Programmable controller
AssigneeXerox Corporation
InventorSikander Sheikh
Life of this patent
Estimating the term…
Abstract
An improved programmable controller which includes a non-destructive memory program storage means wherein the controller is programmable by altering the program by substitution of the non-destructive memory storage means. The memory program storage means is comprised of a first memory portion which stores an operation program for the apparatus and a second memory portion which controls the sequence of execution of the operation program. The second memory portion can simultaneously address a location in the first memory portion and a location in an input-output data interface memory.
Claims9
A processor for controlling an apparatus by actuating elements of said apparatus in accordance with a predetermined program and in response to apparatus condition indicators comprising:
- a first non-destructive memory which stores an operational program including a multiplicity of instructions at predetermined locations for control of said apparatus;
- memory control means, including a second non-destructive memory coupled to said first non-destructive memory, for controlling a sequence of execution of program instructions stored in the first memory;
- a buffer memory interface for storing input data to said processor and for storing output data from said processor, said memory control means arranged for simultaneously addressing a memory location in said first memory and at least one location in said buffer memory interface;
- and,
- means for decoding a first memory instruction which is extracted from said first memory and for causing an execution of said first memory instruction as determined by an operation code of said instruction.
Dependencies are inferred from the claim text.