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1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" 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12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 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Link--secondary" data-analytics-event="{"location":"navbar","action":"view_all_industries","context":"solutions","tag":"link","label":"view_all_industries_link_solutions_navbar"}" href="/solutions/industry"> View all industries </a></li> </ul> </div> </div> <div class="HeaderMenu-trailing-link rounded-bottom-2 flex-shrink-0 mt-lg-4 px-lg-4 py-4 py-lg-3 f5 text-semibold"> <a href="/solutions"> View all solutions <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-right HeaderMenu-trailing-link-icon"> <path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path> </svg> </a> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Resources <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span> <ul 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data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"executive_insights","context":"resources","tag":"link","label":"executive_insights_link_resources_navbar"}" href="https://github.com/solutions/executive-insights"> Executive Insights </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Open Source <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> Fund open source developers </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"the_readme_project","context":"open_source","tag":"link","label":"the_readme_project_link_open_source_navbar"}" href="https://github.com/readme"> <div> <div class="color-fg-default h4">The ReadME Project</div> GitHub community articles </div> </a></li> </ul> </div> <div class="border-bottom pb-3 pb-lg-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="open-source-repositories-heading">Repositories</span> <ul class="list-style-none f5" aria-labelledby="open-source-repositories-heading"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"topics","context":"open_source","tag":"link","label":"topics_link_open_source_navbar"}" href="https://github.com/topics"> Topics </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"trending","context":"open_source","tag":"link","label":"trending_link_open_source_navbar"}" href="https://github.com/trending"> Trending </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" 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value="YGsPXa2WoODdQn6ccRTo5lITvZdt5C99cxOzSzYxSe54F6v52uAdbj/r9te4D+lfMyJePk+mOi/g/QCAbsVUiQ==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" id="custom_scope_id" name="custom_scope_id" data-target="custom-scopes.customScopesIdField"> <div class="form-group"> <label for="custom_scope_name">Name</label> <auto-check src="/search/custom_scopes/check_name" required only-validate-on-blur="false"> <input type="text" name="custom_scope_name" id="custom_scope_name" data-target="custom-scopes.customScopesNameField" class="form-control" autocomplete="off" placeholder="github-ruby" required maxlength="50"> <input type="hidden" data-csrf="true" value="4wCu/99fFPIgJD8bhGGLPSsWx1vC+TxFsrdu19mHfM90VgHAB5vDdVFTiMIFEJodjxEWVDzUz9OQRcHWeoOekw==" /> </auto-check> </div> <div class="form-group"> <label for="custom_scope_query">Query</label> <input type="text" name="custom_scope_query" id="custom_scope_query" data-target="custom-scopes.customScopesQueryField" 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class=\"heading-element\" dir=\"auto\"\u003ePico Micro Mac (pico-umac)\u003c/h1\u003e\u003ca id=\"user-content-pico-micro-mac-pico-umac\" class=\"anchor\" aria-label=\"Permalink: Pico Micro Mac (pico-umac)\" href=\"#pico-micro-mac-pico-umac\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ev0.21-fruitjam 22 March 2025\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI (@jepler) have run roughshod across the code, breaking things willy-nilly and adding\n* 512x342 \u0026amp; 640x480 digital output on HSTX\n* PIO USB\n* PSRAM support\n* Some Sound support\n* To enable that, some VIA timer 2 support\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe two main variants offered are the \"400kB\" mac with a 640x480 resolution \u0026amp; a\n4MB mac with 512x342 resolution (presented centered on a 640x480 display).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor now, I2S is on pins A1 (data) A2 (LRCK) A3 (bit clock). With any luck it'll be moved to the on-board I2S soon.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhat works?\n* System beep\n* A fair amount of hypercard, though not playing melodies with 'play \"Boing\" \"a b c\"'\n* Hypercard 'play \"Boing\"' does play audio though (as does 'beep')\n* Dark Castle including audio\n* After Dark screensavers including audio\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhat almost works\n* Glider was working, but my sound changes made it boot with an error about missing coprocessor?? (appears linked to the timer2 implementation)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere are artifacts that you can grab from the latest Actions build, at least until they expire.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSome good Mac software:\n* \u003ca href=\"https://archive.org/details/HyperCardBootSystem7\" rel=\"nofollow\"\u003ehttps://archive.org/details/HyperCardBootSystem7\u003c/a\u003e\n* \u003ca href=\"https://archive.org/details/mac_DarkCastle_1_2\" rel=\"nofollow\"\u003ehttps://archive.org/details/mac_DarkCastle_1_2\u003c/a\u003e\n* \u003ca href=\"https://archive.org/details/AfterDark2\" rel=\"nofollow\"\u003ehttps://archive.org/details/AfterDark2\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ev0.21 20 December 2024\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis project embeds the \u003ca href=\"https://github.com/evansm7/umac\"\u003eumac Mac 128K\nemulator\u003c/a\u003e project into a Raspberry Pi\nPico microcontroller. At long last, the worst Macintosh in a cheap,\nportable form factor!\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt has features, many features, the best features:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eOutputs VGA 640x480@60Hz, monochrome, using three resistors\u003c/li\u003e\n\u003cli\u003eUSB HID keyboard and mouse\u003c/li\u003e\n\u003cli\u003eRead-only disc image in flash (your creations are ephemeral, like life itself)\u003c/li\u003e\n\u003cli\u003eOr, if you have a hard time letting go, support for rewritable\ndisc storage on an SPI-attached SD card\u003c/li\u003e\n\u003cli\u003eMac 128K by default, or you can make use of more of the Pico's\nmemory and run as a \u003cem\u003eMac 208K\u003c/em\u003e\u003c/li\u003e\n\u003cli\u003eSince you now have more memory, you can splash out on more\nscreen real-estate, and use 640x480 resolution!\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eGreat features. It even doesn't hang at random! (Anymore.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003cem\u003eMac 208K\u003c/em\u003e was, of course, never a real machine. But, \u003cem\u003eumac\u003c/em\u003e\nsupports odd-sized memories, and more memory runs more things. A\nsurprising amount of software runs on the 128K config, but if you need\nto run \u003cem\u003eMacPaint\u003c/em\u003e specifically then you'll need to build both SD\nstorage in addition to the \u003cem\u003eMac 208K\u003c/em\u003e config.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo anyway, you can build this project yourself for less than the cost\nof a beer! You'll need at least a RPi Pico board, a VGA monitor (or\nVGA-HDMI adapter), a USB mouse (and maybe a USB keyboard/hub), plus a\ncouple of cheap components.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuild\u003c/h1\u003e\u003ca id=\"user-content-build\" class=\"anchor\" aria-label=\"Permalink: Build\" href=\"#build\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrerequisites/essentials\u003c/h2\u003e\u003ca id=\"user-content-prerequisitesessentials\" class=\"anchor\" aria-label=\"Permalink: Prerequisites/essentials\" href=\"#prerequisitesessentials\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003egit submodules\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eClone the repo with \u003ccode\u003e--recursive\u003c/code\u003e, or \u003ccode\u003egit submodule update --init --recursive\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eInstall/set up the \u003ca href=\"https://github.com/raspberrypi/pico-sdk\"\u003ePico/RP2040 SDK\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuild umac\u003c/h2\u003e\u003ca id=\"user-content-build-umac\" class=\"anchor\" aria-label=\"Permalink: Build umac\" href=\"#build-umac\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eInstall and build \u003ccode\u003eumac\u003c/code\u003e first. It'll give you a preview of the fun\nto come, plus is required to generate a patched ROM image.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you want to use a non-default memory size (i.e. \u0026gt;128K) you will\nneed to build \u003ccode\u003eumac\u003c/code\u003e with a matching \u003ccode\u003eMEMSIZE\u003c/code\u003e build parameter, for\nexample:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"cd external/umac\nmake MEMSIZE=208\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ecd external/umac\nmake MEMSIZE=208\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is because \u003ccode\u003eumac\u003c/code\u003e is used to patch the ROM, and when using\nunsupported sizes between 128K and 512K the RAM size can't be probed\nautomatically, so the size needs to be embedded.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis is also the case for altering the video resolution, because the ROM\nmust be patched for this. Build \u003ccode\u003eumac\u003c/code\u003e with \u003ccode\u003eDISP_WIDTH=640 DISP_HEIGHT=480\u003c/code\u003e\nwhen you intend to use the \u003ccode\u003eUSE_VGA_RES\u003c/code\u003e option. For example:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"cd external/umac\nmake MEMSIZE=208 DISP_WIDTH=640 DISP_HEIGHT=480\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ecd external/umac\nmake MEMSIZE=208 DISP_WIDTH=640 DISP_HEIGHT=480\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuild pico-umac\u003c/h2\u003e\u003ca id=\"user-content-build-pico-umac\" class=\"anchor\" aria-label=\"Permalink: Build pico-umac\" href=\"#build-pico-umac\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eDo the initial Pico SDK \u003ccode\u003ecmake\u003c/code\u003e setup into an out-of-tree build dir,\nproviding config options if required.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFrom the top-level \u003ccode\u003epico-umac\u003c/code\u003e directory:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"mkdir build\n(cd build ; PICO_SDK_PATH=/path/to/sdk cmake .. \u0026lt;options\u0026gt;)\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003emkdir build\n(cd build ; PICO_SDK_PATH=/path/to/sdk cmake .. \u0026lt;options\u0026gt;)\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOptions are required if you want SD support, more than the default 128K of memory,\nhigher resolution, to change pin configs, etc.:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003e-DUSE_SD=true\u003c/code\u003e: Include SD card support. The GPIOs default to\n\u003ccode\u003espi0\u003c/code\u003e running at 5MHz, and GPIOs 2,3,4,5 for\n\u003ccode\u003eSCK\u003c/code\u003e/\u003ccode\u003eTX\u003c/code\u003e/\u003ccode\u003eRX\u003c/code\u003e/\u003ccode\u003eCS\u003c/code\u003e respectively. These can be overridden for\nyour board/setup:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003e-DSD_TX=\u0026lt;gpio pin\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e-DSD_RX=\u0026lt;gpio pin\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e-DSD_SCK=\u0026lt;gpio pin\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e-DSD_CS=\u0026lt;gpio pin\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e-DSD_MHZ=\u0026lt;integer speed in MHz\u0026gt;\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e-DMEMSIZE=\u0026lt;size in KB\u0026gt;\u003c/code\u003e: The maximum practical size is about\n208KB, but values between 128 and 208 should work on a RP2040.\nNote that although apps and Mac OS seem to gracefully detect free\nmemory, these products never existed and some apps might behave\nstrangely.\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eWith the \u003ccode\u003eMac Plus\u003c/code\u003e ROM, a \u003cem\u003eMac 128K\u003c/em\u003e doesn't quite have\nenough memory to run \u003cem\u003eMacPaint\u003c/em\u003e. So, 192 or 208 (and a\nwriteable boot volume on SD) will allow \u003cem\u003eMacPaint\u003c/em\u003e to run.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eNOTE\u003c/strong\u003e: When this option is used, the ROM image must be\nbuilt with an \u003ccode\u003eumac\u003c/code\u003e build with a corresponding \u003ccode\u003eMEMSIZE\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e-DUSE_VGA_RES=1\u003c/code\u003e: Use 640x480 screen resolution instead of the\nnative 512x342. This uses an additional 16KB of RAM, so this\noption makes a \u003cem\u003eMac 128K\u003c/em\u003e configuration virtually unusable.\nIt is recommended only to use this when configuring \u0026gt;208K\nusing the option above.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003e-DVIDEO_PIN=\u0026lt;GPIO pin\u0026gt;\u003c/code\u003e: Move the video output pins; defaults\nto the pinout shown below.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eTip: \u003ccode\u003ecmake\u003c/code\u003e caches these variables, so if you see weird behaviour\nhaving built previously and then changed an option, delete the \u003ccode\u003ebuild\u003c/code\u003e\ndirectory and start again.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eROM image\u003c/h2\u003e\u003ca id=\"user-content-rom-image\" class=\"anchor\" aria-label=\"Permalink: ROM image\" href=\"#rom-image\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe flow is to use \u003ccode\u003eumac\u003c/code\u003e built on your workstation (e.g. Linux,\nbut WSL may work too) to prepare a patched ROM image.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eumac\u003c/code\u003e is passed the 4D1F8172 MacPlusv3 ROM, and \u003ccode\u003e-W\u003c/code\u003e to write the\npost-patching binary out:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"./external/umac/main -r '4D1F8172 - MacPlus v3.ROM' -W rom.bin\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e./external/umac/main -r '4D1F8172 - MacPlus v3.ROM' -W rom.bin\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote: Again, remember that if you are using the \u003ccode\u003e-DMEMSIZE\u003c/code\u003e option to\nincrease the \u003ccode\u003epico-umac\u003c/code\u003e memory, or the \u003ccode\u003e-DUSE_VGA_RES\u003c/code\u003e option to\nincrease the \u003ccode\u003epico-umac\u003c/code\u003e screen resolution, you will need to create\nthis ROM image with a \u003ccode\u003eumac\u003c/code\u003e built with the corresponding\n\u003ccode\u003eMEMSIZE\u003c/code\u003e/\u003ccode\u003eDISP_WIDTH\u003c/code\u003e/\u003ccode\u003eDISP_HEIGHT\u003c/code\u003e options, as above.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDisc image\u003c/h2\u003e\u003ca id=\"user-content-disc-image\" class=\"anchor\" aria-label=\"Permalink: Disc image\" href=\"#disc-image\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you don't build SD support, an internal read-only disc image is\nstored in flash. If you do build SD support, you have the option to\nstill include an image in flash, and this is used as a fallback if\nSD boot fails.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eGrab a Macintosh system disc from somewhere. A 400K or 800K floppy\nimage works just fine, up to System 3.2 (the last version to support\nMac128Ks). I've used images from\n\u003ca href=\"https://winworldpc.com/product/mac-os-0-6/system-3x\" rel=\"nofollow\"\u003ehttps://winworldpc.com/product/mac-os-0-6/system-3x\u003c/a\u003e but also check\nthe various forums and MacintoshRepository. See the \u003ccode\u003eumac\u003c/code\u003e README for\ninfo on formats (it needs to be raw data without header).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe image size can be whatever you have space for in flash (typically\nabout 1.3MB is free there), or on the SD card. (I don't know what the\nHFS limits are. But if you make a 50MB disc you're unlikely to fill\nit with software that actually works on the \u003cem\u003eMac 128K\u003c/em\u003e :) )\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf using an SD card, use a FAT-formatted card and copy your disc image\ninto \u003cem\u003eone\u003c/em\u003e of the following files in the root of the card:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eumac0.img\u003c/code\u003e: A normal read/write disc image\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eumac0ro.img\u003c/code\u003e: A read-only disc image\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePutting it together, and building\u003c/h2\u003e\u003ca id=\"user-content-putting-it-together-and-building\" class=\"anchor\" aria-label=\"Permalink: Putting it together, and building\" href=\"#putting-it-together-and-building\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eGiven the \u003ccode\u003erom.bin\u003c/code\u003e prepared above and a \u003ccode\u003edisc.bin\u003c/code\u003e destinated for\nflash, you can now generate includes from them and perform the build:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"mkdir incbin\nxxd -i \u0026lt; rom.bin \u0026gt; incbin/umac-rom.h\n\n# When using an internal disc image:\nxxd -i \u0026lt; disc.bin \u0026gt; incbin/umac-disc.h\n# OR, if using SD and if you do _not_ want an internal image:\necho \u0026gt; incbin/umac-disc.h\n\nmake -C build\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003emkdir incbin\nxxd -i \u0026lt; rom.bin \u0026gt; incbin/umac-rom.h\n\n# When using an internal disc image:\nxxd -i \u0026lt; disc.bin \u0026gt; incbin/umac-disc.h\n# OR, if using SD and if you do _not_ want an internal image:\necho \u0026gt; incbin/umac-disc.h\n\nmake -C build\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou'll get a \u003ccode\u003ebuild/firmware.uf2\u003c/code\u003e out the other end. Flash this to\nyour Pico: e.g. plug it in with button held/drag/drop. (When\niterating/testing during development, unplugging the OTG cable each\ntime is a pain – I ended up moving to SWD probe programming.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe LED should flash at about 2Hz once powered up.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHardware contruction\u003c/h1\u003e\u003ca id=\"user-content-hardware-contruction\" class=\"anchor\" aria-label=\"Permalink: Hardware contruction\" href=\"#hardware-contruction\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt's a simple circuit in terms of having few components: just the\nPico, with three series resistors and a VGA connection, and DC power.\nHowever, if you're not comfortable soldering then don't choose this as\nyour first project: I don't want you to zap your mouse, keyboard,\nmonitor, SD cards...\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eDisclaimer: This is a hardware project with zero warranty. All due\ncare has been taken in design/docs, but if you choose to build it then\nI disclaim any responsibility for your hardware or personal safety.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWith that out of the way...\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTheory of operation\u003c/h2\u003e\u003ca id=\"user-content-theory-of-operation\" class=\"anchor\" aria-label=\"Permalink: Theory of operation\" href=\"#theory-of-operation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThree 3.3V GPIO pins are driven by PIO to give VSYNC, HSYNC, and video\nout signals.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe syncs are in many similar projects driven directly from GPIO, but\nhere I suggest a 66Ω series resistor on each in order to keep the\nvoltages at the VGA end (presumably into 75Ω termination?) in the\ncorrect range.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor the video output, one GPIO drives R,G,B channels for mono/white\noutput. A 100Ω resistor gives roughly 0.7V (max intensity) into 3*75Ω\nsignals.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThat's it... power in, USB adapter.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePinout and circuit\u003c/h2\u003e\u003ca id=\"user-content-pinout-and-circuit\" class=\"anchor\" aria-label=\"Permalink: Pinout and circuit\" href=\"#pinout-and-circuit\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eParts needed:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ePico/RP2040 board\u003c/li\u003e\n\u003cli\u003eUSB OTG micro-B to A adapter\u003c/li\u003e\n\u003cli\u003eUSB keyboard, mouse (and hub, if not integrated)\u003c/li\u003e\n\u003cli\u003e5V DC supply (600mA+), and maybe a DC jack\u003c/li\u003e\n\u003cli\u003e100Ω resistor\u003c/li\u003e\n\u003cli\u003e2x 66Ω resistors\u003c/li\u003e\n\u003cli\u003eVGA DB15 connector, or janky chopped VGA cable\u003c/li\u003e\n\u003cli\u003e(optional) SD card breakout, SD card\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIf you want to get fancy with an SD card, you will need some kind of\nSD card SPI breakout adapter. (There are a lot of these around, but\nmany seem to have a buffer/level-converter for 5V operation. Find one\nwithout, or modify your adapter for a 3.3V supply. Doing so, and\nfinding an SD card that works well with SPI is out of scope of this\ndoc.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePins are given for a RPi Pico board, but this will work on any RP2040\nboard with 2MB+ flash as long as all required GPIOs are pinned out:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGPIO/pin\u003c/th\u003e\n\u003cth\u003ePico pin\u003c/th\u003e\n\u003cth\u003eUsage\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP0\u003c/td\u003e\n\u003ctd\u003e1\u003c/td\u003e\n\u003ctd\u003eUART0 TX\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP1\u003c/td\u003e\n\u003ctd\u003e2\u003c/td\u003e\n\u003ctd\u003eUART0 RX\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP18\u003c/td\u003e\n\u003ctd\u003e24\u003c/td\u003e\n\u003ctd\u003eVideo output %\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP19\u003c/td\u003e\n\u003ctd\u003e25\u003c/td\u003e\n\u003ctd\u003eVSYNC\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP21\u003c/td\u003e\n\u003ctd\u003e27\u003c/td\u003e\n\u003ctd\u003eHSYNC\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGnd\u003c/td\u003e\n\u003ctd\u003e23, 28\u003c/td\u003e\n\u003ctd\u003eVideo ground\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVBUS (5V)\u003c/td\u003e\n\u003ctd\u003e40\u003c/td\u003e\n\u003ctd\u003e+5V supply\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGnd\u003c/td\u003e\n\u003ctd\u003e38\u003c/td\u003e\n\u003ctd\u003eSupply ground\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003e%: The video pins default here, but can be moved by building with the\n\u003ccode\u003e-DVIDEO_PIN\u003c/code\u003e option. This sets the position of the Video pin,\nwhich is immediately followed by VSYNC, then a gap, then HSYNC.\nFor example, \u003ccode\u003e-DVIDEO_PIN=20\u003c/code\u003e configures the Video pin at 20,\nVSYNC at 21, HSYNC at 23.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMethod:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eWire 5V supply to VBUS/Gnd\u003c/li\u003e\n\u003cli\u003eVideo output --\u0026gt; 100Ω --\u0026gt; VGA RGB (pins 1,2,3) all connected together\u003c/li\u003e\n\u003cli\u003eHSYNC --\u0026gt; 66Ω --\u0026gt; VGA pin 13\u003c/li\u003e\n\u003cli\u003eVSYNC --\u0026gt; 66Ω --\u0026gt; VGA pin 14\u003c/li\u003e\n\u003cli\u003eVideo ground --\u0026gt; VGA grounds (pins 5-8, 10)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIf you don't have exactly 100Ω, using slightly more is OK but display\nwill be dimmer. If you don't have 66Ω for the syncs, connecting them\ndirectly is \"probably OK\", but YMMV.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you are including an SD card, the default pinout is as follows\n(this can be changed at build time, above):\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGPIO/pin\u003c/th\u003e\n\u003cth\u003ePico pin\u003c/th\u003e\n\u003cth\u003eUsage\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP2\u003c/td\u003e\n\u003ctd\u003e4\u003c/td\u003e\n\u003ctd\u003eSPI0 SCK\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP3\u003c/td\u003e\n\u003ctd\u003e5\u003c/td\u003e\n\u003ctd\u003eSPI0 TX (MOSI)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP4\u003c/td\u003e\n\u003ctd\u003e6\u003c/td\u003e\n\u003ctd\u003eSPI0 RX (MISO)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGP5\u003c/td\u003e\n\u003ctd\u003e7\u003c/td\u003e\n\u003ctd\u003eSPI0 /CS\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003e(The SD card needs a good ground, e.g. Pico pin 8 nearby, and 3.3V\nsupply from Pico pin 36.)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf your SD breakout board is \"raw\", i.e. has no buffer or series\nresistors on-board, you may find adding a 66Ω resistor in series on\nall of the four signal lines will help. Supply decoupling caps will\nalso be important (e.g. 1uF+0.1uF) to keep the SD card happy. \u003cem\u003eKeep\nSD card wiring short.\u003c/em\u003e The default SPI clock (5MHz) is\nconservative/slow, but I suggest verifying the circuit/SD card works\nbefore increasing it.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTest your connections: the key part is not getting over 0.7V into your\nVGA connector's signals, or shorting SD card pins.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eConnect USB mouse, and keyboard if you like, and power up.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSoftware\u003c/h1\u003e\u003ca id=\"user-content-software\" class=\"anchor\" aria-label=\"Permalink: Software\" href=\"#software\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBoth CPU cores are used, and are overclocked (blush) to 250MHz so that\nMissile Command is enjoyable to play.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eumac\u003c/code\u003e emulator and video output runs on core 1, and core 0 deals\nwith USB HID input. Video DMA is initialised pointing to the\nframebuffer in the Mac's RAM.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOther than that, it's just a main loop in \u003ccode\u003emain.c\u003c/code\u003e shuffling things\ninto \u003ccode\u003eumac\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eQuite a lot of optimisation has been done in \u003ccode\u003eumac\u003c/code\u003e and \u003ccode\u003eMusashi\u003c/code\u003e to\nget performance up on Cortex-M0+ and the RP2040, like careful location\nof certain routines in RAM, ensuring inlining/constants can be\nfoldeed, etc. It's 5x faster than it was at the beginning.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe top-level project might be a useful framework for other emulators,\nor other projects that need USB HID input and a framebuffer (e.g. a\nVT220 emulator!).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe USB HID code is largely stolen from the TinyUSB example, but shows\nhow in practice you might capture keypresses/deal with mouse events.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eVideo\u003c/h2\u003e\u003ca id=\"user-content-video\" class=\"anchor\" aria-label=\"Permalink: Video\" href=\"#video\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe video system is pretty good and IMHO worth stealing for other\nprojects: It uses one PIO state machine and 3 DMA channels to provide\na rock-solid bitmapped 1BPP 640x480 video output. The Mac 512x342\nframebuffer is centred inside this by using horizontal blanking\nregions (programmed into the line scan-out) and vertical blanking\nareas from a dummy \"always black\" mini-framebuffer.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt supports (at build time) flexible resolutions/timings. The one\ncaveat (or advantage?) is that it uses an HSYNC IRQ routine to\nrecalculate the next DMA buffer pointer; doing this at scan-time costs\nabout 1% of the CPU time (on core 1). However, it could be used to\ngenerate video on-the-fly from characters/tiles without a true\nframebuffer.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI'm considering improvements to the video system:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eSupporting multiple BPP/colour output\u003c/li\u003e\n\u003cli\u003eImplement the rest of \u003ccode\u003eDE\u003c/code\u003e/display valid strobe support, making\ndriving LCDs possible.\u003c/li\u003e\n\u003cli\u003eUsing a video DMA address list and another DMA channel to reduce\nthe IRQ frequency (CPU overhead) to per-frame, at the cost of a\ncouple of KB of RAM.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicence\u003c/h1\u003e\u003ca id=\"user-content-licence\" class=\"anchor\" aria-label=\"Permalink: Licence\" href=\"#licence\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ehid.c\u003c/code\u003e and \u003ccode\u003etusb_config.h\u003c/code\u003e are based on code from the TinyUSB\nproject, which is Copyright (c) 2019, 2021 Ha Thach (tinyusb.org) and\nreleased under the MIT licence. \u003ccode\u003esd_hw_config.c\u003c/code\u003e is based on code\nfrom the no-OS-FatFS-SD-SPI-RPi-Pico project, which is Copyright (c)\n2021 Carl John Kugler III.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe remainder of the code is released under the MIT licence:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCopyright (c) 2024 Matt Evans:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\nSOFTWARE.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Pico Micro Mac (pico-umac)","anchor":"pico-micro-mac-pico-umac","htmlText":"Pico Micro Mac (pico-umac)"},{"level":1,"text":"Build","anchor":"build","htmlText":"Build"},{"level":2,"text":"Prerequisites/essentials","anchor":"prerequisitesessentials","htmlText":"Prerequisites/essentials"},{"level":2,"text":"Build umac","anchor":"build-umac","htmlText":"Build umac"},{"level":2,"text":"Build pico-umac","anchor":"build-pico-umac","htmlText":"Build pico-umac"},{"level":2,"text":"ROM image","anchor":"rom-image","htmlText":"ROM image"},{"level":2,"text":"Disc image","anchor":"disc-image","htmlText":"Disc 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style="vertical-align:text-bottom"><path d="M5.75 2.5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Pico Micro Mac (pico-umac)</h1><a id="user-content-pico-micro-mac-pico-umac" class="anchor" aria-label="Permalink: Pico Micro Mac (pico-umac)" href="#pico-micro-mac-pico-umac"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">v0.21-fruitjam 22 March 2025</p> <p dir="auto">I (@jepler) have run roughshod across the code, breaking things willy-nilly and adding * 512x342 & 640x480 digital output on HSTX * PIO USB * PSRAM support * Some Sound support * To enable that, some VIA timer 2 support</p> <p dir="auto">The two main variants offered are the "400kB" mac with a 640x480 resolution & a 4MB mac with 512x342 resolution (presented centered on a 640x480 display).</p> <p dir="auto">For now, I2S is on pins A1 (data) A2 (LRCK) A3 (bit clock). With any luck it'll be moved to the on-board I2S soon.</p> <p dir="auto">What works? * System beep * A fair amount of hypercard, though not playing melodies with 'play "Boing" "a b c"' * Hypercard 'play "Boing"' does play audio though (as does 'beep') * Dark Castle including audio * After Dark screensavers including audio</p> <p dir="auto">What almost works * Glider was working, but my sound changes made it boot with an error about missing coprocessor?? (appears linked to the timer2 implementation)</p> <p dir="auto">There are artifacts that you can grab from the latest Actions build, at least until they expire.</p> <p dir="auto">Some good Mac software: * <a href="https://archive.org/details/HyperCardBootSystem7" rel="nofollow">https://archive.org/details/HyperCardBootSystem7</a> * <a href="https://archive.org/details/mac_DarkCastle_1_2" rel="nofollow">https://archive.org/details/mac_DarkCastle_1_2</a> * <a href="https://archive.org/details/AfterDark2" rel="nofollow">https://archive.org/details/AfterDark2</a></p> <p dir="auto">v0.21 20 December 2024</p> <p dir="auto">This project embeds the <a href="https://github.com/evansm7/umac">umac Mac 128K emulator</a> project into a Raspberry Pi Pico microcontroller. At long last, the worst Macintosh in a cheap, portable form factor!</p> <p dir="auto">It has features, many features, the best features:</p> <ul dir="auto"> <li>Outputs VGA 640x480@60Hz, monochrome, using three resistors</li> <li>USB HID keyboard and mouse</li> <li>Read-only disc image in flash (your creations are ephemeral, like life itself)</li> <li>Or, if you have a hard time letting go, support for rewritable disc storage on an SPI-attached SD card</li> <li>Mac 128K by default, or you can make use of more of the Pico's memory and run as a <em>Mac 208K</em></li> <li>Since you now have more memory, you can splash out on more screen real-estate, and use 640x480 resolution!</li> </ul> <p dir="auto">Great features. It even doesn't hang at random! (Anymore.)</p> <p dir="auto">The <em>Mac 208K</em> was, of course, never a real machine. But, <em>umac</em> supports odd-sized memories, and more memory runs more things. A surprising amount of software runs on the 128K config, but if you need to run <em>MacPaint</em> specifically then you'll need to build both SD storage in addition to the <em>Mac 208K</em> config.</p> <p dir="auto">So anyway, you can build this project yourself for less than the cost of a beer! You'll need at least a RPi Pico board, a VGA monitor (or VGA-HDMI adapter), a USB mouse (and maybe a USB keyboard/hub), plus a couple of cheap components.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Build</h1><a id="user-content-build" class="anchor" aria-label="Permalink: Build" href="#build"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Prerequisites/essentials</h2><a id="user-content-prerequisitesessentials" class="anchor" aria-label="Permalink: Prerequisites/essentials" href="#prerequisitesessentials"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>git submodules <ul dir="auto"> <li>Clone the repo with <code>--recursive</code>, or <code>git submodule update --init --recursive</code></li> </ul> </li> <li>Install/set up the <a href="https://github.com/raspberrypi/pico-sdk">Pico/RP2040 SDK</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Build umac</h2><a id="user-content-build-umac" class="anchor" aria-label="Permalink: Build umac" href="#build-umac"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Install and build <code>umac</code> first. It'll give you a preview of the fun to come, plus is required to generate a patched ROM image.</p> <p dir="auto">If you want to use a non-default memory size (i.e. >128K) you will need to build <code>umac</code> with a matching <code>MEMSIZE</code> build parameter, for example:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="cd external/umac make MEMSIZE=208"><pre class="notranslate"><code>cd external/umac make MEMSIZE=208 </code></pre></div> <p dir="auto">This is because <code>umac</code> is used to patch the ROM, and when using unsupported sizes between 128K and 512K the RAM size can't be probed automatically, so the size needs to be embedded.</p> <p dir="auto">This is also the case for altering the video resolution, because the ROM must be patched for this. Build <code>umac</code> with <code>DISP_WIDTH=640 DISP_HEIGHT=480</code> when you intend to use the <code>USE_VGA_RES</code> option. For example:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="cd external/umac make MEMSIZE=208 DISP_WIDTH=640 DISP_HEIGHT=480"><pre class="notranslate"><code>cd external/umac make MEMSIZE=208 DISP_WIDTH=640 DISP_HEIGHT=480 </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Build pico-umac</h2><a id="user-content-build-pico-umac" class="anchor" aria-label="Permalink: Build pico-umac" href="#build-pico-umac"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Do the initial Pico SDK <code>cmake</code> setup into an out-of-tree build dir, providing config options if required.</p> <p dir="auto">From the top-level <code>pico-umac</code> directory:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="mkdir build (cd build ; PICO_SDK_PATH=/path/to/sdk cmake .. <options>)"><pre class="notranslate"><code>mkdir build (cd build ; PICO_SDK_PATH=/path/to/sdk cmake .. <options>) </code></pre></div> <p dir="auto">Options are required if you want SD support, more than the default 128K of memory, higher resolution, to change pin configs, etc.:</p> <ul dir="auto"> <li><code>-DUSE_SD=true</code>: Include SD card support. The GPIOs default to <code>spi0</code> running at 5MHz, and GPIOs 2,3,4,5 for <code>SCK</code>/<code>TX</code>/<code>RX</code>/<code>CS</code> respectively. These can be overridden for your board/setup: <ul dir="auto"> <li><code>-DSD_TX=<gpio pin></code></li> <li><code>-DSD_RX=<gpio pin></code></li> <li><code>-DSD_SCK=<gpio pin></code></li> <li><code>-DSD_CS=<gpio pin></code></li> <li><code>-DSD_MHZ=<integer speed in MHz></code></li> </ul> </li> <li><code>-DMEMSIZE=<size in KB></code>: The maximum practical size is about 208KB, but values between 128 and 208 should work on a RP2040. Note that although apps and Mac OS seem to gracefully detect free memory, these products never existed and some apps might behave strangely. <ul dir="auto"> <li>With the <code>Mac Plus</code> ROM, a <em>Mac 128K</em> doesn't quite have enough memory to run <em>MacPaint</em>. So, 192 or 208 (and a writeable boot volume on SD) will allow <em>MacPaint</em> to run.</li> <li><strong>NOTE</strong>: When this option is used, the ROM image must be built with an <code>umac</code> build with a corresponding <code>MEMSIZE</code></li> </ul> </li> <li><code>-DUSE_VGA_RES=1</code>: Use 640x480 screen resolution instead of the native 512x342. This uses an additional 16KB of RAM, so this option makes a <em>Mac 128K</em> configuration virtually unusable. It is recommended only to use this when configuring >208K using the option above.</li> <li><code>-DVIDEO_PIN=<GPIO pin></code>: Move the video output pins; defaults to the pinout shown below.</li> </ul> <p dir="auto">Tip: <code>cmake</code> caches these variables, so if you see weird behaviour having built previously and then changed an option, delete the <code>build</code> directory and start again.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">ROM image</h2><a id="user-content-rom-image" class="anchor" aria-label="Permalink: ROM image" href="#rom-image"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The flow is to use <code>umac</code> built on your workstation (e.g. Linux, but WSL may work too) to prepare a patched ROM image.</p> <p dir="auto"><code>umac</code> is passed the 4D1F8172 MacPlusv3 ROM, and <code>-W</code> to write the post-patching binary out:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="./external/umac/main -r '4D1F8172 - MacPlus v3.ROM' -W rom.bin"><pre class="notranslate"><code>./external/umac/main -r '4D1F8172 - MacPlus v3.ROM' -W rom.bin </code></pre></div> <p dir="auto">Note: Again, remember that if you are using the <code>-DMEMSIZE</code> option to increase the <code>pico-umac</code> memory, or the <code>-DUSE_VGA_RES</code> option to increase the <code>pico-umac</code> screen resolution, you will need to create this ROM image with a <code>umac</code> built with the corresponding <code>MEMSIZE</code>/<code>DISP_WIDTH</code>/<code>DISP_HEIGHT</code> options, as above.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Disc image</h2><a id="user-content-disc-image" class="anchor" aria-label="Permalink: Disc image" href="#disc-image"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If you don't build SD support, an internal read-only disc image is stored in flash. If you do build SD support, you have the option to still include an image in flash, and this is used as a fallback if SD boot fails.</p> <p dir="auto">Grab a Macintosh system disc from somewhere. A 400K or 800K floppy image works just fine, up to System 3.2 (the last version to support Mac128Ks). I've used images from <a href="https://winworldpc.com/product/mac-os-0-6/system-3x" rel="nofollow">https://winworldpc.com/product/mac-os-0-6/system-3x</a> but also check the various forums and MacintoshRepository. See the <code>umac</code> README for info on formats (it needs to be raw data without header).</p> <p dir="auto">The image size can be whatever you have space for in flash (typically about 1.3MB is free there), or on the SD card. (I don't know what the HFS limits are. But if you make a 50MB disc you're unlikely to fill it with software that actually works on the <em>Mac 128K</em> :) )</p> <p dir="auto">If using an SD card, use a FAT-formatted card and copy your disc image into <em>one</em> of the following files in the root of the card:</p> <ul dir="auto"> <li><code>umac0.img</code>: A normal read/write disc image</li> <li><code>umac0ro.img</code>: A read-only disc image</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Putting it together, and building</h2><a id="user-content-putting-it-together-and-building" class="anchor" aria-label="Permalink: Putting it together, and building" href="#putting-it-together-and-building"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Given the <code>rom.bin</code> prepared above and a <code>disc.bin</code> destinated for flash, you can now generate includes from them and perform the build:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="mkdir incbin xxd -i < rom.bin > incbin/umac-rom.h # When using an internal disc image: xxd -i < disc.bin > incbin/umac-disc.h # OR, if using SD and if you do _not_ want an internal image: echo > incbin/umac-disc.h make -C build"><pre class="notranslate"><code>mkdir incbin xxd -i < rom.bin > incbin/umac-rom.h # When using an internal disc image: xxd -i < disc.bin > incbin/umac-disc.h # OR, if using SD and if you do _not_ want an internal image: echo > incbin/umac-disc.h make -C build </code></pre></div> <p dir="auto">You'll get a <code>build/firmware.uf2</code> out the other end. Flash this to your Pico: e.g. plug it in with button held/drag/drop. (When iterating/testing during development, unplugging the OTG cable each time is a pain – I ended up moving to SWD probe programming.)</p> <p dir="auto">The LED should flash at about 2Hz once powered up.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Hardware contruction</h1><a id="user-content-hardware-contruction" class="anchor" aria-label="Permalink: Hardware contruction" href="#hardware-contruction"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It's a simple circuit in terms of having few components: just the Pico, with three series resistors and a VGA connection, and DC power. However, if you're not comfortable soldering then don't choose this as your first project: I don't want you to zap your mouse, keyboard, monitor, SD cards...</p> <p dir="auto">Disclaimer: This is a hardware project with zero warranty. All due care has been taken in design/docs, but if you choose to build it then I disclaim any responsibility for your hardware or personal safety.</p> <p dir="auto">With that out of the way...</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Theory of operation</h2><a id="user-content-theory-of-operation" class="anchor" aria-label="Permalink: Theory of operation" href="#theory-of-operation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Three 3.3V GPIO pins are driven by PIO to give VSYNC, HSYNC, and video out signals.</p> <p dir="auto">The syncs are in many similar projects driven directly from GPIO, but here I suggest a 66Ω series resistor on each in order to keep the voltages at the VGA end (presumably into 75Ω termination?) in the correct range.</p> <p dir="auto">For the video output, one GPIO drives R,G,B channels for mono/white output. A 100Ω resistor gives roughly 0.7V (max intensity) into 3*75Ω signals.</p> <p dir="auto">That's it... power in, USB adapter.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Pinout and circuit</h2><a id="user-content-pinout-and-circuit" class="anchor" aria-label="Permalink: Pinout and circuit" href="#pinout-and-circuit"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Parts needed:</p> <ul dir="auto"> <li>Pico/RP2040 board</li> <li>USB OTG micro-B to A adapter</li> <li>USB keyboard, mouse (and hub, if not integrated)</li> <li>5V DC supply (600mA+), and maybe a DC jack</li> <li>100Ω resistor</li> <li>2x 66Ω resistors</li> <li>VGA DB15 connector, or janky chopped VGA cable</li> <li>(optional) SD card breakout, SD card</li> </ul> <p dir="auto">If you want to get fancy with an SD card, you will need some kind of SD card SPI breakout adapter. (There are a lot of these around, but many seem to have a buffer/level-converter for 5V operation. Find one without, or modify your adapter for a 3.3V supply. Doing so, and finding an SD card that works well with SPI is out of scope of this doc.)</p> <p dir="auto">Pins are given for a RPi Pico board, but this will work on any RP2040 board with 2MB+ flash as long as all required GPIOs are pinned out:</p> <markdown-accessiblity-table><table> <thead> <tr> <th>GPIO/pin</th> <th>Pico pin</th> <th>Usage</th> </tr> </thead> <tbody> <tr> <td>GP0</td> <td>1</td> <td>UART0 TX</td> </tr> <tr> <td>GP1</td> <td>2</td> <td>UART0 RX</td> </tr> <tr> <td>GP18</td> <td>24</td> <td>Video output %</td> </tr> <tr> <td>GP19</td> <td>25</td> <td>VSYNC</td> </tr> <tr> <td>GP21</td> <td>27</td> <td>HSYNC</td> </tr> <tr> <td>Gnd</td> <td>23, 28</td> <td>Video ground</td> </tr> <tr> <td>VBUS (5V)</td> <td>40</td> <td>+5V supply</td> </tr> <tr> <td>Gnd</td> <td>38</td> <td>Supply ground</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">%: The video pins default here, but can be moved by building with the <code>-DVIDEO_PIN</code> option. This sets the position of the Video pin, which is immediately followed by VSYNC, then a gap, then HSYNC. For example, <code>-DVIDEO_PIN=20</code> configures the Video pin at 20, VSYNC at 21, HSYNC at 23.</p> <p dir="auto">Method:</p> <ul dir="auto"> <li>Wire 5V supply to VBUS/Gnd</li> <li>Video output --> 100Ω --> VGA RGB (pins 1,2,3) all connected together</li> <li>HSYNC --> 66Ω --> VGA pin 13</li> <li>VSYNC --> 66Ω --> VGA pin 14</li> <li>Video ground --> VGA grounds (pins 5-8, 10)</li> </ul> <p dir="auto">If you don't have exactly 100Ω, using slightly more is OK but display will be dimmer. If you don't have 66Ω for the syncs, connecting them directly is "probably OK", but YMMV.</p> <p dir="auto">If you are including an SD card, the default pinout is as follows (this can be changed at build time, above):</p> <markdown-accessiblity-table><table> <thead> <tr> <th>GPIO/pin</th> <th>Pico pin</th> <th>Usage</th> </tr> </thead> <tbody> <tr> <td>GP2</td> <td>4</td> <td>SPI0 SCK</td> </tr> <tr> <td>GP3</td> <td>5</td> <td>SPI0 TX (MOSI)</td> </tr> <tr> <td>GP4</td> <td>6</td> <td>SPI0 RX (MISO)</td> </tr> <tr> <td>GP5</td> <td>7</td> <td>SPI0 /CS</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">(The SD card needs a good ground, e.g. Pico pin 8 nearby, and 3.3V supply from Pico pin 36.)</p> <p dir="auto">If your SD breakout board is "raw", i.e. has no buffer or series resistors on-board, you may find adding a 66Ω resistor in series on all of the four signal lines will help. Supply decoupling caps will also be important (e.g. 1uF+0.1uF) to keep the SD card happy. <em>Keep SD card wiring short.</em> The default SPI clock (5MHz) is conservative/slow, but I suggest verifying the circuit/SD card works before increasing it.</p> <p dir="auto">Test your connections: the key part is not getting over 0.7V into your VGA connector's signals, or shorting SD card pins.</p> <p dir="auto">Connect USB mouse, and keyboard if you like, and power up.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Software</h1><a id="user-content-software" class="anchor" aria-label="Permalink: Software" href="#software"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Both CPU cores are used, and are overclocked (blush) to 250MHz so that Missile Command is enjoyable to play.</p> <p dir="auto">The <code>umac</code> emulator and video output runs on core 1, and core 0 deals with USB HID input. Video DMA is initialised pointing to the framebuffer in the Mac's RAM.</p> <p dir="auto">Other than that, it's just a main loop in <code>main.c</code> shuffling things into <code>umac</code>.</p> <p dir="auto">Quite a lot of optimisation has been done in <code>umac</code> and <code>Musashi</code> to get performance up on Cortex-M0+ and the RP2040, like careful location of certain routines in RAM, ensuring inlining/constants can be foldeed, etc. It's 5x faster than it was at the beginning.</p> <p dir="auto">The top-level project might be a useful framework for other emulators, or other projects that need USB HID input and a framebuffer (e.g. a VT220 emulator!).</p> <p dir="auto">The USB HID code is largely stolen from the TinyUSB example, but shows how in practice you might capture keypresses/deal with mouse events.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Video</h2><a id="user-content-video" class="anchor" aria-label="Permalink: Video" href="#video"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The video system is pretty good and IMHO worth stealing for other projects: It uses one PIO state machine and 3 DMA channels to provide a rock-solid bitmapped 1BPP 640x480 video output. The Mac 512x342 framebuffer is centred inside this by using horizontal blanking regions (programmed into the line scan-out) and vertical blanking areas from a dummy "always black" mini-framebuffer.</p> <p dir="auto">It supports (at build time) flexible resolutions/timings. The one caveat (or advantage?) is that it uses an HSYNC IRQ routine to recalculate the next DMA buffer pointer; doing this at scan-time costs about 1% of the CPU time (on core 1). However, it could be used to generate video on-the-fly from characters/tiles without a true framebuffer.</p> <p dir="auto">I'm considering improvements to the video system:</p> <ul dir="auto"> <li>Supporting multiple BPP/colour output</li> <li>Implement the rest of <code>DE</code>/display valid strobe support, making driving LCDs possible.</li> <li>Using a video DMA address list and another DMA channel to reduce the IRQ frequency (CPU overhead) to per-frame, at the cost of a couple of KB of RAM.</li> </ul> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Licence</h1><a id="user-content-licence" class="anchor" aria-label="Permalink: Licence" href="#licence"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><code>hid.c</code> and <code>tusb_config.h</code> are based on code from the TinyUSB project, which is Copyright (c) 2019, 2021 Ha Thach (tinyusb.org) and released under the MIT licence. <code>sd_hw_config.c</code> is based on code from the no-OS-FatFS-SD-SPI-RPi-Pico project, which is Copyright (c) 2021 Carl John Kugler III.</p> <p dir="auto">The remainder of the code is released under the MIT licence:</p> <p dir="auto">Copyright (c) 2024 Matt Evans:</p> <p dir="auto">Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:</p> <p dir="auto">The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.</p> <p dir="auto">THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="Q/8qF+Ru1ucj6qVtS5MfUpsdA0CCB679WkMxAYql/EiTTw/KxX1a7Ba4ijWj3/vLEEjGjtoTH+tstMUm+4/H9A==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> Run the popular umac emulator right on your Pi Pico! </p> <h3 class="sr-only">Resources</h3> <div class="mt-2"> <a class="Link--muted" 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0-1.06Z"></path> </svg> </button> You can’t perform that action at this time. </div> <template id="site-details-dialog"> <details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open> <summary role="button" aria-label="Close dialog"></summary> <details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal"> <button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> <div class="octocat-spinner my-6 js-details-dialog-spinner"></div> </details-dialog> </details> </template> <div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;"> <div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;"> </div> </div> <template id="snippet-clipboard-copy-button"> <div class="zeroclipboard-container position-absolute right-0 top-0"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> <template id="snippet-clipboard-copy-button-unpositioned"> <div class="zeroclipboard-container"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> </div> <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div> <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div> </body> </html>