> > > > > So I decided to insert two 32K core memory backplanes > > 32KW, those would be MM11-U backplanes, right? >
Here is a closeup. I have have related docs. http://vintagecomputer.net/digital/pdp11-40/32Kx16-MemoryBackplane_5010344C_label.jpg > > > My plan is to replace the solid-state RAM card with core, and this > will > > free up a slot on the 4-slot backplane for a terminator. > > Terminators all only go in the last slot of the last backplane anyway > (either > that, or a UNIBUS 'out' cable), so adding extra backplanes shouldn't give > you > "a slot .. for a terminator". > > Thanks for clarifying. > Also, Paul's point is a good one: the hex memory cards need so-called 'MUD > slots' (hex), not SPC slots (quad), and only (IIRC) the DD11-C/D have MUD > slots. (Those came in with the 11/04-34, IIRC). > > It is 3011-cf / 70-12445 1979 > > the serial card seems to have stopped working. It appears that the > > console program is being loaded and runs from the M9312 but nothing > is > > appearing on the terminal. I cannot send an "A" to the terminal, the > > most basic test I can think of. > > Hmm. You can read/write the console registers from the console, though, it > sounds like? My guess would be that if your serial port is EIA, somehow > you're missing -15V or something on the DD11 in its new location. Study the > -11/35-40 system manual to learn about which 'bricks' supply which voltages > to which system units. > > OK, but will always watch this. > And while you're at it, check that you have the right 'bricks' for the > MM11-U. > The -11/35-40 system manual has lots of text on how to support the MM11-U. > > > Can you only use the core backplanes for core memory (assume yes), or > > are they capable of holding other types of cards temporarily? > > > AFAICR, the MM11-U backplane does _not_ have an SPC slot in it. IIRC, the > 16KW MM11-U board set is a quad controller board, and 3 hex boards (core, > X-Y > and something else). So two sets (the backplane holds two) would be 8, so > one > empty slot - which IIRC is blank. Check the MM11-U manual, it's available. > > Came with M7891 RAM installed in the 3011-cf backplane. > > I have one slot that needs the npg, it's in place. > > ??? _Every_ SPC/MUD slot which does not have a DMA device in it _must_ have > the jumper on the backplane (or the _double_ width UNIBUS grant card, whose > number escapes my memory, which contains a NPG jumper). Not sure if that > was the import of what you wrote there. > > Note - System came to me as thus, after the CPU, the 3011-cf backplane had the following: UNIBUS 10 A-B (LEFT SIDE OF UNIBUS) M7856 10 F-C (RS232 WITH 19.2 OPTION?) G7273 11 C-D 7891 12 A-F (64k MEMORY) M9312 13 A-B (ROM CARD) 672A 13 D (GRANT CONT.) I am going to switch to another backplane and start over. Don't know what I am doing yet to be honest. I have to read the manuals and get better educated to properly get these parts working together correctly. Bill -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
