A call store is an 8,192‐word, 24‐bit per word memory system using multiaperture 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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