Selection Priority Jumper Arrangement
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-04
A data processing system is connected to input/output devices by means of control units and channels. The control unit selection is controlled by select-out/select-in lines. These lines form a loop from the channel through each control unit and back through the control unit to the channel. The selection priority is wired in the control unit; the priority is high if the control unit is connected on the select-out line. The priority is low if the control unit is attached on the select-in line. In order to prevent the channel adapter driver/receiver card from being removed from the board to have the priority setting changed or checked, an arrangement of a flying connector and jumpers is provided. The top connector of a channel adapter driver receiver (CADR) card is schematically shown in the drawing.