×

Method of assuring integrity of information being stored

  • US 5,138,548 A
  • Filed: 01/03/1990
  • Issued: 08/11/1992
  • Est. Priority Date: 07/11/1987
  • Status: Expired due to Fees
First Claim
Patent Images

1. Method for assuring integrity of information being stored in a control device having:

  • at least one microprocessor (4),at least one permanently programmed memory (ROM

         7) for storage of control programs, andat least one freely programmable and reprogrammable read memory (EPROM

         6) having a plurality of memory locations,comprising the steps ofstoring in said read memory (6) information including an address pointer which begins at a fixed start address, said address pointer referencing addresses of at least one of the following types of information;

    data,fields, andconstants, which are stored together with the address pointer in the read memory (6), andupdating said information by at least partially replacing previously stored information by current information of the same type(s) as that previously stored wherein loss of previously stored data by faulty overwriting is avoided by first identifying free memory locations and subsequently writing said current information only into free memory locations which contain no previously stored information.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×