The Microram was a multipurpose solid state memory chassis sold by EMM (Electronic
Memories and Magnetics) with what we called later in the 1970's a "personality
board" that plugged it into each different CPU's backplane. They sold a similar
system (maybe even plug compatible at some level) with core planes under
"Micromemory" brand name. I see we already have a "emm" directory in
bitsavers with docs about some of their core products.