{"id":636,"date":"2023-03-30T16:49:42","date_gmt":"2023-03-30T14:49:42","guid":{"rendered":"https:\/\/mo5.com\/micral\/?p=636"},"modified":"2023-03-30T16:49:42","modified_gmt":"2023-03-30T14:49:42","slug":"premier-demarrage-du-micral-n","status":"publish","type":"post","link":"https:\/\/mo5.com\/en\/premier-demarrage-du-micral-n\/","title":{"rendered":"Checking that the Micral N is working properly and starting up for the first time"},"content":{"rendered":"

By Philippe Dubois, Chairman.<\/em><\/p>\n

In this, our eighth article, we're going to get a little more to the heart of the matter, because after studying and reverse engineering the Micral N's boards and even replacing a few components, we're finally going to get our example up and running for the first time, almost 50 years later!<\/p>\n

Indeed, the study and reverse engineering of the boards is well underway with Jean-Fran\u00e7ois, Sylvain and Arthur. We've taken all the boards out of our Micral N one by one over the past few weeks to take careful photos, or even scan them in high definition, and start drawing the circuits to document them and better understand how they work. All our work will soon be referenced on a dedicated website.<\/p>\n

\"Exemple<\/a>

Example of an analysis of the CPU board in our example of Micral N<\/p><\/div>\n

We're also taking advantage of the progress we've made restoring our copy of Micral N to produce a Live on the MO5 association's Twitch channel with our friend as guest star. E-Think<\/a>dedicated to the history of R2E and Micral N! The video is now available on our Youtube channel: Live on the history of Micral N<\/a>.<\/p>\n

<\/h2>\n

Replacing faulty RAM chips<\/h2>\n
Thanks to the device that Jean Fran\u00e7ois created especially for dumping ROMS and testing the very old, specific RAMs in our Micral N, we were able to determine that out of the dozens of chips in our machine, only one was defective! This is in stark contrast to the poor quality of the more modern RAM chips found in contemporary 8-bit microcomputers of the 1980s.<\/div>\n
\n
\n
<\/div>\n<\/div>\n<\/div>\n
\"Les<\/a>

The RAM chips in our copy of Micral N are all tested one by one!<\/p><\/div>\n

Fortunately, we were able to find RAM chips from the same series on a famous auction site in the USA, which were tested when they arrived of course, and one of which will replace the defective chip in our Micral N. As a reminder, these are SRAM (static random access memory) chips of 1024 bits each, or just 128 bytes!<\/p>\n

You can see what this historic 1972 SRAM chip looks like by following this link this link<\/a>.<\/p>\n

\"Les<\/a>

The 4 2102 series RAM chips received from the USA, all functional!<\/p><\/div>\n

The good news is that all the RAM chips we received are perfectly functional, even almost 50 years later, and we can now move ahead with the rest of the restoration of the machine.<\/p>\n

<\/h2>\n

Work session at Viveris and start-up of Micral N<\/h2>\n

We are therefore organising a new work session with our team of volunteers at our partner Viveris, who we would like to remind you is providing the association with a fantastic electronic laboratory at their premises in Rungis in the Ile de France region. We're still in full COVID mode, so masks are compulsory!<\/p>\n

\"L'\u00e9quipe<\/a>

The team meets again at Viveris to continue analysing the electronic boards of our Micral N<\/p><\/div>\n

Most of the team will be able to continue studying and testing the various electronic cards in our Micral N, with the possibility, if we don't detect any problems, of trying to get our machine up and running again for the first time! All the members present were highly motivated, and the atmosphere was excellent. We were joined for a few moments by a manager from Viveris, who was curious to appreciate our work on the machine.<\/p>\n

\"Test<\/a>

Power supply test and functional check on one of the electronic boards in our Micral N<\/p><\/div>\n

The main electronic cards that are important for the operation of the machine, at least in our current state of knowledge, are all going to be checked one by one, powered up and tested, to ensure that once they are in the chassis of the machine and powered up all together, nothing untoward happens. Jean-Fran\u00e7ois and Arthur have made combs to the right size so that each card can be plugged in.<\/p>\n

\"Jean-Fran\u00e7ois<\/a>

Jean-Fran\u00e7ois uses a thermal camera to check that the Micral N chips behave correctly when powered up.<\/p><\/div>\n

At the end of this project, the first piece of good news is that there are no problematic cards, and no components have suffered from being powered up again. We'll now be able to put all our cards back into the Micral N chassis so that we can look ahead to the next stage.<\/p>\n

In the meantime, Herv\u00e9 and Arthur are also busy adapting a carrying case that Arthur has brought back, which will be able to safely contain our Micral N and all its accessories: plugs, cables, power supplies, experiment boards, etc.<\/p>\n

\"Herv\u00e9<\/a>

Herv\u00e9 and Arthur cut the foam from a large professional carrying case to fit the shapes of our Micral N.<\/p><\/div>\n

We also took the opportunity to manufacture the power cables needed to supply the machine directly. The machine has two connectors on either side, each feeding one half of the backplane, to distribute the electrical load more evenly. This connector is very old and it's rather difficult to find one these days. Fortunately, a few have been found on the Mouser electronic components website.<\/p>\n

\"Les<\/a>

The power connectors on our Micral N are unconventional<\/p><\/div>\n

<\/h2>\n

Our Micral N is back in action!<\/h2>\n

Here we are at last! With the laboratory power supplies fitted to Viveris, carefully adjusted to the machine's operating supply voltages, and after a final check of the electronic boards one by one, we decided to electrically connect our Micral N in order to verify its behaviour. And that's the second piece of excellent news!<\/p>\n

\"Eur\u00e9ka<\/a>

Eureka! Our Micral N lights up!<\/p><\/div>\n

Our Micral N lights up! We're all very happy, and Sylvain can't wait to finally check everything we've understood so far about how this machine works and the code contained in its ROMs. With a few manipulations, we interrupt the machine's start-up cycle to arrive at its monitor, the contents of which (2 Kb) had been saved previously, as seen in the article : https:\/\/mo5.com\/lecture-et-sauvegarde-des-roms-du-micral-n\/<\/a><\/p>\n

Now that we've been reassured about the Micral N's electrical operation, we can take a closer look at how to make it run programs and start programming it! But all that will be covered in a later article.<\/p>\n

In the meantime, please don't forget to take part in the campaign to support our work! https:\/\/micral.mo5.com<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Par Philippe Dubois, Pr\u00e9sident. Pour ce huiti\u00e8me article, nous allons rentrer un peu plus encore dans le vif du sujet, puisque apr\u00e8s \u00e9tude, reverse engineering des cartes du Micral N et m\u00eame remplacement de quelques composants, nous allons enfin remettre en route pour la premi\u00e8re fois notre exemplaire, presque 50 ans plus tard ! Effectivement, l’\u00e9tude et le reverse engineering des cartes vont bon train avec Jean-Fran\u00e7ois, Sylvain et Arthur. Nous avons sorti toutes les cartes de notre Micral N une par une au cours des semaines pr\u00e9c\u00e9dentes pour les prendre soigneusement en photos voire les scanner en haute d\u00e9finition,\u00a0 et commencer \u00e0 en dessiner les circuits afin de les documenter et mieux comprendre comment elles fonctionnent. Tous nos travaux seront rapidement r\u00e9f\u00e9renc\u00e9s sur un site d\u00e9di\u00e9. Nous profitons d’ailleurs de nos avanc\u00e9es sur la restauration de notre exemplaire de Micral N pour produire un Live sur la chaine Twitch de l’association MO5 avec en guest star notre ami E-Penser, d\u00e9di\u00e9 \u00e0 l’histoire de la R2E et du Micral N ! La vid\u00e9o est maintenant visible sur notre chaine Youtube : Live sur l’histoire du Micral N. Remplacement des puces de RAM d\u00e9fectueuses Gr\u00e2ce \u00e0 l’appareil que Jean Fran\u00e7ois a cr\u00e9\u00e9 sp\u00e9cialement pour le dump des ROMS et le test des RAMs sp\u00e9cifiques car tr\u00e8s anciennes de notre Micral N, nous avons pu d\u00e9terminer que sur les quelques dizaines de puces que contient notre machine, une seule \u00e9tait d\u00e9ficiente ! Ce qui tranche radicalement avec la faible qualit\u00e9 des puces de RAM plus modernes que l’on va retrouver dans les micro-ordinateurs 8 bits contemporains des ann\u00e9es 80. Fort heureusement, nous avons pu trouver des puces RAM de la m\u00eame s\u00e9rie sur un c\u00e9l\u00e8bre site d’ench\u00e8res aux Etats-Unis, qui furent test\u00e9es \u00e0 leur arriv\u00e9e bien entendu, et dont l’une d’elle va donc remplacer la puce d\u00e9ficiente de notre Micral N. Pour rappel, ce sont des puces de SRAM (m\u00e9moire vive statique) de 1024 bits chacune, soit 128 octets seulement ! Vous pouvez voir \u00e0 quoi ressemble cette puce de SRAM historique de 1972 en suivant ce lien. C’est une bonne nouvelle en effet, toutes les puces de RAM re\u00e7ues sont parfaitement fonctionnelles, m\u00eame pr\u00e8s de 50 ans plus tard, et nous allons pouvoir avancer sereinement sur la suite de la restauration de la machine. S\u00e9ance de travail chez Viveris et d\u00e9marrage du Micral N Nous organisons d\u00e8s lors une nouvelle s\u00e9ance de travail avec notre \u00e9quipe de b\u00e9n\u00e9voles chez notre partenaire Viveris, qui nous le rappelons met \u00e0 disposition de l’association un formidable laboratoire \u00e9lectronique dans leurs locaux de Rungis en Ile de France. Nous sommes encore en pleine COVID, masque obligatoire ! La majeure partie de l’\u00e9quipe va pouvoir continuer d’\u00e9tudier et de tester les diff\u00e9rentes cartes \u00e9lectroniques de notre Micral N, avec la possibilit\u00e9, si nous ne d\u00e9tectons aucuns probl\u00e8me, d’essayer de remettre en marche pour la premi\u00e8re fois notre machine ! Tous les membres pr\u00e9sents sont tr\u00e8s motiv\u00e9s, l’ambiance est excellente. Nous avons \u00e9t\u00e9 rejoints pour quelques instants par un responsable de Viveris, curieux d’appr\u00e9cier notre travail sur la machine. Les principales cartes \u00e9lectroniques importantes pour le fonctionnement […]<\/p>\n","protected":false},"author":4,"featured_media":20365,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"give_campaign_id":0,"footnotes":""},"categories":[114,1485],"tags":[],"class_list":["post-636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite","category-micral"],"acf":[],"yoast_head":"\nV\u00e9rification de bon fonctionnement et premier d\u00e9marrage du Micral N - MO5.COM<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mo5.com\/en\/premier-demarrage-du-micral-n\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u00e9rification de bon fonctionnement et premier d\u00e9marrage du Micral N - MO5.COM\" \/>\n<meta property=\"og:description\" content=\"Par Philippe Dubois, Pr\u00e9sident. Pour ce huiti\u00e8me article, nous allons rentrer un peu plus encore dans le vif du sujet, puisque apr\u00e8s \u00e9tude, reverse engineering des cartes du Micral N et m\u00eame remplacement de quelques composants, nous allons enfin remettre en route pour la premi\u00e8re fois notre exemplaire, presque 50 ans plus tard ! Effectivement, l’\u00e9tude et le reverse engineering des cartes vont bon train avec Jean-Fran\u00e7ois, Sylvain et Arthur. Nous avons sorti toutes les cartes de notre Micral N une par une au cours des semaines pr\u00e9c\u00e9dentes pour les prendre soigneusement en photos voire les scanner en haute d\u00e9finition,\u00a0 et commencer \u00e0 en dessiner les circuits afin de les documenter et mieux comprendre comment elles fonctionnent. Tous nos travaux seront rapidement r\u00e9f\u00e9renc\u00e9s sur un site d\u00e9di\u00e9. Nous profitons d’ailleurs de nos avanc\u00e9es sur la restauration de notre exemplaire de Micral N pour produire un Live sur la chaine Twitch de l’association MO5 avec en guest star notre ami E-Penser, d\u00e9di\u00e9 \u00e0 l’histoire de la R2E et du Micral N ! La vid\u00e9o est maintenant visible sur notre chaine Youtube : Live sur l’histoire du Micral N. Remplacement des puces de RAM d\u00e9fectueuses Gr\u00e2ce \u00e0 l’appareil que Jean Fran\u00e7ois a cr\u00e9\u00e9 sp\u00e9cialement pour le dump des ROMS et le test des RAMs sp\u00e9cifiques car tr\u00e8s anciennes de notre Micral N, nous avons pu d\u00e9terminer que sur les quelques dizaines de puces que contient notre machine, une seule \u00e9tait d\u00e9ficiente ! Ce qui tranche radicalement avec la faible qualit\u00e9 des puces de RAM plus modernes que l’on va retrouver dans les micro-ordinateurs 8 bits contemporains des ann\u00e9es 80. Fort heureusement, nous avons pu trouver des puces RAM de la m\u00eame s\u00e9rie sur un c\u00e9l\u00e8bre site d’ench\u00e8res aux Etats-Unis, qui furent test\u00e9es \u00e0 leur arriv\u00e9e bien entendu, et dont l’une d’elle va donc remplacer la puce d\u00e9ficiente de notre Micral N. Pour rappel, ce sont des puces de SRAM (m\u00e9moire vive statique) de 1024 bits chacune, soit 128 octets seulement ! Vous pouvez voir \u00e0 quoi ressemble cette puce de SRAM historique de 1972 en suivant ce lien. C’est une bonne nouvelle en effet, toutes les puces de RAM re\u00e7ues sont parfaitement fonctionnelles, m\u00eame pr\u00e8s de 50 ans plus tard, et nous allons pouvoir avancer sereinement sur la suite de la restauration de la machine. S\u00e9ance de travail chez Viveris et d\u00e9marrage du Micral N Nous organisons d\u00e8s lors une nouvelle s\u00e9ance de travail avec notre \u00e9quipe de b\u00e9n\u00e9voles chez notre partenaire Viveris, qui nous le rappelons met \u00e0 disposition de l’association un formidable laboratoire \u00e9lectronique dans leurs locaux de Rungis en Ile de France. Nous sommes encore en pleine COVID, masque obligatoire ! La majeure partie de l’\u00e9quipe va pouvoir continuer d’\u00e9tudier et de tester les diff\u00e9rentes cartes \u00e9lectroniques de notre Micral N, avec la possibilit\u00e9, si nous ne d\u00e9tectons aucuns probl\u00e8me, d’essayer de remettre en marche pour la premi\u00e8re fois notre machine ! Tous les membres pr\u00e9sents sont tr\u00e8s motiv\u00e9s, l’ambiance est excellente. Nous avons \u00e9t\u00e9 rejoints pour quelques instants par un responsable de Viveris, curieux d’appr\u00e9cier notre travail sur la machine. Les principales cartes \u00e9lectroniques importantes pour le fonctionnement […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mo5.com\/en\/premier-demarrage-du-micral-n\/\" \/>\n<meta property=\"og:site_name\" content=\"MO5.COM\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/pages\/Association-MO5COM\/9540357570\" \/>\n<meta property=\"article:published_time\" content=\"2023-03-30T14:49:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mo5.com\/wp-content\/uploads\/2023\/01\/IMG_20211218_150136.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1440\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Philippe Dubois\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@assomo5\" \/>\n<meta name=\"twitter:site\" content=\"@assomo5\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Philippe Dubois\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/mo5.com\\\/premier-demarrage-du-micral-n\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/mo5.com\\\/premier-demarrage-du-micral-n\\\/\"},\"author\":{\"name\":\"Philippe Dubois\",\"@id\":\"https:\\\/\\\/mo5.com\\\/#\\\/schema\\\/person\\\/c389d0a47ac596b1fd688078cc054924\"},\"headline\":\"V\u00e9rification de bon fonctionnement et premier d\u00e9marrage du Micral N\",\"datePublished\":\"2023-03-30T14:49:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/mo5.com\\\/premier-demarrage-du-micral-n\\\/\"},\"wordCount\":1272,\"publisher\":{\"@id\":\"https:\\\/\\\/mo5.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/mo5.com\\\/premier-demarrage-du-micral-n\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/mo5.com\\\/wp-content\\\/uploads\\\/2023\\\/01\\\/IMG_20211218_150136.jpg\",\"articleSection\":[\"Actualit\u00e9\",\"Micral\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/mo5.com\\\/premier-demarrage-du-micral-n\\\/\",\"url\":\"https:\\\/\\\/mo5.com\\\/premier-demarrage-du-micral-n\\\/\",\"name\":\"V\u00e9rification de bon fonctionnement et premier d\u00e9marrage du Micral N - 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Pour ce huiti\u00e8me article, nous allons rentrer un peu plus encore dans le vif du sujet, puisque apr\u00e8s \u00e9tude, reverse engineering des cartes du Micral N et m\u00eame remplacement de quelques composants, nous allons enfin remettre en route pour la premi\u00e8re fois notre exemplaire, presque 50 ans plus tard ! Effectivement, l’\u00e9tude et le reverse engineering des cartes vont bon train avec Jean-Fran\u00e7ois, Sylvain et Arthur. Nous avons sorti toutes les cartes de notre Micral N une par une au cours des semaines pr\u00e9c\u00e9dentes pour les prendre soigneusement en photos voire les scanner en haute d\u00e9finition,\u00a0 et commencer \u00e0 en dessiner les circuits afin de les documenter et mieux comprendre comment elles fonctionnent. Tous nos travaux seront rapidement r\u00e9f\u00e9renc\u00e9s sur un site d\u00e9di\u00e9. Nous profitons d’ailleurs de nos avanc\u00e9es sur la restauration de notre exemplaire de Micral N pour produire un Live sur la chaine Twitch de l’association MO5 avec en guest star notre ami E-Penser, d\u00e9di\u00e9 \u00e0 l’histoire de la R2E et du Micral N ! La vid\u00e9o est maintenant visible sur notre chaine Youtube : Live sur l’histoire du Micral N. Remplacement des puces de RAM d\u00e9fectueuses Gr\u00e2ce \u00e0 l’appareil que Jean Fran\u00e7ois a cr\u00e9\u00e9 sp\u00e9cialement pour le dump des ROMS et le test des RAMs sp\u00e9cifiques car tr\u00e8s anciennes de notre Micral N, nous avons pu d\u00e9terminer que sur les quelques dizaines de puces que contient notre machine, une seule \u00e9tait d\u00e9ficiente ! Ce qui tranche radicalement avec la faible qualit\u00e9 des puces de RAM plus modernes que l’on va retrouver dans les micro-ordinateurs 8 bits contemporains des ann\u00e9es 80. Fort heureusement, nous avons pu trouver des puces RAM de la m\u00eame s\u00e9rie sur un c\u00e9l\u00e8bre site d’ench\u00e8res aux Etats-Unis, qui furent test\u00e9es \u00e0 leur arriv\u00e9e bien entendu, et dont l’une d’elle va donc remplacer la puce d\u00e9ficiente de notre Micral N. Pour rappel, ce sont des puces de SRAM (m\u00e9moire vive statique) de 1024 bits chacune, soit 128 octets seulement ! Vous pouvez voir \u00e0 quoi ressemble cette puce de SRAM historique de 1972 en suivant ce lien. C’est une bonne nouvelle en effet, toutes les puces de RAM re\u00e7ues sont parfaitement fonctionnelles, m\u00eame pr\u00e8s de 50 ans plus tard, et nous allons pouvoir avancer sereinement sur la suite de la restauration de la machine. S\u00e9ance de travail chez Viveris et d\u00e9marrage du Micral N Nous organisons d\u00e8s lors une nouvelle s\u00e9ance de travail avec notre \u00e9quipe de b\u00e9n\u00e9voles chez notre partenaire Viveris, qui nous le rappelons met \u00e0 disposition de l’association un formidable laboratoire \u00e9lectronique dans leurs locaux de Rungis en Ile de France. Nous sommes encore en pleine COVID, masque obligatoire ! La majeure partie de l’\u00e9quipe va pouvoir continuer d’\u00e9tudier et de tester les diff\u00e9rentes cartes \u00e9lectroniques de notre Micral N, avec la possibilit\u00e9, si nous ne d\u00e9tectons aucuns probl\u00e8me, d’essayer de remettre en marche pour la premi\u00e8re fois notre machine ! Tous les membres pr\u00e9sents sont tr\u00e8s motiv\u00e9s, l’ambiance est excellente. Nous avons \u00e9t\u00e9 rejoints pour quelques instants par un responsable de Viveris, curieux d’appr\u00e9cier notre travail sur la machine. 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