Browse Prior Art Database

Intelligent Input Output Console Switch

IP.com Disclosure Number: IPCOM000085759D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Lilie, MI: AUTHOR [+2]

Abstract

A plurality of requesting units, for example, IBM System/7s are sequentially connected to a single console terminal on a first-come, first-served basis via a controlled switching network. Alternatively, the terminal may request connection to a given requesting unit via the controlled switching network.

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Intelligent Input Output Console Switch

A plurality of requesting units, for example, IBM System/7s are sequentially connected to a single console terminal on a first-come, first-served basis via a controlled switching network. Alternatively, the terminal may request connection to a given requesting unit via the controlled switching network.

A hardware switch 2 presents a copy of the I/O console interface on a console 4 to each of a plurality of computing systems such as the System/7s, 6, 8 and 10. When the console 4 is free and in condition to be selected by any one of the systems, the REMOTE LINE 12 is logically positive to all systems. This allows the MOTOR ON line 14 to be turned on by the selecting system.

The instant MOTOR ON 14 goes positive from a selecting system, the REMOTE 12 then goes negative to all other systems. A message can now be typed from the selecting system on to the console 4. When the message is completed, MOTOR ON from the system goes negative to restore the switch 2 to the original condition.

To facilitate switching, all messages from a system are formatted as to begin with a MOTOR ON command and to end with a MOTOR OFF command. When the switch 2 attaches the console 4 to a selecting system, a different system can have a message for the console 4, but not be able to select it because of the busy condition. In this instance, the system goes into a loop until the REMOTE LINE 12 again goes positive indicating that the first system has relea...