Abstract: A computer peripheral device incorporating a multi-task control device which is extremely useful for such programs controlling the microcomputer system. In particular, the multi-task control device effectively controls a plurality of tasks executed by the CPU by using means other than the CPU including such means for controlling operations needed for comparing priority orders between a plurality of tasks, and the other means for generating interrupt operations from this control device against the CPU needed for switching tasks being executed in accordance with the result of the priority comparative operations.

Abstract: In a microcomputer system, having independently programmed tasks and a master control processing unit (CPU), tasks can be switched independent of the master CPU through the use of a multi-task support processor which may, for example, be connected to the microcomputer system via an input/output (I/O) port. The multi-task support processor includes a memory for storing task control programs, a data memory and task control memory, a timer, a controller for controlling multi-task operations, and a master CPU interface element. Tasks including task control commands are stored in a memory for execution by the master CPU. The master CPU, upon encountering a task control command, sends that command to the multi-task support processor which becomes activated to control the switching and communications between the tasks under the direction of the received task control command, so that tasking control may be performed independent of the master CPU.