M688 Flip Chip Unibus Power Fail Driver Modules

[steven at malikoff.com]

Noel said
     > The "Spare Module Handbook" lists:
>     > ...
>     > MX11-B
>
> I apparently can't read. Should be "MX15-B":
>
>   https://gunkies.org/wiki/MX15-B_Memory_Multiplexer

Would that be part of this system at a Japanese computer museum? There is an 11/15 and the 11/05 has 'Unichannel15' on it:
https://www.kcg.ac.jp/museum/en/computer/mini_computers/dec.html