INFORMATION PROCESSOR

摘要

PURPOSE:To expand the development of a program and the supporting function of a test and to provide a function supporting the performance evaluation by trapping a specified I/O device only when the number of accesses of a specific instruction to the specified I/O device exceeds the specified number of times. CONSTITUTION:The I/O device number of an I/O device to be trapped is set up in a trap register TR through an input line I2. The upper limit value of the number of accesses is set up in a counter CNT through an input line I1. In the process of successive execution of a program by a central processor, information for distinguishing the I/O device is entered to an I/O address register through an input line I3. When the contents of the trap register TR coincide with the contents of the trap register TR coincide with the contents of the I/O address register, the counter CNT is subtracted one by one. When the contents of the counter CNT is turned to ''0'', an interruption factor flip flop is turned on and a gate GT is closed.