1008 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1956 



Fig. 18 — Magnetic core array (Courtesy of IBM). 



One way in which electronic memory for various system applications 

 may be evaluated is given by the chart of Fig. 22. This chart attempts to 

 show, for the various forms of storage, the relation between the ca- 

 pacity in bits and cycle time, which includes access, reading and, if 

 necessary, the regeneration time of the stored information. For sake of 

 simplicity, ferroelectric and magnetic core memories have been com- 

 bined as coordinate access arrays. Single bit electronic memory will be 

 described in more detail later. 



