{"id":1438,"date":"2014-12-27T21:44:13","date_gmt":"2014-12-27T21:44:13","guid":{"rendered":"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=1438"},"modified":"2022-08-07T08:14:19","modified_gmt":"2022-08-07T08:14:19","slug":"national-semiconductor-nsc-4640","status":"publish","type":"post","link":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=1438","title":{"rendered":"NATIONAL SEMICONDUCTOR NSC 4640"},"content":{"rendered":"<p><a href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/12\/4640.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1422 size-full\" src=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/12\/4640.jpg\" alt=\"4640\" width=\"452\" height=\"842\" srcset=\"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/12\/4640.jpg 452w, https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/12\/4640-161x300.jpg 161w\" sizes=\"auto, (max-width: 452px) 100vw, 452px\" \/><\/a><\/p>\n<p>Une impressionnante calculatrice scientifique \u00e0 chiffres rouges.<\/p>\n<p>Les digits ne sont pas constitu\u00e9s de segments continus mais de lignes de points, proc\u00e9d\u00e9 peut-\u00eatre plus \u00e9conomique en \u00e9nergie que des lignes continues.<\/p>\n<p>Quand fut-elle produite ? Son air gentiment archa\u00efque sugg\u00e9rerait l&rsquo;ann\u00e9e 1975 ou 1976.<\/p>\n<p>La logique de calcul, \u00e0 la diff\u00e9rence de la <em><a title=\"NATIONAL SEMICONDUCTOR 4650\" href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=704\">4650<\/a><\/em>, est la notation polonaise inverse, donc sans touche <i>\u00c9GAL<\/i>.<\/p>\n<p>Connait-on aujourd&rsquo;hui l&rsquo;utilisateur de ce type de calculatrice ?<\/p>\n<p>J&rsquo;ai la chance de disposer du manuel, non pas de la 4640 mais de la 4615, une cousine\u00a0programmable de la 4640. Tout \u00e0 la fin du manuel on peut trouver un petit questionnaire consciencieusement rempli par le propri\u00e9taire initial. On peut y\u00a0lire son \u00e2ge, sa profession, la date de l&rsquo;achat, ses motivations etc.<\/p>\n<p>Pour tenter de r\u00e9pondre \u00e0 la question ci-dessus, voici la synth\u00e8se du questionnaire : La machine avait \u00e9t\u00e9 achet\u00e9e le 6 octobre\u00a01977 pour un usage professionnel, \u00e0 l&rsquo;usine (<em>factory<\/em> dans le texte) de <em>Sunnyvale<\/em> en Californie, par un homme \u00e2g\u00e9 de 35\/49 ans. Son domaine d&rsquo;activit\u00e9 \u00e9tait l\u2019ing\u00e9nierie ou le domaine scientifique. A\u00a0la question \u00ab\u00a0<em>qu&rsquo;est-ce-qui vous a particuli\u00e8rement attir\u00e9 dans ce mod\u00e8le<\/em>\u00ab\u00a0, le monsieur a coch\u00e9 \u00ab\u00a0<em>features and capabilities<\/em>\u00a0\u00bb mais aussi \u00ab\u00a0<em>Price<\/em>\u00ab\u00a0.<\/p>\n<p>Ce dernier point \u00e9claire \u00e0 sa fa\u00e7on le positionnement de l&rsquo;offre <em>NSC<\/em>\u00a0dans le march\u00e9 de l&rsquo;\u00e9poque : des machines financi\u00e8rement abordables.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une impressionnante calculatrice scientifique \u00e0 chiffres rouges. Les digits ne sont pas constitu\u00e9s de segments continus mais de lignes de points, proc\u00e9d\u00e9 peut-\u00eatre plus \u00e9conomique en \u00e9nergie que des lignes continues. Quand fut-elle produite ? Son air gentiment archa\u00efque sugg\u00e9rerait l&rsquo;ann\u00e9e 1975 ou 1976. La logique de calcul, \u00e0 la diff\u00e9rence de la 4650, est la notation polonaise inverse, donc<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,33],"tags":[],"class_list":["post-1438","post","type-post","status-publish","format-standard","hentry","category-machines-antiques","category-nsc-novus"],"_links":{"self":[{"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/1438","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1438"}],"version-history":[{"count":9,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/1438\/revisions"}],"predecessor-version":[{"id":5488,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/1438\/revisions\/5488"}],"wp:attachment":[{"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1438"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1438"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1438"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}