{"id":38,"date":"2025-02-07T22:38:41","date_gmt":"2025-02-07T22:38:41","guid":{"rendered":"https:\/\/www.vintagevibe.co.nzwww.vintagevibe.co.nz192.168.1.164\/?p=38"},"modified":"2025-07-27T02:40:23","modified_gmt":"2025-07-27T02:40:23","slug":"sinclair-mk14-replica","status":"publish","type":"post","link":"https:\/\/www.vintagevibe.co.nz\/?p=38","title":{"rendered":"Sinclair Mk14 Replica"},"content":{"rendered":"[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;section&#8221; _builder_version=&#8221;3.22&#8243; custom_padding=&#8221;0px||3px|||&#8221;][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;3.25&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;3.25&#8243; custom_padding=&#8221;|||&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;3.27.4&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221;]\n<p>The MK14 (Microcomputer Kit 14) was a computer kit sold by Science of Cambridge of the United Kingdom, first introduced in 1977 for \u00a339.95. The price was very low for a complete computer system at the time, and Science of Cambridge eventually sold over fifteen thousand kit<\/p>\n\n\n\n<p>The computer is based around National Semiconductor\u2019s SC\/MP CPU (INS8060) and shipped with 256 bytes of random-access memory (RAM) and 512 bytes of read-only memory (ROM) as standard. It used an eight or nine red light-emitting diode (LED) seven segment display, there was also optional VDU supporting 32\u00d716 text or 64\u00d764 graphics.[citation needed] Input and output was a 20-key keyboard and reset switch. Cassette-based and PROM storage were optional extras; a sound card was not included but a design for one was provided.<\/p>\n\n\n\n<p>The on-board RAM could be increased in two ways; by the addition of an INS8154N RAM\/IO chip providing an additional 128 bytes of RAM along with 16 I\/O lines, and also a further 256 bytes by adding two 256 \u00d7 4 bit RAM chips giving a maximum of 640 bytes on board. These memory spaces were not contiguous in the memory map. It was possible to connect off-board RAM giving a 2170 bytes total.<\/p>\n\n\n\n<p>The Sinclair MK14 was a minimalist single-board computer with the following key features:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A&nbsp;<strong>National Semiconductor SC\/MP (INS8060)<\/strong>&nbsp;microprocessor running at 4.43 MHz.<\/li>\n\n\n\n<li><strong>256 bytes of RAM<\/strong>&nbsp;(expandable to 640 bytes).<\/li>\n\n\n\n<li><strong>512 bytes of ROM<\/strong>&nbsp;containing the monitor program.<\/li>\n\n\n\n<li>A&nbsp;<strong>20-key keypad<\/strong>&nbsp;for input.<\/li>\n\n\n\n<li>A&nbsp;<strong>9-digit 7-segment LED display<\/strong>&nbsp;for output.<\/li>\n\n\n\n<li>Expansion capabilities for additional memory and peripherals.<\/li>\n<\/ul>\n\n\n\n<p>These are my Mk14 Replica\u2019s Machines<\/p>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||4px|||&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221;][et_pb_gallery gallery_ids=&#8221;44,46,47,48&#8243; fullwidth=&#8221;on&#8221; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221;][\/et_pb_gallery][et_pb_text _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243;]<p style=\"text-align: center;\">My current colection of Replica MK14 computers<\/p>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221;][et_pb_image src=&#8221;https:\/\/www.vintagevibe.co.nz\/wp-content\/uploads\/2025\/04\/MK14-line-up-scaled-1.jpg&#8221; title_text=&#8221;MK14-line-up-scaled&#8221; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243;]<p style=\"text-align: center;\">From Left to Right<\/p>\n<p style=\"text-align: center;\">MGH8080GAL &#8211; PIC14 v2 &#8211; Ian L MK14 &#8211; MK14 Issue VI (Blue-PCB with PicVDU) &#8211; MK14 Issue VI &#8211; JM Issue MK14<\/p>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;5px||4px|||&#8221; min_height=&#8221;104px&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221;][et_pb_image src=&#8221;https:\/\/www.vintagevibe.co.nz\/wp-content\/uploads\/2025\/04\/MK14-moonlander-scaled-1.jpg&#8221; title_text=&#8221;MK14-moonlander-scaled&#8221; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243;]<p style=\"text-align: center;\">My Issue\u00a0 VI connected to a PicVDU<\/p>\n<p style=\"text-align: center;\">Pic VDU still has a little problem with line down left side of monitor.<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221;][et_pb_image src=&#8221;https:\/\/www.vintagevibe.co.nz\/wp-content\/uploads\/2025\/04\/20250204_114833-1-scaled.jpg&#8221; title_text=&#8221;20250204_114833&#8243; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221;][et_pb_column _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243;][et_pb_image src=&#8221;https:\/\/www.vintagevibe.co.nz\/wp-content\/uploads\/2025\/07\/vdu.jpg&#8221; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; title_text=&#8221;vdu&#8221; hover_enabled=&#8221;0&#8243;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243;]<p style=\"text-align: center;\">Next little project will be to test out a reproduction of the VDU board.<\/p>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221;][et_pb_column _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243;][et_pb_image src=&#8221;https:\/\/www.vintagevibe.co.nz\/wp-content\/uploads\/2025\/07\/JP-mk14-uploaded-scaled.jpg&#8221; _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; title_text=&#8221;JP-mk14-uploaded&#8221; hover_enabled=&#8221;0&#8243;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.5.3&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243;]<p style=\"text-align: center;\">My latest addon the Pico uploader connected to a JM version MK14.<\/p>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]","protected":false},"excerpt":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;section&#8221; _builder_version=&#8221;3.22&#8243; custom_padding=&#8221;0px||3px|||&#8221;][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;3.25&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;3.25&#8243; custom_padding=&#8221;|||&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;3.27.4&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221;] The MK14 (Microcomputer Kit 14) was a computer kit sold by Science of Cambridge of the United Kingdom, first introduced in 1977 for \u00a339.95. The price was very low for a complete computer system at the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":733,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"<!-- wp:paragraph -->\r\n<p>The MK14 (Microcomputer Kit 14) was a computer kit sold by Science of Cambridge of the United Kingdom, first introduced in 1977 for \u00a339.95. The price was very low for a complete computer system at the time, and Science of Cambridge eventually sold over fifteen thousand kit<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>The computer is based around National Semiconductor\u2019s SC\/MP CPU (INS8060) and shipped with 256 bytes of random-access memory (RAM) and 512 bytes of read-only memory (ROM) as standard. It used an eight or nine red light-emitting diode (LED) seven segment display, there was also optional VDU supporting 32\u00d716 text or 64\u00d764 graphics.[citation needed] Input and output was a 20-key keyboard and reset switch. Cassette-based and PROM storage were optional extras; a sound card was not included but a design for one was provided.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>The on-board RAM could be increased in two ways; by the addition of an INS8154N RAM\/IO chip providing an additional 128 bytes of RAM along with 16 I\/O lines, and also a further 256 bytes by adding two 256 \u00d7 4 bit RAM chips giving a maximum of 640 bytes on board. These memory spaces were not contiguous in the memory map. It was possible to connect off-board RAM giving a 2170 bytes total.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>The Sinclair MK14 was a minimalist single-board computer with the following key features:<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:list -->\r\n<ul><!-- wp:list-item -->\r\n<li>A\u00a0<strong>National Semiconductor SC\/MP (INS8060)<\/strong>\u00a0microprocessor running at 4.43 MHz.<\/li>\r\n<!-- \/wp:list-item -->\r\n\r\n<!-- wp:list-item -->\r\n<li><strong>256 bytes of RAM<\/strong>\u00a0(expandable to 640 bytes).<\/li>\r\n<!-- \/wp:list-item -->\r\n\r\n<!-- wp:list-item -->\r\n<li><strong>512 bytes of ROM<\/strong>\u00a0containing the monitor program.<\/li>\r\n<!-- \/wp:list-item -->\r\n\r\n<!-- wp:list-item -->\r\n<li>A\u00a0<strong>20-key keypad<\/strong>\u00a0for input.<\/li>\r\n<!-- \/wp:list-item -->\r\n\r\n<!-- wp:list-item -->\r\n<li>A\u00a0<strong>9-digit 7-segment LED display<\/strong>\u00a0for output.<\/li>\r\n<!-- \/wp:list-item -->\r\n\r\n<!-- wp:list-item -->\r\n<li>Expansion capabilities for additional memory and peripherals.<\/li>\r\n<!-- \/wp:list-item --><\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>These are my Mk14 Replica\u2019s Machines<\/p>\r\n<!-- \/wp:paragraph -->","_et_gb_content_width":"","footnotes":""},"categories":[9],"tags":[],"class_list":["post-38","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-single-board-computers"],"_links":{"self":[{"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=\/wp\/v2\/posts\/38","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=38"}],"version-history":[{"count":11,"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=\/wp\/v2\/posts\/38\/revisions"}],"predecessor-version":[{"id":1771,"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=\/wp\/v2\/posts\/38\/revisions\/1771"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=\/wp\/v2\/media\/733"}],"wp:attachment":[{"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=38"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=38"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vintagevibe.co.nz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=38"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}