No. 1 ESS call store - A 0.2-megabit ferrite sheet memory

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. T...

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Bibliographic Details
Published in:Bell System Technical Journal 1964-09, Vol.43 (5), p.2147-2191
Main Authors: Genke, R. M., Harding, P. A., Staehler, R. E.
Format: Article
Language:English
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Summary: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.
ISSN:0005-8580
2376-7154
1538-7305
DOI:10.1002/j.1538-7305.1964.tb04122.x