IBM Journal of Research and Development
IBM Skip to main content
  Home     Products & services     Support & downloads     My account  

  Select a country  
Journals Home  
  Systems Journal  
Journal of Research
and Development
    Current Issue  
    Recent Issues  
    Papers in Progress  
    Recent publications  
    Author's Guide  
  Contact Us  
  Related links:  
     IBM Research  

IBM Journal of Research and Development  
Volume 7, Number 4, Page 317 (1963)
Nontopical Issue
  Full article: arrowPDF   arrowCopyright info


Automatic Correction of Multiple Errors Originating in a Computer Memory

by P. R. Daher
An error correction unit has been installed in an IBM RAMAC® 305 to demonstrate automatic correction of burst errors originating in a computer memory. Employing a cyclic code requiring two percent redundancy, the unit has successfully corrected all four-bit and most five-bit error bursts in a 100-character record stored on a defective disk. Details of the error correction unit and test results are presented; two special cases involving block length are also discussed.
Related Subjects: Error correction codes; Error detection and correction