{"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":"2026-06-22T14:40:46","modified_gmt":"2026-06-22T18:40:46","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":"\n<section class=\"w-screen px-6 cu-section cu-section--white ml-offset-center md:px-8 lg:px-14\">\n    <div class=\"space-y-6 cu-max-w-child-5xl  md:space-y-10 cu-prose-first-last\">\n\n            <div class=\"cu-textmedia flex flex-col lg:flex-row mx-auto gap-6 md:gap-10 my-6 md:my-12 first:mt-0 max-w-5xl\">\n        <div class=\"justify-start cu-textmedia-content cu-prose-first-last\" style=\"flex: 0 0 100%;\">\n            <header class=\"font-light prose-xl cu-pageheader md:prose-2xl cu-component-updated cu-prose-first-last\">\n                                    <h1 class=\"cu-prose-first-last font-semibold !mt-2 mb-4 md:mb-6 relative after:absolute after:h-px after:bottom-0 after:bg-cu-red after:left-px text-3xl md:text-4xl lg:text-5xl lg:leading-[3.5rem] pb-5 after:w-10 text-cu-black-700 not-prose\">\n                        Parker Brother&#8217;s Electronic Mastermind\n                    <\/h1>\n                \n                                \n                            <\/header>\n\n                    <\/div>\n\n            <\/div>\n\n    <\/div>\n<\/section>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/carleton.ca\/scs\/vintage-computing\/item\">Vintage Computing Collection<\/a><\/div>\n<\/div>\n\n\n\n<h2 id=\"parker-brothers-electronic-mastermind\" class=\"wp-block-heading\">Parker Brother&#8217;s Electronic Mastermind<\/h2>\n\n\n\n<p>[Vin159]<\/p>\n\n\n\n<figure class=\"wp-block-image alignright\"><a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"533\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-400x533.jpg\" alt=\"Parker Brother's Electronic Mastermind\" class=\"wp-image-23350\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-400x533.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-160x213.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-240x320.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-768x1023.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-1153x1536.jpg 1153w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-1538x2048.jpg 1538w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_171117793-360x479.jpg 360w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/figure>\n\n\n\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.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Manufacturer<\/strong>: Parker Brothers manufactured the Electronic Mastermind, collaborating with Invicta Plastics from the UK for design.<\/li>\n\n\n\n<li><strong>Type<\/strong>: Electronic Toy<\/li>\n\n\n\n<li><strong>Release Date<\/strong>: 1977<\/li>\n\n\n\n<li><strong>Cost at release<\/strong>: $75 (adjusted for inflation)<\/li>\n\n\n\n<li><strong>MIPS<\/strong>: 0.002 (~2 KIPS)<\/li>\n<\/ul>\n\n\n\n<h3 id=\"hardware-specifications\" class=\"wp-block-heading\"><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\n\n\n<ul class=\"wp-block-list\">\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\n\n\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\n\n\n<li><strong>Input<\/strong>: Numeric keypad (0-9) for code entry, mode switches for 3\/4\/5-digit games, reset button<\/li>\n\n\n\n<li><strong>Power<\/strong>: 9V battery<span class=\"inline-flex\" aria-label=\"Electronic Mastermind\" data-state=\"closed\">\u200b<\/span><\/li>\n\n\n\n<li><strong>Memory\/Storage<\/strong>: Fixed ROM-only for game logic; no expandable RAM or peripherals.<\/li>\n\n\n\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\n\n\n<li><strong>Dimensions<\/strong>: Handheld ~15x8x2 cm<\/li>\n\n\n\n<li><strong>Weight<\/strong>: ~280 grams<\/li>\n<\/ul>\n\n\n\n<h3 id=\"operating-system-programming-languages\" class=\"wp-block-heading\"><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}\">&nbsp;<\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list marker:text-textOff list-disc\">\n<li><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><\/li>\n\n\n\n<li><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><\/li>\n<\/ul>\n\n\n\n<h3 id=\"notables\" class=\"wp-block-heading\">Notables<figure><a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-large wp-image-23351\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-400x300.jpg\" alt=\"Mastermind TMC1000 chip\" width=\"400\" height=\"300\" srcset=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-400x300.jpg 400w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-160x120.jpg 160w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-240x180.jpg 240w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-768x577.jpg 768w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-1536x1153.jpg 1536w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-2048x1538.jpg 2048w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-800x600.jpg 800w, https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_164707105-360x270.jpg 360w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/figure><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\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\n\n\n<li>Mask-programmed ROM made it unhackable by users<\/li>\n\n\n\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\n\n\n<p><strong>Donated by<\/strong>: Andrew Miles<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_204806701-scaled.jpg\"><img decoding=\"async\" src=\"https:\/\/carleton.ca\/scs\/wp-content\/uploads\/sites\/260\/PXL_20260122_204806701-scaled.jpg\" alt=\"Parker Brother's Electronic Mastermind\" class=\"wp-image-23353\"\/><\/a><\/figure>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/carleton.ca\/scs\/vintage-computing\/item\">Vintage Computing Collection<\/a><\/div>\n<\/div>\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":2,"featured_media":0,"parent":19704,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_cu_dining_location_slug":"","footnotes":"","_links_to":"","_links_to_target":""},"cu_page_type":[133,90,123],"class_list":["post-23346","page","type-page","status-publish","hentry","cu_page_type-electronic-toy","cu_page_type-vintage-computing","cu_page_type-vintage-inventory"],"acf":{"cu_post_thumbnail":""},"_links":{"self":[{"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/pages\/23346","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/comments?post=23346"}],"version-history":[{"count":5,"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/pages\/23346\/revisions"}],"predecessor-version":[{"id":25110,"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/pages\/23346\/revisions\/25110"}],"up":[{"embeddable":true,"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/pages\/19704"}],"wp:attachment":[{"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/media?parent=23346"}],"wp:term":[{"taxonomy":"cu_page_type","embeddable":true,"href":"https:\/\/carleton.ca\/scs\/wp-json\/wp\/v2\/cu_page_type?post=23346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}