{"id":21576,"date":"2025-07-08T13:52:27","date_gmt":"2025-07-08T17:52:27","guid":{"rendered":"https:\/\/carleton.ca\/scs\/?page_id=21576"},"modified":"2025-08-11T17:03:16","modified_gmt":"2025-08-11T21:03:16","slug":"vin73","status":"publish","type":"page","link":"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin73\/","title":{"rendered":"Texas Instruments TI-99\/4A"},"content":{"rendered":"<h2>Texas Instruments TI-99\/4A<\/h2>\n<p>[Vin73]<\/p>\n<p>The Texas Instruments TI-99\/4A, launched in 1981, was the world\u2019s first 16-bit home computer, notable for its advanced TMS9900 processor, color graphics, and pioneering speech synthesis peripheral. Its claim to fame lies in introducing 16-bit technology to the home market, influencing later computer architectures and setting a new standard for multimedia capabilities in personal computing. Despite intense competition and a dramatic price war, the TI-99\/4A achieved remarkable popularity with over 2.8 million units sold, becoming a staple in North American households and classrooms.<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-large wp-image-21582\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-400x300.jpg\" alt=\"Texas Instruments TI-99\/4A\" width=\"400\" height=\"300\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250708_181714911-360x270.jpg 360w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<ul>\n<li><strong>Manufacturer<\/strong>: Texas Instruments<\/li>\n<li><strong>Released<\/strong>: 1981<\/li>\n<li><strong>Type<\/strong>: Home Computer<\/li>\n<li><strong>Cost at release<\/strong>: USD $525 (CAD ~$2,000 adjusted for inflation)<\/li>\n<li><strong>Cost with peripherals<\/strong>: USD $2,000 (CAD ~$7,850 adjusted for inflation<\/li>\n<li><strong>MIPS<\/strong>: 0.136 (136 KIPS)<\/li>\n<\/ul>\n<h3><span class=\"NormalTextRun SCXW169789978 BCX0\">Hardware Specifications<\/span><\/h3>\n<ul>\n<li><strong>CPU<\/strong>: Texas Instruments TMS9900, 16-bit, running at 3 MHz<\/li>\n<li><strong>RAM<\/strong>: 256 bytes scratchpad RAM (CPU), 16 KB Video Display Processor (VDP) RAM, expandable up to 52 KB with expansion cards<\/li>\n<li><strong>ROM<\/strong>: 8 KB system ROM, 18 KB GROM (Graphic ROM) for TI BASIC and OS support<\/li>\n<li><strong>Graphics<\/strong>: TMS9918A VDP, supporting 256 \u00d7 192 pixel graphics mode (up to 16 colors)<\/li>\n<li><strong>Sound<\/strong>: TMS9919 sound chip, 3 sound channels plus 1 noise channel (white or periodic), square wave generation from 110 Hz to ~115 kHz<\/li>\n<li><strong>Keyboard<\/strong>: Full-stroke QWERTY keyboard, 48 keys with function, shift, and control keys<\/li>\n<li><strong>Expansion<\/strong>: Cartridge slot for software, Peripheral Expansion Box (PEB) for memory, disk drives, RS-232, and more<\/li>\n<li><strong>I\/O Ports<\/strong>: Cassette interface, video output (RF modulator), joystick ports (2), cartridge slot<\/li>\n<li><strong>Weight<\/strong>: 2.15 kg (4.74 lbs)<\/li>\n<\/ul>\n<p><\/p>\n<h3><span class=\"TextRun SCXW50331614 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW50331614 BCX0\">Operating System &amp; Programming Languages<\/span><\/span><span class=\"EOP SCXW50331614 BCX0\" data-ccp-props=\"{&quot;335559685&quot;:0}\">\u00a0<\/span><\/h3>\n<ul>\n<li><strong>Operating System<\/strong>:\n<ul>\n<li>The TI-99\/4A ran a built-in, ROM-based console operating system that managed hardware resources and provided the user interface.<\/li>\n<li>Its primary user environment was TI BASIC, an ANSI-compliant BASIC interpreter integrated into the system ROM, which acted as both the default operating system shell and programming interface.<\/li>\n<li>Alternative operating systems included UCSD p-System (via a peripheral card), which provided a Pascal-oriented environment, and various third-party disk operating systems for advanced users<\/li>\n<\/ul>\n<\/li>\n<li><strong>Programming Languages<\/strong>:\n<ul>\n<li>TI BASIC (built-in): The default language, based on Dartmouth BASIC, for general programming and learning.<\/li>\n<li>TI Extended BASIC: An enhanced cartridge-based version offering more commands, structured programming features, and improved graphics and sound support.<\/li>\n<li>Assembly Language: Programmable via the Editor\/Assembler cartridge and expansion memory, allowing direct access to the TMS9900 CPU.<\/li>\n<li>GPL (Graphics Programming Language): An internal bytecode language used for system routines and some cartridges.<\/li>\n<li>LOGO: Available via cartridge for educational and graphical programming.<\/li>\n<li>Forth: Supported through third-party cartridges for more advanced, stack-based programming.<\/li>\n<li>Pascal: UCSD Pascal was available with the UCSD p-System card, providing a structured, high-level language environment.<\/li>\n<li>FORTRAN: Supported via third-party software for scientific and engineering applications.<\/li>\n<li>Other Languages: Additional options included My Little Compiler (MLC), TML (The Missing Link), and various third-party BASIC dialects and compilers<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-medium wp-image-21995\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-240x180.jpg\" alt=\"Texas Instruments TI-99\" width=\"240\" height=\"180\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20250811_183210695-360x270.jpg 360w\" sizes=\"(max-width: 240px) 100vw, 240px\" \/><\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Notables<\/h3>\n<ul>\n<li>First 16-Bit Home Computer: The TI-99\/4A was the world\u2019s first 16-bit home computer, using the TMS9900 CPU originally designed for minicomputers.<\/li>\n<li>Speech Synthesis Pioneer: It was among the first home computers to offer a speech synthesizer peripheral, enabling games and educational software to &#8220;talk&#8221; to users.<\/li>\n<li>Daisy-Chained Expansion: Peripherals connected in a daisy-chain from the side, resulting in a famously long, unwieldy row of add-ons when fully expanded.<\/li>\n<li>Solid State Software: TI branded its ROM cartridges as \u201cSolid State Software,\u201d a term unique to their marketing.<\/li>\n<li>Market Price War: The TI-99\/4A was central to a fierce price war with Commodore, leading to dramatic price drops from $525 to under $100, and ultimately selling at a loss.<\/li>\n<li>\u201cPlug and Play\u201d Hardware: The system featured early plug-and-play capabilities with its cartridge and peripheral support.<\/li>\n<li>Limited Third-Party Software: TI tightly controlled software development, resulting in a limited library compared to competitors<\/li>\n<\/ul>\n<p><strong>Donated By<\/strong>: Arlen Michaels<\/p>\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Texas Instruments TI-99\/4A [Vin73] The Texas Instruments TI-99\/4A, launched in 1981, was the world\u2019s first 16-bit home computer, notable for its advanced TMS9900 processor, color graphics, and pioneering speech synthesis peripheral. Its claim to fame lies in introducing 16-bit technology to the home market, influencing later computer architectures and setting a new standard for multimedia [&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>Texas Instruments TI-99\/4A - 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