Core

n. Main storage or RAM. Dates from the days of ferrite-core memory; now archaic as techspeak most places outside IBM, but also still used in the UNIX community and by old-time hackers or those who would sound like them. Some derived idioms are quite current; 'in core', for example, means 'in memory' (as opposed to 'on disk'), and both {core dump} and the 'core image' or 'core file' produced by one are terms in favor. Commonwealth hackish prefers store.