t m0 xc h13 yd4 ff9 fs8 fc0 sc0 ls2 ws2b">Developmen<span class="blank _0"></span>t\ue603Envir<span class="blank _0"></span>onments\ue603</div><div class="t m0 x16 h16 ycc ff8 fs8 fc0 sc0 ls2 ws5">W<span class="blank _0"></span>ri\ue7a9en paper: 1 hour and 30 minut<span class="blank _0"></span>es </div><div class="t m0 x16 h16 ycd ff7 fs8 fc0 sc0 ls2 ws5">50% of total GCSE</div><div class="t m0 x16 h16 yd5 ff7 fs8 fc0 sc0 ls2 ws5">80 marks<span class="ffa"> </span></div><div class="t m0 x16 h13 yd6 ffa fs8 fc0 sc0 ls2 ws5">This is a non-calculat<span class="blank _0"></span>or paper<span class="blank _2e"></span>. </div><div class="t m0 x16 h13 yd7 ff9 fs8 fc0 sc0 ls2 ws2b">This\ue603paper\ue603has\ue603two\ue603sec\ue79fons:\ue603Sec\ue79fon\ue603A\ue603and\ue603</div><div class="t m0 x16 h13 yd8 ff9 fs8 fc0 sc0 ls2 ws2b">Sec\ue79fon\ue603B.\ue603Students\ue603must\ue603answ<span class="blank _0"></span>er\ue603both\ue603sec\ue79fons.\ue603</div><div class="t m0 x16 h13 yd9 ff9 fs8 fc0 sc0 ls2 ws2b">All\ue603ques\ue79fons\ue603are\ue603manda<span class="blank _0"></span>tory<span class="blank _1"></span>.\ue603</div><div class="t m0 x16 h13 yda ff9 fs8 fc0 sc0 ls2 ws2b">In\ue603Sec\ue79fon\ue603B,\ue603ques<span class="blank _0"></span>\ue79fons\ue603assessing\ue603students\u2019\ue603ability\ue603t<span class="blank _0"></span>o\ue603</div><div class="t m0 x16 h13 ydb ff9 fs8 fc0 sc0 ls2 ws2b">write\ue603or\ue603r<span class="blank _0"></span>e\ue72ene\ue603algorithms\ue603mus<span class="blank _0"></span>t\ue603be\ue603answer<span class="blank _0"></span>ed\ue603using\ue603</div><div class="t m0 x16 h16 ydc ff7 fs8 fc0 sc0 ls2 ws2f">either<span class="ffa ws5"> the OCR Exam R<span class="blank _2"></span>efer<span class="blank _0"></span>ence Language <span class="ff7 ws2f">or</span> the </span></div><div class="t m0 x16 h13 ydd ff9 fs8 fc0 sc0 ls2 ws2b">high-level\ue603pr<span class="blank _0"></span>ogr<span class="blank _0"></span>amming\ue603language\ue603they\ue603ar<span class="blank _0"></span>e\ue603familiar\ue603</div><div class="t m0 x16 h13 yde ffa fs8 fc0 sc0 ls2 ws5">with. </div><div class="t m0 xa h14 ydf ff7 fs9 fc6 sc0 ls2 ws5">2a. <span class="blank _2d"> </span>OCR\u2019<span class="blank _1"></span>s GCSE (9\u20131) in Comput<span class="blank _0"></span>er Science (J277)</div><div class="t m0 xa h11 ye0 ff8 fs7 fc3 sc0 ls2 ws5">2 <span class="blank _b"> </span>The speci\ue72eca<span class="blank _0"></span>\ue79fon ov<span class="blank _0"></span>erview </div><div class="t m0 x17 h16 ye1 ff8 fs8 fc0 sc0 ls2 ws5">Prac\ue79fc<span class="blank _0"></span>al Progr<span class="blank _2"></span>amming</div><div class="t m0 x17 h13 ye2 ff9 fs8 fc0 sc0 ls2 ws2b">All\ue603students\ue603mus<span class="blank _0"></span>t\ue603be\ue603given\ue603the\ue603opportunity\ue603to\ue603undert<span class="blank _2"></span>ake\ue603a\ue603pr<span class="blank _0"></span>ogramming\ue603t<span class="blank _2"></span>ask(s),\ue603either\ue603to\ue603a\ue603speci\ue72eca\ue79fon\ue603or\ue603</div><div class="t m0 x17 h13 ye3 ff9 fs8 fc0 sc0 ls2 ws2b">to\ue603solve\ue603a\ue603pr<span class="blank _2"></span>oblem\ue603(or\ue603problems),\ue603during\ue603their\ue603course\ue603of\ue603s<span class="blank _0"></span>tudy<span class="blank _1"></span>.\ue603\ue603Students\ue603may\ue603dr<span class="blank _2"></span>aw\ue603on\ue603some\ue603of\ue603the\ue603conten<span class="blank _0"></span>t\ue603</div><div class="t m0 x17 h13 ye4 ff9 fs8 fc0 sc0 ls2 ws2b">in\ue603both\ue603components\ue603when\ue603eng<span class="blank _2"></span>aged\ue603in\ue603Prac\ue79fcal\ue603Pr<span class="blank _0"></span>ogr<span class="blank _0"></span>amming.\ue603</div><div class="t m0 x17 h13 ye5 ff9 fs8 fc0 sc0 ls2 ws2b">Please\ue603see\ue603Sec\ue79fons\ue6032d\ue603and\ue6034d\ue603for\ue603further\ue603in<span class="blank _0"></span>forma<span class="blank _0"></span>\ue79fon.</div><div class="t m0 x18 h19 ye6 ffe fsc fc4 sc1 ls2 ws33">i<span class="blank _33"></span><span class="fc3 sc0">i</span></div><a class="l"><div class="d m1" style="border-style:none;position:absolute;left:294.660000px;bottom:33.592900px;width:50.684000px;height:11.105400px;background-color:rgba(255,255,255,0.000001);"></div></a></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf8" class="pf w6 h1a" data-page-no="8"><div class="pc pc8 w6 h1a"><img fetchpriority="low" loading="lazy" class="bi x4 ye7 w7 h1b" alt="" src="https://files.passeidireto.com/db84dfd8-5eec-45e1-8257-c0faba693d5e/bg8.png"><div class="t m3 x19 h15 ye8 fff fsa fc3 sc0 ls2">2</div><div class="t m3 x6 h10 ye9 ff7 fs0 fc0 sc0 ls2 ws5">Visit <span class="fc5 ws10">ocr<span class="blank _1"></span>.org.uk/j277<span class="ff8 fc0 ws5"> for our most up-to-da<span class="blank _0"></span>te speci\ue72eca\ue79fon, support and r<span class="blank _0"></span>esources <span class="blank _7"> </span>V<span class="blank _2"></span>ersion 2.3 © OCR 2024<span class="ff7"> </span></span></span></div><div class="t m3 x1a h10 ye9 ff7 fs0 fc0 sc0 ls2 ws5">6 <span class="blank _8"> </span>GCSE (9\u20131) in Computer Science</div><div class="t m0 x1b h1c yea ff7 fs4 fc6 sc0 ls2 ws5">1.1 \u2013 Sy<span class="blank _0"></span>stems ar<span class="blank _2"></span>chitecture</div><div class="t m0 x1b h1c yeb ff7 fs4 fc3 sc0 ls2 ws5">Sub topic<span class="blank _34"> </span>Guidance</div><div class="t m0 x1b h16 yec ff7 fs8 fc0 sc0 ls2 ws5">1.1.1 <span class="blank _35"> </span>Archit<span class="blank _0"></span>ecture of the CPU</div><div class="t m0 x1b h1d yed ff10 fs8 fc0 sc0 lsc">¨<span class="ff11 lsd ws5"> <span class="ff9 ls2">The\ue603purpose\ue603of\ue603the\ue603CPU:</span></span></div><div class="t m0 x1c h13 yee ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">The f<span class="blank _0"></span>etch-e<span class="blank _0"></span>x<span class="blank _0"></span>ecute cy<span class="blank _0"></span>cle</span></div><div class="t m0 x1b h1d yef ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">Common\ue603CPU\ue603components\ue603and\ue603their\ue603func\ue79fon:</span></div><div class="t m0 x1c h13 yf0 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ff9 ws2b">ALU\ue603(Arithme<span class="blank _0"></span>\ue79fc\ue603Logic\ue603Unit)</span></div><div class="t m0 x1c h13 yf1 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">CU (Contr<span class="blank _0"></span>ol Unit)</span></div><div class="t m0 x1c h13 yf2 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Cache</span></div><div class="t m0 x1c h13 yf3 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa ws2f">Regis<span class="blank _0"></span>ter<span class="blank _0"></span>s</span></div><div class="t m0 x1b h1d yf4 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">V<span class="blank _2"></span>on\ue603Neumann\ue603architectur<span class="blank _0"></span>e:</span></div><div class="t m0 x1c h13 yf5 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">MAR (Memory Address R<span class="blank _0"></span>egister)</span></div><div class="t m0 x1c h13 yf6 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">MDR (Memory Data R<span class="blank _2"></span>egister)</span></div><div class="t m0 x1c h13 yf7 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Progr<span class="blank _2"></span>am Counter</span></div><div class="t m0 x1c h13 yf8 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa ws2f">Accumulator</span></div><div class="t m0 x1d h16 yf9 ff7 fs8 fc0 sc0 ls2 ws2f">Requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d yfa ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">What\ue603ac\ue79fons\ue603occur\ue603at\ue603each\ue603s<span class="blank _0"></span>tage\ue603of\ue603the\ue603f<span class="blank _2"></span>etch-e<span class="blank _0"></span>x<span class="blank _0"></span>ecute\ue603cycle</span></div><div class="t m0 x1d h1d yfb ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">The\ue603role/purpose\ue603of\ue603each\ue603componen<span class="blank _0"></span>t\ue603and\ue603what\ue603it\ue603manages,\ue603</span></div><div class="t m0 x1e h13 yfc ff9 fs8 fc0 sc0 ls2 ws2b">stor<span class="blank _2"></span>es,\ue603or\ue603controls\ue603during\ue603the\ue603f<span class="blank _2"></span>etch-ex<span class="blank _2"></span>ecute\ue603cycle</div><div class="t m0 x1d h1d yfd ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">The\ue603purpose\ue603of\ue603each\ue603regis<span class="blank _0"></span>ter<span class="blank _2e"></span>,\ue603what\ue603it\ue603stor<span class="blank _2"></span>es\ue603(data\ue603or\ue603address)\ue603</span></div><div class="t m0 x1d h1d yfe ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">The\ue603di\ue72b<span class="blank _0"></span>erence\ue603betw<span class="blank _0"></span>een\ue603storing\ue603da<span class="blank _0"></span>ta\ue603and\ue603an\ue603addr<span class="blank _0"></span>ess\ue603</span></div><div class="t m0 x1d h16 yff ff7 fs8 fc0 sc0 ls2 ws5">Not requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d y100 ff10 fs8 fc0 sc0 ls2 ws36">û\ue603<span class="blank"> </span><span class="ffa ws5">Knowledg<span class="blank _0"></span>e of passing of data be<span class="blank _0"></span>tween regis<span class="blank _2"></span>ters in each st<span class="blank _0"></span>age</span></div><div class="t m0 x1b h16 y101 ff7 fs8 fc0 sc0 ls2 ws5">1.1.2 <span class="blank _35"> </span>CPU performance</div><div class="t m0 x1b h1d y102 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">How\ue603common\ue603char<span class="blank _2"></span>acteris\ue79fcs\ue603of\ue603CPUs\ue603a\ue72b<span class="blank _0"></span>ect\ue603their\ue603perf<span class="blank _0"></span>ormance:</span></div><div class="t m0 x1c h13 y103 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Clock speed</span></div><div class="t m0 x1c h13 y104 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Cache size</span></div><div class="t m0 x1c h13 y105 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Number of cores</span></div><div class="t m0 x1d h16 y106 ff7 fs8 fc0 sc0 ls2 ws2f">Requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d y107 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Unders<span class="blank _0"></span>tanding\ue603of\ue603each\ue603char<span class="blank _2"></span>acteris\ue79fc\ue603listed</span></div><div class="t m0 x1d h1d y108 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">The\ue603e\ue72b<span class="blank _2"></span>ects\ue603of\ue603changing\ue603any\ue603of\ue603the\ue603common\ue603char<span class="blank _0"></span>acteris\ue79fcs\ue603on\ue603</span></div><div class="t m0 x1e h13 y109 ff9 fs8 fc0 sc0 ls2 ws2b">sy<span class="blank _0"></span>stem\ue603perf<span class="blank _2"></span>ormance,\ue603either\ue603individually\ue603or\ue603in\ue603combina\ue79fon</div><div class="t m0 x1b h16 y10a ff8 fs8 fc0 sc0 ls2 ws5">1.1.3\u2002Embedded sys<span class="blank _2"></span>tems</div><div class="t m0 x1b h1d y10b ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">The\ue603purpose\ue603and\ue603charact<span class="blank _0"></span>eris\ue79fcs\ue603of\ue603embedded\ue603s<span class="blank _0"></span>ys<span class="blank _0"></span>tems</span></div><div class="t m0 x1b h1d y10c ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ffa ws5">Examples of embedded s<span class="blank _2"></span>ystems</span></div><div class="t m0 x1d h16 y10d ff7 fs8 fc0 sc0 ls2 ws2f">Requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d y10e ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ffa ws5">What embedded s<span class="blank _0"></span>yst<span class="blank _0"></span>ems are</span></div><div class="t m0 x1d h1d y10f ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">T<span class="blank _2"></span>ypical\ue603charact<span class="blank _0"></span>eris\ue79fcs\ue603of\ue603embedded\ue603s<span class="blank _0"></span>ys<span class="blank _0"></span>tems</span></div><div class="t m0 x1d h1d y110 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">F<span class="blank _0"></span>amiliarity\ue603with\ue603a\ue603rang<span class="blank _0"></span>e\ue603of\ue603di\ue72b<span class="blank _0"></span>erent\ue603embedded\ue603s<span class="blank _2"></span>ystems</span></div><div class="t m0 x1f h14 y111 ff7 fs9 fc6 sc0 ls2 ws5">2b. <span class="blank _2f"> </span>Cont<span class="blank _2"></span>ent of Computer s<span class="blank _0"></span>ys<span class="blank _0"></span>tems (J277/01)</div><a class="l"><div class="d m4" style="border-style:none;position:absolute;left:33.592900px;bottom:530.842400px;width:50.683400px;height:11.105400px;background-color:rgba(255,255,255,0.000001);"></div></a></div><div class="pi" data-data="{"ctm":[0.000000,-1.000000,1.000000,0.000000,0.000000,595.276000]}"></div></div> <div id="pf9" class="pf w6 h1a" data-page-no="9"><div class="pc pc9 w6 h1a"><img fetchpriority="low" loading="lazy" class="bi x4 y112 w7 h1b" alt="" src="https://files.passeidireto.com/db84dfd8-5eec-45e1-8257-c0faba693d5e/bg9.png"><div class="t m3 x19 h15 y113 ff13 fsa fc3 sc0 ls2">2</div><div class="t m3 x6 h10 ye9 ff7 fs0 fc0 sc0 ls2 ws5">V<span class="blank _2"></span>ersion 2.3 © OCR 2024 <span class="blank _7"> </span>Visit <span class="fc5 ws10">ocr<span class="blank _1"></span>.org.uk/j277<span class="ff8 fc0 ws5"> for our most up-to-da<span class="blank _0"></span>te speci\ue72eca\ue79fon, support and r<span class="blank _0"></span>esources</span></span></div><div class="t m3 x1a h10 ye9 ff7 fs0 fc0 sc0 ls2 ws5">GCSE (9\u20131) in Computer Science <span class="blank _8"> </span>7</div><div class="t m0 x1b h1c y114 ff7 fs4 fc6 sc0 ls2 ws5">1.2 \u2013 Memory and stor<span class="blank _2"></span>age</div><div class="t m0 x1b h1c y115 ff7 fs4 fc3 sc0 ls2 ws5">Sub topic<span class="blank _34"> </span>Guidance</div><div class="t m0 x1b h16 y116 ff7 fs8 fc0 sc0 ls2 ws5">1.2.1 Primary stor<span class="blank _2"></span>age (memory)</div><div class="t m0 x1b h1d y117 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ffa ws5">The need for primary s<span class="blank _0"></span>tor<span class="blank _0"></span>age</span></div><div class="t m0 x1b h1d y118 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">The\ue603di\ue72b<span class="blank _0"></span>erence\ue603betw<span class="blank _0"></span>een\ue603RAM\ue603and\ue603ROM</span></div><div class="t m0 x1b h1d y119 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ffa ws5">The purpose of ROM in a comput<span class="blank _0"></span>er sy<span class="blank _0"></span>stem</span></div><div class="t m0 x1b h1d y11a ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ffa ws5">The purpose of RAM in a computer s<span class="blank _2"></span>ystem</span></div><div class="t m0 x1b h1d y11b ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ffa ws5">Virtual memory</span></div><div class="t m0 x1d h16 y11c ff7 fs8 fc0 sc0 ls2 ws2f">Requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d y11d ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Why\ue603c<span class="blank _0"></span>omputer<span class="blank _0"></span>s\ue603hav<span class="blank _0"></span>e\ue603primary\ue603stor<span class="blank _2"></span>age\ue603(memory)</span></div><div class="t m0 x1e h1d y11e ff10 fs8 fc0 sc0 ls2 ws37">§\ue603<span class="blank"> </span><span class="ffa ws5">How this usually consists of RAM and R<span class="blank _0"></span>OM</span></div><div class="t m0 x1d h1d y11f ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Ke<span class="blank _0"></span>y\ue603charact<span class="blank _0"></span>eris\ue79fcs\ue603of\ue603RAM\ue603and\ue603R<span class="blank _0"></span>OM</span></div><div class="t m0 x1d h1d y120 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Why\ue603virtual\ue603memory\ue603ma<span class="blank _2"></span>y\ue603be\ue603needed\ue603in\ue603a\ue603syst<span class="blank _0"></span>em</span></div><div class="t m0 x1d h1d y121 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">How\ue603virtual\ue603memory\ue603works</span></div><div class="t m0 x1e h1d y122 ff10 fs8 fc0 sc0 ls2 ws37">§\ue603<span class="blank"> </span><span class="ffa ws5">T<span class="blank _1"></span>ransf<span class="blank _2"></span>er of data between RAM and HDD when RAM is full</span></div><div class="t m0 x1b h16 y123 ff7 fs8 fc0 sc0 ls2 ws5">1.2.2 Secondary st<span class="blank _0"></span>orag<span class="blank _0"></span>e</div><div class="t m0 x1b h1d y124 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ffa ws5">The need for sec<span class="blank _0"></span>ondary stor<span class="blank _2"></span>age</span></div><div class="t m0 x1b h1d y125 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">Common\ue603types\ue603of\ue603stor<span class="blank _2"></span>age:</span></div><div class="t m0 x1c h13 y126 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ff9 ws2b">Op\ue79fcal</span></div><div class="t m0 x1c h13 y127 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ff9 ws2b">Magne\ue79fc</span></div><div class="t m0 x1c h13 y128 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Solid sta<span class="blank _0"></span>te</span></div><div class="t m0 x1b h1d y129 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">Suitable\ue603st<span class="blank _0"></span>or<span class="blank _0"></span>age\ue603devices\ue603and\ue603st<span class="blank _2"></span>orage\ue603media\ue603f<span class="blank _0"></span>or\ue603a\ue603given\ue603applica<span class="blank _0"></span>\ue79fon</span></div><div class="t m0 x1b h1d y12a ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">The\ue603advan<span class="blank _0"></span>tages\ue603and\ue603disadv<span class="blank _0"></span>ant<span class="blank _0"></span>ages\ue603of\ue603di\ue72b<span class="blank _0"></span>eren<span class="blank _0"></span>t\ue603stor<span class="blank _2"></span>age\ue603devices\ue603</span></div><div class="t m0 x1c h13 y12b ff9 fs8 fc0 sc0 ls2 ws2b">and\ue603stor<span class="blank _2"></span>age\ue603media\ue603rela\ue79fng\ue603t<span class="blank _0"></span>o\ue603these\ue603charact<span class="blank _0"></span>eris\ue79fcs:</div><div class="t m0 x1c h13 y12c ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Capacity</span></div><div class="t m0 x1c h13 y12d ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Speed</span></div><div class="t m0 x1c h13 y12e ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa ws2f">Port<span class="blank _2"></span>ability</span></div><div class="t m0 x1c h13 y12f ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa ws2f">Durability</span></div><div class="t m0 x1c h13 y130 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa ws2f">Reliability</span></div><div class="t m0 x1c h13 y131 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa ws2f">Cost</span></div><div class="t m0 x1d h16 y132 ff7 fs8 fc0 sc0 ls2 ws2f">Requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d y133 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Why\ue603c<span class="blank _0"></span>omputer<span class="blank _0"></span>s\ue603hav<span class="blank _0"></span>e\ue603secondary\ue603st<span class="blank _0"></span>orag<span class="blank _0"></span>e</span></div><div class="t m0 x1d h1d y134 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Rec<span class="blank _0"></span>ognise\ue603a\ue603rang<span class="blank _0"></span>e\ue603of\ue603secondary\ue603st<span class="blank _0"></span>orag<span class="blank _0"></span>e\ue603devices/media</span></div><div class="t m0 x1d h1d y135 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Di\ue72b<span class="blank _0"></span>erences\ue603betw<span class="blank _0"></span>een\ue603each\ue603type\ue603of\ue603stor<span class="blank _2"></span>age\ue603device/medium</span></div><div class="t m0 x1d h1d y136 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Compare\ue603adv<span class="blank _0"></span>antag<span class="blank _0"></span>es/disadvan<span class="blank _0"></span>tages\ue603f<span class="blank _2"></span>or\ue603each\ue603stor<span class="blank _0"></span>age\ue603device</span></div><div class="t m0 x1d h1d y137 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ffa ws5">Be able to apply their knowledge in c<span class="blank _0"></span>onte<span class="blank _2"></span>xt within scenarios</span></div><div class="t m0 x1d h16 y138 ff7 fs8 fc0 sc0 ls2 ws5">Not requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d y139 ff10 fs8 fc0 sc0 ls2 ws36">û\ue603<span class="blank"> </span><span class="ffa ws5">Unders<span class="blank _0"></span>tanding of the componen<span class="blank _0"></span>t parts of these types of stor<span class="blank _2"></span>age</span></div><a class="l"><div class="d m4" style="border-style:none;position:absolute;left:33.592900px;bottom:300.616000px;width:50.684000px;height:11.105400px;background-color:rgba(255,255,255,0.000001);"></div></a></div><div class="pi" data-data="{"ctm":[0.000000,-1.000000,1.000000,0.000000,0.000000,595.276000]}"></div></div> <div id="pfa" class="pf w6 h1a" data-page-no="a"><div class="pc pca w6 h1a"><img fetchpriority="low" loading="lazy" class="bi x4 ye7 w7 h1b" alt="" src="https://files.passeidireto.com/db84dfd8-5eec-45e1-8257-c0faba693d5e/bga.png"><div class="t m3 x19 h15 ye8 fff fsa fc3 sc0 ls2">2</div><div class="t m3 x6 h10 ye9 ff7 fs0 fc0 sc0 ls2 ws5">Visit <span class="fc5 ws10">ocr<span class="blank _1"></span>.org.uk/j277<span class="ff8 fc0 ws5"> for our most up-to-da<span class="blank _0"></span>te speci\ue72eca\ue79fon, support and r<span class="blank _0"></span>esources <span class="blank _7"> </span>V<span class="blank _2"></span>ersion 2.3 © OCR 2024<span class="ff7"> </span></span></span></div><div class="t m3 x1a h10 ye9 ff7 fs0 fc0 sc0 ls2 ws5">8 <span class="blank _8"> </span>GCSE (9\u20131) in Computer Science</div><div class="t m0 x1b h1c y13a ff7 fs4 fc3 sc0 ls2 ws5">Sub topic<span class="blank _34"> </span>Guidance</div><div class="t m0 x1b h16 y13b ff7 fs8 fc0 sc0 ls2 ws5">1.2.3 Units</div><div class="t m0 x1b h1d y13c ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">The\ue603units\ue603of\ue603data\ue603s<span class="blank _0"></span>tor<span class="blank _2"></span>age:</span></div><div class="t m0 x1c h13 y13d ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Bit</span></div><div class="t m0 x1c h13 y13e ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Nibble (4 bits)</span></div><div class="t m0 x1c h13 y13f ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ffa">Byte (8 bits)</span></div><div class="t m0 x1c h13 y140 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ff9 ws2b">Kilobyte\ue603(1,000\ue603bytes\ue603or\ue6031\ue603KB)</span></div><div class="t m0 x1c h13 y141 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ff9 ws2b">Megab<span class="blank _0"></span>yte\ue603(1,000\ue603KB)\ue603</span></div><div class="t m0 x1c h13 y142 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ff9 ws2b">Gigab<span class="blank _0"></span>yte\ue603(1,000\ue603MB)\ue603</span></div><div class="t m0 x1c h13 y143 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ff9 ws2b">T<span class="blank _2e"></span>erabyte\ue603(1,000\ue603GB)\ue603</span></div><div class="t m0 x1c h13 y144 ff12 fs8 fc0 sc0 ls2 ws5">o <span class="blank _36"> </span><span class="ff9 ws2b">Pe<span class="blank _0"></span>tabyte\ue603(1,000\ue603TB)\ue603</span></div><div class="t m0 x1b h1d y145 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">How\ue603dat<span class="blank _0"></span>a\ue603needs\ue603to\ue603be\ue603con<span class="blank _0"></span>vert<span class="blank _0"></span>ed\ue603into\ue603a\ue603binary\ue603f<span class="blank _2"></span>ormat\ue603to\ue603be\ue603</span></div><div class="t m0 x1c h13 y146 ffa fs8 fc0 sc0 ls2 ws5">processed by a c<span class="blank _0"></span>omputer</div><div class="t m0 x1b h1d y147 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">Data\ue603c<span class="blank _0"></span>apacity\ue603and\ue603calcula\ue79fon\ue603of\ue603da<span class="blank _0"></span>ta\ue603capacity\ue603r<span class="blank _2"></span>equirements</span></div><div class="t m0 x1d h16 y148 ff7 fs8 fc0 sc0 ls2 ws2f">Requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d y149 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ffa ws5">Why da<span class="blank _0"></span>ta mus<span class="blank _0"></span>t be stor<span class="blank _0"></span>ed in binary forma<span class="blank _0"></span>t</span></div><div class="t m0 x1d h1d y14a ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">F<span class="blank _0"></span>amiliarity\ue603with\ue603data\ue603units\ue603and\ue603moving\ue603be<span class="blank _0"></span>tween\ue603each</span></div><div class="t m0 x1d h1d y14b ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Data\ue603s<span class="blank _2"></span>torage\ue603devices\ue603ha<span class="blank _2"></span>ve\ue603di\ue72ber<span class="blank _0"></span>ent\ue603\ue72ex<span class="blank _2"></span>ed\ue603capaci\ue79fes</span></div><div class="t m0 x1d h1d y14c ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Calculate\ue603r<span class="blank _2"></span>equired\ue603stor<span class="blank _2"></span>age\ue603capacity\ue603for\ue603a\ue603giv<span class="blank _0"></span>en\ue603set\ue603of\ue603\ue72eles</span></div><div class="t m0 x1d h1d y14d ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Calculate\ue603\ue72ele\ue603siz<span class="blank _2"></span>es\ue603of\ue603sound,\ue603images\ue603and\ue603text\ue603\ue72eles</span></div><div class="t m0 x20 h1d y14e ff10 fs8 fc0 sc0 ls2 ws38">§\ue603<span class="blank"> </span><span class="ff9 ws2b">sound\ue603\ue72ele\ue603size\ue603=\ue603sample\ue603r<span class="blank _2"></span>ate\ue603x\ue603dur<span class="blank _0"></span>a\ue79fon\ue603(s)\ue603x\ue603bit\ue603depth\ue603</span></div><div class="t m0 x20 h1d y14f ff10 fs8 fc0 sc0 ls2 ws38">§\ue603<span class="blank"> </span><span class="ff9 ws2b">image\ue603\ue72ele\ue603siz<span class="blank _0"></span>e\ue603=\ue603colour\ue603depth\ue603x\ue603image\ue603heigh<span class="blank _0"></span>t\ue603(p<span class="blank _0"></span>x)\ue603x\ue603image\ue603</span></div><div class="t m0 x21 h13 y150 ffa fs8 fc0 sc0 ls2 ws5">width (px)</div><div class="t m0 x20 h1d y151 ff10 fs8 fc0 sc0 ls2 ws38">§\ue603<span class="blank"> </span><span class="ff9 ws2b">te<span class="blank _0"></span>xt\ue603\ue72ele\ue603size\ue603=\ue603bits\ue603per\ue603char<span class="blank _2"></span>acter\ue603x\ue603number\ue603of\ue603charact<span class="blank _0"></span>ers</span></div><div class="t m0 x1d h16 y152 ff8 fs8 fc0 sc0 ls2 ws2f">Alterna\ue79fv<span class="blank _0"></span>es</div><div class="t m0 x1d h13 y153 ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>Use\ue603of\ue6031,024\ue603for\ue603c<span class="blank _0"></span>onv<span class="blank _0"></span>ersions\ue603and\ue603c<span class="blank _0"></span>alcula\ue79fons\ue603would\ue603be\ue603accept<span class="blank _0"></span>able\ue603</div><div class="t m0 x1d h13 y154 ff9 fs8 fc0 sc0 ls2 ws2e">\u2022\ue603<span class="blank"> </span>Allowance\ue603f<span class="blank _2"></span>or\ue603metadata\ue603in\ue603c<span class="blank _0"></span>alcula\ue79fons\ue603ma<span class="blank _0"></span>y\ue603be\ue603used</div><div class="t m0 x1b h16 y155 ff7 fs8 fc0 sc0 ls2 ws5">1.2.4 Data s<span class="blank _0"></span>tor<span class="blank _2"></span>age</div><div class="t m0 x1b h16 y156 ff7 fs8 fc0 sc0 ls2 ws2f">Numbers</div><div class="t m0 x1b h1d y157 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">How\ue603to\ue603c<span class="blank _0"></span>onv<span class="blank _0"></span>ert\ue603posi\ue79fve\ue603denary\ue603whole\ue603number<span class="blank _0"></span>s\ue603to\ue603binary\ue603number<span class="blank _0"></span>s\ue603</span></div><div class="t m0 x1c h13 y158 ff9 fs8 fc0 sc0 ls2 ws2b">(up\ue603to\ue603and\ue603including\ue6038\ue603bits)\ue603and\ue603vice\ue603ver<span class="blank _0"></span>sa</div><div class="t m0 x1b h1d y159 ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ffa ws5">How to add two binary in<span class="blank _0"></span>teger<span class="blank _2"></span>s together (up to and including </span></div><div class="t m0 x1c h13 y15a ff9 fs8 fc0 sc0 ls2 ws2b">8\ue603bits)\ue603and\ue603explain\ue603ov<span class="blank _0"></span>er\ue747ow\ue603error<span class="blank _2"></span>s\ue603which\ue603may\ue603occur</div><div class="t m0 x1b h1d y15b ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">How\ue603to\ue603con<span class="blank _2"></span>vert\ue603posi\ue79fve\ue603denary\ue603whole\ue603numbers\ue603int<span class="blank _2"></span>o\ue6032-digit\ue603</span></div><div class="t m0 x1c h13 y15c ff9 fs8 fc0 sc0 ls2 ws2b">hex<span class="blank _2"></span>adecimal\ue603numbers\ue603and\ue603vice\ue603versa</div><div class="t m0 x1b h1d y15d ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">How\ue603to\ue603con<span class="blank _2"></span>vert\ue603binary\ue603integer<span class="blank _2"></span>s\ue603to\ue603their\ue603hexadecimal\ue603equiv<span class="blank _2"></span>alents\ue603</span></div><div class="t m0 x1c h13 y15e ff9 fs8 fc0 sc0 ls2 ws2b">and\ue603vice\ue603ver<span class="blank _0"></span>sa</div><div class="t m0 x1b h1d y15f ff10 fs8 fc0 sc0 ls2 ws34">¨\ue603<span class="blank"> </span><span class="ff9 ws2b">Binary\ue603shi\ue74cs</span></div><div class="t m0 x1d h16 y156 ff7 fs8 fc0 sc0 ls2 ws2f">Requir<span class="blank _0"></span>ed</div><div class="t m0 x1d h1d y160 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ffa ws5">Denary number rang<span class="blank _0"></span>e 0 \u2013 255</span></div><div class="t m0 x1d h1d y161 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ffa ws5">Hex<span class="blank _2"></span>adecimal range 00 \u2013 FF</span></div><div class="t m0 x1d h1d y162 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ffa ws5">Binary number rang<span class="blank _0"></span>e 00000000 \u2013 11111111</span></div><div class="t m0 x1d h1d y163 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws39">Unders<span class="blank _0"></span>tanding\ue603of\ue603the\ue603terms\ue603\u2018mos<span class="blank _2"></span>t\ue603signi\ue72ecant\ue603bit<span class="blank"> </span>\u2019<span class="blank _2e"></span>,\ue603and\ue603\u2018least\ue603</span></div><div class="t m0 x1e h13 y164 ff9 fs8 fc0 sc0 ls2 ws3a">signi\ue72ecant\ue603bit\u2019</div><div class="t m0 x1d h1d y165 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Conv<span class="blank _0"></span>ersion\ue603of\ue603an<span class="blank _2"></span>y\ue603number\ue603in\ue603these\ue603ranges\ue603to\ue603another\ue603number\ue603</span></div><div class="t m0 x1e h13 y166 ffa fs8 fc0 sc0 ls2">base</div><div class="t m0 x1d h1d y167 ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ffa ws5">Ability to deal with binary numbers c<span class="blank _0"></span>ontaining be<span class="blank _0"></span>tween 1 and </span></div><div class="t m0 x1e h13 y168 ffa fs8 fc0 sc0 ls2 ws5">8 bits</div><div class="t m0 x20 h1d y169 ff10 fs8 fc0 sc0 ls2 ws38">§\ue603<span class="blank"> </span><span class="ffa ws5">e.g. 11010 is the same as 00011010</span></div><div class="t m0 x1d h1d y16a ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Unders<span class="blank _0"></span>tand\ue603the\ue603e\ue72b<span class="blank _2"></span>ect\ue603of\ue603a\ue603binary\ue603shi\ue74c\ue603(both\ue603le\ue74c\ue603or\ue603right)\ue603on\ue603a\ue603</span></div><div class="t m0 x1e h13 y16b ffa fs8 fc0 sc0 ls2">number</div><div class="t m0 x1d h1d y16c ff10 fs8 fc0 sc0 ls2 ws35">ü\ue603<span class="blank"> </span><span class="ff9 ws2b">Carry\ue603out\ue603a\ue603binary\ue603shi\ue74c\ue603(both\ue603le\ue74c\ue603and\ue603right)</span></div><a class="l"><div class="d m4" style="border-style:none;position:absolute;left:33.592900px;bottom:530.842400px;width:50.683400px;height:11.105400px;background-color:rgba(255,255,255,0.000001);"></div></a></div><div class="pi" data-data="{"ctm":[0.000000,-1.000000,1.000000,0.000000,0.000000,595.276000]}"></div></div>
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