Browse Prior Art Database

Selection Priority Jumper Arrangement

IP.com Disclosure Number: IPCOM000042511D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Billian, A: AUTHOR

Abstract

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.

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Selection Priority Jumper Arrangement

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. The select-out and select-in lines are connected to the card through this connector. Depending upon the arrangement of jumpers on the flying connector, the control unit can be connected with a high priority or a low priority, or it can be bypassed. Thus, it is not necessary to unplug the CADR card to know the control unit priority or to change the priority assignment.

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