MM11-L core memory
From Computer History Wiki
The MM11-L was a popular, and common, memory for the early PDP-11 UNIBUS machines. An MM11-L was composed of a three board set:
- G110 - hex-format memory control logic and data channels
- G231 - hex-format memory driver logic
- H214 - quad-format core stack
There was also a parity variant, the MM11-LP, which added an M7259 - dual parity controller.
The MM11-L required a custom backplane, although some CPU's (e.g. the PDP-11/05) had processor backplanes wired for one MM11-L set.
The MM11-S was a four-slot backplane plus a single MM11-L board set. The MF11-L was a nine-slot backplane plus a single MM11-L board set; the backplane has room for two more MM11-L board sets. The ME11-L is an MF11-L in a 5-1/4" rack-mount box, with power supply.
Parity versions (with a 'P' suffix) were available for all of the above.
