{"id":23346,"date":"2026-01-22T15:17:35","date_gmt":"2026-01-22T20:17:35","guid":{"rendered":"https:\/\/carleton.ca\/scs\/?page_id=23346"},"modified":"2026-01-29T08:44:11","modified_gmt":"2026-01-29T13:44:11","slug":"vin159","status":"publish","type":"page","link":"https:\/\/carleton.ca\/scs\/vintage-computing\/item\/vin159\/","title":{"rendered":"Parker Brother&#8217;s Electronic Mastermind"},"content":{"rendered":"<h2>Parker Brother&#8217;s Electronic Mastermind<\/h2>\n<p>[Vin159]<\/p>\n<p>The Parker Electronic Mastermind, released in 1977, stands out in vintage computing history as one of the earliest dedicated electronic code-breaking devices, blending simple microprocessor logic with the popular Mastermind board game concept. This device gained fame as a precursor to programmable handhelds like Parker Brothers&#8217; Merlin (1978), which expanded on its formula with multiple games and outsold it massively at over 5 million units worldwide. It democratized computing concepts: logic deduction and trial-error feedback, making abstract algorithms tangible without screens or cassettes, a pivotal step before home micros like the TRS-80.<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-large wp-image-23350\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-400x533.jpg\" alt=\"Parker Brother's Electronic Mastermind\" width=\"400\" height=\"533\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-400x533.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-240x320.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-160x213.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-768x1023.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-1153x1536.jpg 1153w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-1538x2048.jpg 1538w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-360x479.jpg 360w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_171117793-scaled.jpg 1922w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<ul>\n<li><strong>Manufacturer<\/strong>: Parker Brothers manufactured the Electronic Mastermind, collaborating with Invicta Plastics from the UK for design.<\/li>\n<li><strong>Type<\/strong>: Electronic Toy<\/li>\n<li><strong>Release Date<\/strong>: 1977<\/li>\n<li><strong>Cost at release<\/strong>: $75 (adjusted for inflation)<\/li>\n<li><strong>MIPS<\/strong>: 0.002 (~2 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>: Texas Instruments TMS1000 4-bit microcontroller (mask-programmed ROM, ~1KB program memory, 16&#215;4-bit RAM, 300-400 kHz clock, 0.002-0.005 MIPS).<\/li>\n<li><strong>Display<\/strong>: Custom LED array with red (correct position), green (correct digit wrong position), and black\/off peg indicators; no 7-segment digits,<\/li>\n<li><strong>Input<\/strong>: Numeric keypad (0-9) for code entry, mode switches for 3\/4\/5-digit games, reset button<\/li>\n<li><strong>Power<\/strong>: 9V battery<span class=\"inline-flex\" aria-label=\"Electronic Mastermind\" data-state=\"closed\">\u200b<\/span><\/li>\n<li><strong>Memory\/Storage<\/strong>: Fixed ROM-only for game logic; no expandable RAM or peripherals.<\/li>\n<li><strong>Build<\/strong>: Injection-molded plastic case made in Hong Kong.<span class=\"inline-flex\" aria-label=\"Electronic Mastermind\" data-state=\"closed\">\u200b<\/span><\/li>\n<li><strong>Dimensions<\/strong>: Handheld ~15x8x2 cm<\/li>\n<li><strong>Weight<\/strong>: ~280 grams<\/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>: The Parker Electronic Mastermind had no operating system, as it ran a fixed mask-programmed ROM on the TMS1000 microcontroller with no support for loading or switching software.<\/p>\n<\/li>\n<li>\n<p class=\"my-0\"><strong>Supported Languages<\/strong>: The TMS1000 executed proprietary 8-bit machine code instructions (43-54 opcodes optimized for BCD arithmetic, branching, and I\/O), hardcoded by TI during manufacturing for this game&#8217;s code-breaking logic. No high-level computer languages like BASIC, FORTRAN, or assembly were runnable by end-users; developers used TI&#8217;s custom assembly tools to generate ROM masks pre-production.<\/p>\n<\/li>\n<\/ul>\n<h3>Notables<a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-large wp-image-23351\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-400x300.jpg\" alt=\"Mastermind TMC1000 chip\" width=\"400\" height=\"300\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_164707105-360x270.jpg 360w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a><\/h3>\n<ul>\n<li>Firsts: Among the earliest toys to embed a commercial microcontroller (TMS1000, released 1974), predating Merlin&#8217;s multi-game fame and introducing code-breaking logic to mass markets.<\/li>\n<li>Mask-programmed ROM made it unhackable by users<\/li>\n<li>Pioneered affordable embedded systems for toys, sparking 1970s fascination with &#8220;thinking machines&#8221; before home PCs; sold modestly vs. Merlin&#8217;s 5M+ units but influenced educational logic games.<\/li>\n<\/ul>\n<p><strong>Donated by<\/strong>: Andrew Miles<\/p>\n<p><a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignleft size-full wp-image-23353\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-scaled.jpg\" alt=\"Parker Brother's Electronic Mastermind\" width=\"2560\" height=\"1922\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-scaled.jpg 2560w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/PXL_20260122_204806701-360x270.jpg 360w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Parker Brother&#8217;s Electronic Mastermind [Vin159] The Parker Electronic Mastermind, released in 1977, stands out in vintage computing history as one of the earliest dedicated electronic code-breaking devices, blending simple microprocessor logic with the popular Mastermind board game concept. This device gained fame as a precursor to programmable handhelds like Parker Brothers&#8217; Merlin (1978), which expanded [&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>Parker Brother&#039;s Electronic Mastermind - 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