{"wikiid":172927,"langid":"en","namespace":"CATEGORY","title":"Macintosh plus","revisionid":2766856,"contents_raw":"== Background and Identification ==\n\nThe Macintosh Plus, also known by the shorter \u201cMac Plus,\u201c was an update to the original Macintosh and Macintosh 512K to make the Macintosh line of computers more expandable. While the original Mac and Mac 512K feature 128 KB and 512 KB of memory respectively, the Mac Plus shipped with 1 MB. Additionally, while the previous two Macs use non-upgradeable memory, the Mac Plus includes four SIMM slots which can be populated with up to 4 MB of total memory.\n\nThe Mac Plus was the first Apple computer to use a double-sided [link|https:\/\/en.wikipedia.org\/wiki\/Floppy_disk|floppy disk] drive which allows users to store up to 800 KB on a 3.5-inch floppy. The computer does not have an internal hard drive, but it has a new (for the time) [link|https:\/\/en.wikipedia.org\/wiki\/SCSI|SCSI] port on the back which you can use to connect external hard drives, zip drives, or CD-ROM readers.\n\nThe Mac Plus was originally released with a beige case, but a platinum-colored version was introduced in 1987. The computer has the words \u201cMacintosh Plus\u201c (or \u201cMacintosh Plus ED\u201d for the education version) written on the front case. Apple offered an upgrade kit for the original Mac and Mac 512K, so some computers with the internals of a Mac Plus have the front case from an older model. To be sure, look for the words \u201cMacintosh Plus\u201c and the model number M0001A on the ''back'' case.\n\nIt is safe to open the case on the computer, but do not touch the back of the monitor (called the [link|https:\/\/en.wikipedia.org\/wiki\/Deflection_yoke|yoke]) or any capacitors near the power cable port. ***These areas can contain lethal voltages.*** Of course, disconnect the power cable first, then follow [link|https:\/\/www.wikihow.com\/Discharge-a-CRT-Monitor|this guide on WikiHow] to discharge the CRT monitor. This [guide|75901|iFixit guide] shows how to discharge the large capacitors by the power input. It\u2019s safe to work on your Mac Plus ''if'' you follow the proper procedures: be safe, but don\u2019t be afraid to fix your machine.\n\n== Technical Specifications ==\n\n***Processor***\n\n* Motorola MC68000\n* 8 MHz\n\n***Memory***\n\n* Four 30-pin SIMM slots\n* 4 MB maximum\n\n***Storage***\n\n* Double-sided 3.5\u201d floppy drive (up to 800 KB disks)\n* SCSI port for external storage\n\n***Display***\n\n* 512x342 pixels\n* 9 inches\n\n***Software***\n\n* Minimum System 3.0\n* Maximum System 7.5.5\n\n== Additional Information ==\n\n[link|https:\/\/en.wikipedia.org\/wiki\/Macintosh_Plus|Macintosh Plus on Wikipedia]\n\n[link|https:\/\/apple-history.com\/plus|Macintosh Plus on Apple-History]\n\n[link|https:\/\/en.wikipedia.org\/wiki\/Macintosh_512K|Macintosh 512K on Wikipedia]\n\n[link|https:\/\/en.wikipedia.org\/wiki\/Macintosh_128K|Original Macintosh on Wikipedia]\n\n[document|135116|Macintosh Computers Service Guide (March 1991 Update)]\n\n[document|135124|Macintosh Computers Vol. I: Compact & Portable Computers Service Guide]\n\n[document|163333|Peripheral Interface Guide: Service Technical Procedures]\n\n[document|156552|Macintosh Computers Service Guide]\n\n[document|156579|Apple Service Technical Procedures Macintosh Family Volume One]\n\n[document|343216|Apple ImageWriter II User Guide]\n\n[document|1497491|Apple Macintosh Plus SE SE\/30 Schematics]\n\n[document|1499954|Apple ImageWriter II Owner's Manual]\n\n[document|1483023|Apple Macintosh Plus, Classic, and SE Memory Installation Instructions]\n\n[document|1501275|Apple Hard Disk SC Owner's Guide]\n\n[document|2003026|Macintosh Plus Service Source Manual]\n\n[document|160459|Macintosh Service Course Prerequisite Manual \u2013 Vol. 2]\n\n[document|163319|Macintosh Computers Service Guide]","contents_json":{"type":"doc","content":[{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"Background and Identification"}]},{"type":"paragraph","content":[{"type":"text","text":"The Macintosh Plus, also known by the shorter \u201cMac Plus,\u201c was an update to the original Macintosh and Macintosh 512K to make the Macintosh line of computers more expandable. While the original Mac and Mac 512K feature 128 KB and 512 KB of memory respectively, the Mac Plus shipped with 1 MB. Additionally, while the previous two Macs use non-upgradeable memory, the Mac Plus includes four SIMM slots which can be populated with up to 4 MB of total memory."}]},{"type":"paragraph","content":[{"type":"text","text":"The Mac Plus was the first Apple computer to use a double-sided "},{"type":"text","marks":[{"type":"link","attrs":{"href":"https:\/\/en.wikipedia.org\/wiki\/Floppy_disk","target":false}}],"text":"floppy disk"},{"type":"text","text":" drive which allows users to store up to 800 KB on a 3.5-inch floppy. The computer does not have an internal hard drive, but it has a new (for the time) "},{"type":"text","marks":[{"type":"link","attrs":{"href":"https:\/\/en.wikipedia.org\/wiki\/SCSI","target":false}}],"text":"SCSI"},{"type":"text","text":" port on the back which you can use to connect external hard drives, zip drives, or CD-ROM readers."}]},{"type":"paragraph","content":[{"type":"text","text":"The Mac Plus was originally released with a beige case, but a platinum-colored version was introduced in 1987. The computer has the words \u201cMacintosh Plus\u201c (or \u201cMacintosh Plus ED\u201d for the education version) written on the front case. Apple offered an upgrade kit for the original Mac and Mac 512K, so some computers with the internals of a Mac Plus have the front case from an older model. To be sure, look for the words \u201cMacintosh Plus\u201c and the model number M0001A on the "},{"type":"text","text":"back","marks":[{"type":"italic"}]},{"type":"text","text":" case."}]},{"type":"paragraph","content":[{"type":"text","text":"It is safe to open the case on the computer, but do not touch the back of the monitor (called the "},{"type":"text","marks":[{"type":"link","attrs":{"href":"https:\/\/en.wikipedia.org\/wiki\/Deflection_yoke","target":false}}],"text":"yoke"},{"type":"text","text":") or any capacitors near the power cable port. "},{"type":"text","text":"These areas can contain lethal voltages.","marks":[{"type":"bold"}]},{"type":"text","text":" Of course, disconnect the power cable first, then follow "},{"type":"text","marks":[{"type":"link","attrs":{"href":"https:\/\/www.wikihow.com\/Discharge-a-CRT-Monitor","target":false}}],"text":"this guide on WikiHow"},{"type":"text","text":" to discharge the CRT monitor. This "},{"type":"text","text":"iFixit guide","marks":[{"type":"siteLink","attrs":{"kind":"guide","id":"75901","options":"","defaultText":null,"newWindow":false,"href":"\/Guide\/How+to+Safely+Discharge+a+Capacitor\/75901"}}]},{"type":"text","text":" shows how to discharge the large capacitors by the power input. It\u2019s safe to work on your Mac Plus "},{"type":"text","text":"if","marks":[{"type":"italic"}]},{"type":"text","text":" you follow the proper procedures: be safe, but don\u2019t be afraid to fix your machine."}]},{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"Technical Specifications"}]},{"type":"paragraph","content":[{"type":"text","text":"Processor","marks":[{"type":"bold"}]}]},{"type":"bulletList","attrs":[],"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Motorola MC68000"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"8 MHz"}]}]}]},{"type":"paragraph","content":[{"type":"text","text":"Memory","marks":[{"type":"bold"}]}]},{"type":"bulletList","attrs":[],"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Four 30-pin SIMM slots"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"4 MB maximum"}]}]}]},{"type":"paragraph","content":[{"type":"text","text":"Storage","marks":[{"type":"bold"}]}]},{"type":"bulletList","attrs":[],"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Double-sided 3.5\u201d floppy drive (up to 800 KB disks)"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"SCSI port for external storage"}]}]}]},{"type":"paragraph","content":[{"type":"text","text":"Display","marks":[{"type":"bold"}]}]},{"type":"bulletList","attrs":[],"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"512x342 pixels"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"9 inches"}]}]}]},{"type":"paragraph","content":[{"type":"text","text":"Software","marks":[{"type":"bold"}]}]},{"type":"bulletList","attrs":[],"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Minimum System 3.0"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Maximum System 7.5.5"}]}]}]},{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"Additional Information"}]},{"type":"paragraph","content":[{"type":"text","marks":[{"type":"link","attrs":{"href":"https:\/\/en.wikipedia.org\/wiki\/Macintosh_Plus","target":false}}],"text":"Macintosh Plus on Wikipedia"}]},{"type":"paragraph","content":[{"type":"text","marks":[{"type":"link","attrs":{"href":"https:\/\/apple-history.com\/plus","target":false}}],"text":"Macintosh Plus on Apple-History"}]},{"type":"paragraph","content":[{"type":"text","marks":[{"type":"link","attrs":{"href":"https:\/\/en.wikipedia.org\/wiki\/Macintosh_512K","target":false}}],"text":"Macintosh 512K on Wikipedia"}]},{"type":"paragraph","content":[{"type":"text","marks":[{"type":"link","attrs":{"href":"https:\/\/en.wikipedia.org\/wiki\/Macintosh_128K","target":false}}],"text":"Original Macintosh on Wikipedia"}]},{"type":"paragraph","content":[{"type":"text","text":"Macintosh Computers Service Guide (March 1991 Update)","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"135116","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/LBphsRqMdPNx3tRZ\/Macintosh-Computers-Service-Guide-March-1991-Update.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Macintosh Computers Vol. I: Compact & Portable Computers Service Guide","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"135124","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/QsqicUXOXfwCy2cH\/Macintosh-Computers-Vol-I-Compact-Portable-Computers-Service-Guide.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Peripheral Interface Guide: Service Technical Procedures","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"163333","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/XAidmZrPCE1kW3Ob\/Peripheral-Interface-Guide-Service-Technical-Procedures.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Macintosh Computers Service Guide","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"156552","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/jrFTkPDMVXhucNQs\/Macintosh-Computers-Service-Guide.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Apple Service Technical Procedures Macintosh Family Volume One","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"156579","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/TQEraa4iwoJer6V6\/Apple-Service-Technical-Procedures-Macintosh-Family-Volume-One.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Apple ImageWriter II User Guide","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"343216","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/g21DB21wQD3F5JJl\/Apple-ImageWriter-II-User-Guide.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Apple Macintosh Plus SE SE\/30 Schematics","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"1497491","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/rR3uSBtTpVVEmlxS\/Apple-Macintosh-Plus-SE-SE-30-Schematics.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Apple ImageWriter II Owner's Manual","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"1499954","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/UpAWLhMtigWf4anx\/Apple-ImageWriter-II-Owners-Manual.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Apple Macintosh Plus, Classic, and SE Memory Installation Instructions","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"1483023","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/sBnOmeBKME6TcuZi\/Apple-Macintosh-Plus-Classic-and-SE-Memory-Installation-Instructions.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Apple Hard Disk SC Owner's Guide","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"1501275","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/1qAukMYvQPGgv1K1\/Apple-Hard-Disk-SC-Owners-Guide.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Macintosh Plus Service Source Manual","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"2003026","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/TvlOrJuh6OUrRnQV\/Macintosh-Plus-Service-Source-Manual.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Macintosh Service Course Prerequisite Manual \u2013 Vol. 2","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"160459","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/b4xLXIBWNFMPnmMu\/Macintosh-Service-Course-Prerequisite-Manual-Vol-2.pdf"}}]}]},{"type":"paragraph","content":[{"type":"text","text":"Macintosh Computers Service Guide","marks":[{"type":"siteLink","attrs":{"kind":"document","id":"163319","options":"","defaultText":null,"newWindow":false,"href":"\/Document\/hRr4gEOjtcaLxIhO\/Macintosh-Computers-Service-Guide.pdf"}}]}]}]},"contents_rendered":"<div class=\"clearer\"><\/div><div class=\"headerContainer\"><a class=\"selfLink\" href=\"#Section_Background_and_Identification\" title=\"Link to this section\" aria-hidden=\"true\" tabindex=\"-1\"><span    class=\"fa-svg-icon\"><svg width=\"16\" height=\"16\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M427.5 88c-21.4 0-42.2 6.9-59.3 19.4-11.4-11.7-24.4-22.1-38.4-30.7 27-23.6 61.7-36.7 97.7-36.7 82 0 148.5 66.5 148.5 148.5 0 39.4-15.6 77.1-43.5 105l-79.1 79.1c-27.8 27.8-65.6 43.5-105 43.5-82 0-148.5-66.5-148.5-148.5 0-17.9 3.2-35.5 9.4-51.9 4.6-12.4 18.5-18.7 30.9-14.1S259 220 254.4 232.4c-4.2 11.1-6.4 23-6.4 35.2 0 55.5 45 100.5 100.5 100.5 26.6 0 52.2-10.6 71-29.4l79.1-79.1C517.4 240.6 528 215.1 528 188.5 528 133 483 88 427.5 88zm-200 56c-26.6 0-52.2 10.6-71 29.4L77.4 252.5c-18.8 18.8-29.4 44.4-29.4 71 0 55.5 45 100.5 100.5 100.5 21.4 0 42.2-6.9 59.3-19.4 11.4 11.8 24.4 22.1 38.4 30.7-27 23.6-61.7 36.7-97.7 36.7-82 0-148.5-66.5-148.5-148.5 0-39.4 15.6-77.1 43.5-105l79.1-79.1c27.8-27.8 65.6-43.5 105-43.5 82 0 148.5 66.5 148.5 148.5 0 17.9-3.2 35.5-9.4 51.9-4.6 12.4-18.5 18.7-30.9 14.1S317 292 321.6 279.6c4.2-11.1 6.4-23 6.4-35.1 0-55.5-45-100.5-100.5-100.5z\"\/><\/svg><\/span><\/a><h2 id=\"Section_Background_and_Identification\" class=\"header\">Background and Identification<\/h2><\/div>\n\n<p>The Macintosh Plus, also known by the shorter \u201cMac Plus,\u201c was an update to the original Macintosh and Macintosh 512K to make the Macintosh line of computers more expandable. While the original Mac and Mac 512K feature 128 KB and 512 KB of memory respectively, the Mac Plus shipped with 1 MB. Additionally, while the previous two Macs use non-upgradeable memory, the Mac Plus includes four SIMM slots which can be populated with up to 4 MB of total memory.<\/p>\n\n<p>The Mac Plus was the first Apple computer to use a double-sided <a href=\"https:\/\/en.wikipedia.org\/wiki\/Floppy_disk\">floppy disk<\/a> drive which allows users to store up to 800 KB on a 3.5-inch floppy. The computer does not have an internal hard drive, but it has a new (for the time) <a href=\"https:\/\/en.wikipedia.org\/wiki\/SCSI\">SCSI<\/a> port on the back which you can use to connect external hard drives, zip drives, or CD-ROM readers.<\/p>\n\n<p>The Mac Plus was originally released with a beige case, but a platinum-colored version was introduced in 1987. The computer has the words \u201cMacintosh Plus\u201c (or \u201cMacintosh Plus ED\u201d for the education version) written on the front case. Apple offered an upgrade kit for the original Mac and Mac 512K, so some computers with the internals of a Mac Plus have the front case from an older model. To be sure, look for the words \u201cMacintosh Plus\u201c and the model number M0001A on the <em>back<\/em> case.<\/p>\n\n<p>It is safe to open the case on the computer, but do not touch the back of the monitor (called the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Deflection_yoke\">yoke<\/a>) or any capacitors near the power cable port. <strong>These areas can contain lethal voltages.<\/strong> Of course, disconnect the power cable first, then follow <a href=\"https:\/\/www.wikihow.com\/Discharge-a-CRT-Monitor\" rel=\"nofollow noopener noreferrer\">this guide on WikiHow<\/a> to discharge the CRT monitor. This <a href=\"\/Guide\/How+to+Safely+Discharge+a+Capacitor\/75901\">iFixit guide<\/a> shows how to discharge the large capacitors by the power input. It\u2019s safe to work on your Mac Plus <em>if<\/em> you follow the proper procedures: be safe, but don\u2019t be afraid to fix your machine.<\/p>\n\n<div class=\"clearer\"><\/div><div class=\"headerContainer\"><a class=\"selfLink\" href=\"#Section_Technical_Specifications\" title=\"Link to this section\" aria-hidden=\"true\" tabindex=\"-1\"><span    class=\"fa-svg-icon\"><svg width=\"16\" height=\"16\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M427.5 88c-21.4 0-42.2 6.9-59.3 19.4-11.4-11.7-24.4-22.1-38.4-30.7 27-23.6 61.7-36.7 97.7-36.7 82 0 148.5 66.5 148.5 148.5 0 39.4-15.6 77.1-43.5 105l-79.1 79.1c-27.8 27.8-65.6 43.5-105 43.5-82 0-148.5-66.5-148.5-148.5 0-17.9 3.2-35.5 9.4-51.9 4.6-12.4 18.5-18.7 30.9-14.1S259 220 254.4 232.4c-4.2 11.1-6.4 23-6.4 35.2 0 55.5 45 100.5 100.5 100.5 26.6 0 52.2-10.6 71-29.4l79.1-79.1C517.4 240.6 528 215.1 528 188.5 528 133 483 88 427.5 88zm-200 56c-26.6 0-52.2 10.6-71 29.4L77.4 252.5c-18.8 18.8-29.4 44.4-29.4 71 0 55.5 45 100.5 100.5 100.5 21.4 0 42.2-6.9 59.3-19.4 11.4 11.8 24.4 22.1 38.4 30.7-27 23.6-61.7 36.7-97.7 36.7-82 0-148.5-66.5-148.5-148.5 0-39.4 15.6-77.1 43.5-105l79.1-79.1c27.8-27.8 65.6-43.5 105-43.5 82 0 148.5 66.5 148.5 148.5 0 17.9-3.2 35.5-9.4 51.9-4.6 12.4-18.5 18.7-30.9 14.1S317 292 321.6 279.6c4.2-11.1 6.4-23 6.4-35.1 0-55.5-45-100.5-100.5-100.5z\"\/><\/svg><\/span><\/a><h2 id=\"Section_Technical_Specifications\" class=\"header\">Technical Specifications<\/h2><\/div>\n\n<p><strong>Processor<\/strong><\/p>\n\n<ul><li>Motorola MC68000<\/li><li>8 MHz<\/li><\/ul>\n\n<p><strong>Memory<\/strong><\/p>\n\n<ul><li>Four 30-pin SIMM slots<\/li><li>4 MB maximum<\/li><\/ul>\n\n<p><strong>Storage<\/strong><\/p>\n\n<ul><li>Double-sided 3.5\u201d floppy drive (up to 800 KB disks)<\/li><li>SCSI port for external storage<\/li><\/ul>\n\n<p><strong>Display<\/strong><\/p>\n\n<ul><li>512x342 pixels<\/li><li>9 inches<\/li><\/ul>\n\n<p><strong>Software<\/strong><\/p>\n\n<ul><li>Minimum System 3.0<\/li><li>Maximum System 7.5.5<\/li><\/ul>\n\n<div class=\"clearer\"><\/div><div class=\"headerContainer\"><a class=\"selfLink\" href=\"#Section_Additional_Information\" title=\"Link to this section\" aria-hidden=\"true\" tabindex=\"-1\"><span    class=\"fa-svg-icon\"><svg width=\"16\" height=\"16\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M427.5 88c-21.4 0-42.2 6.9-59.3 19.4-11.4-11.7-24.4-22.1-38.4-30.7 27-23.6 61.7-36.7 97.7-36.7 82 0 148.5 66.5 148.5 148.5 0 39.4-15.6 77.1-43.5 105l-79.1 79.1c-27.8 27.8-65.6 43.5-105 43.5-82 0-148.5-66.5-148.5-148.5 0-17.9 3.2-35.5 9.4-51.9 4.6-12.4 18.5-18.7 30.9-14.1S259 220 254.4 232.4c-4.2 11.1-6.4 23-6.4 35.2 0 55.5 45 100.5 100.5 100.5 26.6 0 52.2-10.6 71-29.4l79.1-79.1C517.4 240.6 528 215.1 528 188.5 528 133 483 88 427.5 88zm-200 56c-26.6 0-52.2 10.6-71 29.4L77.4 252.5c-18.8 18.8-29.4 44.4-29.4 71 0 55.5 45 100.5 100.5 100.5 21.4 0 42.2-6.9 59.3-19.4 11.4 11.8 24.4 22.1 38.4 30.7-27 23.6-61.7 36.7-97.7 36.7-82 0-148.5-66.5-148.5-148.5 0-39.4 15.6-77.1 43.5-105l79.1-79.1c27.8-27.8 65.6-43.5 105-43.5 82 0 148.5 66.5 148.5 148.5 0 17.9-3.2 35.5-9.4 51.9-4.6 12.4-18.5 18.7-30.9 14.1S317 292 321.6 279.6c4.2-11.1 6.4-23 6.4-35.1 0-55.5-45-100.5-100.5-100.5z\"\/><\/svg><\/span><\/a><h2 id=\"Section_Additional_Information\" class=\"header\">Additional Information<\/h2><\/div>\n\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Macintosh_Plus\">Macintosh Plus on Wikipedia<\/a><\/p>\n\n<p><a href=\"https:\/\/apple-history.com\/plus\" rel=\"nofollow noopener noreferrer\">Macintosh Plus on Apple-History<\/a><\/p>\n\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Macintosh_512K\">Macintosh 512K on Wikipedia<\/a><\/p>\n\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Macintosh_128K\">Original Macintosh on Wikipedia<\/a><\/p>\n\n<p><a href=\"\/Document\/LBphsRqMdPNx3tRZ\/Macintosh-Computers-Service-Guide-March-1991-Update.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Macintosh Computers Service Guide (March 1991 Update)<\/a><\/p>\n\n<p><a href=\"\/Document\/QsqicUXOXfwCy2cH\/Macintosh-Computers-Vol-I-Compact-Portable-Computers-Service-Guide.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Macintosh Computers Vol. I: Compact &amp; Portable Computers Service Guide<\/a><\/p>\n\n<p><a href=\"\/Document\/XAidmZrPCE1kW3Ob\/Peripheral-Interface-Guide-Service-Technical-Procedures.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Peripheral Interface Guide: Service Technical Procedures<\/a><\/p>\n\n<p><a href=\"\/Document\/jrFTkPDMVXhucNQs\/Macintosh-Computers-Service-Guide.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Macintosh Computers Service Guide<\/a><\/p>\n\n<p><a href=\"\/Document\/TQEraa4iwoJer6V6\/Apple-Service-Technical-Procedures-Macintosh-Family-Volume-One.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Apple Service Technical Procedures Macintosh Family Volume One<\/a><\/p>\n\n<p><a href=\"\/Document\/g21DB21wQD3F5JJl\/Apple-ImageWriter-II-User-Guide.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Apple ImageWriter II User Guide<\/a><\/p>\n\n<p><a href=\"\/Document\/rR3uSBtTpVVEmlxS\/Apple-Macintosh-Plus-SE-SE-30-Schematics.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Apple Macintosh Plus SE SE\/30 Schematics<\/a><\/p>\n\n<p><a href=\"\/Document\/UpAWLhMtigWf4anx\/Apple-ImageWriter-II-Owners-Manual.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Apple ImageWriter II Owner's Manual<\/a><\/p>\n\n<p><a href=\"\/Document\/sBnOmeBKME6TcuZi\/Apple-Macintosh-Plus-Classic-and-SE-Memory-Installation-Instructions.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Apple Macintosh Plus, Classic, and SE Memory Installation Instructions<\/a><\/p>\n\n<p><a href=\"\/Document\/1qAukMYvQPGgv1K1\/Apple-Hard-Disk-SC-Owners-Guide.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Apple Hard Disk SC Owner's Guide<\/a><\/p>\n\n<p><a href=\"\/Document\/TvlOrJuh6OUrRnQV\/Macintosh-Plus-Service-Source-Manual.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Macintosh Plus Service Source Manual<\/a><\/p>\n\n<p><a href=\"\/Document\/b4xLXIBWNFMPnmMu\/Macintosh-Service-Course-Prerequisite-Manual-Vol-2.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! Font Awesome Pro 7.3.1 by @fontawesome - https:\/\/fontawesome.com License - https:\/\/fontawesome.com\/license (Commercial License) Copyright 2026 Fonticons, Inc. --><path d=\"M64 48l112 0 0 88c0 39.8 32.2 72 72 72l88 0 0 240c0 8.8-7.2 16-16 16L64 464c-8.8 0-16-7.2-16-16L48 64c0-8.8 7.2-16 16-16zM224 67.9l92.1 92.1-68.1 0c-13.3 0-24-10.7-24-24l0-68.1zM64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-261.5c0-17-6.7-33.3-18.7-45.3L242.7 18.7C230.7 6.7 214.5 0 197.5 0L64 0zm56 256c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0zm0 96c-13.3 0-24 10.7-24 24s10.7 24 24 24l144 0c13.3 0 24-10.7 24-24s-10.7-24-24-24l-144 0z\"\/><\/svg><\/span>Macintosh Service Course Prerequisite Manual \u2013 Vol. 2<\/a><\/p>\n\n<p><a href=\"\/Document\/hRr4gEOjtcaLxIhO\/Macintosh-Computers-Service-Guide.pdf\" class=\"docLink\"><span    class=\"fa-svg-icon docLink-icon\"><svg width=\"14\" height=\"14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\" overflow=\"visible\"><!--! 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