System for accurately informing each of adapters of its packaged location

Abstract

For use in informing each of zeroth through (N-1)-th adapters (N represents a positive integer) of its packaged location from a processor when the processor and the adapters are packaged on a backboard, the processor comprises a signal producer which produces first and second number signals. The first number signal represents an initial integer as a first number. The second number signal represents the initial integer plus an additional integer as a second number. The additional integer is selected from zero to (N-1). The zeroth adapter comprises a detecting circuit, a judging circuit, an adder, and an internal connection line. The detecting circuit detects the first number to produce a detection signal representative of the first number. The judging circuit judges whether or not the detection signal is coincident with the second number signal to produce a coincidence signal when the detection signal is coincident with the second number signal. The coincidence signal represents that the first number represented by the detection signal indicates the packaged location of the zeroth adapter. The adder produces a sum signal representative of a sum of the first number and one and delivers the sum signal to a succeeding adapter which succeeds the zeroth adapter. Supplied with the second number signal, the internal connection line delivers the second number signal to the succeeding adapter as it is. The succeeding adapter is similar in structure and in operation to the zeroth adapter.