tag:blogger.com,1999:blog-84408379460387365462023-11-15T06:09:04.341-08:00Muito Bom SaberEliza Linshttp://www.blogger.com/profile/06508626987120768891noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8440837946038736546.post-74377708486202140732010-03-10T09:30:00.000-08:002010-03-10T09:44:58.901-08:00MEMORIA ROM E RAM<meta equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><meta name="Generator" content="Microsoft Word 12"><meta name="Originator" content="Microsoft Word 12"><link rel="File-List" href="file:///C:%5CUsers%5CInho%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_filelist.xml"><link rel="themeData" href="file:///C:%5CUsers%5CInho%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_themedata.thmx"><link rel="colorSchemeMapping" href="file:///C:%5CUsers%5CInho%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_colorschememapping.xml"><!--[if gte mso 9]><xml> <w:worddocument> <w:view>Normal</w:View> <w:zoom>0</w:Zoom> 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mso-fareast-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} .MsoPapDefault {mso-style-type:export-only; margin-bottom:10.0pt; line-height:115%;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} </style> <![endif]--> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">No que se refere ao hardware dos computadores, entendemos como memória os dispositivos que armazenam os dados com os quais o processador trabalha. Há, essencialmente, duas categorias de memórias: <b>ROM</b> (<i>Read-Only Memory</i>), que permite apenas a leitura dos dados e não perde informação</span><a href="http://www.infowester.com/memoria.php"><span style="font-size:12pt;"></span></a><span style="font-size:12pt;"> na ausência de energia; e <b>RAM</b> (<i>Random-Access Memory</i>), que permite ao processador tanto a leitura quanto a gravação de dados e perde informação quando não há alimentação elétrica.<span style="color: rgb(255, 255, 102);"> </span><o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><b><span style="font-size:13.5pt;"><span style="color: rgb(255, 255, 102);"><span style="color: rgb(0, 0, 153);">Memória ROM</span> </span><o:p></o:p></span></b></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">As <b>memórias ROM</b> (<i>Read-Only Memory</i> - Memória Somente de Leitura) recebem esse nome porque os dados são gravados nelas apenas uma vez. Depois disso, essas informações</span><a href="http://www.infowester.com/memoria.php"><span style="font-size:12pt;"></span></a><span style="font-size:12pt;"> não podem ser apagadas ou alteradas, apenas lidas pelo computador, exceto por meio de procedimentos especiais. Outra característica das memórias ROM é que elas são do tipo <i>não voláteis</i>, isto é, os dados gravados não são perdidos na ausência de energia elétrica ao dispositivo. Eis os principais tipos de memória ROM:<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>PROM</b> (<i>Programmable Read-Only Memory</i>): esse é um dos primeiros tipos de memória ROM. A gravação de dados neste tipo é realizada por meio de aparelhos que trabalham através de uma reação física com elementos elétricos. Uma vez que isso ocorre, os dados gravados na memória PROM não podem ser apagados ou alterados;<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>EPROM</b> (<i>Erasable Programmable Read-Only Memory</i>): as memórias EPROM têm como principal característica a capacidade de permitir que dados sejam regravados no dispositivo. Isso é feito com o auxílio de um componente que emite luz ultravioleta. Nesse processo, os dados gravados precisam ser apagados por completo. Somente depois disso é que uma nova gravação pode ser feita;<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>EEPROM</b> (<i>Electrically-Erasable Programmable Read-Only Memory</i>): este tipo de memória ROM também permite a regravação de dados, no entanto, ao contrário do que acontece com as memórias EPROM, os processos para apagar e gravar dados são feitos eletricamente, fazendo com que não seja necessário mover o dispositivo de seu lugar para um aparelho especial para que a regravação ocorra;<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>EAROM</b> (<i>Electrically-Alterable Programmable Read-Only Memory</i>): as memórias EAROM podem ser vistas como um tipo de EEPROM. Sua principal característica é o fato de que os dados gravados podem ser alterados aos poucos, razão pela qual esse tipo é geralmente utilizado em aplicações que exigem apenas reescrita parcial de informações;<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>Flash</b>: as memórias Flash também podem ser vistas como um tipo de EEPROM, no entanto, o processo de gravação (e regravação) é muito mais rápido. Além disso, memórias Flash são mais duráveis e podem guardar um volume elevado de dados;<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>CD-ROM</b>, <b>DVD-ROM</b> e afins: essa é uma categoria de discos ópticos onde os dados são gravados apenas uma vez, seja de fábrica, como os CDs de músicas, ou com dados próprios do usuário, quando o próprio efetua a gravação. Há também uma categoria que pode ser comparada ao tipo EEPROM, pois permite a regravação de dados: CD-RW e DVD-RW e afins.<o:p></o:p></span></span></p> <p class="MsoNormal" style="margin-bottom: 0.0001pt; line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;"><o:p> </o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><b><span style="font-size:13.5pt;"><span style="color: rgb(0, 0, 153);">Memória RAM</span><o:p></o:p></span></b></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">As <b>memórias RAM</b> (<i>Random-Access Memory</i> - Memória de Acesso Aleatório) constituem uma das partes mais importantes dos computadores, pois são nelas que o processador armazena os dados com os quais está lidando. Esse tipo de memória tem um processo de gravação de dados extremamente rápido, se comparado aos vários tipos de memória ROM. No entanto, as informações gravadas se perdem quando não há mais energia elétrica, isto é, quando o computador é desligado, sendo, portanto, um tipo de memória <i>volátil</i>.<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">Há dois tipos de tecnologia de memória RAM que são muitos utilizados: estático e dinâmico, isto é, SRAM e DRAM, respectivamente. Há também um tipo mais recente chamado de MRAM. Eis uma breve explicação de cada tipo:<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>SRAM</b> (<i>Static Random-Access Memory</i> - RAM Estática): esse tipo é muito mais rápido que as memórias DRAM, porém armazena menos dados e possui preço elevado se considerarmos o custo por megabyte. Memórias SRAM costumam ser utilizadas como cache</span><span style="font-size:12pt;">;<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>DRAM</b> (<i>Dynamic Random-Access Memory</i> - RAM Dinâmica): memórias desse tipo possuem capacidade alta, isto é, podem comportar grandes quantidades de dados. No entanto, o acesso a essas informações costuma ser mais lento que o acesso às memórias estáticas. Esse tipo também costuma ter preço bem menor quando comparado ao tipo estático;<o:p></o:p></span></span></p> <p class="MsoNormal" style="line-height: normal; color: rgb(0, 0, 153);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="font-size:12pt;">- <b>MRAM</b> (<i>Magnetoresistive Random-Access Memory</i> - RAM Magneto-resistiva): a memória MRAM vem sendo estudada há tempos, mas somente nos últimos anos é que as primeiras unidades surgiram. Trata-se de um tipo de memória até certo ponto semelhante à DRAM, mas que utiliza células magnéticas. Graças a isso, essas memórias consomem menor quantidade de energia, são mais rápidas e armazenam dados por um longo tempo, mesmo na ausência de energia elétrica. O problema das memórias MRAM é que elas armazenam pouca quantidade de dados e são muito caras, portanto, pouco provavelmente serão adotadas em larga escala.</span></span></p><p class="MsoNormal" style="line-height: normal;">
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margin-bottom:10.0pt; line-height:115%;} @page Section1 {size:595.3pt 841.9pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:35.4pt; mso-footer-margin:35.4pt; mso-paper-source:0;} div.Section1 {page:Section1;} /* List Definitions */ @list l0 {mso-list-id:512035769; mso-list-template-ids:-867283898;} @list l0:level1 {mso-level-number-format:bullet; mso-level-text:; mso-level-tab-stop:36.0pt; mso-level-number-position:left; text-indent:-18.0pt; mso-ansi-font-size:10.0pt; font-family:Symbol;} ol {margin-bottom:0cm;} ul {margin-bottom:0cm;} --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} </style> <![endif]--> <p style="color: rgb(0, 51, 0);font-family:trebuchet ms;" class="MsoNormal"><span style="font-size:85%;">De tanto surgir novidades no mercado da tecnologia, novos aparelhos, novas marcas, nomes diferentes, acredito que o nome smartphone deixou muita gente em dúvida do que seria, em primeiro lugar a palavra<span style=""> </span>smartphone não é uma marca e sim um aparelho telefônico que surgiu para revolucionar os telefones móvel .<o:p></o:p></span></p> <p style="color: rgb(0, 51, 0);font-family:trebuchet ms;" class="MsoNormal"><span style="font-size:85%;">De acordo o a<span style=""> </span>definição contida na Wikipédia<span style="font-weight: bold;"> Smartphone </span>é um aparelho com funcionalidades avançadas que podem ser estendidas por meio de programas executados no seu Sistema Operacional. <span style=""> </span>É um aparelho <strong>celular </strong>que engloba muitas das principais tecnologias de comunicação e serviços que temos num computador ou em outros dispositivos, como acesso à E-mails, mensagens instantâneas (como o MSN), internet, GPS, entre outros. Os <strong>Smartphones </strong>possuem diversos meios de se comunicar com outros dispositivos através de <strong>Bluetooth</strong>, <strong>infravermelho </strong>e internet, com a finalidade de transferir arquivos de vídeo, fotos, música, planílhas, ou até mesmo sincronizar informações com outros programas no computador ou em outros<span style="font-weight: bold;"> </span><strong style="font-weight: normal;">Smartphones</strong>.</span></p> <p style="color: rgb(0, 51, 0);font-family:trebuchet ms;" class="MsoNormal"><span style="font-size:85%;">Os Sistemas Operacionais dos Smartphones são "abertos" (não confundir com código-fonte aberto), o que significa que é possível que qualquer pessoa desenvolva programas que podem funcionar nesses telefones.</span></p> <p style="font-weight: bold; color: rgb(0, 153, 0);font-family:trebuchet ms;" class="MsoNormal"><span style="font-size:85%;"><span style="font-size:100%;">O PRINCIPAIS FABRICANTES</span></span></p><ul style="color: rgb(0, 51, 0);font-family:trebuchet ms;"><li><span style="font-size:85%;"><span style="font-size:100%;">Appel</span></span></li><li><span style="font-size:85%;"><span style="font-size:100%;">Acer</span></span></li><li><span style="font-size:85%;"><span style="font-size:100%;">HP</span></span></li><li><span style="font-size:85%;"><span style="font-size:100%;">Samsung</span></span></li><li><span style="font-size:85%;"><span style="font-size:100%;">Motorola</span></span></li><li><span style="font-size:85%;"><span style="font-size:100%;">Nokia</span></span></li><li><span style="font-size:85%;"><span style="font-size:100%;">Sony</span></span></li></ul><span style="color: rgb(0, 51, 0);font-size:85%;" ><a href="http://pt.wikipedia.org/wiki/Acer_%28empresa%29" title="Acer (empresa)"><span style="font-size:12pt;"></span></a><span style="font-size:12pt;"><o:p></o:p></span></span><span style="color: rgb(0, 51, 0);font-size:85%;" ><a href="http://pt.wikipedia.org/wiki/Samsung_Electronics" title="Samsung Electronics"><span style="font-size:12pt;"></span></a><span style="font-size:12pt;"><o:p></o:p></span></span><span style="color: rgb(0, 51, 0);font-size:85%;" ><a href="http://pt.wikipedia.org/wiki/Motorola" title="Motorola"><span style="font-size:12pt;"></span></a><span style="font-size:12pt;"><o:p></o:p></span></span><span style="color: rgb(0, 51, 0);font-size:85%;" ><a href="http://pt.wikipedia.org/wiki/Sony" title="Sony"><span style="font-size:12pt;"></span></a><span style="font-size:12pt;"><o:p></o:p></span></span> <h3 style="font-weight: normal; color: rgb(0, 102, 0);font-family:trebuchet ms;">
<br /><span style="font-size:85%;"><span style="text-decoration: underline;"></span></span></h3><h3 style="font-weight: normal; color: rgb(0, 102, 0);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="text-decoration: underline;"></span><span style="font-weight: bold; color: rgb(0, 153, 0);font-size:100%;" >Quais são os melhores smartphones?</span></span></h3> <p style="color: rgb(0, 51, 0);font-family:trebuchet ms;"><span style="font-size:85%;">Um dos mais conhecidos smartphones, e até pode-se dizer o criador do conceito, é o iPhone, criado pela Apple. Mas o iPhone, em suas versões iniciais, tinha poucos adicionais: motivou até uma campanha difamatória na web, que o comparava a um chuchu.</span></p> <p style="color: rgb(204, 255, 255);font-family:trebuchet ms;"><span style="font-size:85%;"><span style="color: rgb(0, 51, 0);">Recentemente, novos smartphones chegaram ao mercado e se estabeleceram com grande presença no mercado nacional. O BlackBerry Nokia 9000, da empresa finlandesa muito forte no Brasil, hoje disputa mercado na liderança, contra os modelos de outras empresas, como Motorola e Sony Erics</span>son.</span></p> Eliza Linshttp://www.blogger.com/profile/06508626987120768891noreply@blogger.com0