{"id":328,"date":"2022-02-20T10:56:05","date_gmt":"2022-02-20T09:56:05","guid":{"rendered":"https:\/\/www.sinclaircollection.site\/?page_id=328"},"modified":"2025-09-09T22:32:40","modified_gmt":"2025-09-09T20:32:40","slug":"sinclair-zx81-usa","status":"publish","type":"page","link":"https:\/\/www.sinclaircollection.site\/?page_id=328","title":{"rendered":"Sinclair ZX81 (USA)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"328\" class=\"elementor elementor-328\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8615e1f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8615e1f\" data-element_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=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4c5f24e\" data-id=\"4c5f24e\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-d1742cb elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d1742cb\" data-element_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=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-0b48410\" data-id=\"0b48410\" data-element_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-efbcabe elementor-widget elementor-widget-image\" data-id=\"efbcabe\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.23.0 - 05-08-2024 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"920\" height=\"920\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-1024x1024.jpg\" class=\"attachment-large size-large wp-image-9265\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-1024x1024.jpg 1024w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-300x300.jpg 300w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-150x150.jpg 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-768x768.jpg 768w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-666x666.jpg 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-96x96.jpg 96w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0.jpg 1504w\" sizes=\"(max-width: 920px) 100vw, 920px\" \/>\t\t\t\t\t\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=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-0382d7b\" data-id=\"0382d7b\" data-element_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-941653b elementor-widget elementor-widget-text-editor\" data-id=\"941653b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.23.0 - 05-08-2024 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>Brand:&nbsp;<strong>Sinclair Research Ltd.<\/strong><br>Model:&nbsp;<strong>ZX81<\/strong><br>Country of origin:&nbsp;<strong>United States of America<\/strong><br>Made in: <b>Scotland<\/b> (Dundee)<br>Launch date:&nbsp;<strong>7 October 1981<\/strong><br>Price: <strong>$149.95 \/ $99.95 (kit)<\/strong><\/p>\n<p>Board design:&nbsp;<span style=\"font-weight: 700;\">Jim Westwood<\/span><b><br><\/b>Software:&nbsp;<b>Steve Vickers<br><\/b>Case design:&nbsp;<span style=\"font-weight: bold;\">Rick Dickinson<\/span><\/p>\n<p>Dimensions:&nbsp;<span style=\"font-weight: bold;\">167 \u00d7 174 \u00d7 40 mm&nbsp;<\/span>(feet adds 2 mm)<br>Weight: <span style=\"font-weight: bold;\">352 g<br><\/span>Box dimensions: <span style=\"font-weight: bold;\">400 \u00d7 240 \u00d7 66 mm<\/span><\/p>\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<div class=\"elementor-element elementor-element-7f07964 elementor-widget elementor-widget-text-editor\" data-id=\"7f07964\" data-element_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<p>More than 25.000 units were sold through a deal with American Express, like this ZX81.<\/p>\n<p><i>(Text continues below the gallery)<\/i><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5d6e69f elementor-widget elementor-widget-image-gallery\" data-id=\"5d6e69f\" data-element_type=\"widget\" data-widget_type=\"image-gallery.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.23.0 - 05-08-2024 *\/\n.elementor-image-gallery .gallery-item{display:inline-block;text-align:center;vertical-align:top;width:100%;max-width:100%;margin:0 auto}.elementor-image-gallery .gallery-item img{margin:0 auto}.elementor-image-gallery .gallery-item .gallery-caption{margin:0}.elementor-image-gallery figure img{display:block}.elementor-image-gallery figure figcaption{width:100%}.gallery-spacing-custom .elementor-image-gallery .gallery-icon{padding:0}@media (min-width:768px){.elementor-image-gallery .gallery-columns-2 .gallery-item{max-width:50%}.elementor-image-gallery .gallery-columns-3 .gallery-item{max-width:33.33%}.elementor-image-gallery .gallery-columns-4 .gallery-item{max-width:25%}.elementor-image-gallery .gallery-columns-5 .gallery-item{max-width:20%}.elementor-image-gallery .gallery-columns-6 .gallery-item{max-width:16.666%}.elementor-image-gallery .gallery-columns-7 .gallery-item{max-width:14.28%}.elementor-image-gallery .gallery-columns-8 .gallery-item{max-width:12.5%}.elementor-image-gallery .gallery-columns-9 .gallery-item{max-width:11.11%}.elementor-image-gallery .gallery-columns-10 .gallery-item{max-width:10%}}@media (min-width:480px) and (max-width:767px){.elementor-image-gallery .gallery.gallery-columns-2 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-3 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-4 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-5 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-6 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-7 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-8 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-9 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-10 .gallery-item{max-width:50%}}@media (max-width:479px){.elementor-image-gallery .gallery.gallery-columns-2 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-3 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-4 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-5 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-6 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-7 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-8 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-9 .gallery-item,.elementor-image-gallery .gallery.gallery-columns-10 .gallery-item{max-width:100%}}<\/style>\t\t<div class=\"elementor-image-gallery\">\n\t\t\t<div id='gallery-1' class='gallery galleryid-328 gallery-columns-5 gallery-size-thumbnail'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Top view\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6OTI2NSwidXJsIjoiaHR0cHM6XC9cL3d3dy5zaW5jbGFpcmNvbGxlY3Rpb24uc2l0ZVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyNFwvMDVcL3p4ODF1cy0wLmpwZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0.jpg'><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-150x150.jpg 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-300x300.jpg 300w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-1024x1024.jpg 1024w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-768x768.jpg 768w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-666x666.jpg 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0-96x96.jpg 96w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/zx81us-0.jpg 1504w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon portrait'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Bottom view\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTc3LCJ1cmwiOiJodHRwczpcL1wvd3d3LnNpbmNsYWlyY29sbGVjdGlvbi5zaXRlXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIyXC8wMlwvNV8yX3p4ODF1c2EtMi5qcGciLCJzbGlkZXNob3ciOiI1ZDZlNjlmIn0%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2022\/02\/5_2_zx81usa-2.jpg'><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2022\/02\/5_2_zx81usa-2-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Boot screen\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTc4LCJ1cmwiOiJodHRwczpcL1wvd3d3LnNpbmNsYWlyY29sbGVjdGlvbi5zaXRlXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIyXC8wMlwvNV80X0RTQ180ODM0LmpwZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2022\/02\/5_4_DSC_4834.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2022\/02\/5_4_DSC_4834-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"My test card\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTc5LCJ1cmwiOiJodHRwczpcL1wvd3d3LnNpbmNsYWlyY29sbGVjdGlvbi5zaXRlXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIyXC8wMlwvNV82X0RTQ180ODM1LmpwZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2022\/02\/5_6_DSC_4835.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2022\/02\/5_6_DSC_4835-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Motherboard\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTA0MjQsInVybCI6Imh0dHBzOlwvXC93d3cuc2luY2xhaXJjb2xsZWN0aW9uLnNpdGVcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA1XC9QaG90b3Jvb20tMjAyNDA1MTNfMDQ0ODQxLnBuZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044841.png'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044841-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044841-150x150.png 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044841-666x666.png 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044841-96x96.png 96w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon portrait'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Motherboard underside with grounding prong\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTA0MjMsInVybCI6Imh0dHBzOlwvXC93d3cuc2luY2xhaXJjb2xsZWN0aW9uLnNpdGVcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA1XC9QaG90b3Jvb20tMjAyNDA1MTNfMDQ0OTQ5LnBuZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044949.png'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044949-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044949-150x150.png 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044949-1015x1024.png 1015w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044949-768x775.png 768w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044949-666x666.png 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044949-96x96.png 96w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_044949.png 1148w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"FCC Identification Data\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTA0MjIsInVybCI6Imh0dHBzOlwvXC93d3cuc2luY2xhaXJjb2xsZWN0aW9uLnNpdGVcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA1XC9QaG90b3Jvb20tMjAyNDA1MTNfMDQ1MDUzLnBuZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045053.png'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045053-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045053-150x150.png 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045053-666x666.png 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045053-96x96.png 96w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Mailer box\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTA0MjUsInVybCI6Imh0dHBzOlwvXC93d3cuc2luY2xhaXJjb2xsZWN0aW9uLnNpdGVcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA1XC9QaG90b3Jvb20tMjAyNDA1MTNfMDQ1MjEyLnBuZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045212.png'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045212-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045212-150x150.png 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045212-666x666.png 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045212-96x96.png 96w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Box contents\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTA0MjEsInVybCI6Imh0dHBzOlwvXC93d3cuc2luY2xhaXJjb2xsZWN0aW9uLnNpdGVcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA1XC9QaG90b3Jvb20tMjAyNDA1MTNfMDQ1OTE5LnBuZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045919.png'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045919-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045919-150x150.png 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045919-666x666.png 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_045919-96x96.png 96w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Manual, supplement and American Express thank-you card\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTA0MjAsInVybCI6Imh0dHBzOlwvXC93d3cuc2luY2xhaXJjb2xsZWN0aW9uLnNpdGVcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA1XC9QaG90b3Jvb20tMjAyNDA1MTNfMDUwNDE2LnBuZyIsInNsaWRlc2hvdyI6IjVkNmU2OWYifQ%3D%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_050416.png'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_050416-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_050416-150x150.png 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_050416-666x666.png 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/Photoroom-20240513_050416-96x96.png 96w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"ZX81 KONG loaded from tape\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTg2LCJ1cmwiOiJodHRwczpcL1wvd3d3LnNpbmNsYWlyY29sbGVjdGlvbi5zaXRlXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDIyXC8wMlwvNV8xM19EU0NfNDg0MC5qcGciLCJzbGlkZXNob3ciOiI1ZDZlNjlmIn0%3D\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2022\/02\/5_13_DSC_4840.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2022\/02\/5_13_DSC_4840-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/div><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"5d6e69f\" data-elementor-lightbox-title=\"Advertisement\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTEzOTMsInVybCI6Imh0dHBzOlwvXC93d3cuc2luY2xhaXJjb2xsZWN0aW9uLnNpdGVcL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjRcLzA1XC9hZHNfMDA0LW0uanBnIiwic2xpZGVzaG93IjoiNWQ2ZTY5ZiJ9\" href='https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/ads_004-m.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/ads_004-m-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/ads_004-m-150x150.jpg 150w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/ads_004-m-666x666.jpg 666w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/05\/ads_004-m-96x96.jpg 96w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/div><\/figure>\n\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1df85eb elementor-widget elementor-widget-text-editor\" data-id=\"1df85eb\" data-element_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<p>Similar to the\u00a0<a style=\"background-color: #c70101;\" href=\"https:\/\/www.sinclaircollection.site\/?page_id=408\"><u>Timex Sinclair 1000<\/u><\/a>, it has a TV channel 2\/3 switch on the underside and supporting RF modulator, metallized inside of the case and\u00a0 &#8216;DELETE&#8217; and &#8216;ENTER&#8217; in place of &#8216;RUB OUT&#8217; and &#8216;NEW LINE&#8217; on the keyboard. However it still does only have 1Kb of ROM, unlike the otherwise very similar Timex Sinclair 1000.<\/p>\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=\"elementor-section elementor-top-section elementor-element elementor-element-46e622e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"46e622e\" data-element_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=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-2367a11\" data-id=\"2367a11\" data-element_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-93e0910 elementor-widget elementor-widget-text-editor\" data-id=\"93e0910\" data-element_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<p>The address of Sinclair in the USA was<\/p><p>One Sinclair Plaza<br \/>Nashua<br \/>NH 03061<\/p><p>but this address doesn&#8217;t actually exist!<\/p><p>According to the Nashua Telegraph of March 12, 1982 it&#8217;s <a href=\"https:\/\/www.google.nl\/maps\/@42.7636171,-71.4559714,3a,75y,219.52h,101.79t\/data=!3m7!1e1!3m5!1sWS1ov6U1Tw-NVIVzY5JE1A!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DWS1ov6U1Tw-NVIVzY5JE1A%26cb_client%3Dmaps_sv.share%26w%3D900%26h%3D600%26yaw%3D219.51962262950408%26pitch%3D-11.78935923368256%26thumbfov%3D90!7i16384!8i8192?coh=205410&amp;entry=ttu\"><u>141 Canal Street<\/u><\/a>\u00a0(which also happens to be the address on the &#8216;American Express Special Offer Center&#8217; mailer box):<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ca47ef6 elementor-widget elementor-widget-image\" data-id=\"ca47ef6\" data-element_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<img loading=\"lazy\" decoding=\"async\" width=\"587\" height=\"367\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-now.png\" class=\"attachment-large size-large wp-image-12314\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-now.png 587w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-now-300x188.png 300w\" sizes=\"(max-width: 587px) 100vw, 587px\" \/>\t\t\t\t\t\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=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-3c26377\" data-id=\"3c26377\" data-element_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-a951b93 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"a951b93\" data-element_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<img loading=\"lazy\" decoding=\"async\" width=\"920\" height=\"215\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/sinclair-nashua-1024x239.png\" class=\"attachment-large size-large wp-image-12307\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/sinclair-nashua-1024x239.png 1024w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/sinclair-nashua-300x70.png 300w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/sinclair-nashua-768x179.png 768w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/sinclair-nashua.png 1122w\" sizes=\"(max-width: 920px) 100vw, 920px\" \/>\t\t\t\t\t\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-cca7297 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"cca7297\" data-element_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<img loading=\"lazy\" decoding=\"async\" width=\"392\" height=\"104\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/2-sinclair-plaza.png.jpg\" class=\"attachment-medium_large size-medium_large wp-image-12353\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/2-sinclair-plaza.png.jpg 392w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/2-sinclair-plaza.png-300x80.jpg 300w\" sizes=\"(max-width: 392px) 100vw, 392px\" \/>\t\t\t\t\t\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-6dc1b70 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"6dc1b70\" data-element_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<img loading=\"lazy\" decoding=\"async\" width=\"920\" height=\"544\" src=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-telegraph-1024x605.png\" class=\"attachment-large size-large wp-image-12306\" alt=\"\" srcset=\"https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-telegraph-1024x605.png 1024w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-telegraph-300x177.png 300w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-telegraph-768x454.png 768w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-telegraph-1536x908.png 1536w, https:\/\/www.sinclaircollection.site\/wp-content\/uploads\/2024\/06\/nashua-telegraph-2048x1210.png 2048w\" sizes=\"(max-width: 920px) 100vw, 920px\" \/>\t\t\t\t\t\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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-04fba98 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"04fba98\" data-element_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=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-9c0ee53\" data-id=\"9c0ee53\" data-element_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-08b7622 elementor-widget elementor-widget-text-editor\" data-id=\"08b7622\" data-element_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<p>8-bit Retro Journal visited the site in July 2023 and made a\u00a0<u><a href=\"https:\/\/www.youtube.com\/watch?v=5Hkhuc6PEnM&amp;t=198s\" target=\"_blank\" rel=\"noopener\">video<\/a><\/u>\u00a0of it.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ba128a1 elementor-widget elementor-widget-text-editor\" data-id=\"ba128a1\" data-element_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\tPin 22 of the ULA determines if it&#8217;s a UK or US machine. If the pin is left floating (not connected), a UK machine is chosen. When Pin 22 is shorted to 0 volts (directly or via a low value resistor), a US machine is selected.\n\nReading input port $FE (254), bit 6 reports the status of pin 22: 0 = US; 1 = UK.\nUnlike the\u00a0<a href=\"https:\/\/www.sinclaircollection.site\/?page_id=7873\"><u>ZX Spectrum<\/u><\/a>\u00a0which has an &#8220;IN&#8221; function, the ZX81 needs a bit of machine code to read this port in BASIC:\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c185cb8 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"c185cb8\" data-element_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<p>\u00a0<\/p><p>\u00a0 \u00a0 \u00a01 REM 123456<br \/>\u00a0 \u00a0 10 POKE 16514,175<br \/>\u00a0 \u00a0 20 POKE 16515,71<br \/>\u00a0 \u00a0 30 POKE 16516,219<br \/>\u00a0 \u00a0 40 POKE 16517,254<br \/>\u00a0 \u00a0 50 POKE 16518,79<br \/>\u00a0 \u00a0 60 POKE 16519,201<br \/>\u00a0 \u00a0 70 LET U=USR 16514<br \/>\u00a0 \u00a0 80 PRINT \u00a8THIS IS A \u00a8;(\u00a8NTSC\u00a8<br \/>\u00a0 AND U=63);(\u00a8PAL\u00a8\u00a0AND U=127);\u00a8\u00a0MA<br \/>\u00a0 CHINE.\u00a8<\/p><p>\u00a0<\/p><p>\u00a0<\/p>\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<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Brand:&nbsp;Sinclair Research Ltd.Model:&nbsp;ZX81Country of origin:&nbsp;United States of AmericaMade in: Scotland<\/p>\n<p><span class=\"more-link\"><a href=\"https:\/\/www.sinclaircollection.site\/?page_id=328\" class=\"readmore\">Continue reading<span class=\"screen-reader-text\">Sinclair ZX81 (USA)<\/span><\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-328","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.sinclaircollection.site\/index.php?rest_route=\/wp\/v2\/pages\/328","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sinclaircollection.site\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.sinclaircollection.site\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.sinclaircollection.site\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sinclaircollection.site\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=328"}],"version-history":[{"count":155,"href":"https:\/\/www.sinclaircollection.site\/index.php?rest_route=\/wp\/v2\/pages\/328\/revisions"}],"predecessor-version":[{"id":13319,"href":"https:\/\/www.sinclaircollection.site\/index.php?rest_route=\/wp\/v2\/pages\/328\/revisions\/13319"}],"wp:attachment":[{"href":"https:\/\/www.sinclaircollection.site\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}