A call store is an 8,193-word, 24-bit per word memory system using multi-aperture ferrite sheets in a destructive-readout, coincident-current configuration and operating in a 5.5-microsecond read-write cycle. It is designed for 40-year life and operation in ambient temperatures from 32°F to 115°F. The paper describes in detail the memory medium and memory circuits. General description is given of call store usage on the common bus in the no. 1 ESS and the maintenance and diagnostic features provided. Finally, a discussion of testing and test pattern philosophy is included, along with results measured on production stores.
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Genke et al. (1964) studied this question.
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