{"id":1446,"date":"2025-02-21T16:57:17","date_gmt":"2025-02-21T15:57:17","guid":{"rendered":"https:\/\/blog.udisks.ovh\/?p=1446"},"modified":"2026-02-10T17:18:44","modified_gmt":"2026-02-10T16:18:44","slug":"acorn-atom","status":"publish","type":"post","link":"https:\/\/www.mundocaos.com\/?p=1446","title":{"rendered":"Acorn Atom"},"content":{"rendered":"\n<p>El <strong>Atom<\/strong> es un ordenador personal fabricado por <strong><em>Acorn Computers Ltd<\/em><\/strong> entre 1980 y 1982. Su sustituto iba a ser el <strong>Proton<\/strong>, el cual ser\u00eda renombrado como <strong>BBC Micro<\/strong> al ganar el concurso de la <strong><em>BBC<\/em><\/strong> para informatizar las escuelas del Reino Unido.<\/p>\n\n\n\n<p>Acorn empez\u00f3 en 1979 fabricando diferentes ordenadores en placas est\u00e1ndar (<em>Eurocard<\/em>) que se conectaban a un bus (<em>backplane<\/em>), de forma similar a los Altair 8800, IMSAI 8080,&#8230;. El primer modelo se denomin\u00f3 <strong><em>Acorn Microcomputer<\/em><\/strong>, aunque posteriormente se le cambi\u00f3 el nombre a <strong><em>Acorn System 1<\/em><\/strong>, al sacar diferentes modelos: Acorn System 2, 3, 4 y 5. Todos estaban basados en el <strong>6502<\/strong> de <strong><em>MOS Technology<\/em><\/strong>.<\/p>\n\n\n\n<p>El <strong>Atom<\/strong> es una versi\u00f3n reducida del <strong><em>Acorn System 3<\/em><\/strong>, uno de sus modelos en formato Eurocard, al que se ha eliminado la unidad de disco y se ha a\u00f1adido un teclado integral y una interfaz de cinta cassette. Se vend\u00eda tanto en kit como totalmente construido. La versi\u00f3n m\u00ednima inclu\u00eda 2KB de RAM y 8KB de ROM, ampliables a un m\u00e1ximo de 12KB de RAM y 12 KB de ROM. Ten\u00eda disponible una extensi\u00f3n ROM con soporte de coma flotante.<\/p>\n\n\n\n<p>Los 2KB de RAM est\u00e1n divididos en:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1KB de <em>Block Zero RAM <\/em>(que adem\u00e1s de incluir los 256 bytes de la p\u00e1gina cero (<em>zero page<\/em>) del 6502, se utilizaban por el Atom BASIC para el almacenamiento de las 27 variables m\u00e1ximas disponibles)<\/li>\n\n\n\n<li>512 bytes para la memoria de pantalla.<\/li>\n\n\n\n<li>512 bytes para programas en modo texto, ya que no tiene modo gr\u00e1fico disponible.<\/li>\n<\/ul>\n\n\n\n<p>En el caso de tener la RAM ampliada al m\u00e1ximo de 12KB, tiene disponibles 5KB para programas, al utilizar los otros 6KB para los gr\u00e1ficos de alta resoluci\u00f3n. En el caso de no utilizar la alta resoluci\u00f3n, los 5.5KB se pueden utilizar para almacenar programas.<\/p>\n\n\n\n<p>Como procesador gr\u00e1fico utiliza un <strong>MC6847 VDG (<em>Video Display Generator<\/em>)<\/strong>, que proporciona salida tanto en video compuesto como en RF. Sin embargo este chip solo puede proporcionar salida de video a 60Hz, por lo que no se pod\u00eda utilizar en muchas teles europeas. Posteriormente tuvo disponible una tarjeta PAL 50Hz a color. El VDG proporciona seis modo de video, con resoluciones desde 64\u00d764 en 4 colores hasta 256\u00d7192 en blanco y negro.<\/p>\n\n\n\n<figure class=\"wp-block-table alignwide is-style-stripes\"><table class=\"has-tertiary-background-color has-background has-fixed-layout\"><thead><tr><th colspan=\"4\">Especificaciones t\u00e9cnicas<\/th><\/tr><\/thead><tbody><tr><td><strong>Nombre<\/strong><\/td><td colspan=\"3\">Atom<\/td><\/tr><tr><td><strong>Fabricante<\/strong><\/td><td colspan=\"3\">Acorn Computers Ltd.<\/td><\/tr><tr><td><strong>Pais<\/strong><\/td><td colspan=\"3\">U.K.<\/td><\/tr><tr><td><strong>A\u00f1o<\/strong><\/td><td colspan=\"3\">1980-1982<\/td><\/tr><tr><td><strong>Teclado<\/strong><\/td><td colspan=\"3\">QWERTY de 56 teclas<\/td><\/tr><tr><td><strong>Procesador<\/strong><\/td><td colspan=\"3\">MOS Technology 6502 @ 1 MHz&nbsp;<\/td><\/tr><tr><td><strong>Procesador Gr\u00e1fico<\/strong><\/td><td colspan=\"3\">MC6847 VDG (<em>Video Display Generator<\/em>)<\/td><\/tr><tr><td><strong>Procesador Sonido<\/strong><\/td><td colspan=\"3\">&#8211;<\/td><\/tr><tr><td><strong>RAM<\/strong><\/td><td colspan=\"3\">2KB ampliables a 12KB<\/td><\/tr><tr><td><strong>ROM<\/strong><\/td><td colspan=\"3\">8KB ampliables a 12KB<\/td><\/tr><tr><td><strong>Lenguaje integrado<\/strong><\/td><td colspan=\"3\">Atom BASIC<\/td><\/tr><tr><td><strong>Modos de Texto<\/strong><\/td><td colspan=\"3\"><\/td><\/tr><tr><td><strong>Modos Gr\u00e1ficos<\/strong><\/td><td colspan=\"3\">64\u00d764 @ 4 colores<br>64\u00d796 @ 4 colores<br>128\u00d796 @ b\/n<br>64\u00d7192 @ 4 colores<br>128\u00d7192 @ 2 colores<br>256\u00d7192 @ b\/n<\/td><\/tr><tr><td><strong>Sonido<\/strong><\/td><td colspan=\"3\">1 Canal de sonido<\/td><\/tr><tr><td><strong>Puertos de E\/S<\/strong><\/td><td colspan=\"3\"><\/td><\/tr><tr><td><strong>Alimentaci\u00f3n<\/strong><\/td><td colspan=\"3\">8V DC, 1.6 A<br><img decoding=\"async\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2024\/12\/Polarity_marking_center_positive-1-300x75.png\" alt=\"\"><\/td><\/tr><tr><td><strong>Perif\u00e9ricos<\/strong><\/td><td colspan=\"3\">Unidad de discos de 5\u00bc&#8221; y 100KB<br>Cinta cassette<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-base-color has-text-color has-background has-link-color has-large-font-size wp-elements-2cd8a2743dad55b10e6ea6eca357ec5d\" style=\"border-radius:50px;background-color:#0000ff;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\">COLECCI\u00d3N<\/h3>\n\n\n\n<p>Mi Atom es la versi\u00f3n m\u00ednima, por lo que solo tiene 4KB de RAM. Por este motivo tiene la mitad de los z\u00f3calos sin ocupar. Y adem\u00e1s, por la etiqueta trasera parece que se llev\u00f3 a un taller a reparar, donde imagino, que se qued\u00f3. No tiene tornillos para sujetar la carcasa y se ve que qued\u00f3 a medio reparar.<\/p>\n\n\n\n<p>Le han cambiado los dos reguladores de tensi\u00f3n originales (LM340T-5) por sendos 7805. Adem\u00e1s le han hecho un apa\u00f1o en el conector de alimentaci\u00f3n. Todo apunta a que le pegaron un tir\u00f3n al cable de alimentaci\u00f3n y arrancaron el conector, un trozo de pista y debi\u00f3 de hacer un corto&#8230;<\/p>\n\n\n\n<figure class=\"wp-block-table alignwide is-style-stripes has-medium-font-size\"><table class=\"has-cyan-bluish-gray-background-color has-background has-fixed-layout\"><thead><tr><th colspan=\"6\">Acorn Atom<\/th><\/tr><\/thead><tbody><tr><td>Modelo<\/td><td colspan=\"5\">4K<\/td><\/tr><tr><td>S\/N<\/td><td colspan=\"5\">Sin n\u00famero de serie<\/td><\/tr><tr><td>MB S\/N<\/td><td colspan=\"5\">90495<\/td><\/tr><tr><td>MB Model<\/td><td colspan=\"5\">202000 Issue 5<\/td><\/tr><tr><td>Funciona<\/td><td>SI<\/td><td>Estado<\/td><td>7<\/td><td>Caja<\/td><td>NO<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Como no he encontrado el conector de alimentaci\u00f3n original, ni ninguno con una huella igual a la de la placa, he utilizado un conector hembra de barril de 5,5 x 2,1 mm, que he soldado conect\u00e1ndolo en la huella original, y he hecho un puente del pin de tensi\u00f3n a una v\u00eda situada un poco m\u00e1s adelante de la de la pista arrancada.<\/p>\n\n\n\n<p>Para soldar el hilo a la v\u00eda he tenido que desoldar un condensador electrol\u00edtico que esta junto al conector. Esto me ha venido bien, ya que me ha permitido comprobarlo, y he visto que est\u00e1 da\u00f1ado. As\u00ed que he quitado el resto de condensadores (6 en total) y al comprobarlos, la mitad est\u00e1n da\u00f1ados. He sustituido los 6 y bingo&#8230; El Atom enciende y muestra salida por el v\u00eddeo compuesto. Pero algo sigue mal, ya que toda la pantalla est\u00e1 llena del car\u00e1cter &#8220;@&#8221;.  <\/p>\n\n\n\n<p>No he encontrado informaci\u00f3n de este caso en internet, pero lo bueno que tiene el Atom es que todos son circuitos integrados comunes (salvo la RAM) y vienen en z\u00f3calos. Uno a uno he comprobado todos los integrados, y uno de los 74LS04 est\u00e1 da\u00f1ado. Pero sigue igual<\/p>\n\n\n\n<p>Por lo que he le\u00eddo, el fallo m\u00e1s com\u00fan en los Atom es alguno de los chips de RAM (2114) y\/o el procesador de video MC6847. En un foro indican una forma de comprobar el fallo de la RAM: <\/p>\n\n\n\n<pre class=\"wp-block-preformatted\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\"<em>Intercambiar los integrados IC42 e IC43 para ver si la salida en pantalla var\u00eda. O cambiar el IC42 (VRAM) por cualquier otro 2114 del Atom, excepto los que est\u00e1n en IC51 e IC52 que son la Zero Page, y si estos no est\u00e1n bien, el Atom no arranca.<\/em>\".<\/pre>\n\n\n\n<p>He localizado la RAM en eBay, uPD2114LC-1 de NEC (en teor\u00eda). Cuando me ha llegado ya casi ten\u00eda a punto el Retro Chip Tester Professional. Finalmente he comprobado tanto la memoria original, como la nueva, y todos los integrados de SRAM pasan los test. En teor\u00eda ya solo queda de cambiar el MC6847.<\/p>\n\n\n\n<p>He cambiado el 6847, pero sigue haciendo lo mismo. Enciende con la pantalla toda llena de caracteres aleatorios en video normal e inverso&#8230;<\/p>\n\n\n\n<p>Tras varias pruebas, he leido la ROM con el <a href=\"https:\/\/8bit-museum.de\/hardware-projekte-chip-tester-english\/\" data-type=\"link\" data-id=\"https:\/\/8bit-museum.de\/hardware-projekte-chip-tester-english\/\">RCT<\/a> y parece que est\u00e1 vac\u00eda. La ROM es un MM52164GMF. Tras buscar por la red este modelo de ROM resulta que es compatible con la 2364, y que puede sustituirse por una EPROM.<\/p>\n\n\n\n<p>Primero he pedido este adaptador que me recomendo @cacharreo en Va de Retro. Al probarlo, no puedo instalar el adaptador en la placa, ya que la EPROM en el adaptador est\u00e1 desplazado a la derecha y roza contra tres resistencias que hay colocada en vertical&#8230;<\/p>\n\n\n\n<p>He pedido otro adaptador, <a href=\"https:\/\/github.com\/RetroStack\/2332_2364-ROM_Adapter\/tree\/main\" target=\"_blank\" rel=\"noreferrer noopener\">2332, 2364-ROM Adapter<\/a>, y tras recibirlo hace unos d\u00edas acabo de montarlo. He grabado una 27C64 con los dos ficheros de 4KB cada uno: &#8220;Atom BASIC Part 1.bin&#8221; y &#8220;Atom BASIC Part 2+COS.bin&#8221;.<\/p>\n\n\n\n<p>Ya muestra en pantalla:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"256\" height=\"192\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/02\/atom.png\" alt=\"\" class=\"wp-image-7585\" style=\"width:500px;height:auto\"\/><\/figure>\n\n\n\n<p>Pero no responde a las pulsaciones de las teclas. Luego me he acordado que una de las primeras pruebas que hice cuando mostraba la pantalla con caracteres extra\u00f1os,  fue probar con diferentes valores el circuito RC que se encarga de controlar la duraci\u00f3n de la se\u00f1al de <em>RESET<\/em>. He puesto los valores originales: (1K\u03a9 y 10\u03bcF\/16V), y sigue sin funcionar. He modificado el condensador por uno de 22\u03bcF\/16V. Y ha funcionado. Ya responden todas las teclas.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-base-color has-text-color has-background has-link-color has-large-font-size wp-elements-fffac3e3b50e64c2ad8d55a3ef4263b1\" style=\"border-radius:50px;background-color:#0000ff;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\">DOCUMENTACI\u00d3N<\/h3>\n\n\n\n<div id=\"filebird-document-library\">\n   <div class=\"njt-fbdl\">\n      <script type=\"application\/json\" id=\"fbdl-data\">\n{\"layout\":\"grid\",\"title\":\"Acorn Atom - 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     <div style=\"--fb-list-item-padding: 1.25rem;\n   --fb-list-item-font-size: 0.875rem;\n   --fb-grid-item-padding: 1.5rem;\n   --fb-grid-item-font-size: 1rem;\n   --fb-grid-icon-size: 4rem;\n   --fb-list-icon-size: 2.5rem;\n   --fb-color-primary-1: #007CBA;\n   --fb-color-primary-2: #0063A1;\n   --fb-color-secondary: #757575;\">\n         \n<div class=\"fbdl-search-control\">\n    <div class=\"fbdl-search-control-wrapper\">\n    <div class=\"fbdl-title\">\n        <svg width=\"40\" height=\"32\" viewBox=\"0 0 48 40\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n        <path d=\"M43.178 5.44153H19.1795C18.5049 5.44153 17.8302 5.15513 17.3483 4.6778L14.1678 1.43198C13.3004 0.477327 12.1438 0 10.8909 0H4.81897C2.12035 0 0 2.10024 0 4.77327V35.2267C0 37.8998 2.12035 40 4.81897 40H43.178C45.8766 40 47.997 37.8998 47.997 35.2267V10.2148C48.0933 7.54177 45.8766 5.44153 43.178 5.44153Z\" \/>\n        <\/svg>\n        <h2>ESQUEMAS<\/h2>\n    <\/div>\n    <div 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fill=\"currentColor\"><\/path>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M17.5 1.875H13.75C13.4048 1.875 13.125 2.15482 13.125 2.5V6.25C13.125 6.59518 13.4048 6.875 13.75 6.875H17.5C17.8452 6.875 18.125 6.59518 18.125 6.25V2.5C18.125 2.15482 17.8452 1.875 17.5 1.875ZM13.75 0C12.3693 0 11.25 1.11929 11.25 2.5V6.25C11.25 7.63071 12.3693 8.75 13.75 8.75H17.5C18.8807 8.75 20 7.63071 20 6.25V2.5C20 1.11929 18.8807 0 17.5 0H13.75Z\"\n                        fill=\"currentColor\"><\/path>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M17.5 13.125H13.75C13.4048 13.125 13.125 13.4048 13.125 13.75V17.5C13.125 17.8452 13.4048 18.125 13.75 18.125H17.5C17.8452 18.125 18.125 17.8452 18.125 17.5V13.75C18.125 13.4048 17.8452 13.125 17.5 13.125ZM13.75 11.25C12.3693 11.25 11.25 12.3693 11.25 13.75V17.5C11.25 18.8807 12.3693 20 13.75 20H17.5C18.8807 20 20 18.8807 20 17.5V13.75C20 12.3693 18.8807 11.25 17.5 11.25H13.75Z\"\n                        fill=\"currentColor\"><\/path>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M6.25 13.125H2.5C2.15482 13.125 1.875 13.4048 1.875 13.75V17.5C1.875 17.8452 2.15482 18.125 2.5 18.125H6.25C6.59518 18.125 6.875 17.8452 6.875 17.5V13.75C6.875 13.4048 6.59518 13.125 6.25 13.125ZM2.5 11.25C1.11929 11.25 0 12.3693 0 13.75V17.5C0 18.8807 1.11929 20 2.5 20H6.25C7.63071 20 8.75 18.8807 8.75 17.5V13.75C8.75 12.3693 7.63071 11.25 6.25 11.25H2.5Z\"\n                        fill=\"currentColor\"><\/path>\n                <\/svg>\n            <\/span>\n            <span data-layout=\"list\">\n                <svg class=\"\" width=\"16\" height=\"16\" viewBox=\"0 0 23 16\"\n                    xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                    <path d=\"M10.2222 2.90918H22.9999M10.2222 13.091H22.9999\" stroke=\"currentColor\" stroke-width=\"1.5\">\n                    <\/path>\n                    <ellipse cx=\"2.875\" cy=\"13.0909\" rx=\"2.875\" ry=\"2.90909\" fill=\"currentColor\"><\/ellipse>\n                    <ellipse cx=\"2.875\" cy=\"2.90909\" rx=\"2.875\" ry=\"2.90909\" fill=\"currentColor\"><\/ellipse>\n                <\/svg>\n            <\/span>\n        <\/div>\n    <\/div>\n<\/div>                  <div class=\"fbdl-spinner\">\n            <div class=\"fbdl-spinner-wrapper fbdl-hidden\">\n               <div class=\"spin\">\n               <div class=\"spinner-grow\"><\/div>\n               <\/div>\n               <div class=\"fbdl-spinner-text\">Loading<\/div>\n            <\/div>\n                                             \n\n\n<div class=\"fbdl-container\">\n    <div class=\"fbdl-gridview\">\n        <div class=\"fbdl-gridview-wrapper\">\n            <div class=\"fbdl-gridview-container\">\n                <div class=\"fbdl-grid fb-col-4\">\n                                                                                                                        <div class=\"fbdl-grid-item\">\n                        <div class=\"fbdl-grid-item-info\">\n                                                        <div\n                                class=\"fbdl-grid-thumbnail fbdl-thumbnail-cover\">\n                                <img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/102000-C-Circuit-Diagram-for-the-Atom-Microcomputer-300x212.jpg\" class=\"attachment-medium size-medium\" alt=\"Circuit Diagram for the Atom Microcomputer\" srcset=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/102000-C-Circuit-Diagram-for-the-Atom-Microcomputer-300x212.jpg 300w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/102000-C-Circuit-Diagram-for-the-Atom-Microcomputer-1024x724.jpg 1024w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/102000-C-Circuit-Diagram-for-the-Atom-Microcomputer-768x543.jpg 768w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/102000-C-Circuit-Diagram-for-the-Atom-Microcomputer.jpg 1527w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>                            <\/div>\n                                                        <div class=\"fbdl-grid-detail\">\n                                <div>\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/102000-C-Circuit-Diagram-for-the-Atom-Microcomputer.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"                                        class=\"fbdl-title\">\n                                        102,000-C Circuit Diagram for the Atom Microcomputer                                    <\/a>\n                                <\/div>\n                                                                                                <span\n                                    class=\"fbdl-file-size\">254 KB<\/span>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/102000-C-Circuit-Diagram-for-the-Atom-Microcomputer.jpg\" target=\"_blank\" download\n                            rel=\"noopener noreferrer\"\n                            class=\"fbdl-download-button\">Download<\/a>\n                    <\/div>\n                                                                                                                        <div class=\"fbdl-grid-item\">\n                        <div class=\"fbdl-grid-item-info\">\n                                                        <div\n                                class=\"fbdl-grid-thumbnail fbdl-thumbnail-cover\">\n                                <img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102002-C-Circuit-Diagram-for-Atom-Econet-PCB-300x212.jpg\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102002-C-Circuit-Diagram-for-Atom-Econet-PCB-300x212.jpg 300w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102002-C-Circuit-Diagram-for-Atom-Econet-PCB-1024x724.jpg 1024w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102002-C-Circuit-Diagram-for-Atom-Econet-PCB-768x543.jpg 768w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102002-C-Circuit-Diagram-for-Atom-Econet-PCB.jpg 1527w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>                            <\/div>\n                                                        <div class=\"fbdl-grid-detail\">\n                                <div>\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102002-C-Circuit-Diagram-for-Atom-Econet-PCB.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"                                        class=\"fbdl-title\">\n                                        102,002-C Circuit Diagram for Atom Econet PCB                                    <\/a>\n                                <\/div>\n                                                                                                <span\n                                    class=\"fbdl-file-size\">142 KB<\/span>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102002-C-Circuit-Diagram-for-Atom-Econet-PCB.jpg\" target=\"_blank\" download\n                            rel=\"noopener noreferrer\"\n                            class=\"fbdl-download-button\">Download<\/a>\n                    <\/div>\n                                                                                                                        <div class=\"fbdl-grid-item\">\n                        <div class=\"fbdl-grid-item-info\">\n                                                        <div\n                                class=\"fbdl-grid-thumbnail fbdl-thumbnail-cover\">\n                                <img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102003-C-Circuit-Diagram-for-Atom-50Hz-TV-Converter--300x212.jpg\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102003-C-Circuit-Diagram-for-Atom-50Hz-TV-Converter--300x212.jpg 300w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102003-C-Circuit-Diagram-for-Atom-50Hz-TV-Converter--1024x724.jpg 1024w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102003-C-Circuit-Diagram-for-Atom-50Hz-TV-Converter--768x543.jpg 768w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102003-C-Circuit-Diagram-for-Atom-50Hz-TV-Converter-.jpg 1527w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>                            <\/div>\n                                                        <div class=\"fbdl-grid-detail\">\n                                <div>\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102003-C-Circuit-Diagram-for-Atom-50Hz-TV-Converter-.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"                                        class=\"fbdl-title\">\n                                        102,003-C Circuit Diagram for Atom 50Hz TV Converter                                    <\/a>\n                                <\/div>\n                                                                                                <span\n                                    class=\"fbdl-file-size\">133 KB<\/span>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102003-C-Circuit-Diagram-for-Atom-50Hz-TV-Converter-.jpg\" target=\"_blank\" download\n                            rel=\"noopener noreferrer\"\n                            class=\"fbdl-download-button\">Download<\/a>\n                    <\/div>\n                                                                                                                        <div class=\"fbdl-grid-item\">\n                        <div class=\"fbdl-grid-item-info\">\n                                                        <div\n                                class=\"fbdl-grid-thumbnail fbdl-thumbnail-cover\">\n                                <img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102006-C-Atom-Colour-Board-PAL-Circuit-Diagram-300x212.jpg\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102006-C-Atom-Colour-Board-PAL-Circuit-Diagram-300x212.jpg 300w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102006-C-Atom-Colour-Board-PAL-Circuit-Diagram-1024x724.jpg 1024w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102006-C-Atom-Colour-Board-PAL-Circuit-Diagram-768x543.jpg 768w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102006-C-Atom-Colour-Board-PAL-Circuit-Diagram.jpg 1527w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>                            <\/div>\n                                                        <div class=\"fbdl-grid-detail\">\n                                <div>\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102006-C-Atom-Colour-Board-PAL-Circuit-Diagram.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"                                        class=\"fbdl-title\">\n                                        102,006-C Atom Colour Board (PAL) Circuit Diagram                                    <\/a>\n                                <\/div>\n                                                                                                <span\n                                    class=\"fbdl-file-size\">146 KB<\/span>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102006-C-Atom-Colour-Board-PAL-Circuit-Diagram.jpg\" target=\"_blank\" download\n                            rel=\"noopener noreferrer\"\n                            class=\"fbdl-download-button\">Download<\/a>\n                    <\/div>\n                                                                                                                        <div class=\"fbdl-grid-item\">\n                        <div class=\"fbdl-grid-item-info\">\n                                                        <div\n                                class=\"fbdl-grid-thumbnail fbdl-thumbnail-cover\">\n                                <img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102007-C-Atom-BBC-BASIC-Conversion-Card--300x212.jpg\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102007-C-Atom-BBC-BASIC-Conversion-Card--300x212.jpg 300w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102007-C-Atom-BBC-BASIC-Conversion-Card--1024x724.jpg 1024w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102007-C-Atom-BBC-BASIC-Conversion-Card--768x543.jpg 768w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102007-C-Atom-BBC-BASIC-Conversion-Card-.jpg 1527w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>                            <\/div>\n                                                        <div class=\"fbdl-grid-detail\">\n                                <div>\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102007-C-Atom-BBC-BASIC-Conversion-Card-.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"                                        class=\"fbdl-title\">\n                                        102,007-C Atom-BBC BASIC Conversion Card                                    <\/a>\n                                <\/div>\n                                                                                                <span\n                                    class=\"fbdl-file-size\">202 KB<\/span>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/102007-C-Atom-BBC-BASIC-Conversion-Card-.jpg\" target=\"_blank\" download\n                            rel=\"noopener noreferrer\"\n                            class=\"fbdl-download-button\">Download<\/a>\n                    <\/div>\n                                                                                                                        <div class=\"fbdl-grid-item\">\n                        <div class=\"fbdl-grid-item-info\">\n                                                        <div\n                                class=\"fbdl-grid-thumbnail fbdl-thumbnail-cover\">\n                                <img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/106000-C-Circuit-Diagram-for-Atom-Disc-Pack-FDC-Card-300x212.jpg\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/106000-C-Circuit-Diagram-for-Atom-Disc-Pack-FDC-Card-300x212.jpg 300w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/106000-C-Circuit-Diagram-for-Atom-Disc-Pack-FDC-Card-1024x724.jpg 1024w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/106000-C-Circuit-Diagram-for-Atom-Disc-Pack-FDC-Card-768x543.jpg 768w, https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/106000-C-Circuit-Diagram-for-Atom-Disc-Pack-FDC-Card.jpg 1527w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>                            <\/div>\n                                                        <div class=\"fbdl-grid-detail\">\n                                <div>\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/106000-C-Circuit-Diagram-for-Atom-Disc-Pack-FDC-Card.jpg\" target=\"_blank\" rel=\"noopener noreferrer\"                                        class=\"fbdl-title\">\n                                        106,000-C Circuit Diagram for Atom Disc Pack FDC Card                                    <\/a>\n                                <\/div>\n                                                                                                <span\n                                    class=\"fbdl-file-size\">197 KB<\/span>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/11\/106000-C-Circuit-Diagram-for-Atom-Disc-Pack-FDC-Card.jpg\" target=\"_blank\" download\n                            rel=\"noopener noreferrer\"\n                            class=\"fbdl-download-button\">Download<\/a>\n                    <\/div>\n                                                                                                                        <div class=\"fbdl-grid-item\">\n                        <div class=\"fbdl-grid-item-info\">\n                                                        <div\n                                class=\"fbdl-grid-thumbnail fbdl-thumbnail-cover\">\n                                <img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/09\/Atom-Memory-Map-pdf-300x212.jpg\" class=\"attachment-medium size-medium\" alt=\"\" \/>                            <\/div>\n                                                        <div class=\"fbdl-grid-detail\">\n                                <div>\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/09\/Atom-Memory-Map.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"                                        class=\"fbdl-title\">\n                                        Atom-Memory-Map                                    <\/a>\n                                <\/div>\n                                                                                                <span\n                                    class=\"fbdl-file-size\">29 KB<\/span>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/09\/Atom-Memory-Map.pdf\" target=\"_blank\" download\n                            rel=\"noopener noreferrer\"\n                            class=\"fbdl-download-button\">Download<\/a>\n                    <\/div>\n                                                                                                                        <div class=\"fbdl-grid-item\">\n                        <div class=\"fbdl-grid-item-info\">\n                                                        <div\n                                class=\"fbdl-grid-thumbnail fbdl-thumbnail-cover\">\n                                <img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/02\/ATOM-Schematic-202.000-issue-3-14-Jan-1981-pdf-1-300x212.jpg\" class=\"attachment-medium size-medium\" alt=\"\" \/>                            <\/div>\n                                                        <div class=\"fbdl-grid-detail\">\n                                <div>\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/02\/ATOM-Schematic-202.000-issue-3-14-Jan-1981.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"                                        class=\"fbdl-title\">\n                                        ATOM Schematic 202.000 issue 3 (14-Jan-1981)                                    <\/a>\n                                <\/div>\n                                                                                                <span\n                                    class=\"fbdl-file-size\"><\/span>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/02\/ATOM-Schematic-202.000-issue-3-14-Jan-1981.pdf\" target=\"_blank\" download\n                            rel=\"noopener noreferrer\"\n                            class=\"fbdl-download-button\">Download<\/a>\n                    <\/div>\n                                    <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>                                    <\/div>\n         <div class=\"fbdl-pagination\"><\/div>      <\/div>\n   <\/div>\n<\/div>\n\n\n<h5 class=\"wp-block-heading\">Otra documentaci\u00f3n de foros:<\/h5>\n\n\n\n<p>La RAM del Acorn Atom est\u00e1 formada por integrados de SRAM del tipo 2114. Estos consumen bastante energ\u00eda, hasta 35mA por integrado. Estos pueden reemplazarse por memorias SCM 21C14 de <strong><em>Solid State Scientific<\/em><\/strong>. Este es un integrado CMOS que reduce el consumo de energ\u00eda y por tanto, la disipaci\u00f3n de calor, aunque no pueden utilizarse para reemplazar la VRAM al tener requerimientos especiales de timing.<\/p>\n\n\n\n<p><strong>Lista de puentes en la placa<\/strong>, y su estado:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LK1 open -&gt; Este puente solo debe estar cerrado si el Atom solo utiliza 1KB de Video RAM. Es posible que no se deba instalar el integrado IC30 si este puente est\u00e1 cerrado.<\/li>\n\n\n\n<li>LK2 closed -&gt; Si esta puesto, entonces el chip VIA puede interrumpir a la CPU.<\/li>\n\n\n\n<li>LK3 open -&gt; Habilita las interrupciones desde PL8 (Econet, AtoMMC).<\/li>\n\n\n\n<li>LK4 erm &#8211; Puede no existir en todas las versiones de placas.<\/li>\n\n\n\n<li>LK5 open -&gt; Configuraci\u00f3n fija para la selecci\u00f3n del conjunto de colores, dejar como predeterminado.<\/li>\n\n\n\n<li>LK6 closed y LK7 closed -&gt; Puentean los reguladores de tensi\u00f3n, lo que implica que se utiliza una fuente de alimentaci\u00f3n regulada de 5V.<\/li>\n<\/ul>\n\n\n\n<p><strong>Posibles fallos y soluciones<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code alignwide has-tertiary-background-color has-text-color has-background has-link-color wp-elements-db12d2b457c9118e1871afd64a23a062\" style=\"color:#0000ff;padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\"><code>Although the values used for R38 (1k\u03a9) and C11 (10uF or 22uF) appear to meet the minimum time needed for a reset pulse (to meet the 6502s requirements), it is possible that they don\u2019t. Power on is the worst case scenario, as it takes time for the main oscillator to get going (the 6502 CPU needs a stable clock in order to reset correctly).\n\nAnd these values will not prevent multiple reset pulses if there is too much switch bounce from the BREAK key. Hence there may be an advantage in fitting a higher value component in either R38 (I suggest 2.2k\u03a9 if C11 is 22uF, or 4.72k\u03a9 if C11 is 10uF) or increasing the value of C11 (say up to 47uF) or both. Doing this will increase the length of the reset pulse.\n\nPressing the BREAK key, especially if the human holds it down for a period of time, increases the length of the resulting reset pulse, and of course, pressing BREAK does not affect the main oscillator which will just continue running.\n\nThe other problem is that the gate that this signal feeds, a 74LS04 (IC9) has a normal logic input and some type\/makes will produce an output that jitters rapidly between logic low and logic high if it experiences a slowly (to it) changing DC level at it\u2019s input pin while in the undefined area between valid logic low and logic high levels This can be made worse if it is in an electrically noisy environment like a computer.\n\nMost people did enlarge C11 to 47 uF to get a decent reset after powerup.<\/code><\/pre>\n\n\n\n<p>He cambiado C11, que inicialmente era de 22uF\/16V, a uno de 47uF\/25V.<\/p>\n\n\n\n<pre class=\"wp-block-code alignwide has-tertiary-background-color has-text-color has-background has-link-color wp-elements-263d555a70269f3dd6ad4501838b04c8\" style=\"color:#0000ff;padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\"><code>I would try the next steps:\n\n<strong>1. Start with minimal configuration<\/strong>:\n  RAM:\n    - Install IC's 10,11,51,52 (#0000-#03FF, #2800-#2BFF) (OK)\n    - Remove 2114's IC 12-19(#2C00-#3BFF) (OK)\n  VIDEO:\n    - Install IC's 42,43 (#8000-#83FF) (OK)\n    - Remove IC's 32-41 (#8400-#97FF) (OK)\n  ROM:\n    - Install IC 20 (#C000-#CFFF,#F000-#FFFF)\n    - Remove IC21,24 (Floating point #D000-#DFFF, Utility ROM #A000-#AFFF)\n  I\/O:\n    - Remove IC 1,2,3,4 (VIA + buffers)\n    - Remove IC 50, (printer buffer)\n    - Remove grey wire (probably printer bit7)\n<strong>2. Check VDG output<\/strong>:\n  - Try pin 9\/10 PL4 (composite video on monitor)\n  - Try SK1 (UHF modulator on TV) \n<strong>3. Check signals<\/strong>:\n  - Check power supply is between 4,95 and 5,05V\n  - Check if 5V is present on PL6\/7 (pin1 and 32)\n  - Check RST signal by pressing BRK-key (pin4 IC9 should go to 0V)\n  - Check RST signal by pressing BRK-key (pin35 IC25 should go to +5V)\n  - Check the 1 mHz signal with a scope on pin 37 IC 22 (6502)\n  - Check the 3.58 mHz signal with a scope on pin 33 IC 31 (6847)\n  - Check PHI2 on pin1 IC 9 and pin 6 IC9 with scope (6502)\n  - Check NRDS (pin 9 IC49)\n  - Check NWDS (pin 10 IC49)\n  - Check if RST, PHI2, NRDS and NWDS, +5V is measured on all chips\n<strong>4. Check re-soldered spots<\/strong>\n  - Check if there are no shortcuts or pins soldered together\n  - The best way is to remove the old solder and solder the pins again\n<strong>5. Check the IC's<\/strong>:\n  -  Try to exchange the 6847, 8255 or 6502\n\nIf this doesn't work then you have to trace the signals to find out where the problem lies.<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-base-color has-text-color has-background has-link-color has-large-font-size wp-elements-22eea1d4291bdd0a457c1c037a7db8e3\" style=\"border-radius:50px;background-color:#0000ff;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\">ARCHIVOS<\/h3>\n\n\n\n<p>Diferentes ROM&#8217;s del Atom.<\/p>\n\n\n\n<div id=\"filebird-document-library\">\n   <div class=\"njt-fbdl\">\n      <script type=\"application\/json\" id=\"fbdl-data\">\n{\"layout\":\"list\",\"title\":\"Ficheros Acorn Atom\",\"column\":4,\"structureDisplay\":{\"breadcrumb\":false,\"ajaxbreadcrumb\":false,\"nestedFolders\":false},\"displayColumn\":{\"size\":true,\"type\":true,\"modified\":false,\"download\":true,\"created\":false},\"itemFontSize\":{\"grid\":\"1rem\",\"list\":\"0.875rem\"},\"itemPadding\":{\"grid\":\"1.5rem\",\"list\":\"1.25rem\"},\"iconSize\":{\"grid\":\"3.5rem\",\"list\":\"3rem\"},\"linkTo\":\"none\",\"switchGridOnMobile\":false,\"popupPreview\":{\"width\":600,\"height\":600},\"additionalContent\":{\"caption\":false,\"description\":true,\"thumbnail\":false},\"libraryType\":\"single_folder\",\"searchScope\":\"narrow\",\"displayEmptyPlaceholder\":true,\"displayNestedFolderCount\":true,\"nestedFolderCountType\":\"counter_file_in_folder\",\"colors\":{\"primary1\":\"#007CBA\",\"primary2\":\"#0063A1\",\"secondary\":\"#757575\"},\"memberpress\":false,\"memberpress_field\":\"\",\"thumbnailObjectFit\":\"cover\",\"request\":{\"pagination\":{\"current\":1,\"limit\":10},\"search\":\"\",\"orderBy\":\"post_title\",\"orderType\":\"ASC\",\"selectedFolder\":[\"193\"],\"searchScope\":\"narrow\"},\"align\":\"wide\"}\n<\/script>\n      <div style=\"--fb-list-item-padding: 1.25rem;\n   --fb-list-item-font-size: 0.875rem;\n   --fb-grid-item-padding: 1.5rem;\n   --fb-grid-item-font-size: 1rem;\n   --fb-grid-icon-size: 3.5rem;\n   --fb-list-icon-size: 3rem;\n   --fb-color-primary-1: #007CBA;\n   --fb-color-primary-2: #0063A1;\n   --fb-color-secondary: #757575;\">\n         \n<div class=\"fbdl-search-control\">\n    <div class=\"fbdl-search-control-wrapper\">\n    <div class=\"fbdl-title\">\n        <svg width=\"40\" height=\"32\" viewBox=\"0 0 48 40\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n        <path d=\"M43.178 5.44153H19.1795C18.5049 5.44153 17.8302 5.15513 17.3483 4.6778L14.1678 1.43198C13.3004 0.477327 12.1438 0 10.8909 0H4.81897C2.12035 0 0 2.10024 0 4.77327V35.2267C0 37.8998 2.12035 40 4.81897 40H43.178C45.8766 40 47.997 37.8998 47.997 35.2267V10.2148C48.0933 7.54177 45.8766 5.44153 43.178 5.44153Z\" \/>\n        <\/svg>\n        <h2>Ficheros Acorn Atom<\/h2>\n    <\/div>\n    <div class=\"fbdl-input-search\">\n        <input placeholder=\"Search\" type=\"text\" \/>\n        <svg width=\"17\" height=\"16\" viewBox=\"0 0 19 18\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n        <path\n            d=\"M11.2445 0C6.96932 0 3.48907 3.5231 3.48907 7.85097C3.48907 9.40686 3.93956 10.8554 4.70804 12.0805L0 16.4083L1.42213 18L6.08601 13.7168C7.45514 14.9598 9.26592 15.7109 11.2445 15.7109C15.5198 15.7109 19 12.1878 19 7.85991C19 3.53204 15.5286 0 11.2445 0ZM11.2445 13.5648C8.13529 13.5648 5.60902 11.0075 5.60902 7.85991C5.60902 4.71237 8.13529 2.15499 11.2445 2.15499C14.3538 2.15499 16.8801 4.71237 16.8801 7.85991C16.8889 10.9985 14.3538 13.5648 11.2445 13.5648Z\"\n            fill=\"#383838\"\n        \/>\n        <\/svg>\n    <\/div>\n    <\/div>\n<\/div>                  <input type=\"text\" placeholder=\"Select\" autocomplete=\"off\" class=\"fbdl-tree-select fbdl-hidden\" \/>         \n<div class=\"fbdl-layout-control\">\n    <div class=\"fbdl-layout-control-wrapper\">\n        <div class=\"fbdl-layout-control-limit\"><span>Show<\/span>\n            <input type=\"number\" min=\"1\" max=\"3\"\n                value=\"3\"><span>files<\/span>\n        <\/div>\n        <div class=\"fbdl-layout-control-display\">\n            <span data-layout=\"grid\">\n                <svg class=\"\" width=\"16\" height=\"16\" viewBox=\"0 0 20 20\"\n                    fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M6.25 1.875H2.5C2.15482 1.875 1.875 2.15482 1.875 2.5V6.25C1.875 6.59518 2.15482 6.875 2.5 6.875H6.25C6.59518 6.875 6.875 6.59518 6.875 6.25V2.5C6.875 2.15482 6.59518 1.875 6.25 1.875ZM2.5 0C1.11929 0 0 1.11929 0 2.5V6.25C0 7.63071 1.11929 8.75 2.5 8.75H6.25C7.63071 8.75 8.75 7.63071 8.75 6.25V2.5C8.75 1.11929 7.63071 0 6.25 0H2.5Z\"\n                        fill=\"currentColor\"><\/path>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M17.5 1.875H13.75C13.4048 1.875 13.125 2.15482 13.125 2.5V6.25C13.125 6.59518 13.4048 6.875 13.75 6.875H17.5C17.8452 6.875 18.125 6.59518 18.125 6.25V2.5C18.125 2.15482 17.8452 1.875 17.5 1.875ZM13.75 0C12.3693 0 11.25 1.11929 11.25 2.5V6.25C11.25 7.63071 12.3693 8.75 13.75 8.75H17.5C18.8807 8.75 20 7.63071 20 6.25V2.5C20 1.11929 18.8807 0 17.5 0H13.75Z\"\n                        fill=\"currentColor\"><\/path>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M17.5 13.125H13.75C13.4048 13.125 13.125 13.4048 13.125 13.75V17.5C13.125 17.8452 13.4048 18.125 13.75 18.125H17.5C17.8452 18.125 18.125 17.8452 18.125 17.5V13.75C18.125 13.4048 17.8452 13.125 17.5 13.125ZM13.75 11.25C12.3693 11.25 11.25 12.3693 11.25 13.75V17.5C11.25 18.8807 12.3693 20 13.75 20H17.5C18.8807 20 20 18.8807 20 17.5V13.75C20 12.3693 18.8807 11.25 17.5 11.25H13.75Z\"\n                        fill=\"currentColor\"><\/path>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M6.25 13.125H2.5C2.15482 13.125 1.875 13.4048 1.875 13.75V17.5C1.875 17.8452 2.15482 18.125 2.5 18.125H6.25C6.59518 18.125 6.875 17.8452 6.875 17.5V13.75C6.875 13.4048 6.59518 13.125 6.25 13.125ZM2.5 11.25C1.11929 11.25 0 12.3693 0 13.75V17.5C0 18.8807 1.11929 20 2.5 20H6.25C7.63071 20 8.75 18.8807 8.75 17.5V13.75C8.75 12.3693 7.63071 11.25 6.25 11.25H2.5Z\"\n                        fill=\"currentColor\"><\/path>\n                <\/svg>\n            <\/span>\n            <span data-layout=\"list\">\n                <svg class=\"fbdl-layout-control-display-selected\" width=\"16\" height=\"16\" viewBox=\"0 0 23 16\"\n                    xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                    <path d=\"M10.2222 2.90918H22.9999M10.2222 13.091H22.9999\" stroke=\"currentColor\" stroke-width=\"1.5\">\n                    <\/path>\n                    <ellipse cx=\"2.875\" cy=\"13.0909\" rx=\"2.875\" ry=\"2.90909\" fill=\"currentColor\"><\/ellipse>\n                    <ellipse cx=\"2.875\" cy=\"2.90909\" rx=\"2.875\" ry=\"2.90909\" fill=\"currentColor\"><\/ellipse>\n                <\/svg>\n            <\/span>\n        <\/div>\n    <\/div>\n<\/div>                  <div class=\"fbdl-spinner\">\n            <div class=\"fbdl-spinner-wrapper fbdl-hidden\">\n               <div class=\"spin\">\n               <div class=\"spinner-grow\"><\/div>\n               <\/div>\n               <div class=\"fbdl-spinner-text\">Loading<\/div>\n            <\/div>\n                                             <div class=\"fbdl-container\">\n    <div class=\"fbdl-listview\">\n        <div class=\"fbdl-listview-wrapper\">\n            <div class=\"fbdl-listview-container\">\n                <div class=\"fbdl-list\">\n                    <table class=\"fbdl-table\">\n                        <thead>\n                            <tr>\n                                <th class=\"fbdl-table-first-header\">\n                                    <div class=\"fbdl-table-header-wrapper\">\n                                        <span>File<\/span>\n                                        \n<div class=\"fbdl-table-sort fbdl-sort-current\" data-orderby=\"post_title\">\n    <span data-order=\"ASC\" data-orderby=\"post_title\"\n        class=\"sort-asc fbdl-sort-selected\">\n        <svg style=\"transform: rotate(180deg)\" width=\"12\" height=\"6\" viewBox=\"0 0 14 8\" fill=\"none\"\n            xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n            <path\n                d=\"M12.9207 0.179932H6.69072H1.08072C0.120725 0.179932 -0.359275 1.33993 0.320725 2.01993L5.50072 7.19993C6.33072 8.02993 7.68073 8.02993 8.51073 7.19993L10.4807 5.22993L13.6907 2.01993C14.3607 1.33993 13.8807 0.179932 12.9207 0.179932Z\"\n                fill=\"currentColor\" \/>\n        <\/svg>\n    <\/span>\n    <span data-order=\"DESC\" data-orderby=\"post_title\"\n     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class=\"sort-asc fbdl-sort-unselected\">\n        <svg style=\"transform: rotate(180deg)\" width=\"12\" height=\"6\" viewBox=\"0 0 14 8\" fill=\"none\"\n            xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n            <path\n                d=\"M12.9207 0.179932H6.69072H1.08072C0.120725 0.179932 -0.359275 1.33993 0.320725 2.01993L5.50072 7.19993C6.33072 8.02993 7.68073 8.02993 8.51073 7.19993L10.4807 5.22993L13.6907 2.01993C14.3607 1.33993 13.8807 0.179932 12.9207 0.179932Z\"\n                fill=\"currentColor\" \/>\n        <\/svg>\n    <\/span>\n    <span data-order=\"DESC\" data-orderby=\"size\"\n        class=\"sort-desc fbdl-sort-unselected\">\n        <svg width=\"12\" height=\"6\" viewBox=\"0 0 14 8\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n            <path\n                d=\"M12.9207 0.179932H6.69072H1.08072C0.120725 0.179932 -0.359275 1.33993 0.320725 2.01993L5.50072 7.19993C6.33072 8.02993 7.68073 8.02993 8.51073 7.19993L10.4807 5.22993L13.6907 2.01993C14.3607 1.33993 13.8807 0.179932 12.9207 0.179932Z\"\n                fill=\"currentColor\" \/>\n        <\/svg>\n    <\/span>\n<\/div>                                    <\/div>\n                                <\/th>\n                                                                                                <th class=\"fbdl-table-header\">\n                                    <div>\n                                        Type                                    <\/div>\n                                <\/th>\n                                                                                                                                                                <th class=\"fbdl-table-last-header\">Download                                <\/th>\n                                                            <\/tr>\n                        <\/thead>\n                        <tbody>\n                                                                                                                                            \n                            <tr>\n                                <td class=\"fbdl-list-first-item\">\n                                    <div class=\"fbdl-list-item-icon\">\n                                                                                <div class=\"fbdl-list-item-icon-wrapper\">\n                                            <img decoding=\"async\" src=\"https:\/\/www.mundocaos.com\/wp-content\/plugins\/filebird-document-library-pro\/blocks\/assets\/icons\/zip.svg\"\n                                                alt=\"Acorn Atom BASIC Part 1\">\n                                        <\/div>\n                                                                                <div class=\"fbdl-list-item-title\">\n                                            <div>\n                                                <a href=\"javascript:;\">\n                                                    Acorn Atom BASIC Part 1                                                <\/a>\n                                                                                                                                                <p class=\"fbdl-list-item-description\">\n                                                    Imagen .bin del \nAcorn Atom BASIC Part 1 (4KB)<\/p>\n                                                                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/td>\n                                                                <td class=\"fbdl-list-item\">\n                                    <div>\n                                        4 KB                                    <\/div>\n                                <\/td>\n                                                                                                <td class=\"fbdl-list-item\">\n                                    <div>zip<\/div>\n                                <\/td>\n                                                                                                                                                                <td class=\"fbdl-list-last-item\">\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/Atom-BASIC-Part-1.bin_.zip\" target=\"_blank\" download\n                                        rel=\"noopener noreferrer\">\n                                        Download                                    <\/a>\n                                <\/td>\n                                                            <\/tr>\n                                                                                                                                            \n                            <tr>\n                                <td class=\"fbdl-list-first-item\">\n                                    <div class=\"fbdl-list-item-icon\">\n                                                                                <div class=\"fbdl-list-item-icon-wrapper\">\n                                            <img decoding=\"async\" src=\"https:\/\/www.mundocaos.com\/wp-content\/plugins\/filebird-document-library-pro\/blocks\/assets\/icons\/zip.svg\"\n                                                alt=\"Acorn Atom BASIC Part 2 + COS\">\n                                        <\/div>\n                                                                                <div class=\"fbdl-list-item-title\">\n                                            <div>\n                                                <a href=\"javascript:;\">\n                                                    Acorn Atom BASIC Part 2 + COS                                                <\/a>\n                                                                                                                                                <p class=\"fbdl-list-item-description\">\n                                                    Imagen .bin del \nAcorn Atom BASIC Part 2 + COS (4KB)<\/p>\n                                                                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/td>\n                                                                <td class=\"fbdl-list-item\">\n                                    <div>\n                                        4 KB                                    <\/div>\n                                <\/td>\n                                                                                                <td class=\"fbdl-list-item\">\n                                    <div>zip<\/div>\n                                <\/td>\n                                                                                                                                                                <td class=\"fbdl-list-last-item\">\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/10\/Atom-BASIC-Part-2COS.bin_.zip\" target=\"_blank\" download\n                                        rel=\"noopener noreferrer\">\n                                        Download                                    <\/a>\n                                <\/td>\n                                                            <\/tr>\n                                                                                                                                            \n                            <tr>\n                                <td class=\"fbdl-list-first-item\">\n                                    <div class=\"fbdl-list-item-icon\">\n                                                                                <div class=\"fbdl-list-item-icon-wrapper\">\n                                            <img decoding=\"async\" src=\"https:\/\/www.mundocaos.com\/wp-content\/plugins\/filebird-document-library-pro\/blocks\/assets\/icons\/zip.svg\"\n                                                alt=\"Fichero ZIP con diferentes im\u00e1genes de ROM&#039;s para el Acorn Atom\">\n                                        <\/div>\n                                                                                <div class=\"fbdl-list-item-title\">\n                                            <div>\n                                                <a href=\"javascript:;\">\n                                                    acorn_roms                                                <\/a>\n                                                                                                                                                <p class=\"fbdl-list-item-description\">\n                                                    Fichero ZIP con diferentes im\u00e1genes de ROM&#039;s para el Acorn Atom<\/p>\n                                                                                            <\/div>\n                                        <\/div>\n                                    <\/div>\n                                <\/td>\n                                                                <td class=\"fbdl-list-item\">\n                                    <div>\n                                        81 KB                                    <\/div>\n                                <\/td>\n                                                                                                <td class=\"fbdl-list-item\">\n                                    <div>zip<\/div>\n                                <\/td>\n                                                                                                                                                                <td class=\"fbdl-list-last-item\">\n                                    <a href=\"https:\/\/www.mundocaos.com\/wp-content\/uploads\/2025\/09\/acorn_roms.zip\" target=\"_blank\" download\n                                        rel=\"noopener noreferrer\">\n                                        Download                                    <\/a>\n                                <\/td>\n                                                            <\/tr>\n                                                    <\/tbody>\n                    <\/table>\n                <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>                                    <\/div>\n         <div class=\"fbdl-pagination\"><\/div>      <\/div>\n   <\/div>\n<\/div>\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-base-color has-text-color has-background has-link-color has-large-font-size wp-elements-674e4a7c8b25500c2a1b6d9dfad25f20\" style=\"border-radius:50px;background-color:#0000ff;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\">ENLACES<\/h3>\n\n\n\n<p><a href=\"https:\/\/www.theoddys.com\/acorn\/acorn_system_computers\/atom\/atom.html\" target=\"_blank\" rel=\"noreferrer noopener\">The Acorn Atom<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/hoglet67\/AtomRamAndNoiseKiller\" target=\"_blank\" rel=\"noreferrer noopener\">8Kx8 Video RAM and Noise Killer for the Acorn Atom<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/stardot.org.uk\/forums\/viewtopic.php?t=6003\" target=\"_blank\" rel=\"noreferrer noopener\">Atom MC6847 noisekiller<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/retrorepairsandrefurbs.com\/2021\/09\/22\/my-1982-acorn-atom\/\" target=\"_blank\" rel=\"noreferrer noopener\">Adam&#8217;s Vintage Computer Restorations: Acorn Atom: Restoration<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/linuxjedi.co.uk\/acorn-atom-restoration-part-1\/\" target=\"_blank\" rel=\"noreferrer noopener\">LinuxJedi&#8217;s \/dev\/null: Acorn Atom Restoration<\/a><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-acorn-atom wp-block-embed-acorn-atom\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"LCXK4MCODW\"><a href=\"https:\/\/site.acornatom.nl\/\">Welkom op Acorn Atom . nl<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;Welkom op Acorn Atom . nl&#8221; &#8212; Acorn Atom\" src=\"https:\/\/site.acornatom.nl\/embed\/#?secret=6MXhwegqMY#?secret=LCXK4MCODW\" data-secret=\"LCXK4MCODW\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><a href=\"https:\/\/hackjunk.com\/2024\/04\/26\/acorn-atom-reworked\/\" target=\"_blank\" rel=\"noreferrer noopener\">Acorn Atom Reworked<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.stardot.org.uk\/forums\/viewtopic.php?t=30101\" target=\"_blank\" rel=\"noreferrer noopener\">Incoming Acorn Atom Issue 5 Replica<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/theoddys.com\/acorn\/replica_boards\/replica_atom\/replica_atom.html\" target=\"_blank\" rel=\"noreferrer noopener\">Replica Atom<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/diy.acornatom.nl\/introduction.html\" target=\"_blank\" rel=\"noreferrer noopener\">Build Your Own Acorn Atom<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.stardot.org.uk\/forums\/viewtopic.php?t=26154\" target=\"_blank\" rel=\"noreferrer noopener\">Combined VGA \/ Tube interface board for Atom<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/site.acornatom.nl\/\" target=\"_blank\" rel=\"noreferrer noopener\">Welcome to Acorn Atom . nl<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.zeridajh.org\/articles\/me_cmos_ram_for_the_acorn_atom\/index.html\" target=\"_blank\" rel=\"noreferrer noopener\">CMOS RAM for the Acorn Atom<\/a><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-hackjunk-com wp-block-embed-hackjunk-com\" style=\"margin-right:0;margin-left:0\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"ln5fwlt1Q4\"><a href=\"https:\/\/hackjunk.com\/2025\/03\/24\/acorn-atom-reworked\/\">Acorn Atom reworked<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;Acorn Atom reworked&#8221; &#8212; Hackjunk.com\" src=\"https:\/\/hackjunk.com\/2025\/03\/24\/acorn-atom-reworked\/embed\/#?secret=krTdEKw4H1#?secret=ln5fwlt1Q4\" data-secret=\"ln5fwlt1Q4\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-acorn-atom wp-block-embed-acorn-atom\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"vyEMVzOYjo\"><a href=\"https:\/\/site.acornatom.nl\/hardware\/atom-hardware\/reparatie\/\">Reparatie<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;Reparatie&#8221; &#8212; Acorn Atom\" src=\"https:\/\/site.acornatom.nl\/hardware\/atom-hardware\/reparatie\/embed\/#?secret=JrBUvaEBMM#?secret=vyEMVzOYjo\" data-secret=\"vyEMVzOYjo\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><a href=\"https:\/\/silicon-heaven.com\/atom\/Atom_Parts.html\">https:\/\/silicon-heaven.com\/atom\/Atom_Parts.html<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>El Atom es un ordenador personal fabricado por Acorn Computers Ltd entre 1980 y 1982. Su sustituto iba a ser el Proton, el cual ser\u00eda renombrado como BBC Micro al ganar el concurso de la BBC para informatizar las escuelas del Reino Unido. Acorn empez\u00f3 en 1979 fabricando diferentes ordenadores en placas est\u00e1ndar (Eurocard) que [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1450,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48,103,118,132],"tags":[49,70],"class_list":["post-1446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-acorn","category-atom","category-ok","category-uk","tag-acorn","tag-atom"],"_links":{"self":[{"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=\/wp\/v2\/posts\/1446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1446"}],"version-history":[{"count":123,"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=\/wp\/v2\/posts\/1446\/revisions"}],"predecessor-version":[{"id":8396,"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=\/wp\/v2\/posts\/1446\/revisions\/8396"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=\/wp\/v2\/media\/1450"}],"wp:attachment":[{"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mundocaos.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}