Memory protection system providing fixed, conditional and free memory portions corresponding to ranges of memory address numbers

摘要: A method and apparatus for flexible protection against overwriting destruction of the contents selected portions a computer memory device formed multiplicity units. Each unit is assigned unique address number which serves to identify in instructions write data into memory. The numbers are segregated ranges defining separate be protected, with at limits or boundaries being entered registers can reset flexibly determine protected ranges. separated this fashion three different portions: one permitting free writing access units, withholding all conditioned grant withhold according setting such as flip-flop arranged manual programable control. Whenever an instruction alter arises, associated register compared by means digital comparators range boundary their registers. Gate accordance comparison, thereby controlling insertion each providing device.