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MM11 refers to a number of different core main memory systems for UNIBUS PDP-11s:

The first through fourth were multi-board systems which plugged into a custom backplane which was cabled into the UNIBUS. Some PDP-11/05 CPU backplanes could hold board sets of the later ones. The MM11-U board set was also used in the MJ11 memory system for the PDP-11/70's Main Memory Bus. The last ones plugged into a Modified UNIBUS slot.

See also

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