{"id":1121,"date":"2014-12-01T18:50:07","date_gmt":"2014-12-01T18:50:07","guid":{"rendered":"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=1121"},"modified":"2025-10-30T23:23:12","modified_gmt":"2025-10-30T23:23:12","slug":"hewlett-packard-hp-28s","status":"publish","type":"post","link":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=1121","title":{"rendered":"HEWLETT-PACKARD HP-28S"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-3575 size-full\" src=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2017\/09\/HP_28S-4.jpg\" alt=\"\" width=\"901\" height=\"704\" srcset=\"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2017\/09\/HP_28S-4.jpg 901w, https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2017\/09\/HP_28S-4-300x234.jpg 300w, https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2017\/09\/HP_28S-4-768x600.jpg 768w\" sizes=\"auto, (max-width: 901px) 100vw, 901px\" \/><\/p>\n<p style=\"text-align: justify;\">Il y eut une mode des calculatrices \u00e0 double clavier \u00e0 la fin des ann\u00e9es 80.<\/p>\n<p style=\"text-align: justify;\">Les <em>HP-28C<\/em> et <em>S<\/em>, ainsi que les financi\u00e8res <em>HP-18C<\/em>, <em>19B<\/em>, <em>19BII<\/em> en furent les repr\u00e9sentantes chez <em>Hewlett-Packard<\/em>. <em>Sharp<\/em> de son c\u00f4t\u00e9 sortit les <em>EL-5200<\/em> et <em><a title=\"SHARP EL-9000\" href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=1113\">EL-9000<\/a><\/em>. Il y eut aussi <em>Canon<\/em> et s\u00fbrement quelques autres.<\/p>\n<p style=\"text-align: justify;\">La <em>HP-28S<\/em> \u00e9tait innovante, puissante et ch\u00e8re. Elle introduisait la notion d&rsquo;objet : programmes, cha\u00eenes de caract\u00e8res, expressions alg\u00e9briques, unit\u00e9s, valeurs binaires etc. sont d&rsquo;objets pouvant \u00eatre identifi\u00e9s \u00e0 l&rsquo;aide de d\u00e9limiteurs sp\u00e9cifiques, manipul\u00e9s et m\u00e9moris\u00e9s comme tels.<\/p>\n<p style=\"text-align: justify;\">Le langage de programmation \u00e9tait le tout nouveau <em>RPL<\/em>, repris plus tard sur les <a title=\"HEWLETT-PACKARD HP-48G\" href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=1148\"><em>48<\/em><\/a>, <a title=\"HEWLETT-PACKARD HP-49G\" href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=1250\">49<\/a> et\u00a0<em><a title=\"HEWLETT-PACKARD HP-50g\" href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=1212\">50G<\/a><\/em>.<\/p>\n<p style=\"text-align: justify;\">La <em>HP-28S<\/em>\u00a0fut aussi la toute premi\u00e8re calculatrice graphique de <em>HP<\/em>. Plus exactement cette toute premi\u00e8re version s&rsquo;appelait <em>HP-28C.<\/em><\/p>\n<p style=\"text-align: justify;\">La <em>28S<\/em> a deux grands d\u00e9fauts : elle n&rsquo;est connectable \u00e0 aucun p\u00e9riph\u00e9rique de sauvegarde. Heureusement sa m\u00e9moire est vaste : 32 Ko. Second d\u00e9faut, d&rsquo;ordre mat\u00e9riel: les trois piles de type <em>LR1<\/em> appuient tr\u00e8s fort sur la trappe, de sorte qu&rsquo;un jour, celle-ci se fragilise. Ce probl\u00e8me est commun \u00e0 presque toutes les <em>HP<\/em> de ce type. La mienne a une trappe fragilis\u00e9e mais qui tient bon et fait toujours son travail.<\/p>\n<p style=\"text-align: justify;\">La <em>HP-28S<\/em> se referme sur elle-m\u00eame. Elle n&rsquo;a donc pas besoin de housse. En utilisation, le clavier <em>alpha<\/em> peut aussi \u00eatre rabattu derri\u00e8re le clavier principal, la machine pouvant alors \u00eatre tenue dans une main.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Il y eut une mode des calculatrices \u00e0 double clavier \u00e0 la fin des ann\u00e9es 80. Les HP-28C et S, ainsi que les financi\u00e8res HP-18C, 19B, 19BII en furent les repr\u00e9sentantes chez Hewlett-Packard. Sharp de son c\u00f4t\u00e9 sortit les EL-5200 et EL-9000. Il y eut aussi Canon et s\u00fbrement quelques autres. La HP-28S \u00e9tait innovante, puissante et ch\u00e8re. Elle introduisait<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,15],"tags":[],"class_list":["post-1121","post","type-post","status-publish","format-standard","hentry","category-epoque-moderne","category-hewlett-packard"],"_links":{"self":[{"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/1121","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=1121"}],"version-history":[{"count":5,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/1121\/revisions"}],"predecessor-version":[{"id":6382,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/1121\/revisions\/6382"}],"wp:attachment":[{"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}