{"id":3407,"date":"2018-08-14T13:01:35","date_gmt":"2018-08-14T13:01:35","guid":{"rendered":"http:\/\/avitech.com.au\/?page_id=3407"},"modified":"2022-07-18T22:58:17","modified_gmt":"2022-07-18T22:58:17","slug":"bdv11-upgrade","status":"publish","type":"page","link":"https:\/\/avitech.com.au\/?page_id=3407","title":{"rendered":"BDV11 Upgrade"},"content":{"rendered":"

This page documents the steps taken to “upgrade” the ROMs in a standard BDV11 in August 2018.<\/p>\n

This BDV11 had only two ROMs in it. They were marked U49 and U54. They were in the locations that I later replaced with 453-1 and 454-1 respectively.<\/p>\n

The original ROMs used to conduct a Memory Test and then give a “Start?” prompt. I did limited testing of these original ROMs, but can confirm the entering DD0 or DL1 at this prompt booted TU58 Unit 0 or RL02 Unit 1 respectively.<\/p>\n

The original 8-way dipswitch setting was (1-8): 11010010
\nThe original 5-way dipswitch setting was (1-5): 00000 on the first board, and 00001 on the second board<\/p>\n

I fitted ROMs 453-1 to 453-4 and 454-1 to 454-4.<\/p>\n

The new dipsw setting were:<\/p>\n

8-way (1-8): 00000011
\n5-way (1-5): 00000<\/p>\n

The conversation worked great. It greeted me with the following:<\/p>\n

KDF11B-BJ ROM V1.1<\/pre>\n
Apart from the change in dipswitch settings, no changes were required to the BDV11 board.<\/p>\n
On some boards, you will see 4 wire links that have been added to Pins BC1-BF1 in the lower-right corner of the PCB. This is to allow the BDV11 to work in a 22-bit backplane. This ECO is documented in the BV!!-A Maintenance Print Set<\/em> (see below for link).<\/p>\n
Resources<\/h4>\n
The best resource for technical information about the BDV11 is the “LSI-11 Systems Service Manual, Volume II”<\/em> at page 425. The DEC Part Number for this manuals is EK-LSIFS-SV-005. I have extracted the BDV11 pages from this manual and they can be downloaded here -> BDV11 extract from LSI-11 System Service Manual<\/a>.  This extract has information about dipswitch settings, LED status indicators, jumper settings, memory map options, and halt addresses. It doesn’t provide the ROM-socket designators, except for the originally fitted ROMs.<\/p>\n
Also useful is the BDV11-A Field Maintenance Print Set<\/a>, DEC Print Set Order No. MP00489.  This has the full circuit diagram, component locations, and other useful information.<\/p>\n
I have previously published a webpage with more details about installing the PDP-11\/23+ (KDF11-B) ROMs in the BDV11. This is useful because it provides many boot boot-device options, as well as an interactive boot menu. Unfortunately this only works with the PDP-11\/23 (M8186) and won’t work with a PSP-11\/03 or PDP-11\/53, though there are some work-arounds (disabling memory tests etc) which apparently increase compatibility with other processors. I haven’t yet experminted with this. This webpage is no longer available online, but is available here on the Wayback Machine<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
This page documents the steps taken to “upgrade” the ROMs in a standard BDV11 in August 2018. This BDV11 had only two ROMs in it. They were marked U49 and U54. They were in the locations that I later replaced with 453-1 and 454-1 respectively. The original ROMs used to conduct a Memory Test and ..<\/p>\n
<\/div>\n
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-3407","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P7xTsk-SX","jetpack-related-posts":[{"id":1664,"url":"https:\/\/avitech.com.au\/?page_id=1664","url_meta":{"origin":3407,"position":0},"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. 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