{"id":5635,"date":"2021-11-12T16:25:02","date_gmt":"2021-11-12T16:25:02","guid":{"rendered":"http:\/\/loadzx.com\/loadvisitorguide\/?page_id=5635"},"modified":"2021-12-07T03:34:05","modified_gmt":"2021-12-07T03:34:05","slug":"en-c30125","status":"publish","type":"page","link":"https:\/\/loadzx.com\/loadvisitorguide\/en-c30125\/","title":{"rendered":"30125 &#8211; ZX-81 [EN]"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"5635\" class=\"elementor elementor-5635\">\n\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-4bd9efd elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"47226\" data-id=\"4bd9efd\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1c81ffa\" data-eae-slider=\"12289\" data-id=\"1c81ffa\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0667f4b elementor-widget elementor-widget-heading\" data-id=\"0667f4b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Visit Guide<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-12d8028 elementor-section-items-top elementor-section-content-middle elementor-section-height-min-height elementor-section-boxed elementor-section-height-default\" data-eae-slider=\"76928\" data-id=\"12d8028\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-12 elementor-top-column elementor-element elementor-element-c809e78\" data-eae-slider=\"71484\" data-id=\"c809e78\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-32c52dd elementor-widget elementor-widget-heading\" data-id=\"32c52dd\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"headCurPage\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">NNNNN<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-12 elementor-top-column elementor-element elementor-element-6f3f132\" data-eae-slider=\"59984\" data-id=\"6f3f132\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-12 elementor-top-column elementor-element elementor-element-0a92f4a\" data-eae-slider=\"57171\" data-id=\"0a92f4a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fd3f5f3 elementor-widget elementor-widget-html\" data-id=\"fd3f5f3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<label for=\"textNumberPage\"><\/label>\r\n\r\n<input type=\"text\" id=\"textNumberPage\" name=\"textNumberPage\" required\r\n       minlength=\"1\" maxlength=\"5\" size=\"5\" style=\"font-size: 8px; max-width:200px;height: 24px;\">\r\n \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-12 elementor-top-column elementor-element elementor-element-9c32c8d\" data-eae-slider=\"92441\" data-id=\"9c32c8d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d782bd6 elementor-button-success elementor-align-left elementor-widget elementor-widget-button\" data-id=\"d782bd6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-xs\" href=\"https:\/\/loadzx.com\/loadvisitorguide\/pt-c1\" id=\"numberPageGo\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">GO<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-12 elementor-top-column elementor-element elementor-element-0e5e508\" data-eae-slider=\"86522\" data-id=\"0e5e508\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4d38132 elementor-button-success elementor-align-left elementor-widget elementor-widget-button\" data-id=\"4d38132\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-xs\" href=\"https:\/\/loadzx.com\/loadvisitorguide\/C1\" id=\"headJumpFirst\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">#1<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-12 elementor-top-column elementor-element elementor-element-42ffb20\" data-eae-slider=\"39922\" data-id=\"42ffb20\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-inner-section elementor-element elementor-element-603de4d elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"68993\" data-id=\"603de4d\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-0324804\" data-eae-slider=\"97578\" data-id=\"0324804\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e34301e elementor-align-right elementor-widget elementor-widget-button\" data-id=\"e34301e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/loadzx.com\/loadvisitorguide\/tvcontents\/pt\/C1\" id=\"ptLink\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">PT<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-203e05a\" data-eae-slider=\"79038\" data-id=\"203e05a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-219a9fc elementor-align-center elementor-widget elementor-widget-button\" data-id=\"219a9fc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/loadzx.com\/loadvisitorguide\/tvcontents\/en\/C1\" id=\"enLink\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">EN<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-d72851a\" data-eae-slider=\"34523\" data-id=\"d72851a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7626cf0 elementor-align-left elementor-widget elementor-widget-button\" data-id=\"7626cf0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/loadzx.com\/loadvisitorguide\/tvcontents\/es\/C1\" id=\"esLink\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">ES<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-12 elementor-top-column elementor-element elementor-element-1b172b7 elementor-hidden-phone\" data-eae-slider=\"31240\" data-id=\"1b172b7\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-12 elementor-top-column elementor-element elementor-element-6ad8120\" data-eae-slider=\"23342\" data-id=\"6ad8120\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9b8cc7d elementor-widget elementor-widget-image\" data-id=\"9b8cc7d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"300\" height=\"133\" src=\"https:\/\/loadzx.com\/loadvisitorguide\/wp-content\/uploads\/2020\/03\/logo_LOAD_cor_invertido-smaller_borders-300x133.png\" class=\"attachment-medium size-medium 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class=\"has_eae_slider elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-b8e6c10\" data-eae-slider=\"52208\" data-id=\"b8e6c10\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-bf596d4 elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"bf596d4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/loadzx.com\/loadvisitorguide\/c1\" id=\"previousNavigation\">\n\t\t\t<i aria-hidden=\"true\" class=\"fas fa-arrow-alt-circle-left\"><\/i>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-95ae447\" data-eae-slider=\"23439\" data-id=\"95ae447\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-17b9aea\" data-eae-slider=\"16061\" data-id=\"17b9aea\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-033f518 elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"033f518\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<a class=\"elementor-icon\" href=\"https:\/\/loadzx.com\/loadvisitorguide\/c4\" id=\"nextNavigation\">\n\t\t\t<i aria-hidden=\"true\" class=\"fas fa-arrow-alt-circle-right\"><\/i>\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-top-section elementor-element elementor-element-acda2f3 elementor-section-stretched elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"77876\" data-id=\"acda2f3\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;stretch_section&quot;:&quot;section-stretched&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fd34f7d\" data-eae-slider=\"87791\" data-id=\"fd34f7d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"has_eae_slider elementor-section elementor-inner-section elementor-element elementor-element-5dbb992 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-eae-slider=\"78462\" data-id=\"5dbb992\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-fd1e495\" data-eae-slider=\"21321\" data-id=\"fd1e495\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0d7cb1d elementor-widget elementor-widget-heading\" data-id=\"0d7cb1d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">SINCLAIR ZX81<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4fd5a39 elementor-widget elementor-widget-text-editor\" data-id=\"4fd5a39\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Aiming to reduce the complexity and cost of production of the ZX80, Jim Westwood and his peers had the brilliant idea of combining numerous circuits that were part of the Zx80 into a single circuit called ULA (Uncommitted Logic Array), which was developed by the Ferranti company. The ZX81 first hit the market with only 4 integrated circuits and is considered by Sir Clive Sinclair to be a masterpiece and one of his most iconic computers, even though it still had a black and white screen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a37c024 elementor-widget elementor-widget-text-editor\" data-id=\"a37c024\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Its ROM was manufactured by the Nine Tiles company (as had been the one for the ZX80), namely by John Grant and Steve Vickers. It was the first of its\u2019 kind to be able to handle trigonometric and floating-point operations. This was also the first time the BASIC code validation was made at the same time it was being written, a revolutionary thing at the time.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-96ba812 elementor-widget elementor-widget-text-editor\" data-id=\"96ba812\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>It had a huge commercial success, having sold over 1.5 million units after its release in 1981. It could be bought both in a kit or already assembled. It was manufactured by TIMEX at the Dundee branch (Scotland). There are version with slight changes that were sold in the USA and France (for instance), as well the Timex Sinclair 1000 clone.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-507777f elementor-widget elementor-widget-text-editor\" data-id=\"507777f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>Curiosities: <\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c4903af elementor-widget elementor-widget-text-editor\" data-id=\"c4903af\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>Some of the ULA versions have a \u201csquare-root\u201d bug which made the number for the square root of 0.25 to be incorrect. At a later time correction to this problem were developed, turning all the many boards into collectors items.<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9af3ce6 elementor-widget elementor-widget-spacer\" data-id=\"9af3ce6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Visit Guide NNNNN GO #1 PT EN ES SINCLAIR ZX81 Aiming to reduce the complexity and cost of production of the ZX80, Jim Westwood and his peers had the brilliant idea of combining numerous circuits that were part of the Zx80 into a single circuit called ULA (Uncommitted Logic Array), which was developed by the 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