A Dimond ring or Dimond ring translator was an early type of computer read-only memory, created in the early 1940s by T. L. Dimond at Bell Laboratories for Bell's #5 Crossbar Switch, a type of early telephone switch.R. J. Chapuis and A. E. Joel Jr., 100 Years of Telephone Switching, part 2: Electronics, Computers and Telephone Switching (2nd. edition), p. 33, IOS Press 2003.
Structure
Large-diameter magnetic ferrite toroidal rings with solenoid windings, through which are threaded writing and reading wires.
Uses It was used in the #5 Crossbar Switch and TXE (prior to TXE4A) telephone exchanges.
See also Core rope memory, a later development
References