{"id":20456,"date":"2025-01-22T14:32:05","date_gmt":"2025-01-22T19:32:05","guid":{"rendered":"https:\/\/carleton.ca\/scs\/?page_id=20456"},"modified":"2026-01-09T20:49:52","modified_gmt":"2026-01-10T01:49:52","slug":"vin47","status":"publish","type":"page","link":"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin47\/","title":{"rendered":"Zenith H89 (AMI Phoenix 1)"},"content":{"rendered":"<h2>Zenith H89 (AMI Phoenix 1)<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-medium wp-image-20435\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821-240x213.png\" alt=\"Carleton U Logo\" width=\"240\" height=\"213\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821-240x213.png 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821-400x355.png 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821-160x142.png 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821-768x682.png 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821-1536x1363.png 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821-2048x1818.png 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/B_Logo_V-RGBRedBlackonLight150_130821-360x320.png 360w\" sizes=\"(max-width: 240px) 100vw, 240px\" \/><\/a><\/h2>\n<p>The Zenith H89 (also known as the Heathkit H89 or AMI Phoenix 1) was a notable late-1970s all-in-one personal computer that combined the functions of a microcomputer and terminal in a single, integrated enclosure, featuring a built-in 12-inch monochrome CRT, a high-quality keyboard, and a 5.25&#8243; floppy disk drive, all powered by a Zilog Z80 processor. Its claim to fame was its versatility: it could run both the CP\/M and HDOS operating systems, supported significant expansion options, and was available as both a kit (Heathkit H89) and a fully assembled unit (Zenith Z-89), making it accessible to hobbyists and small businesses alike at a time when most computers required separate terminals and external storage. While it was not as popular as contemporaries like the Commodore 64 or Apple II due to its higher price and niche appeal, it had a strong following among enthusiasts and professionals, and was supported in Canada with service centers in major cities including Ottawa, Toronto, and Montreal, reflecting its presence in the Canadian market. Carleton Universities faculty of Engineering used this unit.<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-large wp-image-23146\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-400x300.jpg\" alt=\"Zenith H89 (AMI Phoenix 1)\" width=\"400\" height=\"300\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260109_153208826-360x270.jpg 360w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<ul>\n<li><strong>Manufacturer<\/strong>: Heath Company and later produced and marketed by Zenith Data Systems (ZDS) after Zenith acquired Heath in 1979<\/li>\n<li><strong>Type<\/strong>: All-in-one personal computer<\/li>\n<li><strong>Release Date<\/strong>: 1979<\/li>\n<li><strong>Cost at release<\/strong>: A typical assembled system with peripherals (including floppy drive, serial I\/O, and software) was around $2,295 USD (CAD $10,000 adjusted for inflation)<\/li>\n<li><strong>MIPS<\/strong>: 0.58 (580 KIPS)<\/li>\n<\/ul>\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>\n<li><strong>CPU<\/strong>: Zilog Z80A CPU running at 2.048 MHz<\/li>\n<li><strong>Memory<\/strong>: 16 KB (expandable to 48 KB or 64 KB)<\/li>\n<li><strong>Display<\/strong>: Built-in 12-inch monochrome CRT display (80 columns x 25 lines text)<\/li>\n<li><strong>Storage<\/strong>: 5.25-inch floppy disk drive (single-sided, 100 KB capacity; dual drive optional). Optional hard disk support (with expansion).<\/li>\n<li><strong>Ports<\/strong>: Serial and parallel ports for external peripherals<\/li>\n<li><strong>Case<\/strong>: All-in-one enclosure (computer, monitor, and keyboard in a single unit)<\/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>\n<li class=\"my-0\"><strong>Operating System<\/strong>:\n<ul>\n<li>HDOS (Heathkit Disk Operating System)<\/li>\n<li>CP\/M (Control Program for Microcomputers)<\/li>\n<li>UCSD p-System (less common, but available)<\/li>\n<\/ul>\n<\/li>\n<li><strong>Supported Languages<\/strong>:\n<ul>\n<li>BASIC (including Microsoft BASIC)<\/li>\n<li>FORTRAN (Microsoft FORTRAN)<\/li>\n<li>Assembly language (Z80\/8080 assembler)<\/li>\n<li>C (via CP\/M compilers)<\/li>\n<li>Pascal (via UCSD p-System and CP\/M Pascal compilers)<\/li>\n<li>Other CP\/M-compatible languages (such as COBOL, PL\/I, and more, depending on available software)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Notables<\/h3>\n<ul>\n<li>The H89 was one of the first all-in-one personal computers, integrating the monitor, keyboard, and floppy drive in a single enclosure, which was unusual at the time.<\/li>\n<li>It was originally sold in kit form by Heathkit (as the H89) and later as a fully assembled system by Zenith Data Systems (as the Z-89) after Zenith acquired Heathkit.<\/li>\n<li>the \u201cAMI\u201d reference denotes American Megatrends Incorporated, whose BIOS Phoenix 1 firmware provided reliable system initialization and hardware compatibility, a notable early example of BIOS standardization.<\/li>\n<li>The system could function both as a standalone computer and as a terminal, and featured a secondary Z80 processor dedicated to terminal operations.<\/li>\n<li>It had a highly expandable architecture, with internal card cages for additional RAM, disk controllers, and serial ports, and could be upgraded with faster CPUs and larger storage options.<\/li>\n<li>The keyboard was notable for its high build quality and an unusually large number of special-purpose keys, including color-coded function keys and a numeric keypad.<\/li>\n<li>The H89\/Z-89 was sometimes affectionately referred to by enthusiasts as the &#8220;Heathkit all-in-one&#8221; or simply &#8220;the H89&#8221;.<\/li>\n<li>Its professional appearance and expandability made it popular among hobbyists, educators, and small businesses, but its high price kept it niche compared to mass-market home computers like the Apple II or Commodore 64.<\/li>\n<li>The Z-89\u2019s cabinet design became iconic and is still recognized among vintage computer collectors today<\/li>\n<\/ul>\n<p><strong>Donated By<\/strong>: Carleton University&#8217;s Faculty of Engineering<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Zenith H89 (AMI Phoenix 1) The Zenith H89 (also known as the Heathkit H89 or AMI Phoenix 1) was a notable late-1970s all-in-one personal computer that combined the functions of a microcomputer and terminal in a single, integrated enclosure, featuring a built-in 12-inch monochrome CRT, a high-quality keyboard, and a 5.25&#8243; floppy disk drive, all [&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 - 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