{"id":3713,"date":"2019-11-29T13:44:59","date_gmt":"2019-11-29T13:44:59","guid":{"rendered":"http:\/\/avitech.com.au\/?page_id=3713"},"modified":"2019-11-29T13:44:59","modified_gmt":"2019-11-29T13:44:59","slug":"dec-pdp-11-23-in-ba11-n-chassis","status":"publish","type":"page","link":"https:\/\/avitech.com.au\/?page_id=3713","title":{"rendered":"DEC PDP-11\/23 in BA11-N Chassis"},"content":{"rendered":"<div data-carousel-extra='{&quot;blog_id&quot;:1,&quot;permalink&quot;:&quot;https:\/\/avitech.com.au\/?page_id=3713&quot;}' id='gallery-1' class='gallery galleryid-3713 gallery-columns-3 gallery-size-medium'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?ssl=1\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?fit=300%2C225&amp;ssl=1\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?w=1440&amp;ssl=1 1440w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?resize=1024%2C768&amp;ssl=1 1024w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?resize=150%2C113&amp;ssl=1 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" data-attachment-id=\"3718\" data-permalink=\"https:\/\/avitech.com.au\/?attachment_id=3718\" data-orig-file=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?fit=1440%2C1080&amp;ssl=1\" data-orig-size=\"1440,1080\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;camera&quot;:&quot;Pixel 3 XL&quot;,&quot;created_timestamp&quot;:&quot;1575064992&quot;,&quot;focal_length&quot;:&quot;4.44&quot;,&quot;iso&quot;:&quot;59&quot;,&quot;shutter_speed&quot;:&quot;0.04001&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"IMG_20191129_220312\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220312.jpg?fit=900%2C675&amp;ssl=1\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?ssl=1\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?fit=300%2C225&amp;ssl=1\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?w=1440&amp;ssl=1 1440w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?resize=1024%2C768&amp;ssl=1 1024w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?resize=150%2C113&amp;ssl=1 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" data-attachment-id=\"3717\" data-permalink=\"https:\/\/avitech.com.au\/?attachment_id=3717\" data-orig-file=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?fit=1440%2C1080&amp;ssl=1\" data-orig-size=\"1440,1080\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;camera&quot;:&quot;Pixel 3 XL&quot;,&quot;created_timestamp&quot;:&quot;1575065012&quot;,&quot;focal_length&quot;:&quot;4.44&quot;,&quot;iso&quot;:&quot;127&quot;,&quot;shutter_speed&quot;:&quot;0.04001&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"IMG_20191129_220332\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220332.jpg?fit=900%2C675&amp;ssl=1\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?ssl=1\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?fit=300%2C225&amp;ssl=1\" class=\"attachment-medium size-medium\" alt=\"\" srcset=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?w=1440&amp;ssl=1 1440w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?resize=1024%2C768&amp;ssl=1 1024w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?resize=150%2C113&amp;ssl=1 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" data-attachment-id=\"3719\" data-permalink=\"https:\/\/avitech.com.au\/?attachment_id=3719\" data-orig-file=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?fit=1440%2C1080&amp;ssl=1\" data-orig-size=\"1440,1080\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;1.8&quot;,&quot;camera&quot;:&quot;Pixel 3 XL&quot;,&quot;created_timestamp&quot;:&quot;1575065007&quot;,&quot;focal_length&quot;:&quot;4.44&quot;,&quot;iso&quot;:&quot;60&quot;,&quot;shutter_speed&quot;:&quot;0.020026&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"IMG_20191129_220327\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2019\/11\/IMG_20191129_220327.jpg?fit=900%2C675&amp;ssl=1\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<h4>Backplane Configuration<\/h4>\n<p>The table below shows how the H9273-A backplane is currently populated.<\/p>\n<table class=\"report\" style=\"width:90%;margin-left:5%;\">\n<thead>\n<tr>\n<th class=\"report\" style=\"width:25%;\">A<\/th>\n<th class=\"report\" style=\"width:25%;\">B<\/th>\n<th class=\"report\" style=\"width:25%;\">C<\/th>\n<th class=\"report\" style=\"width:25%;\">D<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"report\">\n<td class=\"report\" colspan=\"2\" align=\"center\">M8186 (11\/23 Processor)<\/td>\n<td class=\"report\" colspan=\"2\" align=\"center\">Empty<\/td>\n<\/tr>\n<tr class=\"report\">\n<td class=\"report\" colspan=\"2\" align=\"center\">M8047 (MXV11-A)<\/td>\n<td class=\"report\" colspan=\"2\" align=\"center\">Empty<\/td>\n<\/tr>\n<tr class=\"report\">\n<td class=\"report\" colspan=\"2\" align=\"center\">M8044 (64KB RAM)<\/td>\n<td class=\"report\" colspan=\"2\" align=\"center\">Empty<\/td>\n<\/tr>\n<tr class=\"report\">\n<td class=\"report\" colspan=\"4\" align=\"center\">M8013 (RLV11)<\/td>\n<\/tr>\n<tr class=\"report\">\n<td class=\"report\" colspan=\"4\" align=\"center\">M8014 (RLV11)<\/td>\n<\/tr>\n<tr class=\"report\">\n<td class=\"report\" colspan=\"4\" align=\"center\">Empty<\/td>\n<\/tr>\n<tr class=\"report\">\n<td class=\"report\" colspan=\"4\" align=\"center\">Empty<\/td>\n<\/tr>\n<tr class=\"report\">\n<td class=\"report\" colspan=\"4\" align=\"center\">Empty<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>Current configuration<\/h4>\n<p>This is a basic 11\/23 capable of booting RT-11 V5.3 from a TU58 emulator.  It is also fitted with a working RLV11 controller.<\/p>\n<p>The M8047 is fitted with boot ROMs.  Currently it is configured to boot from a TU58 emulator, but with a configuration change it could boot from an RX02 drive instead.<\/p>\n<p>On the M8047, the left-hand connector goes to the TU58 drive (38,400 baud) and the right-hand connector goes to the system console (9,600 baud).<\/p>\n<p>The ROMs from a second M8047 (which is no longer fitted to the H9273 backplane) were removed and fitted to the M8047 that is still fitted to this system. To implement this change on the remaining M8047, a jumper between J21\/J22 and J8 was removed (J21 continued to be linked to J22).  J29 was already connected to J15, which selects the TU58 bootstrap. Optionally, the RX02 bootstrap could be selected instead by linking J29 to J16. <\/p>\n<h4>Original configuration<\/h4>\n<p>This BA11-N chassis originally did not have a switch panel.  The one currently fitted was swapped in from a different BA11-N chassis.<\/p>\n<p>This system originally included a second M8047 card. That other card was fitted with boot ROMs.  According to the jumper settings, it was configured to run the RX02 bootstrap, but this was not tested. This board was causing a Bus Error trap and had to be removed from the system.  The trap would occur even when executing a simple BR instruction (at an address outside the RAM range of the M8047).  <\/p>\n<p>It also originally included an M8029 (RXV21).  That was removed on 31.08.2017 to use in another system.<\/p>\n<h4>Revision history<\/h4>\n<p>30.11.2019: First version of this page was created.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Backplane Configuration The table below shows how the H9273-A backplane is currently populated. A B C D M8186 (11\/23 Processor) Empty M8047 (MXV11-A) Empty M8044 (64KB RAM) Empty M8013 (RLV11) M8014 (RLV11) Empty Empty Empty Current configuration This is a basic 11\/23 capable of booting RT-11 V5.3 from a TU58 emulator. It is also fitted ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/avitech.com.au\/?page_id=3713\" 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-3713","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P7xTsk-XT","jetpack-related-posts":[{"id":2821,"url":"https:\/\/avitech.com.au\/?page_id=2821","url_meta":{"origin":3713,"position":0},"title":"DEC PDP-11\/10","author":"malcolm","date":"22-October-2017","format":false,"excerpt":"I have two PDP-11\/10 units. The first one has been upgraded to MOS memory before I received it. The second one still uses core memory. Both are in working order (or at least they were in working order when I last tested them). PDP-11\/10 with MOS memory This is a\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\/10\/20171022_220833_resized.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/20171022_220833_resized.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/20171022_220833_resized.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/20171022_220833_resized.jpg?resize=700%2C400 2x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/20171022_220833_resized.jpg?resize=1050%2C600 3x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/10\/20171022_220833_resized.jpg?resize=1400%2C800 4x"},"classes":[]},{"id":366,"url":"https:\/\/avitech.com.au\/?page_id=366","url_meta":{"origin":3713,"position":1},"title":"PDP-11\/70","author":"mmacleod@iinet.net.au","date":"22-May-2016","format":false,"excerpt":"I was lucky enough to pickup a PDP-11\/70 last week, thanks to the generosity of a fellow collector. The racks The PDP-11\/70 Maintenance and Installation Manual (EK-11070-MM-002) explains that the basic PDP-11\/70 system components are located in a double cabinet as shown in Figure 1-1 of that manual. That figure\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\/2016\/05\/11-70-front-panel-Medium.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2016\/05\/11-70-front-panel-Medium.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2016\/05\/11-70-front-panel-Medium.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2016\/05\/11-70-front-panel-Medium.jpg?resize=700%2C400 2x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2016\/05\/11-70-front-panel-Medium.jpg?resize=1050%2C600 3x"},"classes":[]},{"id":1657,"url":"https:\/\/avitech.com.au\/?page_id=1657","url_meta":{"origin":3713,"position":2},"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":3219,"url":"https:\/\/avitech.com.au\/?page_id=3219","url_meta":{"origin":3713,"position":3},"title":"OMNIBUS CPLD Prototyping Board #1","author":"malcolm","date":"18-April-2018","format":false,"excerpt":"OMNIBUS is the name given to the backplane connectors on PDP-8\/e computers. It is also used on a few other PDP-8 computers (8\/f, 8\/m, 8\/a and perhaps others). After about a year of procrastinating, using KiCAd I have finally (April 2018) got around to laying out an OMNIBUS \"sea of\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\/2018\/04\/omnibus-cpld-prototype-1-composite-1-300x134.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2634,"url":"https:\/\/avitech.com.au\/?page_id=2634","url_meta":{"origin":3713,"position":4},"title":"DEC PDP-11\/73 in BA123 cabinet","author":"malcolm","date":"30-September-2017","format":false,"excerpt":"I have built up a PDP-11\/73 system in a BA123 cabinet. My aim is for this system to be able to boot either RT-11 V5.7 or RSX-11M+. The primary MSCP controller is a CMD CQD-220 controller with a SCSI2SD device connected to it. Up to 4 logical devices can exist\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2393,"url":"https:\/\/avitech.com.au\/?page_id=2393","url_meta":{"origin":3713,"position":5},"title":"DEC BA23 Chassis","author":"malcolm","date":"18-July-2017","format":false,"excerpt":"These are my rough notes regarding the DEC BA23 chassis. The BA23 houses the H9278A backplane. On the back of the H9278A there is a BA23-A breakout board for RQDXn-series controllers. I've not been able to locate any schematics for the BA23 enclosure. The following manuals have useful information about\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\/07\/20170718_201346-Large.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/07\/20170718_201346-Large.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/07\/20170718_201346-Large.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/07\/20170718_201346-Large.jpg?resize=700%2C400 2x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/07\/20170718_201346-Large.jpg?resize=1050%2C600 3x, https:\/\/i0.wp.com\/avitech.com.au\/wp-content\/uploads\/2017\/07\/20170718_201346-Large.jpg?resize=1400%2C800 4x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/pages\/3713","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=3713"}],"version-history":[{"count":8,"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/pages\/3713\/revisions"}],"predecessor-version":[{"id":3724,"href":"https:\/\/avitech.com.au\/index.php?rest_route=\/wp\/v2\/pages\/3713\/revisions\/3724"}],"wp:attachment":[{"href":"https:\/\/avitech.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}