{"id":2722,"date":"2017-10-15T03:11:38","date_gmt":"2017-10-15T03:11:38","guid":{"rendered":"http:\/\/avitech.com.au\/?page_id=2722"},"modified":"2017-11-14T12:01:35","modified_gmt":"2017-11-14T12:01:35","slug":"grc-tbc-qbus-board","status":"publish","type":"page","link":"https:\/\/avitech.com.au\/?page_id=2722","title":{"rendered":"GRC TBC QBUS Board"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"2723\" data-permalink=\"https:\/\/avitech.com.au\/?attachment_id=2723\" data-orig-file=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?fit=2749%2C1591&amp;ssl=1\" data-orig-size=\"2749,1591\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.7&quot;,&quot;camera&quot;:&quot;SM-G955F&quot;,&quot;created_timestamp&quot;:&quot;1508070184&quot;,&quot;focal_length&quot;:&quot;4.2&quot;,&quot;iso&quot;:&quot;40&quot;,&quot;shutter_speed&quot;:&quot;0.010416666666667&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"grc-tbc-pcb\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?fit=900%2C521&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?resize=300%2C174&#038;ssl=1\" alt=\"\" width=\"300\" height=\"174\" class=\"alignright size-medium wp-image-2723\" srcset=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?resize=300%2C174&amp;ssl=1 300w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?resize=768%2C444&amp;ssl=1 768w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?resize=1024%2C593&amp;ssl=1 1024w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?resize=150%2C87&amp;ssl=1 150w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?w=1800&amp;ssl=1 1800w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/grc-tbc-pcb.jpg?w=2700&amp;ssl=1 2700w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The &#8220;GRC TBC&#8221; is a bootstrap and terminator board designed for PDP-11 QBUS systems.<\/p>\n<p>The manufacturer is General Robotics Corporation.<\/p>\n<p>The TBC provides the following functionality:<\/p>\n<ul>\n<li>Termination for QBUS backplane signals<\/li>\n<li>On-board EPROMs (for bootstrap or other purposes)<\/li>\n<li>Support for front-panel functionality (run status indicator, enable\/halt switch and LTC switch)<\/li>\n<li>Capability to generate LTC signal from external AC transformer<\/li>\n<\/ul>\n<p>According to the User&#8217;s Manual, GRC made available a range of bootstrap EPROMs for this board (including support for RX02 and RL drives).  I have one set of EPROMs for this board. I don&#8217;t yet know which device these support, but I have inserted links to them below.<\/p>\n<h4>Links<\/h4>\n<p><span style=\"padding-left: 30px;\"><a href=\"http:\/\/www.avitech.com.au\/mm-files\/scans\/grc-tbc-users-manual.pdf\" target=\"_blank\">GRC TBC User&#8217;s Manual<\/a><\/span><\/p>\n<p><span style=\"padding-left: 30px;\"><a href=\"http:\/\/www.avitech.com.au\/mm-files\/grc-tbc-qbus-board\/TBC-HI-0.BIN\" target=\"_blank\">EPROM marked &#8220;TBC 1 Hi&#8221;<\/a><\/span><\/p>\n<p><span style=\"padding-left: 30px;\"><a href=\"http:\/\/www.avitech.com.au\/mm-files\/grc-tbc-qbus-board\/TBC-LO-0.BIN\" target=\"_blank\">EPROM marked &#8220;TBC 1 Lo&#8221;<\/a><\/span><\/p>\n<p>I have also found the following documentation (which appears likely to be earlier than the Users Manual mentioned above):<\/p>\n<p><span style=\"padding-left: 30px;\"><a href=\"http:\/\/www.avitech.com.au\/mm-files\/scans\/grc-tbc-11-specifications-october-1978.pdf\" target=\"_blank\">GRC TBC-11 Specifications<\/a><\/span><\/p>\n<p><span style=\"padding-left: 30px;\"><a href=\"http:\/\/www.avitech.com.au\/mm-files\/scans\/grc-tbc-11-schematic.pdf\" target=\"_blank\">GRC TBC-11 Schematic<\/a><\/span><\/p>\n<p><span style=\"padding-left: 30px;\"><a href=\"http:\/\/www.avitech.com.au\/mm-files\/scans\/grc-tbc-bootstrap.pdf\" target=\"_blank\">TBC Hard Bootstrap for Cartridge Disk and RX01 Floppy<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The &#8220;GRC TBC&#8221; is a bootstrap and terminator board designed for PDP-11 QBUS systems. The manufacturer is General Robotics Corporation. The TBC provides the following functionality: Termination for QBUS backplane signals On-board EPROMs (for bootstrap or other purposes) Support for front-panel functionality (run status indicator, enable\/halt switch and LTC switch) Capability to generate LTC signal ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/avitech.com.au\/?page_id=2722\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2722","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P7xTsk-HU","jetpack-related-posts":[{"id":951,"url":"https:\/\/avitech.com.au\/?page_id=951","url_meta":{"origin":2722,"position":0},"title":"Scanned documents","author":"malcolm","date":"27-July-2016","format":false,"excerpt":"Camintonn Camintonn CM-DLV11-J 4-Channel Serial Interface Installation Manual Webster Webster PCLV11-J Multifunction Unit Technical Manual Webster WQSMD QBUS Winchester Disc Controller GRC DLV11: GRC DLV11 Interface Specifications GRC DLV11 Schematic GRC RXV21: General Robotics Corporation: RXV21 User Manual GRC TBC (Terminator \/ Bootstrap \/ Clock): General Robotics Corporation: TBC User\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3697,"url":"https:\/\/avitech.com.au\/?page_id=3697","url_meta":{"origin":2722,"position":1},"title":"UNIX V6 on QBUS PDP-11","author":"malcolm","date":"17-November-2019","format":false,"excerpt":"I've starting playing around with UNIX v6 on the PDP-11. I'm using the \"v6_rl02_unknown\" image, which is discussed and available for download from https:\/\/github.com\/eunuchs\/unix-archive\/tree\/master\/PDP-11\/Boot_Images. This is an RL02 image. It must have a modified kernel, as apparently V6 was not originally distributed on RL02 media. Hardware The hardware used was\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1887,"url":"https:\/\/avitech.com.au\/?page_id=1887","url_meta":{"origin":2722,"position":2},"title":"Digital Electronics QBUS Cabinet","author":"malcolm","date":"18-April-2017","format":false,"excerpt":"In my collection I have this rather interesting third-party QBUS system. The manufacturer was an Australian company called \"Digital Electronics\". This appears to have been specifically designed and built for lab A\/D work. The front panel has various analogue I\/O connectors. At the top of the rack is a separate\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/04\/20170324_112154_1492508841761_resized.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/04\/20170324_112154_1492508841761_resized.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/04\/20170324_112154_1492508841761_resized.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/04\/20170324_112154_1492508841761_resized.jpg?resize=700%2C400 2x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/04\/20170324_112154_1492508841761_resized.jpg?resize=1050%2C600 3x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/04\/20170324_112154_1492508841761_resized.jpg?resize=1400%2C800 4x"},"classes":[]},{"id":1657,"url":"https:\/\/avitech.com.au\/?page_id=1657","url_meta":{"origin":2722,"position":3},"title":"QBUS Front Panel Project","author":"malcolm","date":"31-January-2017","format":false,"excerpt":"This project is an Arudino-based front panel for a bare QBUS PDP-11 chassis. It provides the switch and indicator functionality typically found on an early QBUS PDP-11 chassis (such as a BA11-MF or BA11-NC) and does the following: Switches an ATX power supply on and off, to power the PDP-11\u2026","rel":"","context":"With 5 comments","block_context":{"text":"With 5 comments","link":"https:\/\/avitech.com.au\/?page_id=1657#comments"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/01\/20170712_111817-Medium.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/01\/20170712_111817-Medium.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/01\/20170712_111817-Medium.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/01\/20170712_111817-Medium.jpg?resize=700%2C400 2x"},"classes":[]},{"id":1664,"url":"https:\/\/avitech.com.au\/?page_id=1664","url_meta":{"origin":2722,"position":4},"title":"QBUS Notes","author":"malcolm","date":"1-February-2017","format":false,"excerpt":"This page captures my rough working notes regarding QBUS systems. You probably won't find anything greatly useful here. It is mainly a place for me to records things that I seem to continually forget the details of! BA11-NC Chassis This is a 9 row 18-bit ABCD chassis. So dual-height cards\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2036,"url":"https:\/\/avitech.com.au\/?page_id=2036","url_meta":{"origin":2722,"position":5},"title":"Links &#8211; DEC related","author":"malcolm","date":"24-May-2017","format":false,"excerpt":"This page is just a collection of links relevant to DEC computers and equipment. Identifying DEC Boards www.pdp-8.org's \"list of 8\/10\/11 M-series cards\" www.pdp-8.org's \"Index to mostly OMNIBUS cards\" DEC Option List and Module List (on the Internet Archive: 232 Pages) Bitsaver's directory containing Options List and Modules Lists Doug\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/pages\/2722","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/avitech.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2722"}],"version-history":[{"count":5,"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/pages\/2722\/revisions"}],"predecessor-version":[{"id":2864,"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/pages\/2722\/revisions\/2864"}],"wp:attachment":[{"href":"https:\/\/avitech.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}