On Mon, Sep 17, 2018 at 1:30 PM, Henk Gooijen via cctalk < cctalk@classiccmp.org> wrote:
> As far as I know, the 11/40 uses only one H745. > And vague memory seems te recall that the -15V brick is an “odd one”, > because, unlike all other bricks, it needs the +15V from the regulator that > is inside the H742 block. But I could be wrong ... > The D and E position regulators in the H742 of an 11/40 can be: * both H745, if no MM11-U core memory is used * one H745 in D and one H754 in E, if some core memory is used * no H745, and two H754 in D and E, if a lot of core memory is used The A, B, and C position are always H744 (+5V 25A). I'm not clear on the distinction between "some" and "a lot" of MM11-U core memory. It might be explained in the 11/40 manual, or one might have to work it out from which memory backplanes are powered from which regulator modules.