- Alan Kay developed his Flex Machine in the late 1960s while exploring ideas that would later evolve into Smalltalk.
Royal Signals and Radar Establishment (RSRE) developed its Flex Machine in Malvern, Worcestershire, England, during the 1980s. It used a tagged storage scheme to implement a Capability-based security architecture, and was designed for the safe and efficient implementation of strongly-typed procedures.
There were (at least) two incarnations of Flex, implemented using hardware with writable microcode. The first was supplied by Logica to a RSRE design, and the second used an ICL PERQ . The microcode alone was responsible for storage allocation, deallocation and garbage collection. This immediately precluded a whole class of errors arising from the misuse (deliberate or accidental) of pointers.
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