MM11-Y core memory
The MM11-Y was a 64 Kbyte core main memory for PDP-11 UNIBUS machines. An MM11-Y was composed of two hex boards, one piggy-backed on the other, and the pair taking only a single backplane slot (electrically):
- An H228-B daughter-board containing the cores
- A G657 mother-board containing most of the electronics, and the contact fingers for plugging into a backplane
The MM11-Y did not use a custom backplane; it plugged into a standard MUD slot. The pair was 'thick' enough that a normal board cannot be plugged into the next slot; instead, a G727 grant continuity card must be used there (since it has no components on it, it just clears the H228-B card).
It provided parity, so technically its name was MM11-DP; it used an M7850 parity controller plugged into the same backplane as the MM11-D. The core array provided two more bits per word, to support byte parity..
- MM11-YP User's Manual (EK-MM1YP-UG) - not available online
- MM11-YP Technical Manual (EK-MM1YP-TM-001) - not available online, exists in fiche
|v • d • e PDP-11 Computers and Peripherals|
|UNIBUS PDP-11s - PDP-11/20 • PDP-11/15 • PDP-11/35 • PDP-11/40 • PDP-11/45 • PDP-11/50 • PDP-11/55 • PDP-11/70 • PDP-11/05 • PDP-11/10 • PDP-11/34 • PDP-11/04 • PDP-11/44 • PDP-11/60 • PDP-11/24 • PDP-11/84 • PDP-11/94|