{"id":817,"date":"2014-11-18T21:41:30","date_gmt":"2014-11-18T21:41:30","guid":{"rendered":"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=817"},"modified":"2025-11-05T21:20:27","modified_gmt":"2025-11-05T21:20:27","slug":"mbo-alpha-30","status":"publish","type":"post","link":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/?p=817","title":{"rendered":"MBO ALPHA 30"},"content":{"rendered":"<p><a href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-280 size-full\" src=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-3.jpg\" alt=\"MBO30-3\" width=\"480\" height=\"640\" srcset=\"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-3.jpg 480w, https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-3-225x300.jpg 225w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">La <em>MBO Alpha 30<\/em> date de 1975. L&rsquo;afficheur est constitu\u00e9 de digits rouges dont les segments ne sont pas de simples barres <em>LED<\/em>, mais des micro-segments (presque des points). Huit chiffres pour la mantisse et 2 plus petits pour l&rsquo;exposant de 10.<\/p>\n<p style=\"text-align: justify;\">La machine est rapide, le r\u00e9sultat de la factorielle de <em>69<\/em> est obtenu en une petite seconde. On peut d&rsquo;ailleurs pousser plus loin puisque la <em>MBO<\/em> est capable d&rsquo;outrepasser sa capacit\u00e9 de &lt;1E100 et de donner les factorielles jusqu&rsquo;\u00e0 <em>99<\/em> (sous r\u00e9serve de fermer les yeux devant le symbole d&rsquo;erreur et de placer mentalement le chiffre \u00ab\u00a0<em>1<\/em>\u00a0\u00bb devant l&rsquo;exposant de 10.<\/p>\n<p style=\"text-align: justify;\">Le clavier est s\u00fbr. L&rsquo;alimentation est obtenue par 3 piles <em>AA<\/em> et un dispositif de veille \u00e9teint l&rsquo;affichage au bout de quelques secondes d&rsquo;inactivit\u00e9, ne laissant qu&rsquo;un petit trait rouge \u00e0 droite.<\/p>\n<p style=\"text-align: justify;\">A noter qu&rsquo;un t\u00e9moin sp\u00e9cifique, une barre oblique pr\u00e8s du signe <em>MOINS <\/em>indique qu&rsquo;on travaille en radians et non plus en degr\u00e9s.<\/p>\n<p><a href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-278 size-full\" src=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30.jpg\" alt=\"MBO30\" width=\"640\" height=\"480\" srcset=\"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30.jpg 640w, https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-300x225.jpg 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><a href=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-279 size-full\" src=\"http:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-2.jpg\" alt=\"MBO30-2\" width=\"600\" height=\"450\" srcset=\"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-2.jpg 600w, https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/wp-content\/uploads\/2014\/10\/MBO30-2-300x225.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La MBO Alpha 30 date de 1975. L&rsquo;afficheur est constitu\u00e9 de digits rouges dont les segments ne sont pas de simples barres LED, mais des micro-segments (presque des points). Huit chiffres pour la mantisse et 2 plus petits pour l&rsquo;exposant de 10. La machine est rapide, le r\u00e9sultat de la factorielle de 69 est obtenu en une petite seconde. On<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,23],"tags":[],"class_list":["post-817","post","type-post","status-publish","format-standard","hentry","category-machines-antiques","category-mbo"],"_links":{"self":[{"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/817","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=817"}],"version-history":[{"count":9,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/817\/revisions"}],"predecessor-version":[{"id":8756,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=\/wp\/v2\/posts\/817\/revisions\/8756"}],"wp:attachment":[{"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/le-rayon-des-calculatrices.fr\/WordPress3\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}