Memory protection system

• US 3,264,615 A
• Filed: 12/11/1962
• Issued: 08/02/1966
• Est. Priority Date: 12/11/1962
• Status: Expired due to Term

• Current Assignee: Henry G. Jones, John A De Veer, Richard P. Case, Ronald M. Smith
• Original Assignee: Henry G. Jones, John A De Veer, Richard P. Case, Ronald M. Smith
• Inventors: Case, Richard P., Jones, Henry G., Smith, Ronald M., DE VEER JOHN A
• Application Number:
  US04/243,883
• Time in Patent Office: 1,330 Days
• US Class Current: 711/163
• CPC Class Codes: G06F 12/1441 for a range
• CPC Class Codes: G06F 7/02 Comparing digital values G06F7/06, G06F7/22, G06F7/38 take precedence

Claims

1. IN COMBINATION WITH A MEMORY HAVNG A PLURALITY OF ADDRESSABLE STORAGE LOCATIONS WHICH ARE ASSIGNED ADDRESSES IN AN ORDERED SEQUENCE, SAID ADDRESS BEING EMPLOYED TO OBTAIN ACCESS TO SAID LOCATIONS, MEANS FOR PROTECTING PREDETERMINED LOCATIONS IN SAID MEMORY COMPRISING:

(A) MEANS FOR STORING A CONFIGURATION OF ADDRESS IDENTIFYING INDICIA WHICH IS COMMON TO A PLURALITY OF ADDRESSES IN SAID MEMORY;

(B) MEANS CONTROLLABLE FOR COMPARING AT LEAST A PART OF EACH ADDRESS EMPLOYED TO OBTAIN ACCESS TO A LOCATION IN SAID MEMORY WITH AT LEAST A PART OF THE CONFIGURATION STORED IN SAID REGISTER MEANS;

(C) MEANS FOR SIGNALLING FAVOURABLE OR UNFAVORABLE COMPARASION;

AND (D) MEANS RESPONSIVE TO A PREDETERMINED ONE OF SAID FAVORABLE OR UNFAVORABLE COMPARISON SIGNALS FOR SIGNALLING A VIOLATION OF A PROTECTED ADDRESSABLE LOCATION.