Control Unit With Means for Automatically Switching the Connections of Select in and Select Out for Controlling Priority Sequence
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
A control unit of a data processing system has a semiconductor switch system that connects the selection circuit between either of two pairs of selection ports and makes a direct connection between the other pair. The apparatus is similar to the semiconductor switches that are used for bypassing the selection circuit in case the control unit is to be disconnected from the system. Maintenance personnel electronically signal the control unit to connect the selection circuits and the jumper connection between the ports in a selected configuration. Alternatively, the processor computes a priority sequence for the control units and signals each unit to make the corresponding connections to the selection ports.