Two Technologies were considered : a SUHL Sylvania technology used in the GE600 and a CML (Current Mode Logic) technology developed in GE laboratories. Eventually, the CML was chosen as the base of the study, probably due to an intense lobbying of research people in front of managers who remained technically minded.
Although the level of integration of CML was at that time extremely embryonic, that technology was chosen for its performances and its low consumption.
Main memory was assumed initially to be magnetic core in spite of its labor intensive cost figures: at that time, GE was planning to set up a core weaving factory ...in the Navajo reservation! You should note that the intended manufacturing cost of what became Level64 CPU later was planned to be 8,900 1970 dollars, while memory was expected to be 8,000 dollars per 32K Bytes!
The R370 CPU was to be developed in Paris - under the direction of Jacques BIENVENU; it had to be based on hardware blocks, planned to be common to all the components of L-178, called SOMA (System Oriented Macro Assembly). Those SOMA were envisioned to be eventually LSIfied in a future version