{"id":13208,"date":"2025-07-06T17:37:52","date_gmt":"2025-07-06T17:37:52","guid":{"rendered":"https:\/\/www.fambach.net\/?p=13208"},"modified":"2026-05-10T11:27:21","modified_gmt":"2026-05-10T11:27:21","slug":"retro_pojekt-retro-projekt-monotech-isa-doublerom","status":"publish","type":"post","link":"https:\/\/www.fambach.net\/en\/retro_pojekt-retro-projekt-monotech-isa-doublerom\/","title":{"rendered":"Retro Project \u2013 Monotech ISA Double ROM"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Contents\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Link_zum_Projekt\" title=\"Link to the project\">Link to the project<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Ansichten\" title=\"Views\">Views<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Fakten\" title=\"Facts\">Facts<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Schaltplane\" title=\"Circuit diagrams\">Circuit diagrams<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Dokumentation\" title=\"Documentation\">Documentation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Zusammenbau\" title=\"Assembly\">Assembly<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Platine\" title=\"Record\">Record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Bauteile\" title=\"Components\">Components<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Aufbau\" title=\"Structure\">Structure<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Varianten\" title=\"Variations\">Variations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Reihenfolge\" title=\"Order\">Order<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Inbetriebnahme\" title=\"Commissioning\">Commissioning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Sonstiges\" title=\"Miscellaneous\">Miscellaneous<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Generelle_Tips\" title=\"General Tips\">General Tips<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Lotstellen\" title=\"Soldering points\">Soldering points<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Probleme\" title=\"Problems\">Problems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Fazit\" title=\"Conclusion\">Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Verwandte_Beitrage\" title=\"Related Posts\">Related Posts<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Quellen\" title=\"Sources\">Sources<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Zum_Projekt\" title=\"To the project\">To the project<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Retro_Seiten\" title=\"Retro pages\">Retro pages<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Retro_Foren\" title=\"Retro Forensics\">Retro Forensics<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Retro_Shops\" title=\"Retro Shops\">Retro Shops<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/#Logbuch\" title=\"Logbook\">Logbook<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>Why take a card with just one ROM when you can get one that has two? That's exactly what the developers at Monotech probably thought, and they've laid out a Double ROM card, and even better, they've made the hardware open source. So, if you don't want to tinker yourself, you can get here\u2026 <a href=\"https:\/\/monotech.fwscart.com\/category\/cards\">here <\/a>buy the original assembled with many other beautiful projects (This advert is not sponsored \ud83d\ude09).  <\/p>\n\n\n\n<p><strong>ADDENDUM <\/strong>With every new circuit board with switches, I usually have the problem that my switches don't fit the stock. This time I ordered SMD switches and bent the pins so that they fit into the holes.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Link_zum_Projekt\"><\/span>Link to the project<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p><a href=\"https:\/\/github.com\/monotech\/ISA-DoubleROM\">Link to the project<\/a><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ansichten\"><\/span>Views<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200416.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"662\" data-id=\"13211\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200416-1024x662.jpg\" alt=\"\" class=\"wp-image-13211\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200416-1024x662.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200416-300x194.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200416-768x496.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200416.jpg 1286w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><\/a><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM \u2013 Front board only<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200359-2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"698\" data-id=\"13212\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200359-2-1024x698.jpg\" alt=\"\" class=\"wp-image-13212\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200359-2-1024x698.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200359-2-300x205.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200359-2-768x524.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200359-2-1536x1047.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_200359-2-2048x1396.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><\/a><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM \u2013 Backplate Only<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"710\" data-id=\"13213\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-1024x710.jpg\" alt=\"\" class=\"wp-image-13213\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-1024x710.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-300x208.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-768x533.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-1536x1066.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-2048x1421.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><\/a><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM \u2013 Populated PCB Front<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190622-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"720\" data-id=\"13214\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190622-1024x720.jpg\" alt=\"\" class=\"wp-image-13214\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190622-1024x720.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190622-300x211.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190622-768x540.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190622-1536x1079.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190622-2048x1439.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><\/a><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM \u2013 Populated PCB Rear<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_192851-1-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"671\" data-id=\"13948\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_192851-1-1024x671.jpg\" alt=\"\" class=\"wp-image-13948\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_192851-1-1024x671.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_192851-1-300x197.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_192851-1-768x503.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_192851-1-1536x1007.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_192851-1-2048x1342.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><\/a><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM \u2013 With red DIP switches<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_193110-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"707\" data-id=\"13949\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_193110-1024x707.jpg\" alt=\"\" class=\"wp-image-13949\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_193110-1024x707.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_193110-300x207.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_193110-768x530.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_193110-1536x1060.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250706_193110-2048x1414.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><\/a><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM \u2013 With low-cost EPROM sockets<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fakten\"><\/span>Facts<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<ul>\n<li>Space for two EEPROMs.<\/li>\n\n\n\n<li>For each ROM, you can choose between 8K and 32K (the labelling on the circuit board is incorrect)<\/li>\n\n\n\n<li>The address can be set using the DIP switches next to the relevant ROM.<\/li>\n\n\n\n<li>Two DIP switches are reserved for the ROM setup: ROM Active and Write Permission.<\/li>\n\n\n\n<li>A 74LS688 under the ROM handles the connection to the bus (chip select)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Schaltplane\"><\/span>Circuit diagrams<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\"  class=\"wp-block-file__embed\" data=\"https:\/\/www.fambach.net\/wp-content\/uploads\/monotech_iusa_rom_schaltplan.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"Embed of monotech_iusa_rom_schaltplan.\"><\/object><a id=\"wp-block-file--media-12746b7c-9dc1-4671-9780-6ab1099d031c\" href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/monotech_iusa_rom_schaltplan.pdf\">monotech_iusa_rom_circuit_diagram<\/a><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/monotech_iusa_rom_schaltplan.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-12746b7c-9dc1-4671-9780-6ab1099d031c\">Download<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Dokumentation\"><\/span>Documentation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The DIP switch and the switch to the right of the socket each control the settings for that socket. The available settings are the same for both sockets. It is also possible to use just one ROM; if two ROMs are used, care must be taken to ensure that they use different address ranges.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DIP switch<\/h3>\n\n\n\n<p>Here is a description of the DIP switch settings.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Address<\/th><th>1<\/th><th>2<\/th><th>3<\/th><th>4<\/th><\/tr><\/thead><tbody><tr><td>C000<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>C200<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>C400<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>C600<\/td><td>0<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>C800<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>CA00<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>CC00<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>CE00<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>D000<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>D200<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>D400<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>D600<\/td><td>1<\/td><td>0<\/td><td>1<\/td><td>1<\/td><\/tr><tr><td>D800<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>DA00<\/td><td>1<\/td><td>1<\/td><td>0<\/td><td>1<\/td><\/tr><tr><td>DC00<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>0<\/td><\/tr><tr><td>DE00<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM - DIP switch address setting<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Description<\/th><th>5<\/th><th>6<\/th><\/tr><\/thead><tbody><tr><td>ROM Disabled<\/td><td>Australia<\/td><td>*<\/td><\/tr><tr><td>ROM Activated<\/td><td>An<\/td><td>*<\/td><\/tr><tr><td>ROM write-protected<\/td><td>*<\/td><td>Australia<\/td><\/tr><tr><td>ROM writable<\/td><td>*<\/td><td>An<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM \u2013 DIP switch ROM settings<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">ROM size<\/h3>\n\n\n\n<p>The small switch allows the ROM size to be set depending on the (E)PROM used.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Description<\/th><th>Switch position<\/th><\/tr><\/thead><tbody><tr><td>8K for ICs 27C64, 28C64B<\/td><td>Above<\/td><\/tr><tr><td>32K for 28C256<\/td><td>Down<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Zusammenbau\"><\/span>Assembly<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Platine\"><\/span>Record<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Description<\/th><th>Worth<\/th><\/tr><\/thead><tbody><tr><td>Gerber available <\/td><td>Yes<\/td><\/tr><tr><td>Gerber file<\/td><td><a href=\"https:\/\/github.com\/monotech\/ISA-DoubleROM\/tree\/master\/gerber\">Link<\/a><\/td><\/tr><tr><td>Ordered where<\/td><td>JLCPCB<\/td><\/tr><tr><td>Piece<\/td><td>10<\/td><\/tr><tr><td>Price<\/td><td>14\u20ac including shipping and taxes in a large package<\/td><\/tr><tr><td>Special features<\/td><td>Lead-free, black<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">PCB order data<\/figcaption><\/figure>\n\n\n\n<p>Here save the Gerber files, please on the <a href=\"https:\/\/github.com\/monotech\/ISA-DoubleROM\">Original page <\/a> according to the current version.<\/p>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-402b469f-d4da-43b7-8265-2232d528dc54\" href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/DoubleROM-1.0.zip\">DoubleROM 1.0<\/a><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/DoubleROM-1.0.zip\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-402b469f-d4da-43b7-8265-2232d528dc54\">Download<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bauteile\"><\/span>Components<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>I ordered the components from various sources.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Component<\/th><th>Size<\/th><th>Number<\/th><th>Description<\/th><th>Price \u20ac<\/th><\/tr><\/thead><tbody><tr><td>74LS688<\/td><td>Dip<\/td><td>2<\/td><td>TTL 8-Bit Comparator<\/td><td>0,68<\/td><\/tr><tr><td>Wide base<\/td><td>28-pin DIP<\/td><td>2<\/td><td>Base, Wide<\/td><td>0,2<\/td><\/tr><tr><td>5 x 10K<\/td><td>6-pin<\/td><td>2<\/td><td>Resistor array<\/td><td>0,2<\/td><\/tr><tr><td>C1, C2 <\/td><td>100nF<\/td><td>2<\/td><td>Ceramic capacitor<\/td><td>0,10<\/td><\/tr><tr><td>South West<\/td><td>2*3 metres<\/td><td>2<\/td><td>Slide switch<\/td><td>0,4<\/td><\/tr><tr><td>Dip SW<\/td><td>12 pins<\/td><td>2<\/td><td>6 x Dip Switch<\/td><td>0,4<\/td><\/tr><tr><td>C3<\/td><td>10 microfarads<\/td><td>1<\/td><td>Electrolytic capacitor<\/td><td>0,2<\/td><\/tr><\/tbody><tfoot><tr><td><\/td><td><\/td><td><\/td><td>Summer<\/td><td>2,18\u20ac<\/td><\/tr><\/tfoot><\/table><figcaption class=\"wp-element-caption\">Bill of materials<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Aufbau\"><\/span>Structure<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Varianten\"><\/span>Variations<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Reihenfolge\"><\/span>Order<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"699\" data-id=\"13422\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_141855-2-1024x699.jpg\" alt=\"\" class=\"wp-image-13422\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_141855-2-1024x699.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_141855-2-300x205.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_141855-2-768x525.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_141855-2-1536x1049.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_141855-2-2048x1399.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM fitting \u2013 First, both 74688 ICs without sockets <\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"697\" data-id=\"13427\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_143802-2-1024x697.jpg\" alt=\"\" class=\"wp-image-13427\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_143802-2-1024x697.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_143802-2-300x204.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_143802-2-768x523.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_143802-2-1536x1046.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_143802-2-2048x1395.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM fitting \u2013 32-pin socket for EPROMs<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"715\" data-id=\"13421\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_152657-2-1024x715.jpg\" alt=\"\" class=\"wp-image-13421\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_152657-2-1024x715.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_152657-2-300x209.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_152657-2-768x536.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_152657-2-1536x1072.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_152657-2-2048x1429.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM population \u2013 Capacitors and resistor array<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"709\" data-id=\"13424\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_153240-2-1024x709.jpg\" alt=\"\" class=\"wp-image-13424\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_153240-2-1024x709.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_153240-2-300x208.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_153240-2-768x532.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_153240-2-1536x1064.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250414_153240-2-2048x1419.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM Assembly \u2013 DIP Switches<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"710\" data-id=\"13213\" src=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-1024x710.jpg\" alt=\"\" class=\"wp-image-13213\" srcset=\"https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-1024x710.jpg 1024w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-300x208.jpg 300w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-768x533.jpg 768w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-1536x1066.jpg 1536w, https:\/\/www.fambach.net\/wp-content\/uploads\/20250415_190608-2048x1421.jpg 2048w\" sizes=\"(max-width: 599px) calc(100vw - 50px), (max-width: 767px) calc(100vw - 70px), (max-width: 991px) 429px, (max-width: 1199px) 637px, 354px\" \/><\/a><figcaption class=\"wp-element-caption\">Monotech ISA DoubleROM population \u2013 switches, electrolytic capacitor (I omitted)<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<ul>\n<li><\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inbetriebnahme\"><\/span>Commissioning<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>Connect the ROM, set the address, insert the ISA card correctly into the SLOT and hope that the ROM becomes visible on boot. For troubleshooting with XTIDE, I've already written something in the following article.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-stefan-039-s-webblog wp-block-embed-stefan-039-s-webblog\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"x9yOtzJSPQ\"><a href=\"https:\/\/www.fambach.net\/en\/retro-xt-ide-bios\/\">Retro \u2013 XT-IDE (BIOS)<\/a><\/blockquote><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"\u201eRetro \u2013 XT-IDE (BIOS)\u201c \u2014 Stefan&#039;s WebBlog\" src=\"https:\/\/www.fambach.net\/retro-xt-ide-bios\/embed\/#?secret=X0sPPrdNwq#?secret=x9yOtzJSPQ\" data-secret=\"x9yOtzJSPQ\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Floppy BIOS<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/github.com\/skiselev\/floppy_bios\">https:\/\/github.com\/skiselev\/floppy_bios<\/a><br><strong>Post:<\/strong> <a href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-retro-projekt-floppy-disk-controller-isa-fdc\/(\u00f6ffnet in neuem Tab)\/\">https:\/\/www.fambach.net\/retro_pojekt-retro-projekt-floppy-disk-controller-isa-fdc\/<\/a> <\/p>\n\n\n\n<p>A BIOS for operating up to 8 floppy drives from 160KB to 2.88MB.<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>Up to 8 floppy drives<\/li>\n\n\n\n<li>5 1\/4 and 3 1\/2 inch support<\/li>\n\n\n\n<li>Up to two controllers<\/li>\n\n\n\n<li>Own BIOS functions for configuration<\/li>\n\n\n\n<li>100% IBM PC XT\/AT compatible<\/li>\n\n\n\n<li>...<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong> \u2013<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">XTIDE Universal BIOS<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/xtideuniversalbios.org\">https:\/\/xtideuniversalbios.org<\/a><br><strong>Post:<\/strong> <a href=\"https:\/\/www.fambach.net\/en\/retro-xt-ide-bios\/\">https:\/\/www.fambach.net\/retro-xt-ide-bios\/<\/a><\/p>\n\n\n\n<p>Enables new and large hard drives to be operated on old hardware.<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>Up to 4 hard drives<\/li>\n\n\n\n<li>Up to 2 controllers<\/li>\n\n\n\n<li>Configuration software<\/li>\n\n\n\n<li>Boot menu for starting from floppy disk or other sources<\/li>\n\n\n\n<li>100% IBM PC XT\/AT compatible<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong> \u2013<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Roman<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/rayer.g6.cz\/romos\/romose.htm\">https:\/\/rayer.g6.cz\/romos\/romose.htm<\/a><br><strong>Post:<\/strong> <a href=\"https:\/\/www.fambach.net\/wp-admin\/post.php?post=12663&amp;action=edit\">https:\/\/www.fambach.net\/wp-admin\/post.php?post=12663&amp;action=edit<\/a> <\/p>\n\n\n\n<p>Free-DOS on a ROM<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>DOS OS on the ROM<\/li>\n\n\n\n<li>For drive-less operation of PCs<\/li>\n\n\n\n<li>Space for your own programmes<\/li>\n\n\n\n<li>Detailed \u201eAssembly Instructions\u201c<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong> \u2013<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Supersoft\/Landmark Diagnostic ROM<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/www.minuszerodegrees.net\/supersoft_landmark\/Supersoft%20Landmark%20ROM.htm\">Supersoft Landmark XT<\/a> (No original link, leads to MinusZeroDegree)<br><strong>Post:<\/strong> \u2013<\/p>\n\n\n\n<p>Diagnose BIOS to find an error. Used when an XT board is not functioning, but there are no short circuits and a good power supply. (Source: <a href=\"https:\/\/www.minuszerodegrees.net\/\">https:\/\/www.minuszerodegrees.net\/<\/a>)<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>No RAM error support<\/li>\n\n\n\n<li>XT Compatible<\/li>\n\n\n\n<li>CGA, MDA\/MGA support<\/li>\n\n\n\n<li>EGA is poorly supported<\/li>\n\n\n\n<li>Only a few VGA cards work.<\/li>\n\n\n\n<li>Different BIOS versions for different XT versions<\/li>\n\n\n\n<li>27256 ROM Required (e.g. 27C256)<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/www.minuszerodegrees.net\/supersoft_landmark\/Supersoft%20Landmark%20ROM%20-%20Version%201.2%20-%20Users%20Manual.pdf\">User manual<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Supersoft\/Landmark Diagnostic ROM (AT Version)<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/www.minuszerodegrees.net\/supersoft_landmark\/Clones\/Supersoft%20Landmark%20ROM%20-%20AT%20clones.htm\">Supersoft Landmark AT Clone<\/a> (No original link, leads to MinusZeroDegree)<br><strong>Post:<\/strong> \u2013<\/p>\n\n\n\n<p>BIOS diagnostics for AT mainboards. Not suitable for finding memory errors.<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>No RAM error support<\/li>\n\n\n\n<li>AT Compatible<\/li>\n\n\n\n<li>Not all CGA, MDA\/MGA, EGA cards are supported<\/li>\n\n\n\n<li>None of the tested VGA cards are working.<a href=\"https:\/\/www.minuszerodegrees.net\/supersoft_landmark\/Supersoft%20Landmark%20ROM%20-%20VGA%20cards.htm\">Minus Zero Degrees<\/a>)<\/li>\n\n\n\n<li>Various BIOS images for different ROMs<\/li>\n\n\n\n<li>Supports 27256 \/ 27512 ROMs (For example 27C256, 27C512)<\/li>\n\n\n\n<li>W27E257 EEProm supported<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong> \u2013<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ruud's Diagnostic ROM<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/www.minuszerodegrees.net\/ruuds_diagnostic_rom\/Ruuds%20Diagnostic%20ROM.htm\">https:\/\/www.minuszerodegrees.net\/ruuds_diagnostic_rom\/Ruuds%20Diagnostic%20ROM.htm<\/a><br><strong>Post:<\/strong> \u2013<\/p>\n\n\n\n<p>ROMs for XT and clones<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>Versions with CGA\/MDA output and without<\/li>\n\n\n\n<li>XT 5150, 5155, 5160, Klone<\/li>\n\n\n\n<li>RAM, CPU, Interrupt Test<\/li>\n\n\n\n<li>Keyboard Reset\/Stuck Key Test<\/li>\n\n\n\n<li>Floppy Controller \/ Read Test<\/li>\n\n\n\n<li>Rom F4000, F6000, F8000, FA000, FC000 8-Bit Checksum Test<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong> \u2013<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">X Ram Rest<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <strong><a href=\"https:\/\/github.com\/ki3v\/xtramtest\">Extratest<\/a><\/strong><br><strong><strong>Post:<\/strong><\/strong><\/p>\n\n\n\n<p>RAM test on a ROM, good if the normal BIOS refuses to work.<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>Test of bit patterns and address\/data bus<\/li>\n\n\n\n<li>March-U Algorithms<\/li>\n\n\n\n<li>No parity RAM test.<\/li>\n\n\n\n<li>PC\/XT Clone Support (5150, 5160)<\/li>\n\n\n\n<li>Different ROM images for different ROM sizes<\/li>\n\n\n\n<li>2764\/2864\/27256\/28256 Support<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">IBM ROM Basic<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/www.ardent-tool.com\/tech\/ROM_BASIC.html\">https:\/\/www.ardent-tool.com\/tech\/ROM_BASIC.html<\/a><br><strong>Post:<\/strong> \u2013<\/p>\n\n\n\n<p>IBM Basic, which was delivered with the 5150, 5160, 5170... machines. This made it possible to start the XT PC in Basic mode. This ROM was also referred to as Cassette Basic because no diskettes were needed for it.<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>XT compatible<\/li>\n\n\n\n<li>Commercial product \u2013 but seems to be available without licensing<\/li>\n\n\n\n<li>Complete Basic interpreter<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong> \u2013<\/p>\n\n\n\n<p><a href=\"https:\/\/www.pcjs.org\/machines\/pcx86\/ibm\/5150\/rom\/basic\">https:\/\/www.pcjs.org\/machines\/pcx86\/ibm\/5150\/rom\/basic<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/jeffpar\/pcjs\/tree\/gh-pages\/machines\/pcx86\/ibm\/5150\/rom\/basic\/\">https:\/\/github.com\/jeffpar\/pcjs\/tree\/gh-pages\/machines\/pcx86\/ibm\/5150\/rom\/basic\/<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/jeffpar\/pcjs\/tree\/gh-pages\/machines\/pcx86\/ibm\/5160\/rom\/basic\">https:\/\/github.com\/jeffpar\/pcjs\/tree\/gh-pages\/machines\/pcx86\/ibm\/5160\/rom\/basic<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">GLaDOS<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/github.com\/640-KB\/GLaBIOS\">https:\/\/github.com\/640-KB\/GLaBIOS<\/a><br><strong>Post:<\/strong> \u2013<\/p>\n\n\n\n<p>Newly written minimal BIOS for XT 8088. <\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>Advanced, coloured postscreen<\/li>\n\n\n\n<li>Quick<\/li>\n\n\n\n<li>5150 Dataset Support<\/li>\n\n\n\n<li>V20 instruction set support<\/li>\n\n\n\n<li>CGA snow removed<\/li>\n\n\n\n<li>...<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong> \u2013<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">V40 BIOS<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"https:\/\/gitlab.com\/hakfoo1\/v40-bios\">https:\/\/gitlab.com\/hakfoo1\/v40-bios<\/a><br><strong>Post:<\/strong> \u2013<\/p>\n\n\n\n<p>This BIOS is a revision of an old BIOS and adds CH375 support. This allows with the correct hardware (for example <a href=\"https:\/\/www.lo-tech.co.uk\/product\/isa-usb-adapter\/\">https:\/\/www.lo-tech.co.uk\/product\/isa-usb-adapter\/<\/a>), to operate and even boot from USB sticks.<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>Does the CH375 allow controlled USB stick addressing?<\/li>\n\n\n\n<li>The number of floppies must be set when compiling<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ROMDOS<\/h2>\n\n\n\n<p>Source: <a href=\"https:\/\/ftp.emacinc.com\/Tech_Info\/ROMDOS\/ROM-DOS_Users_Guide.pdf\">https:\/\/ftp.emacinc.com\/Tech_Info\/ROMDOS\/ROM-DOS_Users_Guide.pdf<\/a><\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>DOS 6.22 on ROM <\/li>\n\n\n\n<li>Commercial Product (Licensed)<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/archiveos.org\/rom-dos\">https:\/\/archiveos.org\/rom-dos<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/shop.emacinc.com\/ms-dos\">https:\/\/shop.emacinc.com\/ms-dos<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Super PC\/Turbo XT BIOS 3.1<\/h2>\n\n\n\n<p><strong>Source:<\/strong> <a href=\"http:\/\/www.phatcode.net\/\">http:\/\/www.phatcode.net\/<\/a><br><strong>Post:<\/strong> \u2013<\/p>\n\n\n\n<p><strong>Facts:<\/strong><\/p>\n\n\n\n<ul>\n<li>Modified version of the anonymous generic Turbo BIOS <\/li>\n\n\n\n<li>Compatible with IBM 5150\/5155\/5160\u00a0<\/li>\n\n\n\n<li>Also for 8\/10 MHz turbo systems<\/li>\n\n\n\n<li>Bug fixed<\/li>\n<\/ul>\n\n\n\n<p><strong>Further sources:<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/virtualxt\/pcxtbios\/tree\/master\">https:\/\/github.com\/virtualxt\/pcxtbios\/tree\/master<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sonstiges\"><\/span>Miscellaneous<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Generelle_Tips\"><\/span>General Tips<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lotstellen\"><\/span>Soldering points<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Check the solder joints on the ICs again carefully, preferably with a microscope or magnifying glass, for short circuits and contact. Measure with a multimeter or continuity tester.<\/p>\n\n\n\n<p>For small solder joints on through-hole components, use flux if possible; it makes life easier and increases the quality of the connection.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Probleme\"><\/span>Problems<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fazit\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Description<\/th><th>Worth<\/th><\/tr><\/thead><tbody><tr><td>Successful<\/td><td>Yes \/ No<\/td><\/tr><tr><td>Price per piece<\/td><td>~3 \u20ac<\/td><\/tr><tr><td>Soldering time<\/td><td>Half an hour<\/td><\/tr><tr><td>Function<\/td><td>Gut<\/td><\/tr><tr><td>Is it worth it<\/td><td>? \u2013 Good question, apart from XT-IDE, I don't currently have an application, but it's not bad to be able to run two ROMs in parallel \ud83d\ude09 <\/td><\/tr><tr><td>Restrictions<\/td><td>Is limited to the 3 (E)PROM types 27C64 (read-only), 28C64B, 28C256<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Conclusion to the project<\/figcaption><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Verwandte_Beitrage\"><\/span>Related Posts<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n<ul class=\"display-posts-listing\">\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-isa-8bit-backplane\/\">Retro Project - ISA 8-Bit Backplane<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-voltage-blaster\/\">Retro Project \u2013 Voltage Blaster<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-8bit-isa-ethernet-card-isa8_eth\/\">Retro Project \u2013 8-Bit ISA Ethernet Card (isa8_eth)<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro-projekt-fdc-usb-floppy-controller\/\">Retro Project \u2013 FDC USB Floppy Disk Controller<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-retro-projekt-floppy-disk-controller-isa-fdc\/\">Retro Project \u2013 Floppy Disk Controller (isa-fdc)<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-6\/\">Retro Project \u2013 ROMOS<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-usb-auf-rs232-mouse-adapter\/\">Retro Project \u2013 USB to RS232 Mouse Adapter<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-retro-projekt-monotech-isa-doublerom\/\">Retro Project \u2013 Monotech ISA Double ROM<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-4\/\">Retro Project - Greaseweazle 4.1<\/a><\/li>\n<li class=\"listing-item\"><a class=\"title\" href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/\">Retro Project \u2013 ATX Form Card<\/a><\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quellen\"><\/span>Sources<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Zum_Projekt\"><\/span>To the project<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/github.com\/monotech\/ISA-DoubleROM\">GitHub Link<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/LimeProgramming\/USB-serial-mouse-adapter\">Parts list<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/monotech\/ISA-DoubleROM\/tree\/master\/gerber\">Gerber files<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/skiselev\/floppy_bios\">https:\/\/github.com\/skiselev\/floppy_bios<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Retro_Seiten\"><\/span>Retro pages<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/archive.org\">https:\/\/archive.org<\/a> \u2013 Old software, magazines, manuals, and much more.<\/p>\n\n\n\n<p><a href=\"https:\/\/theretroweb.com\">https:\/\/theretroweb.com<\/a> \u2013 PC Hardware Directory.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.winhistory.de\/index.php\">https:\/\/www.winhistory.de\/index.php<\/a> \u2013 DOS, Windows Version Descriptions.<\/p>\n\n\n\n<p>Win 3.1x Tools and Tricks<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Retro_Foren\"><\/span>Retro Forensics<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/forum.classic-computing.de\/forum\">https:\/\/forum.classic-computing.de\/forum<\/a> \u2013 German\/English forum with many retro computer enthusiasts.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.vogons.org\">https:\/\/www.vogons.org<\/a> \u2013 I have found many tips on hardware here, they also have a driver directory.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.dosforum.de\">https:\/\/www.dosforum.de<\/a> \u2013 Forum with strict rules and very helpful regarding DOS, Windows questions are not welcome.<\/p>\n\n\n\n<p><a href=\"https:\/\/dosreloaded.de\">https:\/\/dosreloaded.de<\/a> \u2013 DOS, hardware repairs, BIOS files and more.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.winhistory-forum.net\">https:\/\/www.winhistory-forum.net<\/a> DOS and Windows history.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Retro_Shops\"><\/span>Retro Shops<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/ram-co-shop.de\">https:\/\/ram-co-shop.de<\/a> - PC parts, including newer ones, have ordered a lot from there and it's always worked.<\/p>\n\n\n\n<p><a href=\"http:\/\/www.amoretro.de\/\">http:\/\/www.amoretro.de<\/a> \u2013 Sold on eBay and has a nice directory of old hardware<\/p>\n\n\n\n<p><a href=\"https:\/\/retroreiz.de\">https:\/\/retroreiz.de<\/a> \u2013 Atari, Nintendo, Sega and others.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.retroworld.info\/de\">https:\/\/www.retroworld.info\/de<\/a> \u2013 Stickers, signs and more.<\/p>\n\n\n\n<p><a href=\"https:\/\/retesa-nb.de\">https:\/\/retesa-nb.de<\/a> \u2013 Older PC hardware<\/p>\n\n\n\n<p><a href=\"https:\/\/www.retro8bitshop.com\">https:\/\/www.retro8bitshop.com<\/a> \u2013 C64 tricky<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Logbuch\"><\/span>Logbook<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Date<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>08.03.2025<\/td><td>Post Created<\/td><\/tr><tr><td>06.07.2025<\/td><td>Post finalized<\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Revision history<\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Why take a card with just one ROM when you can get one that has two? That's exactly what the developers at Monotech probably thought, and they've laid out a Double ROM card, and even better, they've made the hardware open source. So, if you don't want to tinker yourself, you can get here\u2026<\/p>\n<a href=\"https:\/\/www.fambach.net\/en\/retro_pojekt-template-3\/\" class=\"read-more-link\">Carry on reading <span class=\"screen-reader-text\">\"Retro Projekt &#8211; ATX Form Card\"<\/span> <span class=\"meta-nav\">\u2192<\/span><\/a>","protected":false},"author":1,"featured_media":13950,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[821,885],"tags":[901,884,811,899],"modified_by":"sfambach","_links":{"self":[{"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/posts\/13208"}],"collection":[{"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/comments?post=13208"}],"version-history":[{"count":23,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/posts\/13208\/revisions"}],"predecessor-version":[{"id":15399,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/posts\/13208\/revisions\/15399"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/media\/13950"}],"wp:attachment":[{"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/media?parent=13208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/categories?post=13208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fambach.net\/en\/wp-json\/wp\/v2\/tags?post=13208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}