I'll check my system tomorrow if I can. If you are using a DEC MS11-LB or LD or compatible, you will need a DD11CK or DK backplane. If used in a BA11-BF, you will Need DD11-CF or DF, which is the same as the CK/DK, but with a longer wiring harness.
DEC made an "extension cable" to do this, but thew are not many around. Or just replace it yourself. Paul On Tue, Sep 18, 2018 at 3:11 AM, P Gebhardt via cctalk < cctalk@classiccmp.org> wrote: > > > From: Henk Gooijen > > > > > As far as I know, the 11/40 uses only one H745. > > > >Depends on what kind of memory it has. If MF11-L, it has two H745's; if > >MM11-U, it has an H745 and an H754. > > > >(The harness has two different connectors for the 5th 'brick', so it can > >handle either kind. At least, that's the situation on the later machines > >[serial numbers above 6000]; early production /40's only support the > MF11-L, > >and you have to use special add-on harnesses to support an MF11-U in them; > >see DEC-11-H40SA-B-D, Chapter 6 for the details.) > > As I don't have core memory modules available, I thought of using MS11 > memory, > which, according to my research, seems to be an option for 11/40 systems. > The system manual states on page 6-7 that the base power configuration > consists > of two H745 regulators and that one may be swapped with a H754 in case > MF11-U > memory is used. > Does that mean that a single H745 regulator might be sufficient for my > needs? > > All the best, > Pierre >
