{"id":20396,"date":"2025-01-20T13:50:26","date_gmt":"2025-01-20T18:50:26","guid":{"rendered":"https:\/\/carleton.ca\/scs\/?page_id=20396"},"modified":"2026-03-20T13:56:14","modified_gmt":"2026-03-20T17:56:14","slug":"vin34","status":"publish","type":"page","link":"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin34\/","title":{"rendered":"Heathkit H-100"},"content":{"rendered":"<h2>Heathkit H-100<\/h2>\n<p>[vin34]<\/p>\n<p>The Heathkit-Zenith Z-110, introduced in 1982, was notable for its dual-processor architecture (Intel 8085 and 8088), allowing it to run both CP\/M and a version of MS-DOS called Z-DOS, and for its advanced graphics capabilities, which surpassed many contemporaries and made it popular for early CAD applications. Its claim to fame was its versatility, expandability (with S-100 slots), and its position as a bridge between the kit-computer era and factory-assembled personal computers, reflecting a shift in the home and business computing markets. While it was quite popular in the US, especially in educational and business settings.<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-large wp-image-23917\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-400x300.jpg\" alt=\"Heathkit H-100\" width=\"400\" height=\"300\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260318_190312478-360x270.jpg 360w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<ul>\n<li><strong>Manufacturer<\/strong>: Heathkit (kit version), later sold assembled by Zenith Data Systems<\/li>\n<li><strong>Release Date<\/strong>: 1982<\/li>\n<li><strong>Type<\/strong>: Desktop Computer<\/li>\n<li>Model: H-100-I (Kit version of Z-100)<\/li>\n<li><strong>Cost at release<\/strong>: USD $3,499 (CAD ~$12,800 adjusted for inflation)<\/li>\n<li><strong>Cost with peripherals<\/strong>: USD $5,499 (CAD ~$20,000 adjusted for inflation)<\/li>\n<li><strong>MIPS<\/strong>: 0.37 (370 KIPS)<\/li>\n<\/ul>\n<p><\/p>\n<h3><span class=\"TextRun SCXW36078203 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW36078203 BCX0\">Hardware Specifications<\/span><\/span><\/h3>\n<ul class=\"marker:text-textOff list-disc pl-8\">\n<li><strong>CPU<\/strong>: Dual 8085 and 8088<\/li>\n<li><strong>Memory<\/strong>: 128 KB, expandable to 192 KB on the mainboard and up to 768 KB using S-100 expansion cards.<\/li>\n<li><strong>Storage<\/strong>: Two 320 KB 5.25-inch floppy disk drives<\/li>\n<li><strong>Display<\/strong>: 640\u00d7225 pixel bitmap display, supporting 8 colors (low-profile model) or up to 8-level greyscale (all-in-one model); advanced graphics for its era.<\/li>\n<li><strong>Video RAM<\/strong>: Up to 64 KB dedicated for graphics.<\/li>\n<li><strong>Expansion<\/strong>: Five S-100\/IEEE-696 expansion slots for peripherals and additional memory.<\/li>\n<li><strong>Ports<\/strong>: Two RS-232 serial ports, one Centronics parallel printer port, and a light pen port.<\/li>\n<li><strong>Power<\/strong>: 300-watt switching power supply.<\/li>\n<\/ul>\n<h3><span class=\"TextRun SCXW136206418 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW136206418 BCX0\">Operating System &amp; Programming Languages<\/span><\/span><span class=\"EOP SCXW136206418 BCX0\" data-ccp-props=\"{&quot;335559685&quot;:0}\">\u00a0<\/span><\/h3>\n<ul class=\"marker:text-textOff list-disc\">\n<li>\n<p class=\"my-0\"><strong>Operating System<\/strong>:<\/p>\n<ul class=\"marker:text-textOff list-disc\">\n<li>Z-DOS (a non-IBM compatible version of MS-DOS, sometimes simply called &#8220;Zenith&#8217;s version of MS-DOS&#8221;)<\/li>\n<li>CP\/M-85 (for the 8085 processor) and CP\/M-86 (for the 8088 processor).<\/li>\n<li>Concurrent CP\/M-86 and UCSD Pascal<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"my-0\"><strong>Supported Languages<\/strong>:<\/p>\n<ul class=\"marker:text-textOff list-disc\">\n<li>\n<p class=\"my-0\">Microsoft BASIC (BASIC-80 for CP\/M-80, Z-BASIC for Z-DOS)<\/p>\n<\/li>\n<li>\n<p class=\"my-0\">Microsoft FORTRAN-86 (for Z-DOS)<\/p>\n<\/li>\n<li>\n<p class=\"my-0\">Microsoft COBOL-86 (for Z-DOS)<\/p>\n<\/li>\n<li>\n<p class=\"my-0\">Microsoft Pascal (for both CP\/M and Z-DOS)<\/p>\n<\/li>\n<li>\n<p class=\"my-0\">Microsoft BASCOM-86 (for Z-DOS)<\/p>\n<\/li>\n<li>\n<p class=\"my-0\">Assembly language (with available assemblers and editors for CP\/M and Z-DOS environments)<\/p>\n<\/li>\n<li>\n<p class=\"my-0\">UCSD Pascal and other languages available for CP\/M systems<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Notables<\/h3>\n<ul>\n<li>The Z-110 was nicknamed the &#8220;low-profile&#8221; model of the Z-100 series, designed without an internal monitor for flexibility and compactness.<\/li>\n<li>It featured a rare dual-processor setup (Intel 8085 and 8088), allowing it to run both CP\/M and a non-IBM compatible version of MS-DOS (Z-DOS), which was unusual for its time.<\/li>\n<li>Its graphics capabilities were advanced, supporting 640\u00d7225 resolution with 8 colors-superior to IBM\u2019s CGA and even rivaling the Hercules Graphics Card-making it popular for early CAD and graphics applications.<\/li>\n<li>The Z-110 used the S-100 bus, a hallmark of earlier hobbyist systems, but was sold both as a kit (Heathkit) and pre-assembled (Zenith), bridging the gap between DIY and commercial PCs.<\/li>\n<li>While not fully IBM PC compatible, it could run some generic MS-DOS software, and third-party solutions existed to improve compatibility.<\/li>\n<li>Its place in computing history is as a transitional machine: robust, versatile, and influential in both educational and professional settings during the early 1980s<\/li>\n<\/ul>\n<p><strong>Donated by<\/strong>: Dr. Arlen Michaels<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Heathkit H-100 [vin34] The Heathkit-Zenith Z-110, introduced in 1982, was notable for its dual-processor architecture (Intel 8085 and 8088), allowing it to run both CP\/M and a version of MS-DOS called Z-DOS, and for its advanced graphics capabilities, which surpassed many contemporaries and made it popular for early CAD applications. Its claim to fame was [&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>Heathkit H-100 - School of Computer Science<\/title>\n<meta name=\"description\" content=\"Heathkit H-100 The Heathkit-Zenith Z-110, introduced in 1982, was notable for its dual-processor architecture (Intel 8085 and 8088), allowing it to run\" \/>\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\/vin34\/\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 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\/vin34\/\",\"url\":\"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin34\/\",\"name\":\"Heathkit H-100 - 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