METHOD AND DEVICE FOR CALLING VIRTUAL INSTRUCTION

PROBLEM TO BE SOLVED: To freely change bit strings meaning instructions of a CPU and to execute subroutine call with only hardware. SOLUTION: Relations between bit strings for realizing instructions stored in a storage device of an information processor and instructions in the information processor which are generated on the basis of the bit strings by an instruction decoder in the information processor are defined in an associative memory realized with hardware and an instruction relation table constituted of a memory, and relations between the bit strings representative of instructions and the internal instructions are changed in the instruction relation table.