Introduzione_DOS.zip

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an introduction to DOS
Introduzione_DOS.zip
  • Introduzione al DOS.doc
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内容介绍
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/622babb515da9b288b5b537a/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <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://static.pudn.com/prod/directory_preview_static/622babb515da9b288b5b537a/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0"> Introduzione al DOS</div><div class="t m0 x1 h4 y3 ff2 fs1 fc0 sc0 ls0 ws0">Il <span class="ff1">DOS<span class="_ _0"></span> </span>(Disk Operating<span class="_ _0"></span> System) &#232;<span class="_ _0"></span> il sistema <span class="_ _0"></span>operativo usato <span class="_ _0"></span>da almeno <span class="_ _0"></span>70 milioni</div><div class="t m0 x1 h4 y4 ff2 fs1 fc0 sc0 ls0 ws0">di <span class="_ _0"></span>utilizzatori<span class="_ _0"></span> d<span class="_ _0"></span>i <span class="_ _0"></span>personal <span class="_ _0"></span>computer <span class="_ _0"></span>IBM<span class="_ _0"></span> <span class="_ _0"></span>ed <span class="_ _0"></span>IBM<span class="_ _0"></span> co<span class="_ _0"></span>mpatibili. <span class="_ _0"></span>Il<span class="_ _0"></span> DOS<span class="_ _0"></span> <span class="_ _0"></span>&#232;<span class="_ _0"></span> stato<span class="_ _0"></span> <span class="_ _0"></span>messo</div><div class="t m0 x1 h4 y5 ff2 fs1 fc0 sc0 ls0 ws0">a <span class="_ _1"></span>punto <span class="_ _0"></span>dalla<span class="_ _1"></span> <span class="_ _0"></span><span class="ff1">Microsoft <span class="_ _1"></span>Corporation</span>.<span class="_ _0"></span> <span class="_ _0"></span>Il<span class="_ _0"></span> <span class="_ _0"></span>realt&#224;<span class="_ _0"></span> <span class="_ _0"></span>il<span class="_ _0"></span> <span class="_ _0"></span>DOS<span class="_ _0"></span> <span class="_ _0"></span>&#232;<span class="_ _0"></span> <span class="_ _0"></span>costituito<span class="_ _0"></span> <span class="_ _0"></span>di<span class="_ _0"></span> <span class="_ _0"></span>varie<span class="_ _0"></span> <span class="_ _0"></span>parti.<span class="_ _0"></span> <span class="_ _0"></span>Il</div><div class="t m0 x1 h4 y6 ff2 fs1 fc0 sc0 ls0 ws0">sistema<span class="_ _0"></span> <span class="_ _1"></span>stesso<span class="_ _0"></span> <span class="_ _1"></span>&#232;<span class="_ _1"></span> <span class="_ _0"></span>composto<span class="_ _1"></span> <span class="_ _0"></span>da<span class="_ _1"></span> <span class="_ _0"></span>q<span class="_ _0"></span>uattro<span class="_ _0"></span> <span class="_ _1"></span>file<span class="_ _0"></span> <span class="_ _1"></span>principali<span class="_ _1"></span> <span class="_ _0"></span>e<span class="_ _1"></span> <span class="_ _0"></span>di<span class="_ _1"></span> <span class="_ _1"></span>tanti<span class="_ _0"></span> <span class="_ _1"></span>piccoli<span class="_ _0"></span> <span class="_ _1"></span>programmi,</div><div class="t m0 x1 h4 y7 ff2 fs1 fc0 sc0 ls0 ws0">ognuno<span class="_ _2"></span> <span class="_ _2"></span>dei<span class="_ _2"></span> <span class="_ _2"></span>quali<span class="_ _2"> </span> <span class="_ _3"> </span>sovrintende<span class="_ _2"></span> <span class="_ _2"></span>ad<span class="_ _2"></span> <span class="_ _2"></span>una<span class="_ _2"></span> <span class="_ _2"> </span>d<span class="_ _0"></span>eterminata<span class="_ _2"></span> <span class="_ _2"></span>funzione<span class="_ _2"></span> <span class="_ _2"> </span>non<span class="_ _2"> </span> <span class="_ _3"> </span>appena<span class="_ _2"></span> <span class="_ _2"></span>viene</div><div class="t m0 x1 h4 y8 ff2 fs1 fc0 sc0 ls0 ws0">chiamato ad eseguirla dal comando digitat<span class="_ _4"></span>o dall&#8217;utente. </div><div class="t m0 x1 h4 y9 ff2 fs1 fc0 sc0 ls0 ws0">La<span class="_ _0"></span> <span class="_ _1"></span>prima<span class="_ _1"></span> <span class="_ _0"></span>parte<span class="_ _1"></span> <span class="_ _1"></span>del<span class="_ _0"></span> <span class="_ _1"></span>DOS<span class="_ _1"></span> <span class="_ _0"></span>&#232;<span class="_ _1"></span> <span class="_ _1"></span>il<span class="_ _1"></span> <span class="_ _0"></span>&#8220;Basic<span class="_ _1"></span> <span class="_ _1"></span>Input/Output<span class="_ _0"></span> <span class="_ _1"></span>System&#8221;,<span class="_ _1"></span> <span class="_ _1"></span>il<span class="_ _2"></span> <span class="_ _0"></span><span class="ff1">BIOS</span>.<span class="_ _1"></span> <span class="_ _1"></span>Questa<span class="_ _0"></span> <span class="_ _1"></span>parte</div><div class="t m0 x1 h4 ya ff2 fs1 fc0 sc0 ls0 ws0">contiene<span class="_ _2"></span> <span class="_ _2"></span>tutte<span class="_ _1"></span> <span class="_ _3"> </span>le<span class="_ _2"></span> <span class="_ _2"></span>funzi<span class="_ _4"></span>oni<span class="_ _2"></span> <span class="_ _2"></span>necessarie<span class="_ _2"></span> <span class="_ _2"></span>a<span class="_ _1"></span> <span class="_ _2"> </span>co<span class="_ _0"></span>municare<span class="_ _2"></span> <span class="_ _2"></span>con<span class="_ _2"></span> <span class="_ _2"></span>l<span class="_ _4"></span>e<span class="_ _2"></span> <span class="_ _2"></span>periferiche:<span class="_ _2"></span> <span class="_ _2"></span>tasti<span class="_ _4"></span>era,</div><div class="t m0 x1 h4 yb ff2 fs1 fc0 sc0 ls0 ws0">monitor,<span class="_ _2"></span> <span class="_ _2"></span>drive,<span class="_ _2"></span> <span class="_ _2"></span>dischi<span class="_ _2"></span> <span class="_ _2"></span>ri<span class="_ _4"></span>gidi.<span class="_ _2"></span> <span class="_ _2"></span>Tutte<span class="_ _2"></span> <span class="_ _2"></span>le<span class="_ _2"></span> <span class="_ _2"></span>richieste<span class="_ _2"></span> <span class="_ _2"></span>di<span class="_ _2"></span> <span class="_ _2"></span>lavoro<span class="_ _2"></span> <span class="_ _2"></span>effettu<span class="_ _4"></span>ate<span class="_ _2"></span> <span class="_ _2"></span>verso<span class="_ _2"></span> <span class="_ _2"></span>queste</div><div class="t m0 x1 h4 yc ff2 fs1 fc0 sc0 ls0 ws0">periferiche,<span class="_"> </span> <span class="_"> </span>avvengono<span class="_"> </span> <span class="_"> </span>tramite<span class="_"> </span> <span class="_"> </span>il<span class="_"> </span> <span class="_"> </span>BIOS.<span class="_"> </span> <span class="_"> </span>Altre<span class="_"> </span> <span class="_"> </span>eventuali<span class="_"> </span> <span class="_"> </span>periferiche,<span class="_"> </span> <span class="_"> </span>come</div><div class="t m0 x1 h4 yd ff2 fs1 fc0 sc0 ls0 ws0">stampanti, mouse <span class="_ _0"></span>o lettori di <span class="_ _0"></span>CD, che <span class="_ _0"></span>non sono <span class="_ _0"></span>previste dal <span class="_ _0"></span>BIOS, hanno b<span class="_ _0"></span>isogno</div><div class="t m0 x1 h4 ye ff2 fs1 fc0 sc0 ls0 ws0">di un file di supporto, chiamato &#8220;driver&#8221;, che <span class="_ _0"></span>ne permetta l&#8217;utilizzo. Nell&#8217;aggiungere</div><div class="t m0 x1 h4 yf ff2 fs1 fc0 sc0 ls0 ws0">una periferica di questi tip<span class="_ _0"></span>i &#232; necessario <span class="_ _0"></span>fare attenzione all&#8217;installazione del giusto</div><div class="t m0 x1 h4 y10 ff2 fs1 fc0 sc0 ls0 ws0">driver,<span class="_ _1"></span> <span class="_ _2"></span>altrimenti<span class="_ _1"></span> <span class="_ _2"></span>res<span class="_ _4"></span>terebbe<span class="_ _1"></span> <span class="_ _2"></span>inutilizzabile.<span class="_ _1"></span> <span class="_ _2"></span>Il<span class="_ _1"></span> <span class="_ _1"></span>BIOS<span class="_ _2"></span> <span class="_ _1"></span>&#232;<span class="_ _2"></span> <span class="_ _1"></span>suddiviso<span class="_ _1"></span> <span class="_ _2"></span>in<span class="_ _1"></span> <span class="_ _2"></span>due<span class="_ _1"></span> <span class="_ _1"></span>p<span class="_ _0"></span>arti.<span class="_ _1"></span> <span class="_ _2"></span>Una</div><div class="t m0 x1 h4 y11 ff2 fs1 fc0 sc0 ls0 ws0">prima,<span class="_ _2"></span> <span class="_ _2"></span>piccola<span class="_ _2"></span> <span class="_ _2"></span>all&#8217;essenziale,<span class="_ _2"></span> <span class="_ _2"></span>&#232;<span class="_ _2"> </span> <span class="_ _2"> </span>presente<span class="_ _2"></span> <span class="_ _2"> </span>in<span class="_ _2"> </span> <span class="_ _2"> </span>u<span class="_ _0"></span>na<span class="_ _2"></span> <span class="_ _2"></span>ROM<span class="_ _2"></span> <span class="_ _2"></span>sulla<span class="_ _2"></span> <span class="_ _2"></span>scheda<span class="_ _2"> </span> <span class="_ _2"> </span>madre<span class="_ _2"> </span> <span class="_ _3"> </span>del</div><div class="t m0 x1 h4 y12 ff2 fs1 fc0 sc0 ls0 ws0">computer,<span class="_ _0"></span> <span class="_ _0"></span>la<span class="_ _1"></span> <span class="_ _0"></span>seconda<span class="_ _1"></span> <span class="_ _0"></span>in<span class="_ _0"></span> <span class="_ _1"></span>un<span class="_ _0"></span> <span class="_ _1"></span>file<span class="_ _0"></span> <span class="_ _0"></span>invisibile<span class="_ _1"></span> <span class="_ _0"></span>chia<span class="_ _0"></span>mato<span class="_ _0"></span> <span class="_ _0"></span>IBMBIO.COM<span class="_ _1"></span> <span class="_ _0"></span>oppure<span class="_ _1"></span> <span class="_ _0"></span>IO.SYS</div><div class="t m0 x1 h4 y13 ff2 fs1 fc0 sc0 ls0 ws0">e registrato su disco. </div><div class="t m0 x1 h4 y14 ff2 fs1 fc0 sc0 ls0 ws0">La<span class="_ _0"></span> <span class="_ _0"></span>se<span class="_ _0"></span>conda<span class="_ _0"></span> <span class="_ _0"></span>pa<span class="_ _0"></span>rte<span class="_ _0"></span> <span class="_ _0"></span>de<span class="_ _0"></span>l<span class="_ _0"></span> <span class="_ _1"></span>DOS<span class="_ _0"></span> <span class="_ _1"></span>&#232;<span class="_ _0"></span> <span class="_ _1"></span>costituita<span class="_ _0"></span> <span class="_ _1"></span>dal<span class="_ _0"></span> <span class="_ _1"></span>kernel.<span class="_ _0"></span> <span class="_ _1"></span>Il<span class="_ _2"></span> <span class="ff1">k<span class="_ _0"></span>ernel</span> <span class="_ _2"></span>sovrinten<span class="_ _4"></span>de<span class="_ _0"></span> <span class="_ _1"></span>a<span class="_ _0"></span> <span class="_ _1"></span>tutto<span class="_ _0"></span> <span class="_ _1"></span>il</div><div class="t m0 x1 h4 y15 ff2 fs1 fc0 sc0 ls0 ws0">funzionamento<span class="_ _2"></span> <span class="_ _2"></span>del<span class="_ _2"></span> <span class="_ _2"></span>computer,<span class="_ _2"></span> <span class="_ _2"></span>ricev<span class="_ _4"></span>endo<span class="_ _2"></span> <span class="_ _2"></span>le<span class="_ _2"></span> <span class="_ _2"></span>richieste<span class="_ _2"></span> <span class="_ _2"></span>di<span class="_ _2"></span> <span class="_ _2"></span>lavoro<span class="_ _2"></span> <span class="_ _1"></span>d<span class="_ _0"></span>ai<span class="_ _2"></span> <span class="_ _2"></span>programmi<span class="_ _2"></span> <span class="_ _2"></span>e</div><div class="t m0 x1 h4 y16 ff2 fs1 fc0 sc0 ls0 ws0">convogliandole al BIOS. Il kernel &#232; registrato su disco in u<span class="_ _0"></span>n file invisibile chiamato</div><div class="t m0 x1 h4 y17 ff2 fs1 fc0 sc0 ls0 ws0">IBMDOS.COM oppure MSDOS.COM. </div><div class="t m0 x1 h4 y18 ff2 fs1 fc0 sc0 ls0 ws0">La <span class="_ _0"></span>terza <span class="_ _0"></span>parte <span class="_ _0"></span>principale <span class="_ _0"></span>del<span class="_ _0"></span> <span class="_ _0"></span>DOS <span class="_ _0"></span>&#232; <span class="_ _0"></span>l&#8217;interprete <span class="_ _0"></span>dei <span class="_ _0"></span>comandi,<span class="_ _0"></span> rappresentata<span class="_ _0"></span> d<span class="_ _0"></span>a <span class="_ _0"></span>un</div><div class="t m0 x1 h4 y19 ff2 fs1 fc0 sc0 ls0 ws0">file<span class="_ _2"></span> <span class="_ _2"> </span>chiamato<span class="_ _5"> </span> <span class="ff1">COMMAND.COM</span>,<span class="_ _2"> </span> <span class="_ _3"> </span>e<span class="_ _2"></span> <span class="_ _3"> </span>che<span class="_ _2"></span> <span class="_ _2"> </span>&#232;<span class="_ _2"> </span> <span class="_ _3"> </span>l&#8217;unica<span class="_ _2"> </span> <span class="_ _3"> </span>parte<span class="_ _2"></span> <span class="_ _2"> </span>visibile<span class="_ _2"> </span> <span class="_ _3"> </span>su<span class="_ _2"> </span> <span class="_ _3"> </span>schermo<span class="_ _2"></span> <span class="_ _2"> </span>de<span class="_ _0"></span>l</div><div class="t m0 x1 h4 y1a ff2 fs1 fc0 sc0 ls0 ws0">DOS.<span class="_ _2"></span> <span class="_ _2"></span>L&#8217;interprete<span class="_ _1"></span> <span class="_ _2"></span>si<span class="_ _2"></span> <span class="_ _2"></span>incarica<span class="_ _2"></span> <span class="_ _2"></span>di<span class="_ _2"></span> <span class="_ _1"></span>ricevere<span class="_ _2"></span> <span class="_ _2"></span>i<span class="_ _2"></span> <span class="_ _2"></span>comandi<span class="_ _2"></span> <span class="_ _1"></span>digitati<span class="_ _2"></span> <span class="_ _2"></span>dall&#8217;utilizzatore<span class="_ _2"></span> <span class="_ _2"></span>sulla</div><div class="t m0 x1 h4 y1b ff2 fs1 fc0 sc0 ls0 ws0">tastiera e di inoltrarli al kernel. Fra i suoi compiti rientr<span class="_ _4"></span>ano anche: </div><div class="t m0 x2 h4 y1c ff3 fs1 fc0 sc0 ls0 ws0">-<span class="_ _6"> </span><span class="ff2">mostrare<span class="_ _2"></span> <span class="_ _2"></span>i<span class="_ _1"></span> <span class="_ _2"></span>messaggi<span class="_ _2"></span> <span class="_ _2"></span>di<span class="_ _2"></span> <span class="_ _2"></span>errore<span class="_ _2"></span> <span class="_ _1"></span>in<span class="_ _2"></span> <span class="_ _2"></span>caso<span class="_ _2"></span> <span class="_ _2"></span>di<span class="_ _2"></span> <span class="_ _1"></span>inesattezze<span class="_ _2"></span> <span class="_ _2"></span>nella<span class="_ _2"></span> <span class="_ _2"></span>sintassi<span class="_ _1"></span> <span class="_ _2"></span>del</span></div><div class="t m0 x3 h4 y1d ff2 fs1 fc0 sc0 ls0 ws0">comando o di difficolt&#224; incontrata nell&#8217;eseguir<span class="_ _4"></span>lo </div><div class="t m0 x2 h4 y1e ff3 fs1 fc0 sc0 ls0 ws0">-<span class="_ _6"> </span><span class="ff2">notificare<span class="_ _1"></span> <span class="_ _2"></span>all&#8217;utilizzatore<span class="_ _1"></span> <span class="_ _2"></span>l&#8217;andamento<span class="_ _1"></span> <span class="_ _2"></span>e<span class="_ _1"></span> <span class="_ _2"></span>le<span class="_ _0"></span> <span class="_ _2"></span>conseguenze<span class="_ _1"></span> <span class="_ _2"></span>di<span class="_ _1"></span> <span class="_ _2"></span>un<span class="_ _1"></span> <span class="_ _2"></span>comando,</span></div><div class="t m0 x3 h4 y1f ff2 fs1 fc0 sc0 ls0 ws0">come il risultato positivo di un comando;</div><div class="t m0 x2 h4 y20 ff3 fs1 fc0 sc0 ls0 ws0">-<span class="_ _6"> </span><span class="ff2">gestire<span class="_ _2"></span> <span class="_ _3"> </span>ogni<span class="_ _2"></span> <span class="_ _2"> </span>d<span class="_ _0"></span>ialogo<span class="_ _2"></span> <span class="_ _3"> </span>che<span class="_ _2"></span> <span class="_ _3"> </span>serva<span class="_ _2"></span> <span class="_ _3"> </span>alla<span class="_ _2"></span> <span class="_ _3"> </span>esecuzione<span class="_ _2"></span> <span class="_ _3"> </span>dei<span class="_ _2"></span> <span class="_ _3"> </span>comandi,<span class="_ _2"></span> <span class="_ _3"> </span>come<span class="_ _2"></span> <span class="_ _2"> </span>la</span></div><div class="t m0 x3 h4 y21 ff2 fs1 fc0 sc0 ls0 ws0">richiesta se un particolare comando debba <span class="_ _4"></span>essere proseguito o meno. </div><div class="t m0 x1 h4 y22 ff2 fs1 fc0 sc0 ls0 ws0">Nel file COMMAND.COM sono compresi tutti i comandi pi&#249; usati del DO<span class="_ _4"></span>S. </div><div class="t m0 x1 h4 y23 ff2 fs1 fc0 sc0 ls0 ws0">La <span class="_ _0"></span>quarta<span class="_ _0"></span> <span class="_ _0"></span>parte<span class="_ _0"></span> <span class="_ _0"></span>del <span class="_ _1"></span>DOS <span class="_ _0"></span>determina<span class="_ _0"></span> <span class="_ _0"></span>alcuni<span class="_ _0"></span> <span class="_ _0"></span>parametri <span class="_ _0"></span>dell&#8217;ambiente<span class="_ _0"></span> <span class="_ _0"></span>di<span class="_ _0"></span> <span class="_ _0"></span>lavoro,<span class="_ _0"></span> <span class="_ _0"></span>cio&#232;</div><div class="t m0 x1 h4 y24 ff2 fs1 fc0 sc0 ls0 ws0">la<span class="_ _2"></span> <span class="_ _2"></span>configurazione<span class="_ _2"></span> <span class="_ _1"></span>del<span class="_ _2"></span> <span class="_ _2"></span>sistema.<span class="_ _2"></span> <span class="_ _2"></span>Nel<span class="_ _2"></span> <span class="_ _2"></span>file,<span class="_ _2"></span> <span class="_ _2"></span>chiamato<span class="_ _1"></span> <span class="_ _2"> </span>CONFIG.SYS,<span class="_ _2"></span> <span class="_ _2"></span>sono<span class="_ _2"></span> <span class="_ _2"></span>registrati</div><div class="t m0 x1 h4 y25 ff2 fs1 fc0 sc0 ls0 ws0">dati come la nazionalizzazione, il tipo e la quan<span class="_ _4"></span>tit&#224; di drive, il numero di buffer e di</div><div class="t m0 x1 h4 y26 ff2 fs1 fc0 sc0 ls0 ws0">file,<span class="_ _1"></span> <span class="_ _2"></span>gli<span class="_ _1"></span> <span class="_ _2"></span>estremi<span class="_ _1"></span> <span class="_ _1"></span>degli<span class="_ _2"></span> <span class="_ _1"></span>altri<span class="_ _2"></span> <span class="_ _1"></span>file<span class="_ _2"></span> <span class="_ _0"></span>d<span class="_ _0"></span>el<span class="_ _1"></span> <span class="_ _2"></span>DOS.<span class="_ _1"></span> <span class="_ _1"></span>I<span class="_ _0"></span>n<span class="_ _1"></span> <span class="_ _2"></span>pratica<span class="_ _1"></span> <span class="_ _2"></span>il<span class="_ _1"></span> <span class="_ _2"></span>DO<span class="_ _4"></span>S<span class="_ _2"></span> <span class="_ _1"></span>pu&#242;<span class="_ _1"></span> <span class="_ _2"></span>funzionare<span class="_ _1"></span> <span class="_ _1"></span>a<span class="_ _0"></span>nche</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div> </body> </html>
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