{"id":21358,"date":"2025-06-19T14:02:20","date_gmt":"2025-06-19T18:02:20","guid":{"rendered":"https:\/\/carleton.ca\/scs\/?page_id=21358"},"modified":"2026-03-02T21:50:30","modified_gmt":"2026-03-03T02:50:30","slug":"vin112","status":"publish","type":"page","link":"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin112\/","title":{"rendered":"Imsai VDP-80"},"content":{"rendered":"<h2>Imsai VDP-80<\/h2>\n<p>[Vin112]<\/p>\n<p><a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/first-place-400x400-1.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignleft wp-image-21940\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/first-place-400x400-1-160x160.png\" alt=\"First Ever icon\" width=\"86\" height=\"86\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/first-place-400x400-1-160x160.png 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/first-place-400x400-1-240x240.png 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/first-place-400x400-1-200x200.png 200w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/first-place-400x400-1-360x360.png 360w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/first-place-400x400-1.png 400w\" sizes=\"(max-width: 86px) 100vw, 86px\" \/><\/a>The IMSAI VDP-80, released in 1977, was a pioneering all-in-one microcomputer notable for integrating a 3 MHz Intel 8085 processor, 32K or 64K RAM, dual 8-inch floppy drives, a 12-inch video display, and a full alphanumeric keyboard with advanced features like N-key rollove all within a single desktop cabinet. Its claim to fame was being among the first microcomputers shipped fully assembled and ready to use, targeting small businesses and professional users at a time when most systems were sold as kits, and it came bundled with IMDOS (an enhanced CP\/M variant) and BASIC, making it a turnkey solution for data processing and business applications. Although technologically advanced, the VDP-80 (Video Display Processor) was expensive and heavy, and its popularity was limited compared to emerging competitors like the Apple II and TRS-80; IMSAI\u2019s bankruptcy in 1979 marked the end of its brief prominence.<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-large wp-image-21535\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-400x300.jpg\" alt=\"Imsai VDP-80\" width=\"400\" height=\"300\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250707_190751665-360x270.jpg 360w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<ul>\n<li><strong>Manufacturer<\/strong>: IMS Associates, Inc., later known as IMSAI Manufacturing Corp, based in San Leandro, California<\/li>\n<li><strong>Type<\/strong>: All-in-one desktop computer<\/li>\n<li><strong>Release Date<\/strong>: 1977<\/li>\n<li><strong>Cost at release<\/strong>: USD $6,995 (CAD ~$36,000 adjusted for inflation)<\/li>\n<li><strong>MIPS<\/strong>: 0.3 (300 KIPS)<\/li>\n<\/ul>\n<h3>Hardware Specifications<\/h3>\n<ul>\n<li><strong>CPU<\/strong>: Intel 8085 microprocessor, 3 MHz<\/li>\n<li><strong>RAM<\/strong>: 32K or 64K RAM (expandable)<\/li>\n<li><strong>Storage<\/strong>: Dual 8-inch PerSci floppy disk drives (double density)<\/li>\n<li><strong>Display<\/strong>: 12-inch CRT video display 80 columns \u00d7 24 lines<\/li>\n<li><strong>Keyboard<\/strong>: Integrated alphanumeric 62-key main keyboard<\/li>\n<li>7-slot motherboard for expansion<\/li>\n<li>Serial and parallel I\/O ports (printer\/modem support)<\/li>\n<li>Heavy-duty power supply<\/li>\n<li>Built-in IMDOS operating system (CP\/M variant), with BASIC and FORTRAN IV support<\/li>\n<li>Fully assembled desktop cabinet<\/li>\n<li><strong>Weight<\/strong>: 46 kg (103 lbs)<\/li>\n<\/ul>\n<h3>Operating System &amp; Programming Languages<\/h3>\n<ul>\n<li><strong>OS<\/strong>: IMDOS, a multi-disk operating system that was IMSAI\u2019s enhanced and customized version of CP\/M, supplied with every system<\/li>\n<li><strong>Programming Languages<\/strong>: BASIC (interactive and compiler versions, such as BASIC-E and CBASIC), FORTRAN IV (Level 2 ANSI compiler), Assembly language (8085 assembler and dynamic software debugging tools), Additional utilities for software development and diagnostics were included with IMDOS<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-large wp-image-21381\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-400x300.jpg\" alt=\"IMSAI VDP-80\" width=\"400\" height=\"300\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250620_134530620-360x270.jpg 360w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/li>\n<\/ul>\n<h3>Notables<\/h3>\n<ul>\n<li>It was one of the first fully assembled, turnkey microcomputers aimed at business and professional users, integrating CPU, RAM, dual 8-inch floppy drives, a 12-inch CRT, and a sophisticated keyboard in a single desktop cabinet.<\/li>\n<li>The VDP-80&#8217;s CPU was the Intel 8085 which was Intel&#8217;s second generation of CPU&#8217;s; in 2025 Intel has released it&#8217;s 15th generation CPU<\/li>\n<li>The IMSAI VDP-80 could dynamically switch its floppy disk controller between single and double density to support multiple IBM disk formats simultaneously, a rare feature for its time.<\/li>\n<li>The VDP-80 could serve as an intelligent terminal for distributed data processing or as a standalone business computer, making it versatile for both local and remote computing tasks.<\/li>\n<li>The VDP-80 was sometimes called a &#8220;Video Data Processor,&#8221; highlighting its integrated display and data processing focus.<\/li>\n<li>Despite its technical strengths, the VDP-80 sold poorly due to its high price and heavy weight, and it was quickly outpaced by more affordable and user-friendly competitors like the Apple II and TRS-80.<\/li>\n<li>IMSAI as a brand is legendary in the vintage computing world because the earlier IMSAI 8080 was the first major &#8220;clone&#8221; of the Altair 8800, helping to establish the S-100 bus as a microcomputer standard and making personal computing more accessible.<\/li>\n<li>The IMSAI 8080 famously appeared in the movie &#8220;WarGames&#8221; (1983), cementing its place in pop culture and inspiring a generation of computer enthusiasts.<\/li>\n<li>IMSAI&#8217;s pioneering use of CP\/M (and later IMDOS) contributed to CP\/M&#8217;s rise as the de facto standard operating system for early microcomputers<\/li>\n<li>There is a lot of IMSAI lore and apparently management found the cases for this computer in bulk for a discounted rate and the Engineers had to make them work for this all-in-one design. The case had so little air flow that many systems overheated and broke &#8211; yikes.<\/li>\n<\/ul>\n<p><strong>Donated by<\/strong>: Dr. Arlen Michaels<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imsai VDP-80 [Vin112] The IMSAI VDP-80, released in 1977, was a pioneering all-in-one microcomputer notable for integrating a 3 MHz Intel 8085 processor, 32K or 64K RAM, dual 8-inch floppy drives, a 12-inch video display, and a full alphanumeric keyboard with advanced features like N-key rollove all within a single desktop cabinet. Its claim to [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"parent":19704,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","_mi_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Imsai VDP-80 - School of Computer Science<\/title>\n<meta name=\"description\" content=\"Imsai VDP-80 The IMSAI VDP-80, released in 1977, was a pioneering all-in-one microcomputer notable for integrating a 3 MHz Intel 8085 processor, 32K or\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin112\/\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin112\/\",\"url\":\"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin112\/\",\"name\":\"Imsai VDP-80 - 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