Altairduino : Un Altair Comme En 1975

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Altairduino : Un Altair Comme En 1975 011_218 18/04/18 13:10 Page11 ALTAIR Matériel AltairDuino : François Tonic un Altair comme en 1975 :-) etour 43 ans en arrière. Nous Arduino Uno avec un processeur ARM 32 sommes en 1975, un constructeur bits et 512 Ko de RAM. Nous retrouvons le Rspécialisé dans l’électronique, MITS, même principe de commutateurs et de décide de se lancer dans le micro-ordina- LEDS… teur. Le micro-ordinateur était déjà connu Deux modèles sont possibles : en kit à mon- en France grâce au Micral N, le tout pre- ter et à souder soi-même ou entièrement mier ordinateur au monde. La révolution monté. Le montage n’est pas forcément est possible avec l’utilisation du micropro- difficile mais il est long et il faut aimer la cesseur, le fameux CPU : l’Intel 8080. MITS soudure. Comme ce n’est pas notre grande est dans la brèche ouverte par le Micral et passion, nous avons opté pour la version sort l’Altair 8800 ! montée. Il est lourd et gros. Il utilise le processeur Au déballage, nous savons qu’il ne s’agit 8080A d’Intel cadencé à 2 Mhz. Il em- pas du vrai de 1975 mais nous sommes im- barque une mémoire vive de 256 octets, pressionnés par la bête. C’est une extensible à 64 Ko ! L’Altair bouleverse l’in- expérience à part. formatique de cette époque : il tient dans Pour faciliter son utilisateur et surtout pou- lève le 3; un boîtier “compact”, il est extensible (par voir utiliser les programmes disponibles sur • on baisse AUX1; des cartes) et son prix de vente est très rai- la machine, on se connecte à l’AltairDuino • on boote sur le disque ; sonnable. Deux versions sont proposées : en USB, Bluetooth ou en série. Pour fonc- • Si tout se passe bien, le terminal affiche : en kit à assembler ou tout monté. Le suc- tionner, un simulateur d’Altair a été MEMORY SIZE. On appuie simplement cès arrive immédiatement. Et pourtant, développé (Altair 8800 Simulator) est em- sur Entrée; l’Altair n’a ni clavier, ni écran, ni stockage. barqué sur l’Arduino. • INTERRUPTS : on tape Y; Les commandes se font en actionnant des Ce simulateur offre la capacité de mémoire • HIGHEST DISK NUMBER : on tape 0; commutateurs en façade et les réponses de l’original (64 Ko) et il tourne à la même • DISK FILES et RANDOM FILES : on ré- sont données par des LEDS. Il est possible vitesse. Il supporte les lecteurs de disquettes pond 4. de lire des programmes grâce à des bandes et les disques durs de l’Altair. Plusieurs logi- Si tout se passe bien le terminal affichera : perforées, en rajoutant un lecteur de ciels sont disponibles par défaut sur notre 055797 BYTES AVAILABLE bandes… K7 et disquettes arriveront après. clone : l’Altair Basic, CP/M, Zork, Altair DOS MONITOR VER 1.0 Deux inconnus, Paul Allen et Bill Gates, DOS, Supercalc. De quoi déjà tester la Pour réinitialiser l’Altair, il suffit de : lever vont créer le premier BASIC accessible : bête. STOP puis RESET. La machine est prête à l’Altair Basic. Eh oui, c’est grâce à l’Altair charger un autre programme. 8800 que Microsoft est né ! Cette histoire Putty & commutateurs Notez que l’ALTAIR n’aime pas les minus- est un des mythes fondateurs de la micro- L’AltairDuino est livré avec un câble USB et cules. informatique : quand les deux développeurs son alimentation. Allumez la machine. obtiennent un rendez-vous, le BASIC n’était PUTTY est vivement recommandé ou un Conclusion pas développé. Un mois plus tard, le langa- équivalent si vous n’êtes pas sous Windows. Utiliser l’AltairDuino c’est comme retourner ge est prêt à être testé alors qu’il avait été Il faut repérer le port de communication de dans l’âge de pierre de l’informatique. créé sur un autre ordinateur car ils ne pos- la carte Arduino puis dans PUTTY mettre Mais honnêtement, c’est une expérience à sédaient pas d’Altair. La démonstration se le bon port COM et la vitesse 115200 faire! Surtout quand on joue à actionner les déroule très bien… bauds. Si la connexion est faite, les LEDS commutateurs. Rassurez-vous, on trouve Les + Aujourd’hui, l’Altair est très difficile à trou- clignotent brièvement. Et la session PUTTY rapidement les réflexes… Pour les curieuses • Ambiance 1975 ver. Et prévoyez un solide compte en s’ouvre. / ieux, nous vous invitons à lire la documen- • Qualité du modèle banque pour vous l’offrir : 2500 à 3000 Comme nous sommes sur un Altair, nous tation : Altair 8800 Simulator. • Les logiciels minimum. allons jouer du commutateur. Chargeons Un grand bravo à l’équipe d’AltairDuino ! • Interface Putty maintenant l’ALTAIR BASIC : Et nous, on l’adore notre Altair. • Bonjour l’AltairDuino ! • on lève les commutateurs 1 et 12; Les – • Ou sinon, vous pouvez opter pour une solu- • on abaisse AUX2; Logiciels disponibles Tarifs : tion plus simple : l’AltairDuino. Comme son • sur le Terminal : DISK02.DSK Altair DOS limités modèle en kit : 149,95 $ • nom l’indique, il s’agit d’une réplique fonc- 1.0 doit s’afficher; Manque d’exemples modèle assemblé : 249,95 $ pour aller plus loin tionnelle de l’Altair8800 basée sur une • on abaisse les commutateurs 1 et 12 et https://www.altairduino.com programmez.com Mai 2018 programmez! 218 11.
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